Jsp Ajax之模拟用户注册
【摘要】
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request...
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
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<%
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String path = request.getContextPath();
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String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
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%>
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<base href="<%=basePath%>">
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<title>My JSP 'regUser.jsp' starting page</title>
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<meta http-equiv="pragma" content="no-cache">
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<meta http-equiv="cache-control" content="no-cache">
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<meta http-equiv="expires" content="0">
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<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
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<meta http-equiv="description" content="This is my page">
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<script type="text/javascript">
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var xhr;
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//创建Xhr对象的函数;
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function createXhr(){
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try{
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//普通方式;
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return new XMLHttpRequest();
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}catch(e){
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//异常，则另外一种方式;
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return new ActiveXObject("Microsoft.XMLHTTP");
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}
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}
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//用户名，文本框失去焦点处理函数;
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function checkUser(){
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xhr=createXhr();
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//得到文本框中输入的内容；
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var username=document.getElementById("username").value;
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//设置回调函数;
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xhr.onreadystatechange=callback;
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//alert(username);
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//设置请求方式和url，因为是get方式，请求数据直接在url的后面;
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xhr.open("get","checkUserAction?username="+username);
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//发送请求;
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xhr.send(null);
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}
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function callback(){
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//判断请求完成，并且成功返回;
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if(xhr.readyState==4&&xhr.status==200){
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var msg=document.getElementById("msg");
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var res=xhr.responseText;
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//alert(res);
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//根据响应返回的数据，进行页面更新;
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if(res=="true"){
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msg.innerHTML='用户名已经存在';
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}else{
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msg.innerHTML='用户名可以注册';
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}
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}
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}
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</script>
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</head>
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<body>
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<form action="regAction" method="post">
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账户：<input type='text' id='username' name='username' οnblur='checkUser()'/><span id='msg'></span><br/>
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密码:<input type='password' name='userpwd'><br/>
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邮箱：<input type='text' name='email'><br/>
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地址:<input type='text' name='address'><br/>
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<input type='submit' value='注册'/>
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</form>
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</body>
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</html>
响应的Servlet代码:
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package web;
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import java.io.IOException;
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import java.io.PrintWriter;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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public class CheckUserServlet extends HttpServlet {
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@Override
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protected void doGet(HttpServletRequest req, HttpServletResponse resp)
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throws ServletException, IOException {
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resp.setContentType("text/html;charset=utf-8");
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PrintWriter out=resp.getWriter();
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//获取提交数据;
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String username=req.getParameter("username");
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if("admin".equals(username)){
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out.print("true");
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}else{
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out.print("false");
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}
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out.close();
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}
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@Override
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protected void doPost(HttpServletRequest req, HttpServletResponse resp)
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throws ServletException, IOException {
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this.doGet(req, resp);
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}
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}
文章来源: aaaedu.blog.csdn.net，作者：tea_year，版权归原作者所有，如需转载，请联系作者。
原文链接：aaaedu.blog.csdn.net/article/details/53243042
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