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本代码源自网上：http://www.koders.com/java/fid5A2897DDE860FCC1D9D9E0EA5A2834CC62A87E85.aspx
import java.io.IOException;
import java.io.OutputStream;
import java.io.Writer;
/* ------------------------------------------------------------ */
/** Wrap a Writer as an OutputStream.
* When all you have is a Writer and only an OutputStream will do.
* Try not to use this as it indicates that your design is a dogs
* breakfast (JSP made me write it).
* @version 1.0 Tue Feb 12 2002
* @author Greg Wilkins (gregw)
*/
public class WriterOutputStream extends OutputStream
{
protected Writer _writer;
protected String _encoding;
private byte[] _buf=new byte[1];
/* ------------------------------------------------------------ */
public WriterOutputStream(Writer writer, String encoding)
{
_writer=writer;
_encoding=encoding;
}
/* ------------------------------------------------------------ */
public WriterOutputStream(Writer writer)
{
_writer=writer;
}
/* ------------------------------------------------------------ */
public void close()
throws IOException
{
_writer.close();
_writer=null;
_encoding=null;
}
/* ------------------------------------------------------------ */
public void flush()
throws IOException
{
_writer.flush();
}
/* ------------------------------------------------------------ */
public void write(byte[] b)
throws IOException
{
if (_encoding==null)
_writer.write(new String(b));
else
_writer.write(new String(b,_encoding));
}
/* ------------------------------------------------------------ */
public void write(byte[] b, int off, int len)
throws IOException
{
if (_encoding==null)
_writer.write(new String(b,off,len));
else
_writer.write(new String(b,off,len,_encoding));
}
/* ------------------------------------------------------------ */
public synchronized void write(int b)
throws IOException
{
_buf[0]=(byte)b;
write(_buf);
}
