RestFul风格

RestFul风格就是一个资源定位和资源操作的风格，基于这种风格设计的软件可以更加简洁，更有层次，更容易实现缓存等机制
1.常规请求风格

@Controller
public class RestFulController {

   // 原始：//http://localhost:8080/springmvc_04_controller_war_exploded/add?a=1&b=3
    @RequestMapping("/add")
    public String restFul( int a, int b, Model model){

        int res=a+b;
        model.addAttribute("msg","结果为："+res);
        return "test";
    }
}

2.RestFul风格

@Controller
public class RestFulController {


//restFul http://localhost:8080/springmvc_04_controller_war_exploded/add/1/3
    @RequestMapping( "/add/{a}/{b}")
    public String restFul(@PathVariable int a, @PathVariable int b, Model model){

        int res=a+b;
        model.addAttribute("msg","结果为："+res);
        return "test";
    }
}

使用：参数用@PathVariable来注解，RequestMapping中将参数用{}加上

3.使用不同的方法（post,get,delete…）提交

@Controller
public class RestFulController {
    @RequestMapping(value = "/add/{a}/{b}",method = RequestMethod.DELETE)
    public String restFul(@PathVariable int a, @PathVariable int b, Model model){

        int res=a+b;
        model.addAttribute("msg","结果为："+res);
        return "test";
    }
}

再RequestMapping中，加上method属性值
或者，直接将RequestMapping改用以下值：

@GetMapping
@PostMapping
@PutMapping
@DeleteMapping
@PatchMapping