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ajax 登录

    博客分类：
  • ajax
AjaxServletJavaJavaScriptXML 
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  jsp页面

<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>
<%
 request.setCharacterEncoding("GBK");
 %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Ajax</title>
<script type="text/javascript" language="JavaScript">
   var xmlHttp;
   function createXMLHttpRequest()
   {
   try{
       xmlHttp=new XMLHttpRequest();
      }
      catch(e)
      {
      try
        {
        xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
        }
        catch(e)
        {
        try
          {
          xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
          }
          catch(e)
          {
          alert('您的浏览器不支持Ajax！');
          return false;
          }
        }
      }
   }
   function sendRequest(url)
     {
       createXMLHttpRequest();
       xmlHttp.open("GET",url,true);
       xmlHttp.onreadystatechange=processResponse;
       xmlHttp.send(null);
     }
    function processResponse()
    {
     if(xmlHttp.readyState==4)
     {
       if(xmlHttp.status==200)
       {
     var res=xmlHttp.responseText;<%--  xmlHttp.responseXML.getElementsByTagName("res")[0].firstChild.data;--%>
       window.alert(res);
       }
       else
       {
       window.alert("你请求的页面出现异常！");
       }
     }
    }
   function singUp()
   {
    var name=document.getElementById('username').value;
    var psw=document.getElementById('pwd').value;
    sendRequest('servlet/Ajax?uname='+name+'&pwd='+psw);
   }
   </script>
</head>
<body>
<form name="myForm" method="post" >
用户：<input id="username" name="username" type="text" /><br>
密码：<input id="pwd"  type="password" name="pwd"><br>
<input type="button" value="测试" onclick="singUp();">
</form>
</body>
</html>
AjaxServlet

package com.ajax;

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 Ajax extends HttpServlet {
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.setCharacterEncoding("gbk");
        response.setContentType("text/xml;charset=gbk");
        response.setHeader("Cache-Control","no-cache");
        String name=request.getParameter("uname");
        String pwd=request.getParameter("pwd");
        PrintWriter out=response.getWriter();
        if("name".equals(name)||"pwd".equals(pwd))
        {
          out.println("测试成功");
        }else
        {
            out.println("测试失败");
        }
       
    }
}

webxml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
    xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
  <servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>Ajax</servlet-name>
    <servlet-class>com.ajax.Ajax</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>Ajax</servlet-name>
    <url-pattern>/servlet/Ajax</url-pattern>
  </servlet-mapping>
</web-app>

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