monitoredoutputstream.java

一个很成功的struts上传下载的demo........自己修改版,通用

/* Licence:
 *   Use this however/wherever you like, just don't blame me if it breaks anything.
 *
 * Credit:
 *   If you're nice, you'll leave this bit:
 *
 *   Class by Pierre-Alexandre Losson -- http://www.telio.be/blog
 *   email : [e-mail]
 */
package be.telio.mediastore.ui.upload;

import java.io.OutputStream;
import java.io.IOException;

/**
 * Created by IntelliJ IDEA.
 * 
 * @author Original : plosson on 05-janv.-2006 10:44:18 - Last modified by
 *         $Author: plosson $ on $Date: 2006/01/05 10:44:49 $
 * @version 1.0 - Rev. $Revision: 1.2 $
 */
public class MonitoredOutputStream extends OutputStream {
	private OutputStream target;
	private OutputStreamListener listener;

	public MonitoredOutputStream(OutputStream target,
			OutputStreamListener listener) {
		this.target = target;
		this.listener = listener;
		this.listener.start();
	}

	public void write(byte b[], int off, int len) throws IOException {
		target.write(b, off, len);
		listener.bytesRead(len - off);
	}

	public void write(byte b[]) throws IOException {
		target.write(b);
		listener.bytesRead(b.length);
	}

	public void write(int b) throws IOException {
		target.write(b);
		listener.bytesRead(1);
	}

	public void close() throws IOException {
		target.close();
		listener.done();
	}

	public void flush() throws IOException {
		target.flush();
	}
}