SpringBoot 项目瘦身maven/gradle详解

spring-boot-maven-plugin
    configuration
        layout ZIP
        includes
            include non-exists

maven-dependency-plugin
	excutions
		excution
			goal copy-dependencies
			configuration outputDirectory

<build>
	<finalName>thin-jar</finalName>
	<!--java -jar -Dloader.path=./lib thin-jar.jar-->
	<plugins>
		<plugin>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-maven-plugin</artifactId>
			<version>${spring.boot.version}</version>
			<executions>
				<execution>
					<goals>
						<goal>repackage</goal>
					</goals>
				</execution>
			</executions>
			<configuration>
				<!-- fork=true 新开 Jvm 运行插件 -->
				<fork>true</fork>
				<addResources>true</addResources>
				<jvmArguments>-Dfile.encoding=UTF-8</jvmArguments>
				<layout>ZIP</layout>
				<includes>
					<include>
						<groupId>non-exists</groupId>
						<artifactId>non-exists</artifactId>
					</include>
				</includes>
			</configuration>
		</plugin>

		<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>
						<outputDirectory>${project.build.directory}/lib</outputDirectory>
						<!--是否排除传递性-->
						<excludeTransitive>false</excludeTransitive>
						<!--是否去掉jar包版本信息-->
						<stripVersion>false</stripVersion>
						<!--包含范围-->
						<includeScope>runtime</includeScope>
					</configuration>
				</execution>
			</executions>
		</plugin>
	</plugins>
</build>

task clearJar(type: Delete) {
    delete "$buildDir/libs/lib"
}
 
// 将依赖包复制到lib目录
task copyJar(type: Copy, dependsOn: 'clearJar') {
    into "$buildDir/libs/lib"
    from configurations.runtime

    // from configurations.compileClasspath
}
 
bootJar {
    // mainClassName = ''
    // 例外所有的jar
    excludes = ["*.jar"]
    // lib目录的清除和复制任务 
    dependsOn clearJar
    dependsOn copyJar
 
    // 指定依赖包的路径, 无需 java.ext.dir 或 loader.path 参数
    manifest {
        attributes "Manifest-Version": 1.0,
            'Class-Path': configurations.compileClasspath.files.collect { "lib/$it.name" }.join(' ')
    }
}

# java -Djava.ext.dirs=./lib -jar bootrun.jar
java -jar bootrun.jar

# 运行 class 生效
java -cp .;lib/x.jar Test
# 运行 jar 失效
java -cp lib/x.jar -jar app.jar

bootJar {
    manifest {
        attributes 'Main-Class': 'org.springframework.boot.loader.PropertiesLauncher'
    }
}