如何将所有依赖项放在runnable jar的单独文件夹中？

Question

我正在使用mvn package创建一个可运行的jar,其中包含所有依赖项,运行正常.但我更喜欢将所有外部依赖项打包在一个单独的文件夹中.那么我需要改变什么呢？

    <plugin>
        <artifactId>maven-assembly-plugin</artifactId>
        <version>2.4</version>
        <configuration>
            <descriptorRefs>
                <descriptorRef>jar-with-dependencies</descriptorRef>
            </descriptorRefs>
            <archive>
                <manifest>
                    <mainClass>my.MainApp</mainClass>
                </manifest>
            </archive>
        </configuration>
        <executions>
            <execution>
                <id>make-assembly</id>
                <phase>package</phase>
                <goals>
                    <goal>single</goal>
                </goals>
            </execution>
        </executions>
        </plugin>

Answer 1

使用它maven-dependencies-plugin指定copy-dependencies执行的输出目录.

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-dependency-plugin</artifactId>
    <version>2.5.1</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>

更新:

要让jar知道在哪里找到该lib文件夹,可以Class-Path在manifest使用时将其指定为值maven-jar-plugin

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-jar-plugin</artifactId>
    <configuration>
    <archive>
        <manifest>
        <addClasspath>true</addClasspath>
        <classpathPrefix>lib/</classpathPrefix>
        <mainClass>foo.bar.MainClass</mainClass>
        </manifest>
    </archive>
    </configuration>
</plugin>

希望这可以帮助.