获取请求数据返回json

我就是我 2024-03-26 17:41 192阅读 0赞

**目录**

一.GET获取路径参数

二.POST获取路径参数

--------------------

#### 一.GET获取路径参数 ####

RestFul风格的接口的参数是在请求路径上的。类似的：/user/1 这里的1就是id![edc026a76f214dacb9b337f0596b2e64.png][]

如果我们想获取这种风格的数据，可以使用@PathVariable来实现

**示范一**

要求这个ResuFu风格的接口，该接口可以根据id查询用户。测试接口： [http://localhost:8080/user/user/10][http_localhost_8080_user_user_10]

@RequestMapping(value = "/user/{id}",method = RequestMethod.GET)
    @ResponseBody
    public String findUserById(@PathVariable("id") Integer id){
        System.out.println("id="+ id);
        return "hello";
    }

**示范二**

如果这个接口想根据id和username查询用户。 测试接口： [http://localhost:8080/user/user/10][http_localhost_8080_user_user_10]/张三

@RequestMapping(value = "/user/{id}/{username}",method = RequestMethod.GET)
    @ResponseBody
    public String findUserById(@PathVariable("id") Integer id,@PathVariable("username") String username){
        System.out.println("id="+ id);
        System.out.println("username="+ username);
        return "hello";
    }

如果我们想要接收对象类型的数据或者集合，则需要采用非RestFul风格

**案例一：接收对象类型的数据**

@RequestMapping(value = "/users",method = RequestMethod.GET)
    @ResponseBody
    public User findUserById(User user){
        System.out.println(user.toString());
        return user;
    }

![4c05c54754f24aea8bbb2d9b95942015.png][]

**案例二：接收List集合**![063543593edc4b328a626739068e716e.png][]

**案例三：接收Map集合**

//这个地方需要加上@RequestBody
    @RequestMapping(value = "/users",method = RequestMethod.GET)
    @ResponseBody
    public Map<String,Integer> findUserById(@RequestBody Map<String,Integer> map){
        return map;
    }

![d738073ba37a4385b076ca26cb855513.png][]

#### 二.POST获取路径参数 ####

**示范一：直接获取数据**

/**
     * 直接获取数据
     * @return
     */
    @PostMapping("/getForm")
    public void getForm(String name,int age) {
        System.out.println("name="+name + " " + "age=" + age);
    }

![aa96da4811f0403ea3eae81f14caff14.png][]

**示范二：用对象获取Json**

/**
         * 用对象获取Json
         * @return
         */
        @PostMapping("/getObjectJson")
        public void getObjectJson(@RequestBody User user) {
            System.out.println(user.toString());
        }

![3bba83201bab42bdadce8bffe2680324.png][]

**示范三：获取List**

/**
     * 获取List
     * @return
     */
    @PostMapping("/getList")
    public void getList(@RequestBody List<User> users) {
        System.out.println(users.toString());
    }

![26dbbef056b8486c8489d0d530daa788.png][]

**实例四：获取 （Map）数据**

/**
     * 获取 （Map）数据
     * @return
     */
    @PostMapping("/getFormByMap")
    public void getFormByMap(@RequestBody Map<String, String> map) {
        System.out.println(map);
    }

![1b0be2b95f4c424eb2aebbe5a63b5627.png][]

--------------------

![f46ee1125edd45368f47c00ccbedbce0.jpeg][]

[edc026a76f214dacb9b337f0596b2e64.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/26/7b542a50a4b74e3aaff57ed110555506.png
[http_localhost_8080_user_user_10]: http://localhost:8080/user/user/10
[4c05c54754f24aea8bbb2d9b95942015.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/26/c426708d17ac4e648ee6c0821e1c26e6.png
[063543593edc4b328a626739068e716e.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/26/21215dd21bd849a593b0ba9b0d5d4a54.png
[d738073ba37a4385b076ca26cb855513.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/26/a47f5980bc1940b98e7e390cdf29f012.png
[aa96da4811f0403ea3eae81f14caff14.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/26/35dc16e473ed45d3ba0308ba1a875f79.png
[3bba83201bab42bdadce8bffe2680324.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/26/b777bb392c0d41b284e19153d519101f.png
[26dbbef056b8486c8489d0d530daa788.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/26/85129d8fea054d98b9c3858cab5d4575.png
[1b0be2b95f4c424eb2aebbe5a63b5627.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/26/4d3c8e19abf24dc689b709fbd5b223d6.png
[f46ee1125edd45368f47c00ccbedbce0.jpeg]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/26/3d5f4d112447405ea34939e66e1aec4f.png