Groovy script variables 4. Groovy 脚本变量
对于 Groovy DSL 的用户来说，了解 Groovy 如何处理脚本变量非常重要。 有两种类型的脚本变量。 一个具有本地作用域，另一个具有脚本范围。
Example: Variables scope: local and script wide 示例: 变量范围: 本地范围和脚本范围
scope.groovy
String localScope1 = 'localScope1' def localScope2 = 'localScope2' scriptScope = 'scriptScope' println localScope1 println localScope2 println scriptScope closure = { println localScope1 println localScope2 println scriptScope } def method() { try { localScope1 } catch (MissingPropertyException e) { println 'localScope1NotAvailable' } try { localScope2 } catch(MissingPropertyException e) { println 'localScope2NotAvailable' } println scriptScope } closure.call() method()
Output of 产量groovy scope.groovy
> groovy scope.groovy localScope1 localScope2 scriptScope localScope1 localScope2 scriptScope localScope1NotAvailable localScope2NotAvailable scriptScope
使用类型修饰符声明的变量在闭包中可见，但在方法中不可见。
Configuration and execution phase 配置和执行阶段
记住 Gradle 有一个独特的配置和执行阶段是很重要的(请参阅构建生命周期)。
build.gradle
def classesDir = file('build/classes') classesDir.mkdirs() task clean(type: Delete) { delete 'build' } task compile { dependsOn 'clean' doLast { if (!classesDir.isDirectory()) { println 'The class directory does not exist. I can not operate' // do something } // do something } }
> gradle -q compile The class directory does not exist. I can not operate
在配置阶段创建目录时，清理任务会在执行阶段删除目录。
