从命令行绑定变量以测试Groovy脚本

Question

I have a groovy script used in conjunction with GroovyScriptEngine:

public static void main(String[] args) {
    GroovyScriptEngine gse = new GroovyScriptEngine(new String[] {"/home/user/tmp"});
    Binding varSet = new Binding();
    varSet.setVariable("testVar", "Hello World");
    gse.run("printHello.groovy", varSet);
}

This is running just fine from java. The printHello.groovy starts keeping as already defined all the bound variables. The script "/home/user/tmp/printHello.groovy" is something like this:

println("${testVar} !!!")

What I want is to be able to test this script calling it from command line, but I haven't found a way to pass the binding variables to my script.

$ groovy printHello.groovy [???]

That could be very useful for testing.

Answer 1

You can just pass the arguments You need after the script invocation:

$ groovy groovyAuthDefault.groovy user pass

In the script all the parameters are accessible via args variable. More info .

Is that what You were looking for?

UPDATE

Found solution but it has some limitations, maybe it's possible to bypass them but don't know exactly how. As I wrote above when You invoke script from command line You can pass arguments that are kept in args list. The problem lies in the fact that GroovyScriptEngine doesn't invoke the external script with it's main method - there's no args list so it fails with an MissingPropertyException . The idea is to set fake args .

java :

public static void main(String[] args) {
    GroovyScriptEngine gse = new GroovyScriptEngine(new String[] {"/home/user/tmp"});
    Binding varSet = new Binding();
    varSet.setVariable("testVar", "Hello World");
    varSet.setVariable("args", null); //null, empty string, whatever evaluates to false in groovy
    gse.run("printHello.groovy", varSet);
}

printHello.groovy :

if(args) {
    setBinding(new Binding(Eval.me(args[0])))
}
println("${testVar} !!!")

In printHello.groovy args is checked. If it evaluates to true it means that script was invoked from command line with arguments and a new Binding is set - evaluated from first element of arguments passed (plain groovy script extends groovy.lang.Script . If args evaluates to false it means that script was run with GroovyScriptEngine .

Command line invocation:

groovy printHello.groovy [testVar:\'hi\']

Exception handling might be added with other improvements as well. Hope that helps.