spring-boot/spring-boot-hello/src/main/java/com/neo/controller/HelloController.java

package com.neo.controller;

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

@RestController
public class HelloController {
	
    @RequestMapping("/")
    public String index() {
        return "Hello Spring Boot 2.0!";
    }
}