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";

    }

}

最好加上@RequestParam(value="val",required=false)

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