[JAVA] (Intellij) Hello World with Spring Boot


  1. In Intel iJ, "File"-> "New"-> "Project"
  2. Select "Spring Initializer" in the displayed New Project and click "Next".
  3. Enter "Group" and "Artifact" as appropriate. I want to deploy to the server, so select "War" for "Packaging" and click "Next"
  4. I want to create a web application, so check "Web" → "Spring Web" and click "Next"
  5. Enter "Project name" and "Project location" as appropriate, and click "Fisnish".
  6. Add the following to the automatically created Demo Application and execute.

I was addicted to the lack of @ RestController ...

package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
+ import org.springframework.web.bind.annotation.GetMapping;
+ import org.springframework.web.bind.annotation.RestController;

+ @RestController
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
+    @GetMapping("/hello")
+    public String sayHello() {
+        return "Hello World";
+    }

  1. When you access the URL below, "Hello World" should be displayed.


スクリーンショット 2020-07-26 12.53.06.png

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