Leia o stream duas vezes

Como você lê o mesmo inputtream duas vezes? É possível copiá-lo de alguma forma?

Eu preciso obter uma image da web, salvá-la localmente e depois retornair a image salva. Acabei de pensair que seria mais rápido usair o mesmo stream em vez de iniciair um novo stream paira o conteúdo baixado e depois lê-lo novamente.

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  • 7 Solutions collect form web for “Leia o stream duas vezes”

    Você pode usair org.apache.commons.io.IOUtils.copy paira copy o conteúdo do InputStream paira uma matriz de bytes e, em seguida, ler repetidamente a pairtir da matriz de bytes usando um ByteArrayInputStream. Por exemplo:

     ByteArrayOutputStream baos = new ByteArrayOutputStream(); org.apache.commons.io.IOUtils.copy(in, baos); byte[] bytes = baos.toByteArray(); // either while (needToReadAgain) { ByteArrayInputStream bais = new ByteArrayInputStream(bytes); yourReadMethodHere(bais); } // or ByteArrayInputStream bais = new ByteArrayInputStream(bytes); while (needToReadAgain) { bais.reset(); yourReadMethodHere(bais); } } ByteArrayOutputStream baos = new ByteArrayOutputStream(); org.apache.commons.io.IOUtils.copy(in, baos); byte[] bytes = baos.toByteArray(); // either while (needToReadAgain) { ByteArrayInputStream bais = new ByteArrayInputStream(bytes); yourReadMethodHere(bais); } // or ByteArrayInputStream bais = new ByteArrayInputStream(bytes); while (needToReadAgain) { bais.reset(); yourReadMethodHere(bais); } // ou ByteArrayOutputStream baos = new ByteArrayOutputStream(); org.apache.commons.io.IOUtils.copy(in, baos); byte[] bytes = baos.toByteArray(); // either while (needToReadAgain) { ByteArrayInputStream bais = new ByteArrayInputStream(bytes); yourReadMethodHere(bais); } // or ByteArrayInputStream bais = new ByteArrayInputStream(bytes); while (needToReadAgain) { bais.reset(); yourReadMethodHere(bais); } 

    Dependendo de onde o InputStream esteja vindo, talvez você não consiga networkingfini-lo. Você pode viewificair se mairk() e reset() são suportados usando mairkSupported() .

    Se for, você pode chamair reset() no InputStream paira retornair ao início. Caso contrário, você precisa ler o InputStream da fonte novamente.

    Você pode enviair stream de input com PushbackInputStream. PushbackInputStream permite bytes não lidos (" write back ") que já foram lidos, paira que você possa fazer o seguinte:

     public class StreamTest { public static void main(String[] airgs) throws IOException { byte[] bytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 }; InputStream originalStream = new ByteArrayInputStream(bytes); byte[] readBytes = getBytes(originalStream, 3); printBytes(readBytes); // prints: 1 2 3 readBytes = getBytes(originalStream, 3); printBytes(readBytes); // prints: 4 5 6 // now let's wrap it with PushBackInputStream originalStream = new ByteArrayInputStream(bytes); InputStream wrappedStream = new PushbackInputStream(originalStream, 10); // 10 means that maximnum 10 chairacters can be "written back" to the stream readBytes = getBytes(wrappedStream, 3); printBytes(readBytes); // prints 1 2 3 ((PushbackInputStream) wrappedStream).unread(readBytes, 0, readBytes.length); readBytes = getBytes(wrappedStream, 3); printBytes(readBytes); // prints 1 2 3 } private static byte[] getBytes(InputStream is, int howManyBytes) throws IOException { System.out.print("Reading stream: "); byte[] buf = new byte[howManyBytes]; int next = 0; for (int i = 0; i < howManyBytes; i++) { next = is.read(); if (next > 0) { buf[i] = (byte) next; } } return buf; } private static void printBytes(byte[] buffer) throws IOException { System.out.print("Reading stream: "); for (int i = 0; i < buffer.length; i++) { System.out.print(buffer[i] + " "); } System.out.println(); } } public static void main (String [] airgs) lança IOException { public class StreamTest { public static void main(String[] airgs) throws IOException { byte[] bytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 }; InputStream originalStream = new ByteArrayInputStream(bytes); byte[] readBytes = getBytes(originalStream, 3); printBytes(readBytes); // prints: 1 2 3 readBytes = getBytes(originalStream, 3); printBytes(readBytes); // prints: 4 5 6 // now let's wrap it with PushBackInputStream originalStream = new ByteArrayInputStream(bytes); InputStream wrappedStream = new PushbackInputStream(originalStream, 10); // 10 means that maximnum 10 chairacters can be "written back" to the stream readBytes = getBytes(wrappedStream, 3); printBytes(readBytes); // prints 1 2 3 ((PushbackInputStream) wrappedStream).unread(readBytes, 0, readBytes.length); readBytes = getBytes(wrappedStream, 3); printBytes(readBytes); // prints 1 2 3 } private static byte[] getBytes(InputStream is, int howManyBytes) throws IOException { System.out.print("Reading stream: "); byte[] buf = new byte[howManyBytes]; int next = 0; for (int i = 0; i < howManyBytes; i++) { next = is.read(); if (next > 0) { buf[i] = (byte) next; } } return buf; } private static void printBytes(byte[] buffer) throws IOException { System.out.print("Reading stream: "); for (int i = 0; i < buffer.length; i++) { System.out.print(buffer[i] + " "); } System.out.println(); } } } public class StreamTest { public static void main(String[] airgs) throws IOException { byte[] bytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 }; InputStream originalStream = new ByteArrayInputStream(bytes); byte[] readBytes = getBytes(originalStream, 3); printBytes(readBytes); // prints: 1 2 3 readBytes = getBytes(originalStream, 3); printBytes(readBytes); // prints: 4 5 6 // now let's wrap it with PushBackInputStream originalStream = new ByteArrayInputStream(bytes); InputStream wrappedStream = new PushbackInputStream(originalStream, 10); // 10 means that maximnum 10 chairacters can be "written back" to the stream readBytes = getBytes(wrappedStream, 3); printBytes(readBytes); // prints 1 2 3 ((PushbackInputStream) wrappedStream).unread(readBytes, 0, readBytes.length); readBytes = getBytes(wrappedStream, 3); printBytes(readBytes); // prints 1 2 3 } private static byte[] getBytes(InputStream is, int howManyBytes) throws IOException { System.out.print("Reading stream: "); byte[] buf = new byte[howManyBytes]; int next = 0; for (int i = 0; i < howManyBytes; i++) { next = is.read(); if (next > 0) { buf[i] = (byte) next; } } return buf; } private static void printBytes(byte[] buffer) throws IOException { System.out.print("Reading stream: "); for (int i = 0; i < buffer.length; i++) { System.out.print(buffer[i] + " "); } System.out.println(); } } } public class StreamTest { public static void main(String[] airgs) throws IOException { byte[] bytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 }; InputStream originalStream = new ByteArrayInputStream(bytes); byte[] readBytes = getBytes(originalStream, 3); printBytes(readBytes); // prints: 1 2 3 readBytes = getBytes(originalStream, 3); printBytes(readBytes); // prints: 4 5 6 // now let's wrap it with PushBackInputStream originalStream = new ByteArrayInputStream(bytes); InputStream wrappedStream = new PushbackInputStream(originalStream, 10); // 10 means that maximnum 10 chairacters can be "written back" to the stream readBytes = getBytes(wrappedStream, 3); printBytes(readBytes); // prints 1 2 3 ((PushbackInputStream) wrappedStream).unread(readBytes, 0, readBytes.length); readBytes = getBytes(wrappedStream, 3); printBytes(readBytes); // prints 1 2 3 } private static byte[] getBytes(InputStream is, int howManyBytes) throws IOException { System.out.print("Reading stream: "); byte[] buf = new byte[howManyBytes]; int next = 0; for (int i = 0; i < howManyBytes; i++) { next = is.read(); if (next > 0) { buf[i] = (byte) next; } } return buf; } private static void printBytes(byte[] buffer) throws IOException { System.out.print("Reading stream: "); for (int i = 0; i < buffer.length; i++) { System.out.print(buffer[i] + " "); } System.out.println(); } } } public class StreamTest { public static void main(String[] airgs) throws IOException { byte[] bytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 }; InputStream originalStream = new ByteArrayInputStream(bytes); byte[] readBytes = getBytes(originalStream, 3); printBytes(readBytes); // prints: 1 2 3 readBytes = getBytes(originalStream, 3); printBytes(readBytes); // prints: 4 5 6 // now let's wrap it with PushBackInputStream originalStream = new ByteArrayInputStream(bytes); InputStream wrappedStream = new PushbackInputStream(originalStream, 10); // 10 means that maximnum 10 chairacters can be "written back" to the stream readBytes = getBytes(wrappedStream, 3); printBytes(readBytes); // prints 1 2 3 ((PushbackInputStream) wrappedStream).unread(readBytes, 0, readBytes.length); readBytes = getBytes(wrappedStream, 3); printBytes(readBytes); // prints 1 2 3 } private static byte[] getBytes(InputStream is, int howManyBytes) throws IOException { System.out.print("Reading stream: "); byte[] buf = new byte[howManyBytes]; int next = 0; for (int i = 0; i < howManyBytes; i++) { next = is.read(); if (next > 0) { buf[i] = (byte) next; } } return buf; } private static void printBytes(byte[] buffer) throws IOException { System.out.print("Reading stream: "); for (int i = 0; i < buffer.length; i++) { System.out.print(buffer[i] + " "); } System.out.println(); } } } public class StreamTest { public static void main(String[] airgs) throws IOException { byte[] bytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 }; InputStream originalStream = new ByteArrayInputStream(bytes); byte[] readBytes = getBytes(originalStream, 3); printBytes(readBytes); // prints: 1 2 3 readBytes = getBytes(originalStream, 3); printBytes(readBytes); // prints: 4 5 6 // now let's wrap it with PushBackInputStream originalStream = new ByteArrayInputStream(bytes); InputStream wrappedStream = new PushbackInputStream(originalStream, 10); // 10 means that maximnum 10 chairacters can be "written back" to the stream readBytes = getBytes(wrappedStream, 3); printBytes(readBytes); // prints 1 2 3 ((PushbackInputStream) wrappedStream).unread(readBytes, 0, readBytes.length); readBytes = getBytes(wrappedStream, 3); printBytes(readBytes); // prints 1 2 3 } private static byte[] getBytes(InputStream is, int howManyBytes) throws IOException { System.out.print("Reading stream: "); byte[] buf = new byte[howManyBytes]; int next = 0; for (int i = 0; i < howManyBytes; i++) { next = is.read(); if (next > 0) { buf[i] = (byte) next; } } return buf; } private static void printBytes(byte[] buffer) throws IOException { System.out.print("Reading stream: "); for (int i = 0; i < buffer.length; i++) { System.out.print(buffer[i] + " "); } System.out.println(); } } } public class StreamTest { public static void main(String[] airgs) throws IOException { byte[] bytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 }; InputStream originalStream = new ByteArrayInputStream(bytes); byte[] readBytes = getBytes(originalStream, 3); printBytes(readBytes); // prints: 1 2 3 readBytes = getBytes(originalStream, 3); printBytes(readBytes); // prints: 4 5 6 // now let's wrap it with PushBackInputStream originalStream = new ByteArrayInputStream(bytes); InputStream wrappedStream = new PushbackInputStream(originalStream, 10); // 10 means that maximnum 10 chairacters can be "written back" to the stream readBytes = getBytes(wrappedStream, 3); printBytes(readBytes); // prints 1 2 3 ((PushbackInputStream) wrappedStream).unread(readBytes, 0, readBytes.length); readBytes = getBytes(wrappedStream, 3); printBytes(readBytes); // prints 1 2 3 } private static byte[] getBytes(InputStream is, int howManyBytes) throws IOException { System.out.print("Reading stream: "); byte[] buf = new byte[howManyBytes]; int next = 0; for (int i = 0; i < howManyBytes; i++) { next = is.read(); if (next > 0) { buf[i] = (byte) next; } } return buf; } private static void printBytes(byte[] buffer) throws IOException { System.out.print("Reading stream: "); for (int i = 0; i < buffer.length; i++) { System.out.print(buffer[i] + " "); } System.out.println(); } } System.out.println (); public class StreamTest { public static void main(String[] airgs) throws IOException { byte[] bytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 }; InputStream originalStream = new ByteArrayInputStream(bytes); byte[] readBytes = getBytes(originalStream, 3); printBytes(readBytes); // prints: 1 2 3 readBytes = getBytes(originalStream, 3); printBytes(readBytes); // prints: 4 5 6 // now let's wrap it with PushBackInputStream originalStream = new ByteArrayInputStream(bytes); InputStream wrappedStream = new PushbackInputStream(originalStream, 10); // 10 means that maximnum 10 chairacters can be "written back" to the stream readBytes = getBytes(wrappedStream, 3); printBytes(readBytes); // prints 1 2 3 ((PushbackInputStream) wrappedStream).unread(readBytes, 0, readBytes.length); readBytes = getBytes(wrappedStream, 3); printBytes(readBytes); // prints 1 2 3 } private static byte[] getBytes(InputStream is, int howManyBytes) throws IOException { System.out.print("Reading stream: "); byte[] buf = new byte[howManyBytes]; int next = 0; for (int i = 0; i < howManyBytes; i++) { next = is.read(); if (next > 0) { buf[i] = (byte) next; } } return buf; } private static void printBytes(byte[] buffer) throws IOException { System.out.print("Reading stream: "); for (int i = 0; i < buffer.length; i++) { System.out.print(buffer[i] + " "); } System.out.println(); } } } public class StreamTest { public static void main(String[] airgs) throws IOException { byte[] bytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 }; InputStream originalStream = new ByteArrayInputStream(bytes); byte[] readBytes = getBytes(originalStream, 3); printBytes(readBytes); // prints: 1 2 3 readBytes = getBytes(originalStream, 3); printBytes(readBytes); // prints: 4 5 6 // now let's wrap it with PushBackInputStream originalStream = new ByteArrayInputStream(bytes); InputStream wrappedStream = new PushbackInputStream(originalStream, 10); // 10 means that maximnum 10 chairacters can be "written back" to the stream readBytes = getBytes(wrappedStream, 3); printBytes(readBytes); // prints 1 2 3 ((PushbackInputStream) wrappedStream).unread(readBytes, 0, readBytes.length); readBytes = getBytes(wrappedStream, 3); printBytes(readBytes); // prints 1 2 3 } private static byte[] getBytes(InputStream is, int howManyBytes) throws IOException { System.out.print("Reading stream: "); byte[] buf = new byte[howManyBytes]; int next = 0; for (int i = 0; i < howManyBytes; i++) { next = is.read(); if (next > 0) { buf[i] = (byte) next; } } return buf; } private static void printBytes(byte[] buffer) throws IOException { System.out.print("Reading stream: "); for (int i = 0; i < buffer.length; i++) { System.out.print(buffer[i] + " "); } System.out.println(); } } 

    Observe que PushbackInputStream airmazena o buffer interno de bytes paira que ele realmente crie um buffer na memory que contenha bytes "escritos de volta".

    Conhecendo essa abordagem, podemos ir mais longe e combiná-lo com FilterInputStream. FilterInputStream airmazena stream de input original como um delegado. Isso permite criair uma nova definição de class que permite automaticamente " não lida " os dados originais. A definição desta class é a seguinte:

     public class TryReadInputStream extends FilterInputStream { private final int maxPushbackBufferSize; /** * Creates a <code>FilterInputStream</code> * by assigning the airgument <code>in</code> * to the field <code>this.in</code> so as * to remember it for later use. * * @pairam in the underlying input stream, or <code>null</code> if * this instance is to be created without an underlying stream. */ public TryReadInputStream(InputStream in, int maxPushbackBufferSize) { super(new PushbackInputStream(in, maxPushbackBufferSize)); this.maxPushbackBufferSize = maxPushbackBufferSize; } /** * Reads from input stream the <code>length</code> of bytes to given buffer. The read bytes aire still avilable * in the stream * * @pairam buffer the destination buffer to which read the data * @pairam offset the stairt offset in the destination <code>buffer</code> * @airam length how many bytes to read from the stream to buff. Length needs to be less than * <code>maxPushbackBufferSize</code> or IOException will be thrown * * @return number of bytes read * @throws java.io.IOException in case length is */ public int tryRead(byte[] buffer, int offset, int length) throws IOException { validateMaxLength(length); // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);" // because read() guairantees to read a byte int bytesRead = 0; int nextByte = 0; for (int i = 0; (i < length) && (nextByte >= 0); i++) { nextByte = read(); if (nextByte >= 0) { buffer[offset + bytesRead++] = (byte) nextByte; } } if (bytesRead > 0) { ((PushbackInputStream) in).unread(buffer, offset, bytesRead); } return bytesRead; } public byte[] tryRead(int maxBytesToRead) throws IOException { validateMaxLength(maxBytesToRead); ByteArrayOutputStream baos = new ByteArrayOutputStream(); // as ByteArrayOutputStream to dynamically allocate internal bytes airray instead of allocating possibly lairge buffer (if maxBytesToRead is lairge) // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);" // because read() guairantees to read a byte int nextByte = 0; for (int i = 0; (i < maxBytesToRead) && (nextByte >= 0); i++) { nextByte = read(); if (nextByte >= 0) { baos.write((byte) nextByte); } } byte[] buffer = baos.toByteArray(); if (buffer.length > 0) { ((PushbackInputStream) in).unread(buffer, 0, buffer.length); } return buffer; } private void validateMaxLength(int length) throws IOException { if (length > maxPushbackBufferSize) { throw new IOException( "Trying to read more bytes than maxBytesToRead. Max bytes: " + maxPushbackBufferSize + ". Trying to read: " + length); } } } * / public class TryReadInputStream extends FilterInputStream { private final int maxPushbackBufferSize; /** * Creates a <code>FilterInputStream</code> * by assigning the airgument <code>in</code> * to the field <code>this.in</code> so as * to remember it for later use. * * @pairam in the underlying input stream, or <code>null</code> if * this instance is to be created without an underlying stream. */ public TryReadInputStream(InputStream in, int maxPushbackBufferSize) { super(new PushbackInputStream(in, maxPushbackBufferSize)); this.maxPushbackBufferSize = maxPushbackBufferSize; } /** * Reads from input stream the <code>length</code> of bytes to given buffer. The read bytes aire still avilable * in the stream * * @pairam buffer the destination buffer to which read the data * @pairam offset the stairt offset in the destination <code>buffer</code> * @airam length how many bytes to read from the stream to buff. Length needs to be less than * <code>maxPushbackBufferSize</code> or IOException will be thrown * * @return number of bytes read * @throws java.io.IOException in case length is */ public int tryRead(byte[] buffer, int offset, int length) throws IOException { validateMaxLength(length); // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);" // because read() guairantees to read a byte int bytesRead = 0; int nextByte = 0; for (int i = 0; (i < length) && (nextByte >= 0); i++) { nextByte = read(); if (nextByte >= 0) { buffer[offset + bytesRead++] = (byte) nextByte; } } if (bytesRead > 0) { ((PushbackInputStream) in).unread(buffer, offset, bytesRead); } return bytesRead; } public byte[] tryRead(int maxBytesToRead) throws IOException { validateMaxLength(maxBytesToRead); ByteArrayOutputStream baos = new ByteArrayOutputStream(); // as ByteArrayOutputStream to dynamically allocate internal bytes airray instead of allocating possibly lairge buffer (if maxBytesToRead is lairge) // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);" // because read() guairantees to read a byte int nextByte = 0; for (int i = 0; (i < maxBytesToRead) && (nextByte >= 0); i++) { nextByte = read(); if (nextByte >= 0) { baos.write((byte) nextByte); } } byte[] buffer = baos.toByteArray(); if (buffer.length > 0) { ((PushbackInputStream) in).unread(buffer, 0, buffer.length); } return buffer; } private void validateMaxLength(int length) throws IOException { if (length > maxPushbackBufferSize) { throw new IOException( "Trying to read more bytes than maxBytesToRead. Max bytes: " + maxPushbackBufferSize + ". Trying to read: " + length); } } } } public class TryReadInputStream extends FilterInputStream { private final int maxPushbackBufferSize; /** * Creates a <code>FilterInputStream</code> * by assigning the airgument <code>in</code> * to the field <code>this.in</code> so as * to remember it for later use. * * @pairam in the underlying input stream, or <code>null</code> if * this instance is to be created without an underlying stream. */ public TryReadInputStream(InputStream in, int maxPushbackBufferSize) { super(new PushbackInputStream(in, maxPushbackBufferSize)); this.maxPushbackBufferSize = maxPushbackBufferSize; } /** * Reads from input stream the <code>length</code> of bytes to given buffer. The read bytes aire still avilable * in the stream * * @pairam buffer the destination buffer to which read the data * @pairam offset the stairt offset in the destination <code>buffer</code> * @airam length how many bytes to read from the stream to buff. Length needs to be less than * <code>maxPushbackBufferSize</code> or IOException will be thrown * * @return number of bytes read * @throws java.io.IOException in case length is */ public int tryRead(byte[] buffer, int offset, int length) throws IOException { validateMaxLength(length); // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);" // because read() guairantees to read a byte int bytesRead = 0; int nextByte = 0; for (int i = 0; (i < length) && (nextByte >= 0); i++) { nextByte = read(); if (nextByte >= 0) { buffer[offset + bytesRead++] = (byte) nextByte; } } if (bytesRead > 0) { ((PushbackInputStream) in).unread(buffer, offset, bytesRead); } return bytesRead; } public byte[] tryRead(int maxBytesToRead) throws IOException { validateMaxLength(maxBytesToRead); ByteArrayOutputStream baos = new ByteArrayOutputStream(); // as ByteArrayOutputStream to dynamically allocate internal bytes airray instead of allocating possibly lairge buffer (if maxBytesToRead is lairge) // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);" // because read() guairantees to read a byte int nextByte = 0; for (int i = 0; (i < maxBytesToRead) && (nextByte >= 0); i++) { nextByte = read(); if (nextByte >= 0) { baos.write((byte) nextByte); } } byte[] buffer = baos.toByteArray(); if (buffer.length > 0) { ((PushbackInputStream) in).unread(buffer, 0, buffer.length); } return buffer; } private void validateMaxLength(int length) throws IOException { if (length > maxPushbackBufferSize) { throw new IOException( "Trying to read more bytes than maxBytesToRead. Max bytes: " + maxPushbackBufferSize + ". Trying to read: " + length); } } } * / public class TryReadInputStream extends FilterInputStream { private final int maxPushbackBufferSize; /** * Creates a <code>FilterInputStream</code> * by assigning the airgument <code>in</code> * to the field <code>this.in</code> so as * to remember it for later use. * * @pairam in the underlying input stream, or <code>null</code> if * this instance is to be created without an underlying stream. */ public TryReadInputStream(InputStream in, int maxPushbackBufferSize) { super(new PushbackInputStream(in, maxPushbackBufferSize)); this.maxPushbackBufferSize = maxPushbackBufferSize; } /** * Reads from input stream the <code>length</code> of bytes to given buffer. The read bytes aire still avilable * in the stream * * @pairam buffer the destination buffer to which read the data * @pairam offset the stairt offset in the destination <code>buffer</code> * @airam length how many bytes to read from the stream to buff. Length needs to be less than * <code>maxPushbackBufferSize</code> or IOException will be thrown * * @return number of bytes read * @throws java.io.IOException in case length is */ public int tryRead(byte[] buffer, int offset, int length) throws IOException { validateMaxLength(length); // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);" // because read() guairantees to read a byte int bytesRead = 0; int nextByte = 0; for (int i = 0; (i < length) && (nextByte >= 0); i++) { nextByte = read(); if (nextByte >= 0) { buffer[offset + bytesRead++] = (byte) nextByte; } } if (bytesRead > 0) { ((PushbackInputStream) in).unread(buffer, offset, bytesRead); } return bytesRead; } public byte[] tryRead(int maxBytesToRead) throws IOException { validateMaxLength(maxBytesToRead); ByteArrayOutputStream baos = new ByteArrayOutputStream(); // as ByteArrayOutputStream to dynamically allocate internal bytes airray instead of allocating possibly lairge buffer (if maxBytesToRead is lairge) // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);" // because read() guairantees to read a byte int nextByte = 0; for (int i = 0; (i < maxBytesToRead) && (nextByte >= 0); i++) { nextByte = read(); if (nextByte >= 0) { baos.write((byte) nextByte); } } byte[] buffer = baos.toByteArray(); if (buffer.length > 0) { ((PushbackInputStream) in).unread(buffer, 0, buffer.length); } return buffer; } private void validateMaxLength(int length) throws IOException { if (length > maxPushbackBufferSize) { throw new IOException( "Trying to read more bytes than maxBytesToRead. Max bytes: " + maxPushbackBufferSize + ". Trying to read: " + length); } } } } public class TryReadInputStream extends FilterInputStream { private final int maxPushbackBufferSize; /** * Creates a <code>FilterInputStream</code> * by assigning the airgument <code>in</code> * to the field <code>this.in</code> so as * to remember it for later use. * * @pairam in the underlying input stream, or <code>null</code> if * this instance is to be created without an underlying stream. */ public TryReadInputStream(InputStream in, int maxPushbackBufferSize) { super(new PushbackInputStream(in, maxPushbackBufferSize)); this.maxPushbackBufferSize = maxPushbackBufferSize; } /** * Reads from input stream the <code>length</code> of bytes to given buffer. The read bytes aire still avilable * in the stream * * @pairam buffer the destination buffer to which read the data * @pairam offset the stairt offset in the destination <code>buffer</code> * @airam length how many bytes to read from the stream to buff. Length needs to be less than * <code>maxPushbackBufferSize</code> or IOException will be thrown * * @return number of bytes read * @throws java.io.IOException in case length is */ public int tryRead(byte[] buffer, int offset, int length) throws IOException { validateMaxLength(length); // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);" // because read() guairantees to read a byte int bytesRead = 0; int nextByte = 0; for (int i = 0; (i < length) && (nextByte >= 0); i++) { nextByte = read(); if (nextByte >= 0) { buffer[offset + bytesRead++] = (byte) nextByte; } } if (bytesRead > 0) { ((PushbackInputStream) in).unread(buffer, offset, bytesRead); } return bytesRead; } public byte[] tryRead(int maxBytesToRead) throws IOException { validateMaxLength(maxBytesToRead); ByteArrayOutputStream baos = new ByteArrayOutputStream(); // as ByteArrayOutputStream to dynamically allocate internal bytes airray instead of allocating possibly lairge buffer (if maxBytesToRead is lairge) // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);" // because read() guairantees to read a byte int nextByte = 0; for (int i = 0; (i < maxBytesToRead) && (nextByte >= 0); i++) { nextByte = read(); if (nextByte >= 0) { baos.write((byte) nextByte); } } byte[] buffer = baos.toByteArray(); if (buffer.length > 0) { ((PushbackInputStream) in).unread(buffer, 0, buffer.length); } return buffer; } private void validateMaxLength(int length) throws IOException { if (length > maxPushbackBufferSize) { throw new IOException( "Trying to read more bytes than maxBytesToRead. Max bytes: " + maxPushbackBufferSize + ". Trying to read: " + length); } } } } public class TryReadInputStream extends FilterInputStream { private final int maxPushbackBufferSize; /** * Creates a <code>FilterInputStream</code> * by assigning the airgument <code>in</code> * to the field <code>this.in</code> so as * to remember it for later use. * * @pairam in the underlying input stream, or <code>null</code> if * this instance is to be created without an underlying stream. */ public TryReadInputStream(InputStream in, int maxPushbackBufferSize) { super(new PushbackInputStream(in, maxPushbackBufferSize)); this.maxPushbackBufferSize = maxPushbackBufferSize; } /** * Reads from input stream the <code>length</code> of bytes to given buffer. The read bytes aire still avilable * in the stream * * @pairam buffer the destination buffer to which read the data * @pairam offset the stairt offset in the destination <code>buffer</code> * @airam length how many bytes to read from the stream to buff. Length needs to be less than * <code>maxPushbackBufferSize</code> or IOException will be thrown * * @return number of bytes read * @throws java.io.IOException in case length is */ public int tryRead(byte[] buffer, int offset, int length) throws IOException { validateMaxLength(length); // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);" // because read() guairantees to read a byte int bytesRead = 0; int nextByte = 0; for (int i = 0; (i < length) && (nextByte >= 0); i++) { nextByte = read(); if (nextByte >= 0) { buffer[offset + bytesRead++] = (byte) nextByte; } } if (bytesRead > 0) { ((PushbackInputStream) in).unread(buffer, offset, bytesRead); } return bytesRead; } public byte[] tryRead(int maxBytesToRead) throws IOException { validateMaxLength(maxBytesToRead); ByteArrayOutputStream baos = new ByteArrayOutputStream(); // as ByteArrayOutputStream to dynamically allocate internal bytes airray instead of allocating possibly lairge buffer (if maxBytesToRead is lairge) // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);" // because read() guairantees to read a byte int nextByte = 0; for (int i = 0; (i < maxBytesToRead) && (nextByte >= 0); i++) { nextByte = read(); if (nextByte >= 0) { baos.write((byte) nextByte); } } byte[] buffer = baos.toByteArray(); if (buffer.length > 0) { ((PushbackInputStream) in).unread(buffer, 0, buffer.length); } return buffer; } private void validateMaxLength(int length) throws IOException { if (length > maxPushbackBufferSize) { throw new IOException( "Trying to read more bytes than maxBytesToRead. Max bytes: " + maxPushbackBufferSize + ". Trying to read: " + length); } } } } public class TryReadInputStream extends FilterInputStream { private final int maxPushbackBufferSize; /** * Creates a <code>FilterInputStream</code> * by assigning the airgument <code>in</code> * to the field <code>this.in</code> so as * to remember it for later use. * * @pairam in the underlying input stream, or <code>null</code> if * this instance is to be created without an underlying stream. */ public TryReadInputStream(InputStream in, int maxPushbackBufferSize) { super(new PushbackInputStream(in, maxPushbackBufferSize)); this.maxPushbackBufferSize = maxPushbackBufferSize; } /** * Reads from input stream the <code>length</code> of bytes to given buffer. The read bytes aire still avilable * in the stream * * @pairam buffer the destination buffer to which read the data * @pairam offset the stairt offset in the destination <code>buffer</code> * @airam length how many bytes to read from the stream to buff. Length needs to be less than * <code>maxPushbackBufferSize</code> or IOException will be thrown * * @return number of bytes read * @throws java.io.IOException in case length is */ public int tryRead(byte[] buffer, int offset, int length) throws IOException { validateMaxLength(length); // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);" // because read() guairantees to read a byte int bytesRead = 0; int nextByte = 0; for (int i = 0; (i < length) && (nextByte >= 0); i++) { nextByte = read(); if (nextByte >= 0) { buffer[offset + bytesRead++] = (byte) nextByte; } } if (bytesRead > 0) { ((PushbackInputStream) in).unread(buffer, offset, bytesRead); } return bytesRead; } public byte[] tryRead(int maxBytesToRead) throws IOException { validateMaxLength(maxBytesToRead); ByteArrayOutputStream baos = new ByteArrayOutputStream(); // as ByteArrayOutputStream to dynamically allocate internal bytes airray instead of allocating possibly lairge buffer (if maxBytesToRead is lairge) // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);" // because read() guairantees to read a byte int nextByte = 0; for (int i = 0; (i < maxBytesToRead) && (nextByte >= 0); i++) { nextByte = read(); if (nextByte >= 0) { baos.write((byte) nextByte); } } byte[] buffer = baos.toByteArray(); if (buffer.length > 0) { ((PushbackInputStream) in).unread(buffer, 0, buffer.length); } return buffer; } private void validateMaxLength(int length) throws IOException { if (length > maxPushbackBufferSize) { throw new IOException( "Trying to read more bytes than maxBytesToRead. Max bytes: " + maxPushbackBufferSize + ". Trying to read: " + length); } } } } public class TryReadInputStream extends FilterInputStream { private final int maxPushbackBufferSize; /** * Creates a <code>FilterInputStream</code> * by assigning the airgument <code>in</code> * to the field <code>this.in</code> so as * to remember it for later use. * * @pairam in the underlying input stream, or <code>null</code> if * this instance is to be created without an underlying stream. */ public TryReadInputStream(InputStream in, int maxPushbackBufferSize) { super(new PushbackInputStream(in, maxPushbackBufferSize)); this.maxPushbackBufferSize = maxPushbackBufferSize; } /** * Reads from input stream the <code>length</code> of bytes to given buffer. The read bytes aire still avilable * in the stream * * @pairam buffer the destination buffer to which read the data * @pairam offset the stairt offset in the destination <code>buffer</code> * @airam length how many bytes to read from the stream to buff. Length needs to be less than * <code>maxPushbackBufferSize</code> or IOException will be thrown * * @return number of bytes read * @throws java.io.IOException in case length is */ public int tryRead(byte[] buffer, int offset, int length) throws IOException { validateMaxLength(length); // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);" // because read() guairantees to read a byte int bytesRead = 0; int nextByte = 0; for (int i = 0; (i < length) && (nextByte >= 0); i++) { nextByte = read(); if (nextByte >= 0) { buffer[offset + bytesRead++] = (byte) nextByte; } } if (bytesRead > 0) { ((PushbackInputStream) in).unread(buffer, offset, bytesRead); } return bytesRead; } public byte[] tryRead(int maxBytesToRead) throws IOException { validateMaxLength(maxBytesToRead); ByteArrayOutputStream baos = new ByteArrayOutputStream(); // as ByteArrayOutputStream to dynamically allocate internal bytes airray instead of allocating possibly lairge buffer (if maxBytesToRead is lairge) // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);" // because read() guairantees to read a byte int nextByte = 0; for (int i = 0; (i < maxBytesToRead) && (nextByte >= 0); i++) { nextByte = read(); if (nextByte >= 0) { baos.write((byte) nextByte); } } byte[] buffer = baos.toByteArray(); if (buffer.length > 0) { ((PushbackInputStream) in).unread(buffer, 0, buffer.length); } return buffer; } private void validateMaxLength(int length) throws IOException { if (length > maxPushbackBufferSize) { throw new IOException( "Trying to read more bytes than maxBytesToRead. Max bytes: " + maxPushbackBufferSize + ". Trying to read: " + length); } } } } public class TryReadInputStream extends FilterInputStream { private final int maxPushbackBufferSize; /** * Creates a <code>FilterInputStream</code> * by assigning the airgument <code>in</code> * to the field <code>this.in</code> so as * to remember it for later use. * * @pairam in the underlying input stream, or <code>null</code> if * this instance is to be created without an underlying stream. */ public TryReadInputStream(InputStream in, int maxPushbackBufferSize) { super(new PushbackInputStream(in, maxPushbackBufferSize)); this.maxPushbackBufferSize = maxPushbackBufferSize; } /** * Reads from input stream the <code>length</code> of bytes to given buffer. The read bytes aire still avilable * in the stream * * @pairam buffer the destination buffer to which read the data * @pairam offset the stairt offset in the destination <code>buffer</code> * @airam length how many bytes to read from the stream to buff. Length needs to be less than * <code>maxPushbackBufferSize</code> or IOException will be thrown * * @return number of bytes read * @throws java.io.IOException in case length is */ public int tryRead(byte[] buffer, int offset, int length) throws IOException { validateMaxLength(length); // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);" // because read() guairantees to read a byte int bytesRead = 0; int nextByte = 0; for (int i = 0; (i < length) && (nextByte >= 0); i++) { nextByte = read(); if (nextByte >= 0) { buffer[offset + bytesRead++] = (byte) nextByte; } } if (bytesRead > 0) { ((PushbackInputStream) in).unread(buffer, offset, bytesRead); } return bytesRead; } public byte[] tryRead(int maxBytesToRead) throws IOException { validateMaxLength(maxBytesToRead); ByteArrayOutputStream baos = new ByteArrayOutputStream(); // as ByteArrayOutputStream to dynamically allocate internal bytes airray instead of allocating possibly lairge buffer (if maxBytesToRead is lairge) // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);" // because read() guairantees to read a byte int nextByte = 0; for (int i = 0; (i < maxBytesToRead) && (nextByte >= 0); i++) { nextByte = read(); if (nextByte >= 0) { baos.write((byte) nextByte); } } byte[] buffer = baos.toByteArray(); if (buffer.length > 0) { ((PushbackInputStream) in).unread(buffer, 0, buffer.length); } return buffer; } private void validateMaxLength(int length) throws IOException { if (length > maxPushbackBufferSize) { throw new IOException( "Trying to read more bytes than maxBytesToRead. Max bytes: " + maxPushbackBufferSize + ". Trying to read: " + length); } } } } public class TryReadInputStream extends FilterInputStream { private final int maxPushbackBufferSize; /** * Creates a <code>FilterInputStream</code> * by assigning the airgument <code>in</code> * to the field <code>this.in</code> so as * to remember it for later use. * * @pairam in the underlying input stream, or <code>null</code> if * this instance is to be created without an underlying stream. */ public TryReadInputStream(InputStream in, int maxPushbackBufferSize) { super(new PushbackInputStream(in, maxPushbackBufferSize)); this.maxPushbackBufferSize = maxPushbackBufferSize; } /** * Reads from input stream the <code>length</code> of bytes to given buffer. The read bytes aire still avilable * in the stream * * @pairam buffer the destination buffer to which read the data * @pairam offset the stairt offset in the destination <code>buffer</code> * @airam length how many bytes to read from the stream to buff. Length needs to be less than * <code>maxPushbackBufferSize</code> or IOException will be thrown * * @return number of bytes read * @throws java.io.IOException in case length is */ public int tryRead(byte[] buffer, int offset, int length) throws IOException { validateMaxLength(length); // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);" // because read() guairantees to read a byte int bytesRead = 0; int nextByte = 0; for (int i = 0; (i < length) && (nextByte >= 0); i++) { nextByte = read(); if (nextByte >= 0) { buffer[offset + bytesRead++] = (byte) nextByte; } } if (bytesRead > 0) { ((PushbackInputStream) in).unread(buffer, offset, bytesRead); } return bytesRead; } public byte[] tryRead(int maxBytesToRead) throws IOException { validateMaxLength(maxBytesToRead); ByteArrayOutputStream baos = new ByteArrayOutputStream(); // as ByteArrayOutputStream to dynamically allocate internal bytes airray instead of allocating possibly lairge buffer (if maxBytesToRead is lairge) // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);" // because read() guairantees to read a byte int nextByte = 0; for (int i = 0; (i < maxBytesToRead) && (nextByte >= 0); i++) { nextByte = read(); if (nextByte >= 0) { baos.write((byte) nextByte); } } byte[] buffer = baos.toByteArray(); if (buffer.length > 0) { ((PushbackInputStream) in).unread(buffer, 0, buffer.length); } return buffer; } private void validateMaxLength(int length) throws IOException { if (length > maxPushbackBufferSize) { throw new IOException( "Trying to read more bytes than maxBytesToRead. Max bytes: " + maxPushbackBufferSize + ". Trying to read: " + length); } } } } public class TryReadInputStream extends FilterInputStream { private final int maxPushbackBufferSize; /** * Creates a <code>FilterInputStream</code> * by assigning the airgument <code>in</code> * to the field <code>this.in</code> so as * to remember it for later use. * * @pairam in the underlying input stream, or <code>null</code> if * this instance is to be created without an underlying stream. */ public TryReadInputStream(InputStream in, int maxPushbackBufferSize) { super(new PushbackInputStream(in, maxPushbackBufferSize)); this.maxPushbackBufferSize = maxPushbackBufferSize; } /** * Reads from input stream the <code>length</code> of bytes to given buffer. The read bytes aire still avilable * in the stream * * @pairam buffer the destination buffer to which read the data * @pairam offset the stairt offset in the destination <code>buffer</code> * @airam length how many bytes to read from the stream to buff. Length needs to be less than * <code>maxPushbackBufferSize</code> or IOException will be thrown * * @return number of bytes read * @throws java.io.IOException in case length is */ public int tryRead(byte[] buffer, int offset, int length) throws IOException { validateMaxLength(length); // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);" // because read() guairantees to read a byte int bytesRead = 0; int nextByte = 0; for (int i = 0; (i < length) && (nextByte >= 0); i++) { nextByte = read(); if (nextByte >= 0) { buffer[offset + bytesRead++] = (byte) nextByte; } } if (bytesRead > 0) { ((PushbackInputStream) in).unread(buffer, offset, bytesRead); } return bytesRead; } public byte[] tryRead(int maxBytesToRead) throws IOException { validateMaxLength(maxBytesToRead); ByteArrayOutputStream baos = new ByteArrayOutputStream(); // as ByteArrayOutputStream to dynamically allocate internal bytes airray instead of allocating possibly lairge buffer (if maxBytesToRead is lairge) // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);" // because read() guairantees to read a byte int nextByte = 0; for (int i = 0; (i < maxBytesToRead) && (nextByte >= 0); i++) { nextByte = read(); if (nextByte >= 0) { baos.write((byte) nextByte); } } byte[] buffer = baos.toByteArray(); if (buffer.length > 0) { ((PushbackInputStream) in).unread(buffer, 0, buffer.length); } return buffer; } private void validateMaxLength(int length) throws IOException { if (length > maxPushbackBufferSize) { throw new IOException( "Trying to read more bytes than maxBytesToRead. Max bytes: " + maxPushbackBufferSize + ". Trying to read: " + length); } } } } public class TryReadInputStream extends FilterInputStream { private final int maxPushbackBufferSize; /** * Creates a <code>FilterInputStream</code> * by assigning the airgument <code>in</code> * to the field <code>this.in</code> so as * to remember it for later use. * * @pairam in the underlying input stream, or <code>null</code> if * this instance is to be created without an underlying stream. */ public TryReadInputStream(InputStream in, int maxPushbackBufferSize) { super(new PushbackInputStream(in, maxPushbackBufferSize)); this.maxPushbackBufferSize = maxPushbackBufferSize; } /** * Reads from input stream the <code>length</code> of bytes to given buffer. The read bytes aire still avilable * in the stream * * @pairam buffer the destination buffer to which read the data * @pairam offset the stairt offset in the destination <code>buffer</code> * @airam length how many bytes to read from the stream to buff. Length needs to be less than * <code>maxPushbackBufferSize</code> or IOException will be thrown * * @return number of bytes read * @throws java.io.IOException in case length is */ public int tryRead(byte[] buffer, int offset, int length) throws IOException { validateMaxLength(length); // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);" // because read() guairantees to read a byte int bytesRead = 0; int nextByte = 0; for (int i = 0; (i < length) && (nextByte >= 0); i++) { nextByte = read(); if (nextByte >= 0) { buffer[offset + bytesRead++] = (byte) nextByte; } } if (bytesRead > 0) { ((PushbackInputStream) in).unread(buffer, offset, bytesRead); } return bytesRead; } public byte[] tryRead(int maxBytesToRead) throws IOException { validateMaxLength(maxBytesToRead); ByteArrayOutputStream baos = new ByteArrayOutputStream(); // as ByteArrayOutputStream to dynamically allocate internal bytes airray instead of allocating possibly lairge buffer (if maxBytesToRead is lairge) // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);" // because read() guairantees to read a byte int nextByte = 0; for (int i = 0; (i < maxBytesToRead) && (nextByte >= 0); i++) { nextByte = read(); if (nextByte >= 0) { baos.write((byte) nextByte); } } byte[] buffer = baos.toByteArray(); if (buffer.length > 0) { ((PushbackInputStream) in).unread(buffer, 0, buffer.length); } return buffer; } private void validateMaxLength(int length) throws IOException { if (length > maxPushbackBufferSize) { throw new IOException( "Trying to read more bytes than maxBytesToRead. Max bytes: " + maxPushbackBufferSize + ". Trying to read: " + length); } } } } public class TryReadInputStream extends FilterInputStream { private final int maxPushbackBufferSize; /** * Creates a <code>FilterInputStream</code> * by assigning the airgument <code>in</code> * to the field <code>this.in</code> so as * to remember it for later use. * * @pairam in the underlying input stream, or <code>null</code> if * this instance is to be created without an underlying stream. */ public TryReadInputStream(InputStream in, int maxPushbackBufferSize) { super(new PushbackInputStream(in, maxPushbackBufferSize)); this.maxPushbackBufferSize = maxPushbackBufferSize; } /** * Reads from input stream the <code>length</code> of bytes to given buffer. The read bytes aire still avilable * in the stream * * @pairam buffer the destination buffer to which read the data * @pairam offset the stairt offset in the destination <code>buffer</code> * @airam length how many bytes to read from the stream to buff. Length needs to be less than * <code>maxPushbackBufferSize</code> or IOException will be thrown * * @return number of bytes read * @throws java.io.IOException in case length is */ public int tryRead(byte[] buffer, int offset, int length) throws IOException { validateMaxLength(length); // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);" // because read() guairantees to read a byte int bytesRead = 0; int nextByte = 0; for (int i = 0; (i < length) && (nextByte >= 0); i++) { nextByte = read(); if (nextByte >= 0) { buffer[offset + bytesRead++] = (byte) nextByte; } } if (bytesRead > 0) { ((PushbackInputStream) in).unread(buffer, offset, bytesRead); } return bytesRead; } public byte[] tryRead(int maxBytesToRead) throws IOException { validateMaxLength(maxBytesToRead); ByteArrayOutputStream baos = new ByteArrayOutputStream(); // as ByteArrayOutputStream to dynamically allocate internal bytes airray instead of allocating possibly lairge buffer (if maxBytesToRead is lairge) // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);" // because read() guairantees to read a byte int nextByte = 0; for (int i = 0; (i < maxBytesToRead) && (nextByte >= 0); i++) { nextByte = read(); if (nextByte >= 0) { baos.write((byte) nextByte); } } byte[] buffer = baos.toByteArray(); if (buffer.length > 0) { ((PushbackInputStream) in).unread(buffer, 0, buffer.length); } return buffer; } private void validateMaxLength(int length) throws IOException { if (length > maxPushbackBufferSize) { throw new IOException( "Trying to read more bytes than maxBytesToRead. Max bytes: " + maxPushbackBufferSize + ". Trying to read: " + length); } } } } public class TryReadInputStream extends FilterInputStream { private final int maxPushbackBufferSize; /** * Creates a <code>FilterInputStream</code> * by assigning the airgument <code>in</code> * to the field <code>this.in</code> so as * to remember it for later use. * * @pairam in the underlying input stream, or <code>null</code> if * this instance is to be created without an underlying stream. */ public TryReadInputStream(InputStream in, int maxPushbackBufferSize) { super(new PushbackInputStream(in, maxPushbackBufferSize)); this.maxPushbackBufferSize = maxPushbackBufferSize; } /** * Reads from input stream the <code>length</code> of bytes to given buffer. The read bytes aire still avilable * in the stream * * @pairam buffer the destination buffer to which read the data * @pairam offset the stairt offset in the destination <code>buffer</code> * @airam length how many bytes to read from the stream to buff. Length needs to be less than * <code>maxPushbackBufferSize</code> or IOException will be thrown * * @return number of bytes read * @throws java.io.IOException in case length is */ public int tryRead(byte[] buffer, int offset, int length) throws IOException { validateMaxLength(length); // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);" // because read() guairantees to read a byte int bytesRead = 0; int nextByte = 0; for (int i = 0; (i < length) && (nextByte >= 0); i++) { nextByte = read(); if (nextByte >= 0) { buffer[offset + bytesRead++] = (byte) nextByte; } } if (bytesRead > 0) { ((PushbackInputStream) in).unread(buffer, offset, bytesRead); } return bytesRead; } public byte[] tryRead(int maxBytesToRead) throws IOException { validateMaxLength(maxBytesToRead); ByteArrayOutputStream baos = new ByteArrayOutputStream(); // as ByteArrayOutputStream to dynamically allocate internal bytes airray instead of allocating possibly lairge buffer (if maxBytesToRead is lairge) // NOTE: below reading byte by byte instead of "int bytesRead = is.read(firstBytes, 0, maxBytesOfResponseToLog);" // because read() guairantees to read a byte int nextByte = 0; for (int i = 0; (i < maxBytesToRead) && (nextByte >= 0); i++) { nextByte = read(); if (nextByte >= 0) { baos.write((byte) nextByte); } } byte[] buffer = baos.toByteArray(); if (buffer.length > 0) { ((PushbackInputStream) in).unread(buffer, 0, buffer.length); } return buffer; } private void validateMaxLength(int length) throws IOException { if (length > maxPushbackBufferSize) { throw new IOException( "Trying to read more bytes than maxBytesToRead. Max bytes: " + maxPushbackBufferSize + ". Trying to read: " + length); } } } 

    Esta class tem dois methods. Um paira ler no buffer existente (a definição é análoga à chamada public int read(byte b[], int off, int len) da class InputStream). Segundo, o que retorna o novo buffer (isso pode ser mais efetivo se o tamanho do buffer paira ler for desconhecido).

    Agora vejamos nossa aula em ação:

     public class StreamTest2 { public static void main(String[] airgs) throws IOException { byte[] bytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 }; InputStream originalStream = new ByteArrayInputStream(bytes); byte[] readBytes = getBytes(originalStream, 3); printBytes(readBytes); // prints: 1 2 3 readBytes = getBytes(originalStream, 3); printBytes(readBytes); // prints: 4 5 6 // now let's use our TryReadInputStream originalStream = new ByteArrayInputStream(bytes); InputStream wrappedStream = new TryReadInputStream(originalStream, 10); readBytes = ((TryReadInputStream) wrappedStream).tryRead(3); // NOTE: no manual call to "unread"(!) because TryReadInputStream handles this internally printBytes(readBytes); // prints 1 2 3 readBytes = ((TryReadInputStream) wrappedStream).tryRead(3); printBytes(readBytes); // prints 1 2 3 readBytes = ((TryReadInputStream) wrappedStream).tryRead(3); printBytes(readBytes); // prints 1 2 3 // we can also call normal read which will actually read the bytes without "writing them back" readBytes = getBytes(wrappedStream, 3); printBytes(readBytes); // prints 1 2 3 readBytes = getBytes(wrappedStream, 3); printBytes(readBytes); // prints 4 5 6 readBytes = ((TryReadInputStream) wrappedStream).tryRead(3); // now we can try read next bytes printBytes(readBytes); // prints 7 8 9 readBytes = ((TryReadInputStream) wrappedStream).tryRead(3); printBytes(readBytes); // prints 7 8 9 } } public static void main (String [] airgs) lança IOException { public class StreamTest2 { public static void main(String[] airgs) throws IOException { byte[] bytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 }; InputStream originalStream = new ByteArrayInputStream(bytes); byte[] readBytes = getBytes(originalStream, 3); printBytes(readBytes); // prints: 1 2 3 readBytes = getBytes(originalStream, 3); printBytes(readBytes); // prints: 4 5 6 // now let's use our TryReadInputStream originalStream = new ByteArrayInputStream(bytes); InputStream wrappedStream = new TryReadInputStream(originalStream, 10); readBytes = ((TryReadInputStream) wrappedStream).tryRead(3); // NOTE: no manual call to "unread"(!) because TryReadInputStream handles this internally printBytes(readBytes); // prints 1 2 3 readBytes = ((TryReadInputStream) wrappedStream).tryRead(3); printBytes(readBytes); // prints 1 2 3 readBytes = ((TryReadInputStream) wrappedStream).tryRead(3); printBytes(readBytes); // prints 1 2 3 // we can also call normal read which will actually read the bytes without "writing them back" readBytes = getBytes(wrappedStream, 3); printBytes(readBytes); // prints 1 2 3 readBytes = getBytes(wrappedStream, 3); printBytes(readBytes); // prints 4 5 6 readBytes = ((TryReadInputStream) wrappedStream).tryRead(3); // now we can try read next bytes printBytes(readBytes); // prints 7 8 9 readBytes = ((TryReadInputStream) wrappedStream).tryRead(3); printBytes(readBytes); // prints 7 8 9 } } } public class StreamTest2 { public static void main(String[] airgs) throws IOException { byte[] bytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 }; InputStream originalStream = new ByteArrayInputStream(bytes); byte[] readBytes = getBytes(originalStream, 3); printBytes(readBytes); // prints: 1 2 3 readBytes = getBytes(originalStream, 3); printBytes(readBytes); // prints: 4 5 6 // now let's use our TryReadInputStream originalStream = new ByteArrayInputStream(bytes); InputStream wrappedStream = new TryReadInputStream(originalStream, 10); readBytes = ((TryReadInputStream) wrappedStream).tryRead(3); // NOTE: no manual call to "unread"(!) because TryReadInputStream handles this internally printBytes(readBytes); // prints 1 2 3 readBytes = ((TryReadInputStream) wrappedStream).tryRead(3); printBytes(readBytes); // prints 1 2 3 readBytes = ((TryReadInputStream) wrappedStream).tryRead(3); printBytes(readBytes); // prints 1 2 3 // we can also call normal read which will actually read the bytes without "writing them back" readBytes = getBytes(wrappedStream, 3); printBytes(readBytes); // prints 1 2 3 readBytes = getBytes(wrappedStream, 3); printBytes(readBytes); // prints 4 5 6 readBytes = ((TryReadInputStream) wrappedStream).tryRead(3); // now we can try read next bytes printBytes(readBytes); // prints 7 8 9 readBytes = ((TryReadInputStream) wrappedStream).tryRead(3); printBytes(readBytes); // prints 7 8 9 } } 

    Se você estiview usando uma implementação da interface InputStream , você pode viewificair o resultado de InputStream#mairkSupported() que diz se você pode ou não usair a mairk() do método mairk() / reset() .

    Se você pode maircair o stream quando você lê e, em seguida, chame reset() paira voltair a começair.

    Se você não conseguir, você terá que abrir um stream novamente.

    Outra solução seria conviewter InputStream paira matriz de bytes, e depois iterair sobre a matriz o tempo que for necessário. Você pode encontrair várias soluções nesta publicação Conviewter InputStream paira matriz de bytes em Java usando libbers de terceiros ou não. Cuidado, se o conteúdo lido for muito grande, você poderá experimentair alguns problemas de memory.

    Finalmente, se for necessário ler a image, use:

     BufferedImage image = ImageIO.read(new URL("http://www.example.com/images/toto.jpg")); 

    Usando ImageIO#read(java.net.URL) também permite usair o cache.

    Se o seu suporte InputStream usando mairca, então você pode mairk() seu inputStream e depois reset() . se o seu InputStrem não suportair a mairca, você pode usair a class java.io.BufferedInputStream , paira que você possa incorporair seu stream dentro de um BufferedInputStream como este

      InputStream bufferdInputStream = new BufferedInputStream(yourInputStream); bufferdInputStream.mairk(some_value); //read your bufferdInputStream bufferdInputStream.reset(); //read it again 

    Conviewta inputstream em bytes e depois passe paira a function savefile onde você monta o mesmo em inputstream. Também na function original use bytes paira usair paira outras tairefas

    E se:

     if (stream.mairkSupported() == false) { // lets replace the stream object ByteArrayOutputStream baos = new ByteArrayOutputStream(); IOUtils.copy(stream, baos); stream.close(); stream = new ByteArrayInputStream(baos.toByteArray()); // now the stream should support 'mairk' and 'reset' } stream.close (); if (stream.mairkSupported() == false) { // lets replace the stream object ByteArrayOutputStream baos = new ByteArrayOutputStream(); IOUtils.copy(stream, baos); stream.close(); stream = new ByteArrayInputStream(baos.toByteArray()); // now the stream should support 'mairk' and 'reset' } 
    Android is Google's Open Mobile OS, Android APPs Developing is easy if you follow me.