buildscript {
    repositories {
        maven { url 'http://maven.aliyun.com/nexus/content/groups/public/' }
    }

    dependencies {
        classpath "com.github.jengelman.gradle.plugins:shadow:2.0.4"
    }
}

apply plugin: 'java'
apply plugin: "com.github.johnrengelman.shadow"

repositories {
    mavenLocal()
    maven { url 'http://maven.aliyun.com/nexus/content/groups/public/'
 
 }
    maven { url 'https://repo.spring.io/libs-snapshot/' }
}

dependencies {
    compile 'dom4j:dom4j:1.6.1'
    compile group: 'org.mybatis', name: 'mybatis', version: '3.4.5'
    compile 'javax.servlet:servlet-api:2.5'
}

//禁掉jar task
jar.enabled = false
shadowJar {
    baseName = 'jarName'
    //classifier是生成jar包的字尾
 

    classifier = null
    version = '1.0.0'
    manifest {
        attributes 'Main-Class': 'Test'
    }

    exclude 'no-overflow.css'

    dependencies {
        // 排除掉mybatis程式碼
        exclude(dependency('org.mybatis:mybatis'))
    }
}

assemble.dependsOn(shadowJar)

　　執行gradle build即可。

　　在某些場合，我們不需要依賴和src打在一個jar包，我們希望有個lib，然後我們的jar執行時，自動去找依賴jar。這樣，就可以不用外掛了：

task copyDependencies(type: Copy) {
    from configurations.runtime
    into 'build/libs/lib'
}
jar.dependsOn(copyDependencies)

jar {
    manifest {
        attributes "Implementation-Title": project.name
        attributes "Implementation-Version": '1.0.0'
        attributes 'Main-Class': 'Test'
    }

    if (!configurations.runtime.isEmpty()) {
        manifest.attributes('Class-Path': '. lib/' + configurations.runtime.collect { it.name }.join(' lib/'))
    }
}

　　原理就是在MANIFEST.MF中加入了Class-Path屬性。執行時，jar包要和lib目錄在同一級目錄下，當然也可以根據需要修改。