# 20 minutes Quick Start Spring Boot Application

20 minutes Quick Start Spring Boot Application

Spring the Boot (referred to as SB) for simplifying the configuration process Spring application.
A "habit over configuration" approach to develop
learning SPB is actually grasp its various constraints and requirements.

Learning Video address: http://www.itlaoqi.com/chapter/1647.html

Pre-preparation

• JDK 8 or later
• We recommended to install Intellj Idea Ultimate (Ultimate Edition)

• We will use Maven and Spring MVC

  Spring Boot directory structure

• / Java Java source code directory
• / Resources Resource Directory
• / Resources / static static resource directory
• / Resources / templates directory page presentation layer
• /resources/application.properties Spring Boot Profiles

• / Test test file directory

  Spring Boot development summary

1. Creating the Maven project, build the project structure
2. Configuration pom.xml, references to simplify the configuration of various starter starter
3. Configure operating parameters
4. Coding and testing

5. Packaged with the stand-alone

   1. Create a Maven project, build the project structure

• New Maven project, such as: com.itlaoqi.myspringboot
• Creating resources / templates directory to store the template engine
• Creating resources / static directory, store static pages

• Creating resources / application.properties, SPB core profile

  2. Open pom.xml, introducing dependent

• Basic spring-boot-starter-parent Spring Boot all the components references
• spring-boot-starter-web provides support for Web applications SB
• spring-boot-starter-thymeleaf support thymeleaf template engine

• spring-boot-maven-plugin package provides application functionality SPB

<?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.qiyi</groupId>
    <artifactId>myspringboot</artifactId>
    <version>1.0-SNAPSHOT</version>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.1.RELEASE</version>
    </parent>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

3. Open application.properties, configure Tomcat port

server.port=80

4. Create a test Controller, verify successful configuration

package com.qiyi.myspringboot.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class MyController {
    @RequestMapping("/out") //绑定到out地址
    @ResponseBody //直接向浏览器输出
    public String out(){
        return "success";
    }
}

5. Create entry application class SpringBoot

package com.qiyi.myspringboot;

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

//告诉SpringBoot我是一个入口类，运行我就能启动SB
//会自动扫描可以被注入的类，并初始化
//@Repository / @Service / @Controller / @Component / @Entity
@SpringBootApplication
public class MySpringBootApplication {
    public static void main(String[] args) {
        //启动SpringBoot，并初始化相关的组件
        SpringApplication.run(MySpringBootApplication.class);
    }
}

6. Start running MySpringBootApplication

7. Open your browser and enter localhost / out address, see the words configuration was successful success