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Spring Boot勉強② Hello World

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はじめに

前回の続き、プロジェクト作成後にThymeleafを用いてHello Worldを表示させるまでを行う

を参考に実施

目次

  1. パッケージ構成
  2. HTML,Controllerの作成
  3. Spring Bootプロジェクトの起動
  4. HTML,Controllerの関係性
  5. 参考文献

パッケージ構成

image.png

HTML,Controllerの作成

①「resources」-「templates」配下にindex.htmlを作成
※「resources」-「templates」フォルダ配下が参照されるのはThymeleafのデフォルト、変更も可

index.html
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org">
  <head>
    <title>Hello</title>
    <meta charset="utf-8" />
  </head>
  <body>
    <h1>任意タイトル</h1>
    <h2><span th:text="${message}"></span></h2>
  </body>
</html>

②com.example.demo.controllerパッケージ配下にHelloWorldController.javaを作成

HelloWorldController.java
package com.example.demo.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
public class HelloWorldController {
    @RequestMapping(value = "/", method = RequestMethod.GET)
    public String helloWorld(Model model) {
        model.addAttribute("message", "Hello World!!");
        return "index";
    }
}

Spring Bootプロジェクトの起動

①プロジェクトを右クリック→「実行」→「Spring boot アプリケーション」を選択してSpring Bootプロジェクトを起動
②ブラウザで「http://localhost:8080/」にアクセス

image.png

HTML,Controllerの関係性

アノテーションを基にRequestに応じてControllerのメソッドを実行し、returnで指定されたページに遷移する
image.png

参考文献

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