jqury的ajax

前端代码：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script type="text/javascript" src="${pageContext.request.contextPath }/js/jquery-1.8.3.js"></script>
<script type="text/javascript">
    function checkIn(){
        var val=$("#listAllEmp").val();//#必须带上
        console.log(val)
        $.ajax({
            url:'${pageContext.request.contextPath }/checkInOut/checkIn.do',//传入的路径+key
            type:'GET',//使用get请求，如果用post，值写在data里
            data:{val:val},//option的值传入后台
            dataType:'text',//返回的数据类型，就是后台返回回来的类型，可以是html，或xml
            async:true,//使用异步方式
            success:function(data){//成功后返回值data
                alert(data)
            },
            error:function(){//失败的处理
            },
            });
    }
    
</script>
<title>签到签退</title>
</head>
<body>
    <select id="listAllEmp" name="listAllEmp">
    <option value="1">--------请选择-------</option>
        <c:forEach items="${employees}" var="emp">
            <option value="${emp.id }">
                ${emp.name}
            </option>
        </c:forEach>
    </select>
    <button id="checkIn" name="checkIn" onclick="checkIn()">签到</button>
</body>
</html>

后端代码

package com.bike.servlet;

import java.util.List;

import javax.annotation.Resource;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import com.bike.domain.Employee;
import com.bike.service.EmpTimeService;

@Controller
@RequestMapping("/checkInOut")
public class CheckInOutController {
    //先展示所有员工
    @Resource
    EmpTimeService empTimeService;
    public void setEmpTimeService(EmpTimeService empTimeService) {
        this.empTimeService = empTimeService;
    }

    @RequestMapping("/listAllEmp")
    public String listAllEmp(Model model) {
        System.out.println("执行1");
        List<Employee> employees=empTimeService.listAllEmp();
        model.addAttribute("employees", employees);
        return "checkInOut";
    }
    
}

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