Spring Boot jar文件瘦身--把单一Spring Boot jar文件，分离为依赖组件lib目录和一个业务jar来进行部署，优化单个jar文件大小到一两百KB。

1、某个模块下的pom.xml

2、调整修改

（1）

图中涉及到调整的代码：

target
（2）

图中涉及到调整的代码：

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
                <compilerArguments>
                    <extdirs>${project.basedir}/lib</extdirs>
                </compilerArguments>
            </configuration>
        </plugin>

(3)

图中涉及到调整的代码：

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-jar-plugin</artifactId>
            <configuration>
                <archive>
                    <manifest>
                        <addClasspath>true</addClasspath>
                        <classpathPrefix>lib/</classpathPrefix>
                        <useUniqueVersions>false</useUniqueVersions>
                        <mainClass>com.tkjt.dmp.job.JobApplication</mainClass>
                    </manifest>
                    <manifestEntries>
                        <!-- 加入第三方jar包的路径 -->
                        <Class-Path>lib/greenplum-jdbc-5.1.4.jar</Class-Path>
                    </manifestEntries>
                </archive>
                <outputDirectory>${boot-jar-output}</outputDirectory>
            </configuration>
        </plugin>
        <!-- 拷贝项目所有依赖jar文件到构建lib目录下 -->
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-dependency-plugin</artifactId>
            <executions>
                <execution>
                    <id>copy-dependencies</id>
                    <phase>package</phase>
                    <goals>
                        <goal>copy-dependencies</goal>
                    </goals>
                    <configuration>
                        <!--
                        各子模块按照实际层级定义各模块对应的属性值，检查所有微服务模块依赖jar文件合并复制到同一个目录
                        详见各子模块中 boot-jar-output 属性定义
                        -->
                        <outputDirectory>${boot-jar-output}/lib</outputDirectory>
                        <excludeTransitive>false</excludeTransitive>
                        <stripVersion>false</stripVersion>
                        <silent>false</silent>
                    </configuration>
                </execution>
            </executions>
        </plugin>

例二：

    <finalName>${project.artifactId}</finalName>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
                <compilerArguments>
                    <extdirs>${project.basedir}/lib</extdirs>
                </compilerArguments>
            </configuration>
        </plugin>
        <!-- 单元测试插件 -->
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-surefire-plugin</artifactId>
            <version>2.22.2</version>
            <configuration>
                <!-- 跳过整个单元测试的执行 -->
                <skip>true</skip>
            </configuration>
        </plugin>
        <!-- 基于maven-jar-plugin插件实现把依赖jar定义写入输出jar的META-INFO/MANIFEST文件 -->
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-jar-plugin</artifactId>
            <configuration>
                <archive>
                    <manifest>
                        <addClasspath>true</addClasspath>
                        <classpathPrefix>lib/</classpathPrefix>
                        <useUniqueVersions>false</useUniqueVersions>
                        <mainClass>com.tkjt.dmp.system.SystemApplication</mainClass>
                    </manifest>
                </archive>
                <outputDirectory>${boot-jar-output}</outputDirectory>
            </configuration>
        </plugin>
        <!-- 拷贝项目所有依赖jar文件到构建lib目录下 -->
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-dependency-plugin</artifactId>
            <executions>
                <execution>
                    <id>copy-dependencies</id>
                    <phase>package</phase>
                    <goals>
                        <goal>copy-dependencies</goal>
                    </goals>
                    <configuration>
                        <!--
                        各子模块按照实际层级定义各模块对应的属性值，检查所有微服务模块依赖jar文件合并复制到同一个目录
                        详见各子模块中 boot-jar-output 属性定义
                        -->
                        <outputDirectory>${boot-jar-output}/lib</outputDirectory>
                        <excludeTransitive>false</excludeTransitive>
                        <stripVersion>false</stripVersion>
                        <silent>false</silent>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>