第一个 Spring Boot 程序 : 构建 RESTful 服务

把我们基础的项目来升级一点点，还是照着文档来 https://spring.io/guides/gs/rest-service/

web.xml 没有变化

项目分成了几个包



 实体类 Greeting

public class Greeting {

private final long id;
private final String content;

public Greeting(long id, String content) {
this.id = id;
this.content = content;
}

public long getId() {
return id;
}

public String getContent() {
return content;
}

}


controller

import java.util.concurrent.atomic.AtomicLong;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import com.lzf.bean.Greeting;

@RestController
public class GreetingController {

private static final String template = "Hello, %s !";
private final AtomicLong counter = new AtomicLong();

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


 main 函数

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application {

public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}

}


运行 http://localhost:8080/greeting   ---->   {"id":1,"content":"Hello, World !"}
http://localhost:8080/greeting?name=user  ---> {"id":2,"content":"Hello, user !"}

确实方便，没写一个xml