REST风格的表现形式转化

• 传统风格资源描述形式

  • http://localhost/user/getById?id=1
  • http://localhost/user/saveUser

• REST风格描述形式

  • http://localhost/user/1

  • http://localhost/user

• 优点

  • 隐藏资源的访问行为，无法通过地址得知对资源是何种操作

  • 书写简化

• 按照REST风格访问资源时使用行为动作区分

  • http://localhost/users 查询全部用户信息 GET (查询)

  • http://localhost/users 添加用户信息 POST (添加)

  • http://localhost/users 修改用户信息 PUT (修改)

  • http://localhost/users/1 查询指定用户信息 GET (查询)

  • http://localhost/users/1 删除指定用户 DELETE (删除)

• 步骤

  • @RequestMapping的属性

    1. value（默认）: 设置请求访问路径
    2. method：http请求动作，标准动作(GET/POST/PUT/DELETE)

  • 设定http请求动作

    1. @RequestMapping(value = "/users",method = RequestMethod.POST)
    2. @GetMapping @PostMapping @PutMapping @DeleteMapping

  • 设定请求参数

    1. @RequestMapping(value = "/users/{id}",method = RequestMethod.DELETE)
    2. @GetMapping("/{id}")
    3. @PathVariable 绑定路径参数与形参名
    4. @RequestBody 用于接收JSON数据
    5. @RequestParam 用户接收url地址传参或表单传参

• 案例

@RestController
@RequestMapping("/users")
public class UserController {
    //@RequestMapping(value = "/users",method = RequestMethod.POST)
    @PostMapping
    public String save(@RequestBody User user){
        System.out.println("user save ..."+ user);
        return "{'module':user save}";
    }

    //@RequestMapping(value = "/users/{id}",method = RequestMethod.DELETE)
    @DeleteMapping("/{id}")
    public String delete(@PathVariable Integer id){
        System.out.println("user delete ..."+ id);
        return "{'module':user delete}";
    }

    //@RequestMapping(value = "/users",method = RequestMethod.PUT)
    @PutMapping
    public String update(@RequestBody User user){
        System.out.println("user update ..."+ user);
        return "{'module':user update}";
    }

    //@RequestMapping(value = "/users/{id}",method = RequestMethod.GET)
    @GetMapping("/{id}")
    public String getById(@PathVariable Integer id){
        System.out.println("user getById ..."+ id);
        return "{'module':user getById}";
    }

    //@RequestMapping(value = "/users",method = RequestMethod.GET)
    @GetMapping
    public String getAll(){
        System.out.println("user getAll ...");
        return "{'module':user getAll}";
    }
}