java基础---->自定义gradle的插件

java

  这里面简单的介绍一下gradle插件的编写。

我们编写的gradle脚本一般是放在build.gradle文件中。所以首先创建一下build.gradle文件,下面的例子都是在此文件中。

一、简单的gradle插件

class GreetingPlugin implements Plugin<Project> {

void apply(Project project) {

project.task('hello') {

doLast {

println 'Hello from the GreetingPlugin'

}

}

}

}

apply plugin: GreetingPlugin

运行结果:

二、 编写可配置的插件

class GreetingPluginExtension {

String message

String greeter

}

class GreetingPlugin implements Plugin<Project> {

void apply(Project project) {

def extension = project.extensions.create('greeting', GreetingPluginExtension)

project.task('hello') {

doLast {

println "${extension.message} from ${extension.greeter}"

}

}

}

}

apply plugin: GreetingPlugin

greeting {

message = 'Hello'

greeter = 'huhx'

}

 运行结果:

三、编写与文件交互的插件

class GreetingToFileTask extends DefaultTask {

def destination

File getDestination() {

project.file(destination)

}

@TaskAction

def greet() {

def file = getDestination()

file.parentFile.mkdirs()

file.write 'Hello!'

}

}

task greet(type: GreetingToFileTask) {

destination = { project.greetingFile }

}

task sayGreeting(dependsOn: greet) {

doLast {

println file(greetingFile).text

}

}

ext.greetingFile = "$buildDir/hello.txt"

运行结果:并且在2018-12-28/build目录下面生成一个hello.txt,里面的内容是Hello。

四、编写带有拓展功能的插件

class GreetingPlugin implements Plugin<Project> {

void apply(Project project) {

def extension = project.extensions.create('greeting', GreetingPluginExtension, project)

project.tasks.create('hello', Greeting) {

message = extension.message

outputFiles = extension.outputFiles

}

}

}

class GreetingPluginExtension {

final Property<String> message

final ConfigurableFileCollection outputFiles

GreetingPluginExtension(Project project) {

message = project.objects.property(String)

message.set('Hello from GreetingPlugin')

outputFiles = project.layout.configurableFiles()

}

void setOutputFiles(FileCollection outputFiles) {

this.outputFiles.setFrom(outputFiles)

}

}

class Greeting extends DefaultTask {

final Property<String> message = project.objects.property(String)

final ConfigurableFileCollection outputFiles = project.layout.configurableFiles()

void setOutputFiles(FileCollection outputFiles) {

this.outputFiles.setFrom(outputFiles)

}

@TaskAction

void printMessage() {

outputFiles.each {

logger.quiet "Writing message 'Hi from Gradle' to file"

it.text = message.get()

}

}

}

apply plugin: GreetingPlugin

greeting {

message = 'Hi from Gradle'

outputFiles = layout.files('a.txt', 'b.txt')

运行结果:并且在2018-12-28目录下面生成a.txt和b.txt,文件的内容均为:Hi from Gradle

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