SpringMVC —— RESTful入门

RESTful入门案例

  1、设定http请求动作（动词）

    @RequestMapping(value = "/users",method = RequestMethod.POST)
    @ResponseBody
    public String save(){
        System.out.println("user save..." );
        return "{'module':'user save and add'}";
    }

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

  2、设定请求参数（路径变量）

  

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

 

注解

  

  

@RequestBody @RequestParam @PathVariable 区别

• 区别
  • @RequestParam用于接收url地址传参或表单传参
  • @RequestBody用于接收json数据
  • @PathVariable用于接收路径参数，使用{参数名称}描述路径参数
• 应用
  • 后期开发中，发送请求参数超过1万个时，以json格式为主，@RequestBody应用广泛
  • 如果发送非json格式数据，选用@RequestParam接收请求参数
  • 采用RESTful进行开发，当参数数量较少时，例如1个，可以采用@PathVariable接收请求路径变量，通常用于传递id值

 

RESTful快速开发

@RestController
@RequestMapping("books")
public class BookController {
    @PostMapping
    public String save(){
        System.out.println("book save..." );
        return "{'module':'book save and add'}";
    }

    @DeleteMapping("/{id}")
    public String delete(@PathVariable Integer id){
        System.out.println("book delete..." + id);
        return "{'module':'book delete'}";
    }

    @PutMapping
    public String update(@RequestBody Book book){
        System.out.println("book update..." + book);
        return "{'module':'book update'}";
    }

    @GetMapping("/{id}")
    public String getById(@PathVariable Integer id){
        System.out.println("book getById..." + id);
        return "{'module':'book getById'}";
    }

    @GetMapping
    public String getByAll(){
        System.out.println("book getByAll...");
        return "{'module':'book getByAll'}";
    }
}

  注解