第一天springboot学习笔记

1.controller里注解的写法

 1.1基础写法

@Controller//引用Controller
public class helloController {
    @RequestMapping(value = "/users",method = RequestMethod.GET)//请求头以及请求方式
    @ResponseBody//相应主体
    public String save(){
    System.out.println("user save...");
    return "{'module':'user save'}";
    };

    @RequestMapping(value = "/users/{id}",method = RequestMethod.DELETE)
    //如果有参即可在请求头加入腰穿的参数同时需要在方法里加入@PathVariable
    @ResponseBody
    public String delete(@PathVariable Integer id){
        System.out.println("user delete..."+id);
        return "{'module':'user delete'}";
    };

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

 1.2简化写法

@RestController
//将@Controller与 @ResponseBody简化成一个
@RequestMapping("/books")
//直接开头加入请求头
public class jianhua {
    //简化版本的 @RequestMapping(value = "/users",method = RequestMethod.GET)
    @GetMapping
    public String save(){
        System.out.println("user save...");
        return "{'module':'user save'}";
    };
    //简化版本的 @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'}";
    };

    @PutMapping("/{id}")
    public String update(@PathVariable Integer id) {
        System.out.println("user update..." + id);
        return "{'module':'user update'}";
    }
}