[JAVA] "Teacher, I want to implement a login function in Spring" ① Hello World


1,HelloWorld 2, login form 3, data storage 4, login


Download STS If you get lost Introducing Spring Tool Suite to Windows-Qiita

Creating a project

1,File⇒New⇒Spring Starter Project 1.jpg 1,「Name」=「HelloWorld」 2,「Package」=「com.login」 2.jpg 1,Web⇒Spring Web 3.jpg

Class creation

1, Right-click on "com.login". New⇒Class 4.jpg 1、「Name」=「HomeController」 5.jpg

1, Overwrite the following in the created class


package com.login;

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

public class HomeController {
	public String home(Model model) {
		model.addAttribute("hello","Hello World!");
		return "hello";

1, Add the following to pom.xml




Create HTML file

1, src / main / resources Right click on "templates". New⇒Other 6.jpg

  1. Enter "html".

  2. Select "HTML File". 7.jpg 1、「File name」=「hello.html」 8.jpg

  3. Overwrite the following in the created "hello.html".


<!DOCTYPE html>
<meta charset="UTF-8">
<title>Insert title here</title>
	<h1 th:text="${hello}"></h1>


Right click on the project "Hello World". "Run As" ⇒ "Spring Boot App" 9.jpg 1, enter on the browser ⇒ "localhost: 8080 / hello" WS000003.JPG


Teacher: (The result is the same as writing "Hello World" in a file with an html extension, but you will notice the great potential by scratching the server side.) Takashi: Teacher, isn't this the same as writing "Hello World" in a file with an html extension? teacher:··· By running the server, it will display the number of 30 billion or anything in order from 1. With the human brain, you can create and decipher codes that take time to understand. What's more, you can even display practice sentences to become "AHO" when the numbers are multiples of 3 and numbers with 3!


    public String home(Model model) {
    	List<String> aho=new ArrayList<String>();
    	int a,b,c;
    	for(int i=1;i<=1000;i++) {
    		if(i%3==0 || i%10==3 || a%10==3|| b%10==3||c%10==3) {
    	model.addAttribute("hello", aho);
        return "hello";

Confirmation of what you did

① Create Java project (Spring) (2) Create Controller class (perform mapping) ③ Create Html file (use server side function) ④ Edit the project configuration file (Maven xml) ⑤ Web page display using Web server software (apache)

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