打包备份文件

此时，打包将依赖之前的makeReleaseVersion方法，执行定义好的版本信息并保持使用此配置，打包使用Zip形式，task的outputs 使用 war插件的war.outputs.files, 打包内容为所有的源文件以及版本配置文件, 此时保存的源文件为java文件，注意此时的task类型为Zip

task createDistribution(type: Zip, dependsOn: makeReleaseVersion){
    //use outputs of war.outputs.files as outputs
    from war.outputs.files

    //put all source into 'src' folder
    from(sourceSets*.allSource){
        into 'src'
    }

    from(rootDir){
        include project.ext.myTagFile.name
    }
}

保存/复制备份文件

使用之前task的createDistribution.outputs.files 作为outputs，保存备份文件到build文件下的backup

task backupReleaseDistribution(type: Copy){
    //use outputs of createDistribution.outputs.files as outputs
    from createDistribution.outputs.files
    into "$buildDir/backup"
}

发布

简单打印日志

task release(dependsOn: backupReleaseDistribution){
    doLast{
        logger.quiet 'releasing the project...'
    }
}

执行

//gradlew release
> Task :release
releasing the project...

同时也可以看到工程下build文件夹下多出了一个backup包，含有一个本工程的zip文件.

执行顺序

我们可以根据 -i 来观察详细的执行顺序来研究依赖关系

D:\code\gradleTuto>gradlew release -i
... ...
All projects evaluated.
Selected primary task 'release' from project :
Tasks to be executed: [task ':makeReleaseVersion', task ':compileJava', task ':processResources', task ':classes', task ':war', task ':createDistri
bution', task ':backupReleaseDistribution', task ':release']
Tasks that were excluded: []
:makeReleaseVersion (Thread[Daemon worker Thread 2,5,main]) started.

> Task :makeReleaseVersion UP-TO-DATE
Caching disabled for task ':makeReleaseVersion' because:
  Build cache is disabled
Skipping task ':makeReleaseVersion' as it is up-to-date.
:makeReleaseVersion (Thread[Daemon worker Thread 2,5,main]) completed. Took 0.004 secs.
:compileJava (Thread[Daemon worker Thread 2,5,main]) started.

> Task :compileJava UP-TO-DATE
Resolving global dependency management for project 'demo'
Excluding []
Excluding []
Caching disabled for task ':compileJava' because:
  Build cache is disabled
Skipping task ':compileJava' as it is up-to-date.
:compileJava (Thread[Daemon worker Thread 2,5,main]) completed. Took 0.598 secs.
:processResources (Thread[Daemon worker Thread 2,5,main]) started.

> Task :processResources UP-TO-DATE
Caching disabled for task ':processResources' because:
  Build cache is disabled
Skipping task ':processResources' as it is up-to-date.
:processResources (Thread[Daemon worker Thread 2,5,main]) completed. Took 0.003 secs.
:classes (Thread[Daemon worker Thread 2,5,main]) started.

> Task :classes UP-TO-DATE
Skipping task ':classes' as it has no actions.
:classes (Thread[Daemon worker Thread 2,5,main]) completed. Took 0.0 secs.
:war (Thread[Daemon worker Thread 2,5,main]) started.

> Task :war SKIPPED
Skipping task ':war' as task onlyIf is false.
:war (Thread[Daemon worker Thread 2,5,main]) completed. Took 0.0 secs.
:createDistribution (Thread[Daemon worker Thread 2,5,main]) started.

> Task :createDistribution UP-TO-DATE
file or directory 'D:\code\gradleTuto\build\libs\demo-0.0.1-SNAPSHOT.war', not found
Caching disabled for task ':createDistribution' because:
  Build cache is disabled
Skipping task ':createDistribution' as it is up-to-date.
:createDistribution (Thread[Daemon worker Thread 2,5,main]) completed. Took 0.01 secs.
:backupReleaseDistribution (Thread[Daemon worker Thread 2,5,main]) started.

> Task :backupReleaseDistribution UP-TO-DATE
Caching disabled for task ':backupReleaseDistribution' because:
  Build cache is disabled
Skipping task ':backupReleaseDistribution' as it is up-to-date.
:backupReleaseDistribution (Thread[Daemon worker Thread 2,5,main]) completed. Took 0.002 secs.
:release (Thread[Daemon worker Thread 2,5,main]) started.

> Task :release
Caching disabled for task ':release' because:
  Build cache is disabled
Task ':release' is not up-to-date because:
  Task has not declared any outputs despite executing actions.
releasing the project...
:release (Thread[Daemon worker Thread 2,5,main]) completed. Took 0.002 secs.

BUILD SUCCESSFUL in 2s
6 actionable tasks: 1 executed, 5 up-to-date

总结

这里定义的task， 其参数都是task， 例如: Zip, Copy 和backupReleaseDistribution， 这些task也有自己的实现比如:

public class Zip extends AbstractArchiveTask
public class Copy extends AbstractCopyTask

他们也都有自己的内部逻辑，输入以及使用比如war.outputs.files输出一级一级返回，还有action定义，那么这些action也会被相应的执行，比如zip时打包:

@Override
    protected CopyAction createCopyAction() {
        DocumentationRegistry documentationRegistry = getServices().get(DocumentationRegistry.class);
        return new ZipCopyAction(getArchiveFile().get().getAsFile(), getCompressor(), documentationRegistry, metadataCharset, isPreserveFileTimestamps());
    }

那么我们可以根据需要来定义自己的task，使用需要的task type来完成自己的业务需求，不懂的时候可以直接进入Javadocs进行.