SpringMVC RestFul风格实现

@Controller
@RequestMapping("/HelloController")
public class HelloController {
    @RequestMapping("/add/{a}/{b}")
    public String sayHello(@PathVariable int a, @PathVariable int b, Model model) {
        model.addAttribute("msg", a + b);
        return "hello";
    }
}

@GetMapping
@PostMapping
@DeleteMapping
@PutMapping
// put方式是可以更新，但是更新的是整体，patch是对局部更新
@PatchMapping

public class HelloController {
    @PostMapping("/add/{a}/{b}")
    public String sayHello(@PathVariable int a, @PathVariable int b, Model model) {
        model.addAttribute("msg", a + b);
        return "hello";
    }
}