Gradle Kotlin DSL无法识别buildscript中的ext [英] ext in buildscript can not be recognised by Gradle Kotlin DSL

问题描述

这几天，我正在尝试编写一些代码来体验Spring 5中的Spring反应特性和kotlin扩展，并且我还准备了一个gradle Kotlin DSL build.gradle.kt来配置gradle构建.

In these days, I am trying to write some codes to experience the Spring reactive features and kotlin extension in Spring 5, and I also prepared a gradle Kotlin DSL build.gradle.kt to configure the gradle build.

build.gradle.kt是从 http://start.spring.io 生成的Spring Boot模板代码转换而来的

The build.gradle.kt is converted from Spring Boot template codes generated by http://start.spring.io.

但是Gradle无法检测到buildscript中的ext.

But the ext in the buildscript can not be detected by Gradle.

buildscript {
  ext { }
}

ext将导致Gradle构建错误.

The ext will cause Gradle build error.

为了使classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion")和compile("org.jetbrains.kotlin:kotlin-stdlib-jre8:$kotlinVersion")中的变量起作用，我以困难的方式添加了变量.

To make the variables in classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion") and compile("org.jetbrains.kotlin:kotlin-stdlib-jre8:$kotlinVersion") work, I added the variables in the hard way.

val kotlinVersion = "1.1.4"
val springBootVersion = "2.0.0.M3"

但是我必须在全局顶部声明它们，并在buildscript中重复它们.

But I have to declare them in global top location and duplicate them in the buildscript.

代码: https://github.com/hantsy/spring-reactive-sample/blob/master/kotlin-gradle/build.gradle.kts

是否有一种使ext工作正常的方法?

Is there a graceful approach to make ext work?

更新:有一些丑陋的方法:

Update: There are some ugly approaches:

1. 从Gradle Kotlin DSL示例中， https://github.com/gradle/kotlin-dsl/tree/master/samples/project-properties ，在gradel.properties中声明属性.

1. From Gradle Kotlin DSL example, https://github.com/gradle/kotlin-dsl/tree/master/samples/project-properties, declares the properties in gradel.properties.

kotlinVersion = 1.1.4
springBootVersion = 2.0.0.M3

并在build.gradle.kts中使用它.

And use it in build.gradle.kts.

buildScript{
   val kotlinVersion by project

}
 val kotlinVersion by project //another declare out of buildscript block.

与上述类似，在buildScript块中声明它们:

Similar with above declare them in buildScript block:

buildScript{
   extra["kotlinVersion"] = "1.1.4"
   extra["springBootVersion"] = "2.0.0.M3"
   val kotlinVersion: String by extra

}
 val kotlinVersion: String by extra//another declare out of buildscript block.

如何避免重复 val kotlinVersion:多余的字符串?

推荐答案

随着Kotlin DSL ext的增加，它可以在buildscript下使用.

With Kotlin DSL ext has been changed to extra and it can be used under buildscript.

例如:-

buildscript {
    // Define versions in a single place
    extra.apply{
        set("minSdkVersion", 26)
        set("targetSdkVersion", 27)
    }
}

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