Gradle 实战 - 命令行传递-ApiHug准备-工具篇-013

🤗 ApiHug × {Postman|Swagger|Api...} = 快↑ 准√ 省↓

GitHub - apihug/apihug.com: All abou the Apihug
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ApiHug 整个工具链基于 Gradle, 使用 ApiHug 准备工作最先需要学习的就是 gradle. 工欲善其事,必先利其器

命令行参数是动态控制查询运行时 profile 主要方式之一，同理 gradle 也提供了参数传入机制。

#参数类型

两种类型的参数：

系统配置参数 -D 标志
项目配置参数 -P 标志

添加参数打印：

apply plugin: "java"
description = "Gradle Command Line Arguments examples"

task propertyTypes(){
    doLast{
        if (project.hasProperty("args")) {
            println "Our input argument with project property ["+project.getProperty("args")+"]"
        }
        println "Our input argument with system property ["+System.getProperty("args")+"]"
    }
}

运行操作如下:

> .\gradlew.bat  cmd-line-args:propertyTypes -Dargs=dear -Pargs=xue   

> Task :cmd-line-args:propertyTypes
Our input argument with project property [xue]
Our input argument with system property [dear]

#命令行参数传递

上面有读取参数的方式，那么如何参数传递到我们的 main 函数？

apply plugin: "java"
apply plugin: "application"
description = "Gradle Command Line Arguments examples"

ext.javaMainClass = "com.dearxue.cmd.MainClass"

application {
    mainClassName = javaMainClass
}

java 方法如下：


public class MainClass {
  public static void main(String[] args) {
    System.out.println("JAVA - Gradle command line arguments example");
    for (String arg : args) {
      System.out.println("JAVA - Got argument [" + arg + "]");
    }
  }
}

运行如下：

> .\gradlew.bat  cmd-line-args:run --args="may the force be with you"

> Task :cmd-line-args:run
JAVA - Gradle command line arguments example
JAVA -  Got argument [may]
JAVA -  Got argument [the]
JAVA -  Got argument [force]
JAVA -  Got argument [be]
JAVA -  Got argument [with]
JAVA -  Got argument [you]

Application 的 run 任务自动你参数处理了， JavaExec 就不一样，需要写操作如下：

if (project.hasProperty("args")) {
    ext.cmdargs = project.getProperty("args")
} else {
    ext.cmdargs = "ls"
}

task cmdLineJavaExec(type: JavaExec) {
    group = "Execution"
    description = "Run the main class with JavaExecTask"
    classpath = sourceSets.main.runtimeClasspath
    mainClass = javaMainClass
    args cmdargs.split()
}

输出结果同样：

> .\gradlew.bat  cmd-line-args:cmdLineJavaExec  -Pargs="may the force be with you"

> Task :cmd-line-args:cmdLineJavaExec
JAVA - Gradle command line arguments example
JAVA -  Got argument [may]
JAVA -  Got argument [the]
JAVA -  Got argument [force]
JAVA -  Got argument [be]
JAVA -  Got argument [with]
JAVA -  Got argument [you]

#Exec 传递参数到第三方应用

task cmdLineExec(type: Exec) {
    group = "Execution"
    description = "Run an external program with ExecTask"
    commandLine cmdargs.split()
}

执行：

$ ./gradlew cmdLineExec -Pargs="ls -ll"

> Task :cmd-line-args:cmdLineExec
total 4
drwxr-xr-x 1 user 1049089    0 Sep  1 17:59 bin
drwxr-xr-x 1 user 1049089    0 Sep  1 18:30 build
-rw-r--r-- 1 user 1049089 1016 Sep  3 15:32 build.gradle
drwxr-xr-x 1 user 1049089    0 Sep  1 17:52 src