SpringBoot：第一篇 新建spring boot 应用

package com.example.demo.controller;
/**
 * @author duanxiaoqiu
 * @Date 2019-06-14 15:05
 **/
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
@RequestMapping("/")
public class TestController {
    @RequestMapping("/")
    @ResponseBody
    public String index(){
        //log.info("++++");
        return "hello world";
    }
}