第一个 Gradle 脚本及简单命令
第一个 Gradle 脚本及简单命令
task helloworld {
doLast {
print 'Hello world!'
}
}
/* <<这种方式将在 Gradle5.0 中删除，不建议使用 */
task helloworldSort << {
print 'Hello world!'
}
task startSession << {
println 'startSession'
chant()
}
def chant() {
/*使用 gradle -q task名称 的方式运行会没有效果
* 使用 gradle task名称 的方式运行才有效果*/
ant.echo(message: 'Ant 任务的引用')
println 'chant'
}
3.times {
task "yayGradle$it" << {
println '动态任务的定义' + it
}
}
/* dependsOn 说明 task 之间的依赖关系，Gradle 会确保被依赖的 task 总会在定义该依赖的 task 之前执行 */
yayGradle0.dependsOn startSession
yayGradle2.dependsOn yayGradle1, yayGradle0
/* 任务执行的顺序 startSession -> yayGradle0 -> yayGradle1 -> yayGradle2 -> groupTherapy */
task groupTherapy(dependsOn: yayGradle2) << {
println 'groupTherapy'
}gradle -q task名称 使Gradle只显示对应 task 相关信息
task 代表一个任务 doLast 代表 task 最后执行的一个 action doLast 可以使用 << 更简单的来表达
gradle task --all 查询所有的可以知晓的任务
www.coderknock.com$ gradle task --all
The Task.leftShift(Closure) method has been deprecated and is scheduled to be removed in Gradle 5.0. Please use Task.doLast(Action) instead.
at build_88ntbwtq2gz525a8g5uy5gmc2.run(D:\Windows\Desktop\LearnGradle\HelloWorld\build.gradle:7)
:tasks
------------------------------------------------------------
All tasks runnable from root project
------------------------------------------------------------构建的 setip 任务，帮助初始化 Gradle 的构建（比如生成 build.gradle 文件）
Build Setup tasks ----------------- init - Initializes a new Gradle build. [incubating] wrapper - Generates Gradle wrapper files. [incubating]
帮助任务组，这里列出了任务的名称以及对应描述
Help tasks ---------- buildEnvironment - Displays all buildscript dependencies declared in root project 'HelloWorld'. components - Displays the components produced by root project 'HelloWorld'. [incubating] dependencies - Displays all dependencies declared in root project 'HelloWorld'. dependencyInsight - Displays the insight into a specific dependency in root project 'HelloWorld'. dependentComponents - Displays the dependent components of components in root project 'HelloWorld'. [incubating] help - Displays a help message. model - Displays the configuration model of root project 'HelloWorld'. [incubating] projects - Displays the sub-projects of root project 'HelloWorld'. properties - Displays the properties of root project 'HelloWorld'. tasks - Displays the tasks runnable from root project 'HelloWorld'.
没有分类的任务【目前列出的是我们刚刚声明的任务，自己生命的任务也可以设置任务组】，后期会学习如何添加描述信息
Other tasks ----------- groupTherapy helloworld helloworldSort startSession yayGradle0 yayGradle1 yayGradle2 BUILD SUCCESSFUL Total time: 1.29 secs
每个构建脚本都会默认暴露 Help tasks 任务组，如果某个 task 不属于一个任务组，就会显示在 Other tasks 中。
任务执行
www.coderknock.com$ gradle yayGradle0 groupTherapy :startSession startSession [ant:echo] Ant 任务的引用 chant :yayGradle0 动态任务的定义task ':yayGradle0' :yayGradle1 动态任务的定义task ':yayGradle1' :yayGradle2 动态任务的定义task ':yayGradle2' :groupTherapy groupTherapy BUILD SUCCESSFUL Total time: 1.61 secs
www.coderknock.com$ gradle groupTherapy :startSession startSession [ant:echo] Ant 任务的引用 chant :yayGradle0 动态任务的定义task ':yayGradle0' :yayGradle1 动态任务的定义task ':yayGradle1' :yayGradle2 动态任务的定义task ':yayGradle2' :groupTherapy groupTherapy BUILD SUCCESSFUL Total time: 1.614 secs
我们可以看到 gradle yayGradle0 groupTherapy与gradle groupTherapy两者的运行结果是相同的，这是因为 groupTherapy与yayGradle0直接有依赖关系，这样可以保证被依赖的任务只执行一次，并且任务间的执行顺序按照依赖关系进行。
www.coderknock.com$ gradle gT :startSession startSession [ant:echo] Ant 任务的引用 chant :yayGradle0 动态任务的定义task ':yayGradle0' :yayGradle1 动态任务的定义task ':yayGradle1' :yayGradle2 动态任务的定义task ':yayGradle2' :groupTherapy groupTherapy BUILD SUCCESSFUL Total time: 1.43 secs
Gradle 提供了以驼峰式缩写在命令行上运行命令的方式，我们可以通过如上面一样的gradle gT这样的命令来达到gradle groupTherapy这样的效果。其中要确保任务名字的缩写是唯一的不然会有如下报错效果：
www.coderknock.com$ gradle yG FAILURE: Build failed with an exception. * What went wrong: Task 'yG' is ambiguous in root project 'HelloWorld'. Candidates are: 'yayGradle0', 'yayGradle1', 'yayGradle2'. * Try: Run gradle tasks to get a list of available tasks. Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. BUILD FAILED Total time: 1.296 secs
我们应该使用yG0来代替yayGradle0
www.coderknock.com$ gradle groupTherapy -x yG0 :yayGradle1 动态任务的定义task ':yayGradle1' :yayGradle2 动态任务的定义task ':yayGradle2' :groupTherapy groupTherapy BUILD SUCCESSFUL Total time: 1.378 secs
使用-x参数，我们可以智能排除任务中对应的依赖任务及其相关依赖
使用gradle -h我们可以查询gradle可用参数
www.coderknock.com$ gradle -h USAGE: gradle [option...] [task...] -?, -h, --help 显示此帮助消息。Shows this help message. -a, --no-rebuild 不重新生成项目依赖项。Do not rebuild project dependencies. -b, --build-file 指定生成文件。Specifies the build file. -c, --settings-file 指定的设置文件。Specifies the settings file. --configure-on-demand 只有相关的项目中运行此生成配置。这意味着更快的生成，实现大型多项目生成。[孵化中]Only relevant projects are configured in this build run. This means faster build for large multi-project builds. [incubating] --console 指定哪种类型的控制台输出生成。值是 '普通'、 '自动' （默认值） 或 '详细'。Specifies which type of console output to generate. Values are 'plain', 'auto' (default) or 'rich'. --continue 当一个任务执行失败后继续执行任务。Continues task execution after a task failure. -D, --system-prop 设置系统属性的 JVM (例如 Dmyprop = myvalue)。Set system property of the JVM (e.g. -Dmyprop=myvalue). -d, --debug 在调试模式下打印日志（包括异常堆栈）。 Log in debug mode (includes normal stacktrace). --daemon 使用 Gradle 守护进程来进行构建，如果没有运行的守护进程则启动一个。Uses the Gradle Daemon to run the build. Starts the Daemon if not running. --foreground 在前台启动 Gradle 守护进程。[孵化中]Starts the Gradle Daemon in the foreground. [incubating] -g, --gradle-user-home 指定 gradle 用户的主目录。Specifies the gradle user home directory. --gui 启动 Gradle GUI。Launches the Gradle GUI. -I, --init-script 指定初始化脚本。Specifies an initialization script. -i, --info 将日志级别设置为info。Set log level to info. --include-build Includes the specified build in the composite. [incubating] -m, --dry-run 禁用所有任务的操作来进行构建。Runs the builds with all task actions disabled. --max-workers 配置 Gradle 允许使用的并发的数目。[孵化]Configure the number of concurrent workers Gradle is allowed to use. [incubating] --no-daemon 不适用守护进程构建。Do not use the Gradle Daemon to run the build. --no-scan Disables the creation of a build scan. [incubating] --offline 构建而不访问网络资源（使用本地缓存）。The build should operate without accessing network resources. -P, --project-prop 设置项目属性的生成脚本 (例如 Pmyprop = myvalue)。Set project property for the build script (e.g. -Pmyprop=myvalue). -p, --project-dir Gradle 指定的起始目录。默认为当前目录。Specifies the start directory for Gradle. Defaults to current directory. --parallel 并行构建项目。Gradle将尝试测定最佳线程数。Build projects in parallel. Gradle will attempt to determine the optimal number of executor threads to use. [incubating] --profile 配置构建生成时间，并且在<build_dir>/reports/profile 生成对应的报告。Profiles build execution time and generates a report in the <build_dir>/reports/profile directory. --project-cache-dir 指定特定于项目的缓存目录。默认值为.gradle 的项目根目录中。Specifies the project-specific cache directory. Defaults to .gradle in the root project directory. -q, --quiet Log errors only. --recompile-scripts 重新编译构建脚本。Force build script recompiling. --refresh-dependencies 刷新依赖关系的状态。Refresh the state of dependencies. --rerun-tasks 忽略以前缓存的任务。Ignore previously cached task results. -S, --full-stacktrace 打印出所有异常堆栈信息（非常详细）。Print out the full (very verbose) stacktrace for all exceptions. -s, --stacktrace 打印出所有异常堆栈信息。Print out the stacktrace for all exceptions. --scan 创建一个构建扫描。如果尚未应用构建扫描插件，Gradle 将失败的生成。[孵化中]Creates a build scan. Gradle will fail the build if the build scan plugin has not been applied. [incubating] --status 显示运行的和最近停止的守护进程的状态信息。 Gradle Daemon(s)。Shows status of running and recently stopped Gradle Daemon(s). --stop 如果有守护进程在运行则停止守护进程。Stops the Gradle Daemon if it is running. -t, --continuous 允许连续构建。Gradle在构建完成后不退出，并在任务文件变化时重新构建。Enables continuous build. Gradle does not exit and will re-execute tasks when task file inputs change. [incubating] -u, --no-search-upward 不在父文件夹中搜索 settings.gradle。Don't search in parent folders for a settings.gradle file. -v, --version 打印版本信息。Print version info. -x, --exclude-task 指定要排除执行的任务。Specify a task to be excluded from execution.
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