java 从 jar Maven 依赖项中排除 .class 文件
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excluding .class file from jar maven dependency
提问by Raaji
I had 3 maven projects A,B,C. A is dependent on B which in-turn depends on C. A's POM has dependency for B and B's POM has dependency for C. I want to exclude a class file in C when building A.
我有 3 个 maven 项目 A、B、C。A 依赖于 B，而 B 又依赖于 C。A 的 POM 依赖于 B，B 的 POM 依赖于 C。我想在构建 A 时排除 C 中的类文件。
How can I do this ? I tried doing this using excludes of maven-jar-plugin, but not able to succeed.
我怎样才能做到这一点 ？我尝试使用排除 maven-jar-plugin 来执行此操作，但无法成功。
回答by codeaholicguy
Use maven-jar-plugin
<plugin>
<artifactId>maven-jar-plugin</artifactId>
<version>2.3.1</version>
<executions>
<execution>
<id>default-jar</id>
<phase>package</phase>
<goals>
<goal>jar</goal>
</goals>
<configuration>
<excludes>
<exclude><!-- package you want to exclude --></exclude>
</excludes>
</configuration>
</execution>
</executions>
</plugin>
回答by coderplus
There is no quick and easy way of doing this. If you add a JAR as a dependency to your project, the JAR will be added to the test or compile classpath(based on the scope you provide).
没有快速简便的方法可以做到这一点。如果您将 JAR 作为依赖项添加到您的项目，JAR 将被添加到测试或编译类路径中（基于您提供的范围）。
The maven-dependency-pluginprovides an unpackgoal which can be used to unpack artifacts to a specific directory.
在maven-dependency-plugin提供了一个unpack可用于向解压缩伪影，以一个特定的目录目标。
As a work around for your problem, you can unpack artifact C into target/classes of A during build. The unpackgoal provides a way to exclude certain file patterns (so you can exclude specific classes).
作为解决您问题的方法，您可以在构建期间将工件 C 解压缩到 A 的目标/类中。该unpack目标提供了一种排除某些文件模式的方法（因此您可以排除特定的类）。
Also make sure that C JAR is not added to A's classpath(Adjust your dependencies accordingly - probably add a dependency for C of type pominstead of jar).
还要确保 C JAR 没有添加到 A 的类路径中（相应地调整您的依赖项 - 可能为 C 类型添加一个依赖项pom而不是jar）。
https://maven.apache.org/plugins/maven-dependency-plugin/unpack-mojo.html
https://maven.apache.org/plugins/maven-dependency-plugin/unpack-mojo.html
How to exclude C jar from A without changing B
如何在不改变 B 的情况下从 A 中排除 C jar
<dependency>
<artifactId>B</artifactId>
<groupId>bgroupId</groupId>
<version>bverison</version>
<exclusions>
<exclusion>
<artifactId>C</artifactId>
<groupId>cgroupId</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<artifactId>C</artifactId>
<groupId>cgroupId</groupId>
<version>cverison</version>
<type>pom</type>
<exclusions>
<exclusion>
<artifactId>*</artifactId>
<groupId>*</groupId>
</exclusion>
</exclusions>
</dependency>
Now you can use the dependency plugin to unpack the C JAR appropriately(excluding certain files)
现在您可以使用依赖插件适当地解压 C JAR（不包括某些文件）
