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$.ajax邮箱验证

package com;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(name = "emailServlet",urlPatterns = "/emailServlet")
public class emailServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        super.doGet(req, resp);
        this.doPost(req,resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("utf-8");
        resp.setContentType("text/html;charset=utf-8");
        resp.setCharacterEncoding("utf-8");
        String email = req.getParameter("email");
        System.out.println(email);
        boolean flag = false;
        if(email.equals("1391614208@qq.com")){
            resp.getWriter().print("true");
        }else{
            resp.getWriter().print("false");
        }
    }
}

emailServlet

<%--
  Created by IntelliJ IDEA.
  User: SuSh1
  Date: 2019/10/17
  Time: 8:25
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <script src="js/jquery-1.12.4.min.js"></script>
    <%
        String contextPath = request.getContextPath();
        request.setAttribute("contextPath",contextPath);
    %>
    <script type="text/javascript">
        function getXMLhttp() {
            if (window.XMLHttpRequest){
                return new XMLHttpRequest();
            } else if (window.ActiveXObject){
                return new ActiveXObject("Microsoft.XMLHTTP");
            }
        }
        function kgc(){
            var email = $("#email").val();
            if(email == null || email == ""){
                $("#emailId").html("邮箱不能为空");
            }else{
                xmlhttp = getXMLhttp();
                var url = "${contextPath}/emailServlet";
                var info = "email="+email;
                $(function () {
                    $.ajax({
                        "url":url,
                        "type":"POST",
                        "data":info,
                        "dataType":"text",
                        "success":ifsuccess ,
                        "error":function () {
                            alert("请联系系统管理员");
                        }

                    })

                })
                function ifsuccess(data) {
                    if(data=="true"){
                        //$("#emailId").html("邮箱不可用");
                        document.getElementById("emailId").innerText = "邮箱不可用";
                        //$("#emailId").html("邮箱不可用");

                    }else{
                        $("#emailId").html("邮箱可用");

                    }

                }
            }
        }
    </script>
    <title>验证email</title>
</head>
<body>
<form action="" method="post">
    邮箱：<input type="email" name="email" id="email" placeholder="请输入有效邮箱：" onblur=" kgc();">
    <input type="submit" value="提交">
    <div id="emailId" style="display: inline"></div>
</form>

</body>
</html>

email.jsp

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原文地址：https://www.cnblogs.com/lev1/p/11692639.html