Groovy 脚本变量
对于 Groovy DSL 用户来说，了解 Groovy 如何处理脚本变量非常重要。 Groovy 有两种类型的脚本变量。一种具有本地范围，一种具有脚本范围范围。
示例：变量范围：本地和脚本范围
范围.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()输出
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。
配置和执行阶段
请务必记住，Gradle 具有独特的配置和执行阶段（请参阅构建生命周期）。
Example 1. Distinct configuration and execution phase
build.gradle.kts
val classesDir = file("build/classes")
classesDir.mkdirs()
tasks.register<Delete>("clean") {
delete("build")
}
tasks.register("compile") {
dependsOn("clean")
val classesDir = classesDir
doLast {
if (!classesDir.isDirectory) {
println("The class directory does not exist. I can not operate")
// do something
}
// do something
}
}build.gradle
def classesDir = file('build/classes')
classesDir.mkdirs()
tasks.register('clean', Delete) {
delete 'build'
}
tasks.register('compile') {
dependsOn 'clean'
def localClassesDir = classesDir
doLast {
if (!localClassesDir.isDirectory()) {
println 'The class directory does not exist. I can not operate'
// do something
}
// do something
}
}输出
gradle -q compile> gradle -q compile The class directory does not exist. I can not operate
由于目录的创建发生在配置阶段，因此clean任务会在执行阶段删除该目录。