• @RequestMapping 和@ResponseBody 和 @RequestBody和@PathVariable 注解 注解用法


    接下来讲解一下 @RequestMapping  和@ResponseBody 和 @RequestBody和@PathVariable 注解 注解用法

    @RequestMapping 为url映射路径

    @ResponseBody  将数据以json数据返回ajax的回掉方法

    @RequestBody  将url的参数以实体形式传入action

    @PathVariable 注解  分解resultful的风格

    jsp源码

    <%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>

    <!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">
    <title>Insert title here</title>
    </head>
    <script type="text/javascript" src="js/jquery-1.5.js"></script>
    <script type="text/javascript">

    function findStudentInfo() {
    debugger
    $.ajax({
    type:"get",
    url:"${pageContext.request.contextPath}/getemps",
    dataType:"json",
    success : function (data) {
    debugger
    $("#showMessageDiv").empty();
    $("#showMessageDiv").append("<table id='table1'></table>");
    $("#table1").append("<tr><td>员工ID</td><td>姓名</td><td>性别</td><td>邮箱地址</td></tr>");
    $.each(data,function (i,result) {
    var sex="女"
    if (result.gender==1){sex="男"}
    var item="<tr><td>"+result.id+"</td><td>"+result.lastName+"</td><td>"+sex+"</td><td>"+result.email+"</td>";
    $("#table1").append(item);
    });

    },
    error:function(){
    alert("错误");
    }
    });
    }

    function findStudentInfo1() {
    debugger
    var datas ='{"id":" 1","email":"123@11.com "}';
    $.ajax({
    type : 'POST',
    contentType : 'application/json',
    url : "${pageContext.request.contextPath}/getemps1",
    dataType : 'json',
    data : datas,
    success : function(data){
    $("#showMessageDiv").empty();
    $("#showMessageDiv").append("<table id='table1'></table>");
    $("#table1").append("<tr><td>员工ID</td><td>姓名</td><td>性别</td><td>邮箱地址</td></tr>");
    var sex="女"
    if (data.gender==1){sex="男"}
    var item="<tr><td>"+data.id+"</td><td>"+data.lastName+"</td><td>"+sex+"</td><td>"+data.email+"</td>";
    $("#table1").append(item);
    },
    error : function()
    {
    alert('Sorry, it is wrong!');
    }
    });
    }
    function findStudentInfo2() {
    debugger
    var datas ='{"id":" 1","email":"jerry1@atguigu.com"}';
    $.ajax({
    contentType : 'application/json',
    type : 'POST',
    url:"${pageContext.request.contextPath}/getemps2",
    dataType:"json",
    data : datas,
    success : function (data) {
    debugger
    $("#showMessageDiv").empty();
    $("#showMessageDiv").append("<table id='table1'></table>");
    $("#table1").append("<tr><td>员工ID</td><td>姓名</td><td>性别</td><td>邮箱地址</td></tr>");
    $.each(data,function (i,result) {
    var sex="女"
    if (result.gender==1){sex="男"}
    var item="<tr><td>"+result.id+"</td><td>"+result.lastName+"</td><td>"+sex+"</td><td>"+result.email+"</td>";
    $("#table1").append(item);
    });

    },
    error:function(){
    alert("错误");
    }
    });
    }
    function findStudentInfo3() {
    debugger
    $.ajax({
    type : 'POST',
    contentType : 'application/json',
    url : "${pageContext.request.contextPath}/getemps3?id=1",
    dataType : 'json',
    success : function(data){
    $("#showMessageDiv").empty();
    $("#showMessageDiv").append("<table id='table1'></table>");
    $("#table1").append("<tr><td>员工ID</td><td>姓名</td><td>性别</td><td>邮箱地址</td></tr>");
    var sex="女"
    if (data.gender==1){sex="男"}
    var item="<tr><td>"+data.id+"</td><td>"+data.lastName+"</td><td>"+sex+"</td><td>"+data.email+"</td>";
    $("#table1").append(item);
    },
    error : function()
    {
    alert('Sorry, it is wrong!');
    }
    });
    }
    function findStudentInfo4() {
    debugger
    $.ajax({
    type : 'POST',
    contentType : 'application/json',
    url : "${pageContext.request.contextPath}/testPathVariable/4",
    dataType : 'json',
    success : function(data){
    $("#showMessageDiv").empty();
    $("#showMessageDiv").append("<table id='table1'></table>");
    $("#table1").append("<tr><td>员工ID</td><td>姓名</td><td>性别</td><td>邮箱地址</td></tr>");
    var sex="女"
    if (data.gender==1){sex="男"}
    var item="<tr><td>"+data.id+"</td><td>"+data.lastName+"</td><td>"+sex+"</td><td>"+data.email+"</td>";
    $("#table1").append(item);
    },
    error : function()
    {
    alert('Sorry, it is wrong!');
    }
    });
    }
    </script>
    <body>

    <div id="showMessageDiv">
    </div>
    <div id="data">
    <input type="button" value="返回list" onclick="findStudentInfo()"/>
    <input type="button" value="返回实体以RequestBody接受参数" onclick="findStudentInfo1()"/>
    <input type="button" value="返回list以RequestBody接受参数" onclick="findStudentInfo2()"/>
    <input type="button" value="返回实体以Requestparam接受参数" onclick="findStudentInfo3()"/>
    <input type="button" value="返回实体以testPathVariable接受参数" onclick="findStudentInfo4()"/>
    </div>
    </body>
    </html>

    2 action源码

    package com.atguigu.mybatis.controller;

    import java.io.IOException;
    import java.util.List;

    import org.codehaus.jackson.JsonGenerationException;
    import org.codehaus.jackson.map.JsonMappingException;
    import org.codehaus.jackson.map.ObjectMapper;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.RequestBody;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.bind.annotation.ResponseBody;

    import com.atguigu.mybatis.bean.Employee;
    import com.atguigu.mybatis.service.EmployeeService;

    @Controller
    public class EmployeeController {

    @Autowired
    EmployeeService employeeService;

    @RequestMapping("/getemps")
    @ResponseBody
    public String empsList() throws JsonGenerationException, JsonMappingException, IOException{
    List<Employee> emps = employeeService.getEmps();
    ObjectMapper mapper= new ObjectMapper();
    String jsonStr = mapper.writeValueAsString(emps );
    return jsonStr;
    }
    @RequestMapping("/getemps1")
    @ResponseBody
    public Employee emps(@RequestBody Employee e) throws JsonGenerationException, JsonMappingException, IOException{
    Employee e1=employeeService.getEmpById(e.getId());
    return e1;
    }

    @RequestMapping("/getemps2")
    @ResponseBody
    public String empsListbyemail(@RequestBody Employee e) throws JsonGenerationException, JsonMappingException, IOException{
    List<Employee> emps = employeeService.getEmpByemail(e.getEmail());
    ObjectMapper mapper= new ObjectMapper();
    String jsonStr = mapper.writeValueAsString(emps );
    return jsonStr;
    }

    @RequestMapping("/getemps3")
    @ResponseBody
    public Employee emps(@RequestParam(value = "id") Integer id) throws JsonGenerationException, JsonMappingException, IOException{
    Employee e1=employeeService.getEmpById(id);
    return e1;
    }
    @RequestMapping("/testPathVariable/{id}")
    @ResponseBody
    public Employee testPathVariableemps(@PathVariable("id") Integer id) throws JsonGenerationException, JsonMappingException, IOException{
    Employee e1=employeeService.getEmpById(id);
    return e1;
    }
    }

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  • 原文地址:https://www.cnblogs.com/zhangzhiqin/p/8491428.html
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