实现压缩响应[对servlet输出进行压缩]

package cn.itcast.web.decorator;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.OutputStreamWriter;import java.io.PrintWriter;import javax.servlet.ServletOutputStream;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpServletResponseWrapper;//对response对象的装饰/包装public class MyResponse extends HttpServletResponseWrapper{	private HttpServletResponse response;	//缓存	private ByteArrayOutputStream bout = new ByteArrayOutputStream();	private PrintWriter pw;	public MyResponse(HttpServletResponse response) {		super(response);		this.response = response;	}	//重写父类方法,目的是将字节输出到缓存中去[字节]	public ServletOutputStream getOutputStream() throws IOException {		return new MyServletOutputStream(bout);	}	//重写父类方法,目的是将字符输出到缓存中去[字符]	public PrintWriter getWriter() throws IOException {		pw = new PrintWriter(new OutputStreamWriter(bout,"UTF-8"));		return pw;	}	//取得缓存中的数据	public byte[] getBuffer(){		if(pw!=null){			pw.flush();		}		return bout.toByteArray();	}}//带有缓存功能ServletOutputStreamclass MyServletOutputStream extends ServletOutputStream{	private ByteArrayOutputStream bout;	public MyServletOutputStream(ByteArrayOutputStream bout) {		this.bout = bout;	}	public void write(int b) throws IOException {	}	public void write(byte[] bytes) throws IOException {		//将字节数组的内容写入缓存		bout.write(bytes);		//确保所有字节数组内容进入缓存		bout.flush();	}}