mvn build jar依赖和源码本身分开。减轻编译后的jar大小

问题场景：平时在springboot项目中，打jar包都是默认把开发的代码和依赖jar包都打到一个jar包里，导致每次打包费时而且jar包还很大，升级一下都要把一个很大的包拷来拷去。如果是修改问题需要频繁替换jar包，那简直要疯

解决方案：把代码包打成我们需要的jar包，把依赖的jar包打在依赖jar包文件夹中，其实绝大部分都是依赖包，自己开发的代码打包其实是很小的，比如我这次遇到的问题就是整个jar包一百多M，但是我自己开发的核心代码还不到1M

具体实现方法

<?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.jettech.jettomanager</groupId><artifactId>jettomanager-basic</artifactId><version>v7.5.0</version><name>jettomanager-basic</name><packaging>jar</packaging><description>Jettech jettomanager basic</description><url>http://www.jettech.jettomanager.com</url><organization><name> Jettech Software, Inc.</name><url>http://www.jettech.com</url></organization><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.0.5.RELEASE</version></parent><properties></properties><dependencies></dependencies><dependencyManagement><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>Finchley.RELEASE</version><type>pom</type><scope>import</scope></dependency><dependency><groupId>com.alibaba</groupId><artifactId>druid-spring-boot-starter</artifactId><version>${druid-spring-boot-starter.version}</version></dependency></dependencies></dependencyManagement><build><finalName>${project.artifactId}-${project.version}</finalName><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><configuration><!-- 启动类的路径 --><mainClass>xxxxxxxxxxxxx</mainClass><!-- 包含引入本地的Jar --><layout>ZIP</layout><includes><include><groupId>nothing</groupId><artifactId>nothing</artifactId></include></includes></configuration></plugin><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-dependency-plugin</artifactId><executions><execution><id>copy</id><phase>package</phase><goals><goal>copy-dependencies</goal></goals><configuration>                <!--指定的依赖路径--><outputDirectory>${project.build.directory}/lib</outputDirectory></configuration></execution></executions></plugin><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-surefire-plugin</artifactId><configuration><skipTests>true</skipTests></configuration></plugin></plugins></build>
</project>

<build><plugins><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><version>3.8.1</version><configuration><source>1.8</source><target>1.8</target><encoding>UTF-8</encoding></configuration></plugin><!--打包的时候去除依赖包--><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><version>2.3.7.RELEASE</version><configuration><mainClass>com.sunwei.syslog.SyslogApplication</mainClass><layout>ZIP</layout><includes><include><groupId>nothing</groupId><artifactId>nothing</artifactId></include></includes></configuration><executions><execution><id>repackage</id><goals><goal>repackage</goal></goals></execution></executions></plugin><!--target/lib是依赖jar包的输出目录，根据自己喜好配置--><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-dependency-plugin</artifactId><executions><execution><id>copy-dependencies</id><phase>package</phase><goals><goal>copy-dependencies</goal></goals><configuration><outputDirectory>target/lib</outputDirectory><excludeTransitive>false</excludeTransitive><stripVersion>false</stripVersion><includeScope>runtime</includeScope></configuration></execution></executions></plugin></plugins>
</build>

2.在以上配置完成后，执行打包命令 mvn clean package  ,会看到代码被打成了比较小jar包，依赖包被打在target文件夹下面的lib文件夹中

3.启动项目方式。将jar包和依赖的lib文件夹拷贝到服务器的同一文件目录下执行

java -Dloader.path="lib" -jar xx.jar

即可启动项目，xx.jar就是你打的那些个jar包