Ajax小案例：验证表单中用户名是否可用

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需求：输入用户名判断是否存在此用户

创建表单index.jsp

<%--  Created by IntelliJ IDEA.  User: pc  Date: 17-4-21  Time: 下午5:15  To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" %><html><head>    <title>注册信息</title>    <script type='text/javascript' src='../js/jquery.min.js' charset='utf-8'></script>    <style>        .top {            margin-left: 800px;            margin-top: 200px;        }    </style>    <script type="text/javascript">        $(function () {            $(":input[name='username']").change(function () {                var name = $(this).val();                name = $.trim(name);//取出前后空格                if (name != "") {                    var url = "/Login_AServlet";                    var args = {"username": name, "time": new Date()};                    $.get(url, args, function (data) {                        $(".message").html(data)                    });                }            });        });    </script></head><body><div class="top">    <h1>信息注册</h1>    <form action="#" method="post">        用户名：<input type="text" name="username"><span class="message"> </span><br>        邮 箱：<input type="text" name="emile"><br>        性 别：<input type="radio" name="sex" value="男生" checked="checked">男生        <input type="radio" name="sex" value="女生">女生<br>        <input type="submit" value="登 录">    </form></div></body></html>

Login_AServlet.java

<%--  Created by IntelliJ IDEA.  User: pc  Date: 17-4-21  Time: 下午12:10  To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" %><html><head>    <script type='text/javascript' src='./js/jquery.min.js' charset='utf-8'></script>    <title>Title</title>    <script type="text/javascript">        $(function () {            $("a").click(function () {                var url = this.href;                var time = {"time": new Date()}                $.post(url, time, function (data) {                    var name = $(data).find("name").text();                    var age = $(data).find("age").text();                    var email = $(data).find("email").text();                    $(".html_").html("");                    $(".html_").append("<h2>姓名：" + name + "性别：" + age + "邮箱：" + email);                });                return false;            });        });    </script>    <title>Title</title></head><body><h1>学生信息：</h1><ul>    <li><a href="./xml_ajax/huan.xml">马小欢</a></li>    <li><a href="./xml_ajax/yun.xml">赵云</a></li>    <li><a href="./xml_ajax/ming.xml">小明</a></li></ul><h1 class="html_"></h1></body></html>

用户名存在

用户不存在

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