Springboot源码分析之项目结构

Springboot源码分析之项目结构

摘要:

• 无论是从IDEA还是其他的SDS开发工具亦或是https://start.spring.io/ 进行解压,我们都会得到同样的一个pom.xml文件

  4.0.0

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

      <groupId>com.github.dqqzj</groupId>
      <artifactId>springboot</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      <name>springboot</name>
      <packaging>jar</packaging>
      <description>Demo project for Spring Boot</description>
  
      <properties>
          <java.version>1.8</java.version>
      </properties>
  
      <dependencies>
          <dependency>
              <groupId>org.springframework.boot</groupId>
              <artifactId>spring-boot-starter</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>

parent标签的含义

• 找到本地仓库的spring-boot-starter-parent 坐标

  4.0.0

  org.springframework.boot
  spring-boot-dependencies
  2.1.6.RELEASE
  ../../spring-boot-dependencies

  spring-boot-starter-parent
  pom
  Spring Boot Starter Parent
  Parent pom providing dependency and plugin management for applications
  built with Maven
  https://projects.spring.io/spring-boot/#/spring-boot-starter-parent

  <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
  <java.version>1.8</java.version>
  <resource.delimiter>@</resource.delimiter>
  <maven.compiler.source>${java.version}</maven.compiler.source>
  <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  <maven.compiler.target>${java.version}</maven.compiler.target>

  true
  ${basedir}/src/main/resources

  **/application*.yml
  **/application*.yaml
  **/application*.properties

  ${basedir}/src/main/resources

  **/application*.yml
  **/application*.yaml
  **/application.properties

  org.jetbrains.kotlin
  kotlin-maven-plugin
  ${kotlin.version}

  compile
  compile

  compile

  test-compile
  test-compile

  test-compile

  ${java.version}
  true

  maven-compiler-plugin

  true

  maven-failsafe-plugin

  integration-test
  verify

  ${project.build.outputDirectory}

  maven-jar-plugin

  ${start-class}
  true

  maven-war-plugin

  ${start-class}
  true

  org.codehaus.mojo
  exec-maven-plugin

  ${start-class}

  maven-resources-plugin

  ${resource.delimiter}

  false

  pl.project13.maven
  git-commit-id-plugin

  revision

  true
  yyyy-MM-dd'T'HH:mm:ssZ
  true
  ${project.build.outputDirectory}/git.properties

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

  repackage

  repackage

  ${start-class}

  maven-shade-plugin

  package

  shade

  META-INF/spring.handlers

  META-INF/spring.factories

  META-INF/spring.schemas

  ${start-class}

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

  true
  true

  :

  META-INF/.SF
  META-INF/.DSA
  META-INF/.RSA

  org.eclipse.m2e
  lifecycle-mapping
  1.0.0

  org.codehaus.mojo
  flatten-maven-plugin
  [1.0.0,)

  flatten

  org.apache.maven.plugins
  maven-checkstyle-plugin
  [3.0.0,)

  check

关注点

•   <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-dependencies</artifactId>
        <version>2.1.6.RELEASE</version>
        <relativePath>../../spring-boot-dependencies</relativePath>
      </parent>

说明我们的工程可以进行改造进行替换掉原来工程的parent标签.

• <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <executions>
              <execution>
                <id>repackage</id>
                <goals>
                  <goal>repackage</goal>
                </goals>
              </execution>
            </executions>
            <configuration>
              <mainClass>${start-class}</mainClass>
            </configuration>
          </plugin>

  repackage必须要有否则打jar包时候无法正常启动.
  

在配置文件加上repackage即可

<build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

IDEA自带maven工具

mvnw是基于linux的shell脚本命令

mvnw.cmd是基于windows的脚本命令

.mvn包含了maven下载路径以及版本等信息

也就是说我们完全不用自己下载maven而是可以直接使用IDEA给我们提供的工具即可，只不过通常不会这么做。

repackage的作用

• 官方文档
• 正常情况下打包会生成springboot-0.0.1-SNAPSHOT.jar,original,springboot-0.0.1-SNAPSHOT.jar这样的2个文件，而repackage的作用就是将springboot-0.0.1-SNAPSHOT.jar.original重新打包为我们可以执行的springboot-0.0.1-SNAPSHOT.jar