Springboot项目打包：将依赖的jar包输出到指定目录

场景

公司要对springboot项目依赖的jar包进行升级，但是遇到一个问题，项目打包之后，没办法看到他里面依赖的jar包，版本到底是不是升上去了，没办法看到。

下面是项目打的jar包

我们通过反编译工具jdgui，来看一下jar包文件内容，我们发现里面根本没有看到依赖的jar包

既然看不到依赖的jar包，那么就没办法确定，jar包版本是否升级成功，那应该怎么办呢？

解决办法

maven有一个办法，就是可以将依赖的jar包输出的指定的目录。具体配置如下：

<?xml version="1.0" encoding="UTF-8"?><projectxmlns="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.hidata.kafka</groupId><artifactId>hijob-kafka</artifactId><version>0.1</version><dependencyManagement><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-dependencies</artifactId><version>2.7.18</version><type>pom</type><scope>import</scope></dependency></dependencies></dependencyManagement><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><java.version>1.8</java.version><bboss.version>5.8.6</bboss.version></properties><dependencies><!-- spring boot --><dependency>
            .....
        </dependency></dependencies><build><resources><resource><directory>${project.basedir}/src/main/resources</directory><filtering>true</filtering><excludes><exclude>static/**</exclude></excludes></resource><resource><directory>${project.basedir}/src/main/resources</directory><filtering>false</filtering><includes><include>static/**</include></includes></resource></resources><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><configuration><mainClass>com.hidata.kafka.HijobKafkaApplication</mainClass><layout>ZIP</layout><includes><include><groupId>nothing</groupId><artifactId>nothing</artifactId></include></includes></configuration><executions><execution><goals><goal>repackage</goal></goals></execution></executions></plugin><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><configuration><source>7</source><target>7</target></configuration></plugin><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><!--target/lib是依赖jar包的输出目录，根据自己喜好配置--><outputDirectory>target/lib</outputDirectory><excludeTransitive>false</excludeTransitive><stripVersion>false</stripVersion><includeScope>runtime</includeScope></configuration></execution></executions></plugin></plugins></build></project>

重要的事再说一遍，其实核心就是这一句配置

<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><!--target/lib是依赖jar包的输出目录，根据自己喜好配置--><outputDirectory>target/lib</outputDirectory><excludeTransitive>false</excludeTransitive><stripVersion>false</stripVersion><includeScope>runtime</includeScope></configuration></execution></executions></plugin>

我们再打包一下看看效果：

我们发现target多了一个文件夹lib，其实他就是存放项目所依赖的jar包的。打开lib文件夹，发现里面全部都是jar包

这样就可以知道，jar包的版本到底有没有升级成功了。