复习后台代码（与前面clentHttp连接网络结合）

 package com.zzw.LoginServelt;

 import java.io.IOException;
 import java.io.PrintWriter;

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

 public class LoginServelt extends HttpServlet {
     public void doGet(HttpServletRequest request, HttpServletResponse response)
             throws ServletException, IOException {

         response.setContentType("text/html;charset=UTF-8");
         PrintWriter out = response.getWriter();
         String username = request.getParameter("username");
         System.out
                 .println(new String(username.getBytes("ISO-8859-1"), "utf-8"));
         out.write("连接成功");
         out.flush();
         out.close();
     }

     public void doPost(HttpServletRequest request, HttpServletResponse response)
             throws ServletException, IOException {
         this.doGet(request, response);
     }

 }