Spring 注解学习

    @GetMapping(value = "/hello/{id}")//需要获取Url=localhost:8080/hello/id中的id值
    public String sayHello(@PathVariable("id") Integer id){
        return "id:"+id;
    }
    @GetMapping(value="/hello/{id}/{name}")//需要在url有多个参数需要获取
    public String sayHello(@PathVariable("id") Integer id,@PathVariable("name") String name){
        return "id:"+id+" name:"+name;
    }
    @GetMapping(value="/hello")//localhost:8080/hello?id=98,@RequestParam 获取请求参数的值
    public String hello(@RequestParam("id") Integer id,@RequestParam("access_token")String accessToken){
        return "id:"+id+"   accessToken:"+accessToken;
    }
    @GetMapping(value="/hello1")//我们在浏览器中输入地址：localhost:8080/hello ,即不输入id参数，则报错  Required Integer parameter 'id' is not present
    //可以添加默认参数
    public String hello1(@RequestParam(value = "id",required = false,defaultValue = "1") Integer id,@RequestParam("access_token")String accessToken){
        return "id:"+id+"   accessToken:"+accessToken;
    }