SpringMVC restful

@Controller       控制层
@Service         业务层
@Component    组件
@Repository     dao

package com.wt.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

// 控制注解
@Controller
public class HelloControl {
    @RequestMapping("/add")
    public String showHi(int a, int b, Model model){
        String result = "结果是:" + (a + b);
        model.addAttribute("msg", result);
        return "hi";
    }
}

// 控制注解
@Controller
public class HelloControl {
    @RequestMapping("/add/{a}/{b}")
    public String showHi(@PathVariable int a, @PathVariable int b, Model model){
        String result = "结果是:" + (a + b);
        model.addAttribute("msg", result);
        return "hi";
    }
}

// 控制注解
@Controller
public class HelloControl {
//    @RequestMapping(name="/add/{a}/{b}", method = RequestMethod.GET)
    @GetMapping("/add/{a}/{b}")
    public String showHi(@PathVariable int a, @PathVariable int b, Model model){
        String result = "结果是:" + (a + b);
        model.addAttribute("msg", result);
        return "hi";
    }
}

@PostMapping()
@PutMapping()
@DeleteMapping()