环境

• Mac
• Idea
• jdk1.8
• Maven 3.8.6

第一步

File ->New -> Project 选择 Spring Initializr

第二步

打开 src -> main -> java -> com.learn.demo 新建 controller package,在 controller包目录下新建PingController

package com.learn.demo.controller;

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

@RestController
public class PingController {

    @GetMapping("/ping")
    public String ping() {
        return "Hello World!";
    }

}

点击右上角启动按钮，访问localhost:8080/ping