Chủ Nhật, 12 tháng 11, 2017

Spring boot: hello world + thymeleaf

By thelam92 03:54
In this post, i am going to demo spring boot using tomcat (embed) and thymeleaf template engine.

Tools:
- spring tool suite (STS): Version: 3.9.1.RELEASE
- maven 3.5
- spring boot version 1.5.8
- Thymeleaf templating engine, including integration with Spring.

Step1: create new spring starter project





Structure of project after create.


Pom.xml (auto generate for us)
<?xml version="1.0" encoding="UTF-8"?>  
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
      xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">  
      <modelVersion>4.0.0</modelVersion>  
      <groupId>com.shine2share</groupId>  
      <artifactId>springboot_demo1</artifactId>  
      <version>0.0.1-SNAPSHOT</version>  
      <packaging>jar</packaging>  
      <name>springboot_demo1</name>  
      <description>Building project by spring boot</description>  
      <parent>  
           <groupId>org.springframework.boot</groupId>  
           <artifactId>spring-boot-starter-parent</artifactId>  
           <version>1.5.8.RELEASE</version>  
           <relativePath/> <!-- lookup parent from repository -->  
      </parent>  
      <properties>  
           <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>  
           <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>  
           <java.version>1.8</java.version>  
      </properties>  
      <dependencies>  
           <dependency>  
                <groupId>org.springframework.boot</groupId>  
                <artifactId>spring-boot-starter-thymeleaf</artifactId>  
           </dependency>  
           <dependency>  
                <groupId>org.springframework.boot</groupId>  
                <artifactId>spring-boot-starter-web</artifactId>  
           </dependency>  
           <dependency>  
                <groupId>org.springframework.boot</groupId>  
                <artifactId>spring-boot-starter-test</artifactId>  
                <scope>test</scope>  
           </dependency>  
      </dependencies>  
      <build>  
           <plugins>  
                <plugin>  
                     <groupId>org.springframework.boot</groupId>  
                     <artifactId>spring-boot-maven-plugin</artifactId>  
                </plugin>  
           </plugins>  
      </build>  
 </project>


SpringbootDemo1Application.java (run this class to start spring boot application)
package com.shine2share;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SpringbootDemo1Application {

 public static void main(String[] args) {
  SpringApplication.run(SpringbootDemo1Application.class, args);
 }
}


Step2: create a simple controller and simple html page (index.html) under src/main/resources -> templates:



HomeController.java

package com.shine2share.controller;  



 import org.springframework.stereotype.Controller;  

import org.springframework.ui.Model;  


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

@Controller  
 public class HomeController {  
      @RequestMapping("/")  


           model.addAttribute("name", "Spring Developer.");  

public String sayHello(Model model) {  
           return "index";  
      }  


 }

index.html:
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org" 
      xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity4">
<head>
<meta charset="UTF-8" />
<title>Home</title>
</head>
<body>
  <h1><span th:text="'Hello: ' + ${name}"></span></h1>
</body>
</html>

ok.
check result with following url:

if your application don't show like above.
you can check your spring boot is running: (click to image to show full size)

if it stopped, you can run it again, right mouse click on project -> run as -> spring boot app
check url again.
happy coding.

thelam92

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