英文:
Invoke java method from Groovy
问题
我正在研究Groovy，并且尝试在Groovy中绑定Java对象并从脚本中运行方法。
示例：
public class Toaster {private int toasted = 0;public Toaster() {super();}public void toast() {System.out.println(++toasted);}}
在Java的主程序中：
Toaster toaster = new Toaster();Binding binding = new Binding();binding.setVariable("toaster", toaster);GroovyShell shell = new GroovyShell(binding);shell.evaluate("toaster.toast();");
这显然无法正常工作，那么我需要在这里做些什么才能够在Groovy中使用Java的烤面包机对象呢？
英文:
I'm looking into Groovy, and I'm trying to bind java objects in groovy and run methods from the script.
Example:
public class Toaster{private int toasted=0;public Toaster() {super();}public void toast(){System.out.println(++toasted);}}
And in the java main I have:
Toaster toaster = new Toaster();Binding binding = new Binding();binding.setVariable("toaster", toaster);GroovyShell shell = new GroovyShell(binding);shell.evaluate("toaster.toast();");
This obviously doesn't work, so what do I need to do here to be able to use the java toaster object from groovy?
答案1
得分: 2
以下是你提供的代码的翻译部分：
A.java:
import groovy.lang.GroovyShell;import groovy.lang.Binding;public class A{public static class Toaster{private int toasted=0;public void toast(){System.out.println(++toasted);}}public static void main(String[] arg){Toaster toaster = new Toaster();Binding binding = new Binding();binding.setVariable("toaster", toaster);GroovyShell shell = new GroovyShell(binding);shell.evaluate("toaster.toast();"); // < prints 1shell.evaluate("toaster.toast();"); // < prints 2shell.evaluate("toaster.toast();"); // < prints 3shell.evaluate("toaster.toast();"); // < prints 4}}
编译：
javac -cp %GROOVY_HOME%/lib/* A.java
运行：
java -cp %GROOVY_HOME%/lib/*;. A
英文:
your code works fine if you remove all typos...
A.java:
import groovy.lang.GroovyShell;import groovy.lang.Binding;public class A{public static class Toaster{private int toasted=0;public void toast(){System.out.println(++toasted);}}public static void main(String[] arg){Toaster toaster = new Toaster();Binding binding = new Binding();binding.setVariable("toaster", toaster);GroovyShell shell = new GroovyShell(binding);shell.evaluate("toaster.toast();"); // < prints 1shell.evaluate("toaster.toast();"); // < prints 2shell.evaluate("toaster.toast();"); // < prints 3shell.evaluate("toaster.toast();"); // < prints 4}}
compile:
javac -cp %GROOVY_HOME%/lib/* A.java
run:
java -cp %GROOVY_HOME%/lib/*;. A
答案2
得分: 0
Groovy和Java将被编译成相同的字节码，保存为.class文件。因此，您不需要Groovy shell。我不确定您在这里的具体安排。但如果它们需要同时编译，我建议您使用Groovy的编译器groovyc进行编译，以便它可以识别Java代码的一侧。
英文:
Groovy and java will be compiled to the same bytecode as .class file. So, you don't need groovy shell. I am not sure what your arrangement here. But if they both need to be compiled at the same time, I suggest you use Groovy's compiler groovyc to compile, so it can recognize Java side of the code.
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