为了使它更简单，你可以使用下面的插件。

             <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                        <configuration>
                            <classifier>spring-boot</classifier>
                            <mainClass>
                                com.nirav.certificate.CertificateUtility
                            </mainClass>
                        </configuration>
                    </execution>
                </executions>
            </plugin>

方法1:将依赖的JAR文件复制到target/lib中，然后将它们添加到MANIFEST中的JAR类路径中:

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-dependency-plugin</artifactId>
            <configuration>
                <outputDirectory>${project.build.directory}/lib</outputDirectory>
                <excludeTransitive>false</excludeTransitive> 
                <stripVersion>false</stripVersion>
            </configuration>
            <executions>
                <execution>
                    <id>copy-dependencies</id>
                    <phase>package</phase>
                    <goals>
                        <goal>copy-dependencies</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
        <!-- Add LIB folder to classPath -->
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-jar-plugin</artifactId>
            <version>2.4</version>
            <configuration>
                <archive>
                    <manifest>
                        <addClasspath>true</addClasspath>
                        <classpathPrefix>lib/</classpathPrefix>
                    </manifest>
                </archive>
            </configuration>
        </plugin>

方法2:解包所有依赖项，并将它们的类和资源重新打包到一个平面JAR中。注意:重叠的资源会随机丢失!

<plugin>
    <artifactId>maven-assembly-plugin</artifactId>
    <executions>
        <execution>
            <phase>package</phase>
            <goals><goal>single</goal></goals>
        </execution>
    </executions>
    <configuration>
        <descriptorRefs>
            <descriptorRef>jar-with-dependencies</descriptorRef>
        </descriptorRefs>
    </configuration>
</plugin>

看看这个答案:

I am creating an installer that runs as a Java JAR file and it needs to unpack WAR and JAR files into appropriate places in the installation directory. The dependency plugin can be used in the package phase with the copy goal and it will download any file in the Maven repository (including WAR files) and write them where ever you need them. I changed the output directory to ${project.build.directory}/classes and then end result is that the normal JAR task includes my files just fine. I can then extract them and write them into the installation directory.

<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
    <execution>
        <id>getWar</id>
        <phase>package</phase>
        <goals>
            <goal>copy</goal>
        </goals>
        <configuration>
            <artifactItems>
                <artifactItem>
                    <groupId>the.group.I.use</groupId>
                    <artifactId>MyServerServer</artifactId>
                    <version>${env.JAVA_SERVER_REL_VER}</version>
                    <type>war</type>
                    <destFileName>myWar.war</destFileName>
                </artifactItem>
            </artifactItems>
            <outputDirectory>${project.build.directory}/classes</outputDirectory>
        </configuration>
    </execution>
</executions>

在Maven2中，正确的方法是使用Maven2 Assembly Plugin，它有一个预定义的描述符文件，你可以在命令行中使用:

mvn assembly:assembly -DdescriptorId=jar-with-dependencies

如果你想让这个jar文件可执行，只需要在插件配置中添加要运行的主类:

<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-assembly-plugin</artifactId>
  <configuration>
    <archive>
      <manifest>
        <mainClass>my.package.to.my.MainClass</mainClass>
      </manifest>
    </archive>
  </configuration>
</plugin>

如果你想要创建程序集作为正常构建过程的一部分，你应该将单个或单目录目标(程序集目标应该只从命令行运行)绑定到生命周期阶段(包是有意义的)，就像这样:

<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-assembly-plugin</artifactId>
  <executions>
    <execution>
      <id>create-my-bundle</id>
      <phase>package</phase>
      <goals>
        <goal>single</goal>
      </goals>
      <configuration>
        <descriptorRefs>
          <descriptorRef>jar-with-dependencies</descriptorRef>
        </descriptorRefs>
        ...
      </configuration>
    </execution>
  </executions>
</plugin>

调整配置元素以满足您的需求(例如使用清单内容)。

把Maven放在一边，您可以把JAR库放在Main JAR中，但是您需要使用自己的类加载器。

检查这个项目:One-JAR链接文本

我试图做一些类似的事情，但我不希望所有的罐子都包括在内。我想从给定的依赖项中包含一些特定的目录。另外，分类器标签已经被占用，所以我不能做:

<dependencies>
    <dependency>
        <groupId>your.group.id</groupId>
        <artifactId>your.artifact.id</artifactId>
        <version>1.0</version>
        <type>jar</type>
        <classifier>jar-with-dependencies</classifier>
    </dependency>
</dependencies>

我使用maven-dependency-plugin和unpack goal 并将我想要的内容解压缩到${project.build。目录}/类，否则将省略 因为它在classes目录中，maven最终将它放在jar中

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-dependency-plugin</artifactId>
    <executions>
        <execution>
            <id>unpack</id>
            <phase>prepare-package</phase>
            <goals>
                <goal>unpack</goal>
            </goals>
            <configuration>
                <artifactItems>
                    <artifactItem>
                        <groupId>my.group</groupId>
                        <artifactId>my.artifact</artifactId>
                        <classifier>occupied</classifier>
                        <version>1.0</version>
                        <type>jar</type>
                    </artifactItem>
                </artifactItems>
                <outputDirectory>${project.build.directory}/classes</outputDirectory>
                <includes>aaa/**, bbb/**, ccc/**</includes>
            </configuration>
        </execution>
    </executions>
</plugin>