buffer2stream.html

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<TITLE>Creating a Stream on a ByteBuffer
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  <h3>
    e184.  
    Creating a Stream on a ByteBuffer</h3>

This example implements methods for creating an input or 
output stream on a <code>ByteBuffer</code>.


<pre>
    // Obtain a ByteBuffer; see <a href="../java.nio/CreateBuf.html" class="eglink"><font size="-1"><b>e158</b> Creating a ByteBuffer</font></a>.
    ByteBuffer buf = <font color="#0066ff"><i>ByteBuffer.allocate(10)</i></font>;
    
    // Create an output stream on the ByteBuffer
    OutputStream os = newOutputStream(buf);
    
    // Create an input stream on the ByteBuffer
    InputStream is = newInputStream(buf);
    
    // Returns an output stream for a ByteBuffer.
    // The write() methods use the relative ByteBuffer put() methods.
    public static OutputStream newOutputStream(final ByteBuffer buf) {
        return new OutputStream() {
            public synchronized void write(int b) throws IOException {
                buf.put((byte)b);
            }
    
            public synchronized void write(byte[] bytes, int off, int len) throws IOException {
                buf.put(bytes, off, len);
            }
        };
    }
    
    // Returns an input stream for a ByteBuffer.
    // The read() methods use the relative ByteBuffer get() methods.
    public static InputStream newInputStream(final ByteBuffer buf) {
        return new InputStream() {
            public synchronized int read() throws IOException {
                if (!buf.hasRemaining()) {
                    return -1;
                }
                return buf.get();
            }
    
            public synchronized int read(byte[] bytes, int off, int len) throws IOException {
                // Read only what's left
                len = Math.min(len, buf.remaining());
                buf.get(bytes, off, len);
                return len;
            }
        };
    }
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            &nbsp;Related Examples
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e183. <a class="eglink" href="Channel2Stream.html?l=rel">
    Creating a Stream from a Channel
</a>
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        See also: 
<a class="eglink" href="/egs/java.nio/pkg.html?l=rel#Byte%20Buffers">
    Byte Buffers
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.nio/pkg.html?l=rel#File%20Locking">
    File Locking
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.nio/pkg.html?l=rel#Files">
    Files
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.nio/pkg.html?l=rel#Sockets">
    Sockets
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