通常使用springboot构建出的是一个可执行的jar包,其中嵌套了项目依赖的第三方jar包,所以输出的jar包是一个很大的fat jar,在需要上传部署的操作中非常耗时。
先来看下通常的springboot项目的打包构建,如果继承自spring-boot-starter-parent,需使用spring-boot-maven-plugin:
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
如果通过定义spring-boot-dependencies,需指定
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>2.1.7.RELEASE</version>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
本文的目标是将自己的业务类打成一个可执行的jar包,将第三方依赖jar包输出到单独的lib目录,将配置文件输出到单独的conf目录。下面开始maven构建,分为4个步骤:
第一步:打包业务jar包,排除配置文件
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>3.2.0</version>
<configuration>
<archive>
<manifest>
<mainClass>com.hello.Hello</mainClass>
<addClasspath>true</addClasspath>
<classpathPrefix>lib</classpathPrefix>
</manifest>
<manifestEntries>
<Class-Path>resources/</Class-Path>
</manifestEntries>
</archive>
<outputDirectory>${project.build.directory}</outputDirectory>
<excludes>
<exclude>**/*.properties</exclude>
<exclude>**/*.xml</exclude>
<exclude>**/*.yml</exclude>
<exclude>static/**</exclude>
<exclude>templates/**</exclude>
</excludes>
</configuration>
</plugin>
第二步:将三方依赖jar包输出到步骤一指定目录lib
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>3.1.2</version>
<executions>
<execution>
<id>copy-dependencies</id>
<phase>package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<outputDirectory>${project.build.directory}/lib</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
第三步:将静态资源配置文件输出到步骤一指定目录resources
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<version>3.1.0</version>
<executions>
<execution>
<id>copy-resources</id
<phase>package</phase>
<goals>
<goal>copy-resources</goal>
</goals>
<configuration>
<encoding>UTF-8</encoding>
<outputDirectory>${project.build.directory}/resources</outputDirectory>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
</configuration>
</execution>
</executions>
</plugin>
最后调整一下spring-boot-maven-plugin
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>2.1.7.RELEASE</version>
<configuration>
<mainClass>com.hello.Hello</mainClass>
<includes>
<include>
<groupId>${project.groupId}</groupId>
<artifactId>${project.artifactId}</artifactId>
</include>
</includes>
<addResources>true</addResources>
</configuration>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
以上就完成了fat jar的分离,看下构建完成后的产物
在windows环境验证下,执行java -jar hello.jar项目正常启动。以后打包部署只需要提交自己的业务jar包了,也不用改一个配置文件就重新打包了,第三方jar包增量添加即可。
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