如何将所有依赖项放在runnable jar的单独文件夹中？ [英] How to put all dependencies in separate folder for runnable jar?

问题描述

我正在使用 mvn package 来创建一个可运行的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？

I'm using mvn package to create a runnable jar with all dependencies packed inside, which runs fine. But I'd prefer to have all external dependencies packed in a separate folder. What would I have to change therefore?

    <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>

推荐答案

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

Use the maven-dependencies-plugin to specify an output directory for the copy-dependencies execution.

<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 lib 文件夹，您可以将其指定为 Class-Path 清单中的值使用 maven-jar-plugin

To let the jar know where to find the lib folder, you can specify this as a Class-Path value in the manifest using the 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>

希望这会有所帮助。

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