使用gzip压缩流及Content-Encoding响应头

package cn.itcast.web.http;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.GZIPOutputStream;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class Demo2 extends HttpServlet {
	public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
		
		
		String data = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
		System.out.println("压缩前：" + data.length());
		
		ByteArrayOutputStream bout = new ByteArrayOutputStream();
		GZIPOutputStream gzip = new GZIPOutputStream(bout);
		gzip.write(data.getBytes());
		gzip.flush();
		gzip.close();
		//data压缩数据已经进入bout字节数组中了
		
		
		byte[] buf = bout.toByteArray();
		//取出来的数据，就是压缩后的数据
		System.out.println("压缩后：" + buf.length);
		
		//服务器传回数据的类型和长度
		response.setHeader("content-encoding","gzip");
		response.setHeader("content-length",buf.length+"");
		
		response.getOutputStream().write(buf);
	}
}