springboot 系列一（环境搭建和项目介绍）

介绍

Springboot这些年越来越普及，目前开发项目中也采用springboot并开发了几个相关项目。不过一直没有体系的去学习，最近工作不忙，抽时间详细的学习一下，并记录学习过程来提高自己.

学习资料来自于springboot官网提供的文档：https://docs.spring.io/spring-boot/docs/2.1.3.RELEASE/reference/htmlsingle/

环境

1. jdk8+
2. 管理工具

构建工具	版本
maven	3.3+
gradle	4.4+

3. 应用服务器

名字	Servlet版本
Tomcat 9.0	4.0
Jetty 9.4	3.1
Undertow 2.0	4.0

springboot 应用可以跑在servlet版本3.1+的容器中.

项目演示

• 创建pom文件

	4.0.0

	com.example
	myproject
	0.0.1-SNAPSHOT

	
		org.springframework.boot
		spring-boot-starter-parent
		2.1.3.RELEASE
	

	

• 添加依赖

	
		org.springframework.boot
		spring-boot-starter-web
	
`

• 编写启动类

import org.springframework.boot.*;
import org.springframework.boot.autoconfigure.*;
import org.springframework.web.bind.annotation.*;

@RestController
@EnableAutoConfiguration
public class Example {

	@RequestMapping("/")
	String home() {
		return "Hello World!";
	}

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

}

运行项目

$ mvn spring-boot:run

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::  (v2.1.3.RELEASE)
....... . . .
....... . . . (log output here)
....... . . .
........ Started Example in 2.222 seconds (JVM running for 6.514)

访问：localhost:8080

Hello World!

创建可执行jar包

• 添加spring-boot-maven-plugin插件

	
		
			org.springframework.boot
			spring-boot-maven-plugin
		
	

• 打包

$ mvn package

[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building myproject 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] .... ..
[INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ myproject ---
[INFO] Building jar: /Users/developer/example/spring-boot-example/target/myproject-0.0.1-SNAPSHOT.jar
[INFO]
[INFO] --- spring-boot-maven-plugin:2.1.3.RELEASE:repackage (default) @ myproject ---
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------

• 执行

$ java -jar target/myproject-0.0.1-SNAPSHOT.jar

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::  (v2.1.3.RELEASE)
....... . . .
....... . . . (log output here)
....... . . .
........ Started Example in 2.536 seconds (JVM running for 2.864)