servlet 对传输数据进行压缩

背景：由于目前做一体化项目，该项目是js左面应用程序，类似webqq，会产生大量的传输数据，程序如下

package com.test;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.zip.GZIPOutputStream;

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

public class GzipUtils {

    // 根据报头来判断浏览器是否支持gzip解压缩功能
    public static boolean isGzipSupported(HttpServletRequest request) {
        String encodings = request.getHeader("Accept-Encoding");
        return ((encodings != null) && (encodings.indexOf("gzip") != -1));
    }

    // 判断gzip功能是否已经启用
    public static boolean isGzipDisabled(HttpServletRequest request) {
        String flag = request.getParameter("disableGzip");
        return ((flag != null) && (!flag.equalsIgnoreCase("false")));
    }
    
    //返回gzip压缩后的PrintWriter
    public static PrintWriter getGzipWriter(HttpServletResponse response){
        try {
            return (new PrintWriter(new GZIPOutputStream(response.getOutputStream())));
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return null;
        }
    }

}

package com.test;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.StringReader;
import java.util.Date;
import java.util.zip.ZipInputStream;

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

import com.sun.xml.internal.messaging.saaj.util.ByteInputStream;

public class TestServlet extends HttpServlet {

    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        doPost(req, resp);
    }

    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        System.out.println(new Date());
        String s = "wanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghui"
            +"wanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghui"
            +"wanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghui"
            +"wanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghui"
            +"wanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghui"
            +"wanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghui"
            +"wanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghui"
            +"wanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghui"
            +"wanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghui"
            +"wanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghuiwanhonghui"
            ;
        PrintWriter out =null;
         if (GzipUtils.isGzipSupported(req)
                    && !GzipUtils.isGzipDisabled(req)) {
                out = GzipUtils.getGzipWriter(resp);
                resp.setHeader("Content-Encoding", "gzip");
            } else {
                out = resp.getWriter();
            }
        
       
        out.println(s);
        out.close();
        
    
    }

}