纯手工创建SpringBoot项目——HelloWorld

Maven 使用约定优于配置的原则

1.创建maven工程

// 创建项目根据目录
~/Desktop$ mkdir MySpringboot

// 按照上面maven的约定创建目录
~/Desktop$ mkdir -p MySpringboot/src/main/java
~/Desktop$ mkdir -p MySpringboot/src/main/resources
~/Desktop$ mkdir -p MySpringboot/src/test/java
~/Desktop$ mkdir -p MySpringboot/src/test/resources

// 在根目录下创建pom.xml文件
~/Desktop$ touch MySpringboot/pom.xml

// 创建好的maven项目目录结构
~/Desktop$ tree MySpringboot
MySpringboot
├── pom.xml
└── src ├── main │   ├── java │   └── resources └── test ├── java └── resources

7 directories, 1 file


  

 

  
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2.导入spring boot相关依赖

在pom.xml加入如下配置：

<?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.wong</groupId> <!--与项目名称一致--> <artifactId>MySpringboot</artifactId> <version>1.0-SNAPSHOT</version> <properties> <java.version>1.8</java.version> </properties> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.2.5.RELEASE</version> <relativePath/> </parent> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> </dependencies>
</project>

  

 

  
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spring-boot-starter-web这个场景启动器会把与web开发相关的依赖导进项目，更多场景启动器请参考：springboot场景启动器

3.编写主程序：启动Spring Boot应用

创建包名com.wong（实际上就是目录）:

~/Desktop/MySpringboot$ mkdir -p src/main/java/com/wong

  

 

  
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在包com.wong创建主程序MainApplication.java:

package com.wong;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* @SpringBootApplication用于标注主程序
*/
@SpringBootApplication
public class MainApplication{ public static void main(String[] args){ // 启动Spring应用 SpringApplication.run(MainApplication.class,args); }
}

  

 

  
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4.编写业务相关的Controller

创建多一个包，用来存放业务控制器：

~/Desktop/MySpringboot$ mkdir -p src/main/java/com/wong/controller

  

 

  
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创建控制器HelloWorldController.java:

package com.wong.controller;

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

@RestController
@RequestMapping("world")
public class HelloWorldController{ @GetMapping("hi") public String index(){ return "Hello World!"; }
}

  

 

  
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5.测试

使用mvn spring-boot:run命令运行程序：

~/Desktop/MySpringboot$ mvn spring-boot:run
[INFO] Scanning for projects...
...
  .   ____ _ __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot :: (v2.2.5.RELEASE)

2020-03-24 22:13:45.941  INFO 20580 --- [ main] com.wong.MainApplication : Starting MainApplication on kyun-HP-348-G3 with PID 20580 (/home/kyun/Desktop/MySpringboot/target/classes started by kyun in /home/kyun/Desktop/MySpringboot)
2020-03-24 22:13:45.944  INFO 20580 --- [ main] com.wong.MainApplication : No active profile set, falling back to default profiles: default
2020-03-24 22:13:46.662  INFO 20580 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2020-03-24 22:13:46.670  INFO 20580 --- [ main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2020-03-24 22:13:46.671  INFO 20580 --- [ main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.31]
2020-03-24 22:13:46.716  INFO 20580 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2020-03-24 22:13:46.716  INFO 20580 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 720 ms
2020-03-24 22:13:46.852  INFO 20580 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2020-03-24 22:13:46.967  INFO 20580 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2020-03-24 22:13:46.969  INFO 20580 --- [ main] com.wong.MainApplication : Started MainApplication in 1.298 seconds (JVM running for 1.604)


  

 

  
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浏览器输入http://localhost:8080/world/hi：
　

6.简化部署

完全可以不用打war包，再发布到Tomcat容器里。可以直接打出jar包，然后直接用java -jar <name>.jar命令来运行。
首先，要在pom.xml加入以下插件：

	<build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build>

  

 

  
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然后执行以下打包命令：

~/Desktop/MySpringboot$ mvn package spring-boot:repackage

  

 

  
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打出来的包在target目录下：

~/Desktop/MySpringboot$ cd target
~/Desktop/MySpringboot/target$ ls
classes maven-status
generated-sources MySpringboot-1.0-SNAPSHOT.jar
generated-test-sources  MySpringboot-1.0-SNAPSHOT.jar.original
maven-archiver test-classes
~/Desktop/MySpringboot/target$ java -jar MySpringboot-1.0-SNAPSHOT.jar
...

  

 

  
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以上就是创建SpringBoot项目的所有内容。

文章来源: blog.csdn.net，作者：WongKyunban，版权归原作者所有，如需转载，请联系作者。

原文链接：blog.csdn.net/weixin_40763897/article/details/105081785