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ByteArrayInputStream is an implementation of an input stream that uses a byte array as the source This class has two constructors, each of which requires a byte array to provide the data source: ByteArrayInputStream(byte array[ ]) ByteArrayInputStream(byte array[ ], int start, int numBytes) Here, array is the input source The second constructor creates an InputStream from a subset of your byte array that begins with the character at the index specified by start and is numBytes long The following example creates a pair of ByteArrayInputStreams, initializing them with
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the byte representation of the alphabet: // Demonstrate ByteArrayInputStream import javaio*; class ByteArrayInputStreamDemo { public static void main(String args[]) throws IOException { String tmp = "abcdefghijklmnopqrstuvwxyz"; byte b[] = tmpgetBytes(); ByteArrayInputStream input1 = new ByteArrayInputStream(b); ByteArrayInputStream input2 = new ByteArrayInputStream(b, 0,3); } } The input1 object contains the entire lowercase alphabet, while input2 contains only the first three letters A ByteArrayInputStream implements both mark( ) and reset( ) However, if mark( ) has not been called, then reset( ) sets the stream pointer to the start of the stream-which in this case is the start of the byte array passed to the constructor The next example shows how to use the reset( ) method to read the same input twice In this case, we read and print the letters "abc" once in lowercase and then again in uppercase import javaio*; class ByteArrayInputStreamReset { public static void main(String args[]) throws IOException { String tmp = "abc"; byte b[] = tmpgetBytes(); ByteArrayInputStream in = new ByteArrayInputStream(b); for (int i=0; i<2; i++) { int c; while ((c = inread()) != -1) { if (i == 0) { Systemoutprint((char) c); } else { Systemoutprint(CharactertoUpperCase((char) c)); } } Systemoutprintln(); inreset(); }
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This example first reads each character from the stream and prints it as is, in lowercase It then resets the stream and begins reading again, this time converting each character to uppercase before printing Here's the output: abc ABC
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ByteArrayOutputStream is an implementation of an output stream that uses a byte array as the destination ByteArrayOutputStream has two constructors, shown here: ByteArrayOutputStream( )
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ByteArrayOutputStream(int numBytes) In the first form, a buffer of 32 bytes is created In the second, a buffer is created with a size equal to that specified by numBytes The buffer is held in the protected buf field of ByteArrayOutputStream The buffer size will be increased automatically, if needed The number of bytes held by the buffer is contained in the protected count field of ByteArrayOutputStream The following example demonstrates ByteArrayOutputStream: // Demonstrate ByteArrayOutputStream import javaio*; class ByteArrayOutputStreamDemo { public static void main(String args[]) throws IOException { ByteArrayOutputStream f = new ByteArrayOutputStream(); String s = "This should end up in the array"; byte buf[] = sgetBytes(); fwrite(buf); Systemoutprintln("Buffer as a string"); Systemoutprintln(ftoString()); Systemoutprintln("Into array"); byte b[] = ftoByteArray(); for (int i=0; i<blength; i++) { Systemoutprint((char) b[i]); } Systemoutprintln("\\nTo an OutputStream()"); OutputStream f2 = new FileOutputStream("testtxt"); fwriteTo(f2); f2close(); Systemoutprintln("Doing a reset"); freset(); for (int i=0; i<3; i++) fwrite('X'); Systemoutprintln(ftoString());
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When you run the program, you will create the following output Notice how after the call to reset( ), the three X's end up at the beginning Buffer as a string This should end up in the array Into array This should end up in the array To an OutputStream() Doing a reset XXX This example uses the writeTo( ) convenience method to write the contents of f to testtxt Examining the contents of the testtxt file created in the preceding example shows the result we expected: This should end up in the array
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Filtered Byte Streams
Filtered streams are simply wrappers around underlying input or output streams that transparently provide some extended level of functionality These streams are typically
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accessed by methods that are expecting a generic stream, which is a superclass of the filtered streams Typical extensions are buffering, character translation, and raw data translation The filtered byte streams are FilterInputStream and FilterOutputStream Their constructors are shown here: FilterOutputStream(OutputStream os) FilterInputStream(InputStream is) The methods provided in these classes are identical to those in InputStream and OutputStream
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