服务器代码:
LoginServlet:
package com;

import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.OutputStream;

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

/** *//*******************************************************************************
*
* @author zdw
*
*/
@SuppressWarnings("serial")
public class LoginServlet extends HttpServlet
{

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

????public void doPost(HttpServletRequest request, HttpServletResponse response)
????????????throws ServletException, IOException
????{
????????// 得到客户端传入的数据(用户名和密码)
???????? String username = request.getParameter("username");
???????? String password = request.getParameter(