Spring

spring is a java framework to handle web pages

Spring MVC In a typical Spring MVC application, @Controller classes are responsible for preparing a model map with data and selecting a view to be rendered. This model map allows for the complete abstraction of the view technology and, in the case of Thymeleaf, it is transformed into a Thymeleaf context object (part of the Thymeleaf template execution context) that makes all the defined variables available to expressions executed in templates.

Thymeleaf is a modern server-side Java template engine for both web and standalone environments.

Thymeleaf’s main goal is to bring elegant natural templates to your development workflow — HTML that can be correctly displayed in browsers and also work as static prototypes, allowing for stronger collaboration in development teams.

With modules for Spring Framework, a host of integrations with your favourite tools, and the ability to plug in your own functionality, Thymeleaf is ideal for modern-day HTML5 JVM web development — although there is much more it can do.

Create a simple web page using spring

to create simple project navigate to start Spring Project click generate then unzip the file that had been downloaded then open it using your IDE (IntelliJ for example)

create class called GreetingComtroller.java and add the following code inside it.

package com.example.servingwebcontent;


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

@Controller
public class GreetingController {

    @GetMapping("/greeting")
    public String greeting(@RequestParam(name="name", required=false, defaultValue="World") String name, Model model) {
        model.addAttribute("name", name);
        return "greeting";
    }

}

this class will handle the /greeting when ever it requested with a single parameter name and if the name parameter not passed default parameter will be set which is World.

and to add html pages navigate to recources then templates and add html file called greeting.htmlwith the following code in side it

<!DOCTYPE HTML>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <title>Getting Started: Serving Web Content</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>
<p th:text="'Hello, ' + ${name} + '!'"></p>
</body>

Now to run the web page do the following:

build the project using ./gradlew build
after build is done a jar file will be created inside the build/libs/ directory, to run this file use this command java -jar build/libs/serving-web-content-0.0.1-SNAPSHOT.jar make sure that the file name of jar is the same name, else change it accordingle to yours.
now the code server is runing open your browser and type http://localhost:8080/greeting, a page with text Hello, World! will be opened

to change the “World” word add name parameter with the value you want as this http://localhost:8080/greeting?name=AbdalQader and the text will changed to Hello, AbdalQader!.