“命令链”功能：允许在顶层语句的方法调用的参数周围省略括号。也就是在参数周围不需要括号，也不需要链接调用之间的点号。 DSL(Domain Specific Languages 领域定义语言)以简化代码，Groovy中的DSL：
代码语言：javascript复制class EmailDsl {
String toText
String fromText
String body
/**
* This method accepts a closure which is essentially the DSL. Delegate the
* closure methods to
* the DSL class so the calls can be processed
*/
def static make(closure) {
EmailDsl emailDsl = new EmailDsl()
// any method called in closure will be delegated to the EmailDsl class
closure.delegate = emailDsl
closure()
}
/**
* Store the parameter as a variable and use it later to output a memo
*/
def to(String toText) {
this.toText = toText
}
def from(String fromText) {
this.fromText = fromText
}
def body(String bodyText) {
this.body = bodyText
}
}
EmailDsl.make {
to "Nirav Assar"
from "Barack Obama"
body "How are things? We are doing well. Take care"
}其结果为：
代码语言：javascript复制How are things? We are doing well. Take care
