使用ajax对用户注册时，用户名进行检验

package cn.hopetesting.com.servlet;2901583663

import com.fasterxml.jackson.databind.ObjectMapper;

import javax.print.attribute.standard.JobOriginatingUserName;
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;
import java.util.HashMap;
import java.util.Map;

/**
 * @author newcityman
 * @date 2019/9/18 - 21:49
 */
@WebServlet("/findUserServlet")
public class FindUserServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
          response.setContentType("application/json;charset=utf-8");
//          response.setContentType("text/html;charset=utf-8");
          //1、获取参数username
        String username = request.getParameter("username");
        //2、调用service层判断用户名是否存在
        //期望服务器响应回的数据格式：{
        //("userExist:true,"msg","此用户名太受欢迎，请更换一个")，
        // ("userExist:false,"msg","此用户名可用")}
        Map<String,Object> map = new HashMap<String,Object>();
        if("tom".equals(username)){
            //存在
            map.put("userExist",true);
            map.put("msg","此用户名太受欢迎，请更换一个");
        }else{
            //不存在
            map.put("userExist",false);
            map.put("msg","此用户名可用");
        }
        //将map转换为json，并且传递给客户端
        //将map转为json
        ObjectMapper mapper = new ObjectMapper();
        //并且传递给客户端
        mapper.writeValue(response.getWriter(),map);

    }

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

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>register</title>
    <script src="js/jquery-3.3.1.min.js"></script>
    <script>
        //页面加载完成后
       $(function () {
           //给username绑定blur时间
           $("#username").blur(function () {
               //获取username文本输入框的值
               var username = $(this).val();
               //发送ajax请求
               //期望服务器响应回的数据格式：{
               //("userExist:true,"msg","此用户名太受欢迎，请更换一个")，
               // ("userExist:false,"msg","此用户名可用")}
               $.get("findUserServlet",{username:username},function (data) {
                  //判断userExist键的值是否存在

                   var span = $("#s_username");
                   if(data.userExist){
                       //存在
                       span.css("color","red");
                       span.html(data.msg);
                   }else{
                       //不存在
                       span.css("color","green");
                       span.html(data.msg);
                   }
               }/*,"json"*/);
           });
       });
    </script>
</head>
<body>
      <input type="text" id="username" name="username" placeholder="请输入用户名">
      <span id="s_username"></span><br/>
      <input type="password" id="password" name="passowrd" placeholder="请输入密码"><br/>
      <input type="submit" value="提交">
</body>
</html>

package cn.hopetesting.com.servlet;2901583663

import com.fasterxml.jackson.databind.ObjectMapper;

import javax.print.attribute.standard.JobOriginatingUserName;
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;
import java.util.HashMap;
import java.util.Map;

/**
 * @author newcityman
 * @date 2019/9/18 - 21:49
 */
@WebServlet("/findUserServlet")
public class FindUserServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
          response.setContentType("application/json;charset=utf-8");
//          response.setContentType("text/html;charset=utf-8");
          //1、获取参数username
        String username = request.getParameter("username");
        //2、调用service层判断用户名是否存在
        //期望服务器响应回的数据格式：{
        //("userExist:true,"msg","此用户名太受欢迎，请更换一个")，
        // ("userExist:false,"msg","此用户名可用")}
        Map<String,Object> map = new HashMap<String,Object>();
        if("tom".equals(username)){
            //存在
            map.put("userExist",true);
            map.put("msg","此用户名太受欢迎，请更换一个");
        }else{
            //不存在
            map.put("userExist",false);
            map.put("msg","此用户名可用");
        }
        //将map转换为json，并且传递给客户端
        //将map转为json
        ObjectMapper mapper = new ObjectMapper();
        //并且传递给客户端
        mapper.writeValue(response.getWriter(),map);

    }

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

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>register</title>
    <script src="js/jquery-3.3.1.min.js"></script>
    <script>
        //页面加载完成后
       $(function () {
           //给username绑定blur时间
           $("#username").blur(function () {
               //获取username文本输入框的值
               var username = $(this).val();
               //发送ajax请求
               //期望服务器响应回的数据格式：{
               //("userExist:true,"msg","此用户名太受欢迎，请更换一个")，
               // ("userExist:false,"msg","此用户名可用")}
               $.get("findUserServlet",{username:username},function (data) {
                  //判断userExist键的值是否存在

                   var span = $("#s_username");
                   if(data.userExist){
                       //存在
                       span.css("color","red");
                       span.html(data.msg);
                   }else{
                       //不存在
                       span.css("color","green");
                       span.html(data.msg);
                   }
               }/*,"json"*/);
           });
       });
    </script>
</head>
<body>
      <input type="text" id="username" name="username" placeholder="请输入用户名">
      <span id="s_username"></span><br/>
      <input type="password" id="password" name="passowrd" placeholder="请输入密码"><br/>
      <input type="submit" value="提交">
</body>
</html>

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