maven 打jar包依赖问题

共有3个插件maven-shade-plugin，maven-jar-plugin+dependency，maven-assembly-plugin

 https://blog.csdn.net/fuck487/article/details/77503925

1.shade直接打包，包含所有依赖项

https://blog.csdn.net/bljbljbljbljblj/article/details/52484595

<plugin>

    <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-shade-plugin</artifactId>
            <version>1.7.1</version>
            <executions>
                <execution>
                    <phase>package</phase>
                    <goals>
                        <goal>shade</goal>
                    </goals>
                    <configuration>
                        <filters>
                            <filter>
                                <artifact>:</artifact> -》<artifact>*:*</artifact>
                                <excludes>
                                    <exclude>META-INF/*.SF</exclude>
                                    <exclude>META-INF/*.DSA</exclude>
                                    <exclude>META-INF/*.RSA</exclude>
                                </excludes>
                            </filter>
                        </filters>
                        <transformers>
                            <transformer
                        implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                <mainClass>com.xxx.xxx</mainClass>
                            </transformer>
                            <transformer
                                implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                                <resource>META-INF/spring.handlers</resource>
                            </transformer>
                            <transformer
                                implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                                <resource>META-INF/spring.schemas</resource>
                            </transformer>
                        </transformers>
                    </configuration>
                </execution>
            </executions>
        </plugin>

　　

1+ spring boot也是内置依赖 

2.jar不含依赖项

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.3</version>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-jar-plugin</artifactId>
            <configuration>
                <archive>
                    <manifest>
                        <addClasspath>true</addClasspath>
                        <classpathPrefix>lib/</classpathPrefix>
                        <mainClass>com.newlandframework.rpc.boot.RpcServerStarter</mainClass>
                    </manifest>
                </archive>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-dependency-plugin</artifactId>
            <executions>
                <execution>
                    <id>copy</id>
                    <phase>package</phase>
                    <goals>
                        <goal>copy-dependencies</goal>
                    </goals>
                    <configuration>
                        <outputDirectory>
                            ${project.build.directory}/lib
                        </outputDirectory>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

<phase>prepare-package</phase>可将jar依赖包一起打入，不过会有问题，它会把依赖jar包打进去，在里面开一个lib目录塞进去，而不是像assembly和shade一样以class的形式打进jar包 2019.12.5

3.assembly
内置依赖：
https://blog.csdn.net/bljbljbljbljblj/article/details/52484595

<plugin>

<artifactId>maven-assembly-plugin</artifactId>
                <version>2.2-beta-5</version>
                <configuration>
                    <archive>
                        <manifest>
                            <mainClass>com.xxx.xxx</mainClass>   包含main方法的类
                        </manifest>
                    </archive>
                    <descriptorRefs>
                        <descriptorRef>jar-with-dependencies</descriptorRef> 将依赖包一起打包
                    </descriptorRefs>
                </configuration>
                <executions>
                    <execution>                        执行器 mvn assembly:assembly
                        <id>make-assembly</id>         是个名字,可以任意
                        <phase>package</phase>         绑定到package生命周期阶段上
                        <goals>
                            <goal>single</goal>        只运行一次
                        </goals>
                    </execution>
                </executions>
    </plugin>

　　

至于我为什么最终会选择maven-shade-plugin这种方式,是因为之前在使用maven-assembly-plugin的时候,在本地运行没有任何问题,而当我们放到linux上运行jar包的时候,就会出现错误Unable to locate Spring NamespaceHandler for XML schema namespace[http://www.springframework.org/schema/context]等等之类的错误,错误原因大概是因为由于项目中用到了spring框架,而当我们在项目中使用spring的多个内容的时候,包含了相同名字的文件,通过看网上的解决办法,发现maven-shade-plugin这个插件的打jar包方式可以解决该问题,上述pom.xml上的<transformer>标签中的内容就是解决该问题的!

参考：
http://blog.51cto.com/alex233/1885759
http://www.cnblogs.com/dzblog/p/6913809.html
https://blog.csdn.net/bljbljbljbljblj/article/details/52484595