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package com.example.restservice;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.util.concurrent.atomic.AtomicLong;

@RestController

//Spring’s approach to building RESTful web services, HTTP requests are handled by a controller. These components are identified by the @RestController annotation, and the GreetingController
//This code uses Spring @RestController annotation, which marks the class as a controller where every method returns a domain object instead of a view. It is shorthand for including both @Controller and @ResponseBody.

public class GreetingController {
        
    private static  final;
    String template = "Hello,%s!";

    private  final AtomicLong counter = new AtomicLong(); 

    @GetMapping("/greeting")  //get方法 GET requests for /greeting,
    The @GetMapping annotation ensures that HTTP GET requests to /greeting are mapped to the greeting() method.
    @GetMapping注释确保对greeting()方法的HTTP GET请求被映射到greeting()方法。


     其他HTTP动词也有相应的注释(例如@PostMapping用于POST)。还有一个@RequestMapping注释，它们都是从这个注释派生出来的，可以作为同义词(例如@RequestMapping(method=GET))。


    public  Greeting greeting(@RequestParam(value = "name",defaultValue ="ShenXiaoDao") String name){   
        return new Greeting(counter.incrementAndGet(),String.format(template,name));
    }
}