04.Kotlin与Gradle

Kotlin 之 Gradle 基础

gradle project 和 task

用 kotlin 自定义 task

gradle 依赖

gradle 生命周期

1. 扫描
2. 执行

task("opendoor", {
    println("open door scan1") // 扫描阶段
    doFirst({
        println("open door first") // 运行阶段
    })
    println("open door scan2") // 扫描阶段
    doLast({
        println("open door last") // 运行阶段
    })
})
task("putelephant", {
    println("put elephant scan")
    doFirst({
        println("put elephant first")
    })
    doLast({
        println("put elephant last")
    })
}).dependsOn("opendoor")
task("closedoor", {
    println("close door scan")
    doFirst({
        println("close door first")
    })
    doLast({
        println("close door last")
    })
}).dependsOn("putelephant")

Tasks 任务集

多个任务的合集就是任务集

tasks { // 定义一堆任务
  "xxx"{
   }
}

gradle 默认 tasks，用命令 gradle tasks 查看默认 task

defaultTasks，定义 gradle 不输入 task 执行的默认 task

Gradle 增量更新

inputs.dir
inputs.file
outputs.dir
outputs.file

案例：把源代码的文件路径记录下来

task("getsrcname", {
    var outputfile = file("ouput.txt")
    doLast {
        var srcDir = fileTree("src")
        srcDir.forEach({
            if (it.isFile) {
                Thread.sleep(1000)
                outputfile.appendText(it.absolutePath)
                outputfile.appendText("\r\n")
            }
        })
    }
})

未加入增量更新，如果没有变化，每次运行都需要 3s，加入只需要 0s，没有变化的 task 会是 UP-TO-DATE 状态

task("getsrcname", {
    var outputfile = file("ouput.txt")
    inputs.dir("src")
    outputs.file(outputfile)
    doLast {
        var srcDir = fileTree("src")
        srcDir.forEach({
            if (it.isFile) {
                Thread.sleep(1000)
                outputfile.appendText(it.absolutePath)
                outputfile.appendText("\r\n")
            }
        })
    }
})

Gradle 常见插件

插件就是包含一个或多个 task 的合集

1. application
2. java
3. war

Kotlin 之 Gradle DSL

https://github.com/gradle/kotlin-dsl
https://blog.gradle.org/kotlin-meets-gradle

build.gradle 转 build.gradle.kts

settings.gradle

include

include ':lancet-base'
project(':lancet-base').projectDir = File('lancet/lancet-base')
include ':lancet-weaver'
project(':lancet-weaver').projectDir = File('lancet/lancet-weaver')
include ':lancet-plugin'
project(':lancet-plugin').projectDir = File('lancet/lancet-plugin')

kotlin script:

include(":lancet-base")
project(":lancet-base").projectDir = File("lancet/lancet-base")
include(":lancet-weaver")
project(":lancet-weaver").projectDir = File("lancet/lancet-weaver")
include(":lancet-plugin")
project(":lancet-plugin").projectDir = File("lancet/lancet-plugin")

resolutionStrategy.dependencySubstitution substitute

• groovy

configurations.all {
    resolutionStrategy.dependencySubstitution {
        substitute module("org.utils:api") using project(":api") because "we work with the unreleased development version"
        substitute module("org.utils:util:2.5") using project(":util")
    }
}

• kts

configurations.all {
    resolutionStrategy.dependencySubstitution {
        substitute(module("org.utils:api"))
            .using(project(":api")).because("we work with the unreleased development version")
        substitute(module("org.utils:util:2.5")).using(project(":util"))
    }
}