Can anyone show me a working simple example (java + python code) of calling python script from java code by passing parameters and getting back the results?
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this was the first result when I google it. bytes.com/topic/python/insights/…hcarrasko– hcarrasko2014-12-01 19:03:29 +00:00Commented Dec 1, 2014 at 19:03
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I've already tried that, but the sample codes I've googled are not as simple I can understand, or simply not working.elaspog– elaspog2014-12-01 19:03:43 +00:00Commented Dec 1, 2014 at 19:03
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Already tried that. But "python.exec("number3 = number1+number2");" is not not a script beeing called.elaspog– elaspog2014-12-01 19:06:12 +00:00Commented Dec 1, 2014 at 19:06
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Ideally, since this is Java (you don't use Android, do you?), use Jython to run the script!fge– fge2014-12-01 19:07:22 +00:00Commented Dec 1, 2014 at 19:07
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1 Answer
Try using Java ScriptEngine to run the code as Jython.
Sample program:
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) throws ScriptException {
ScriptEngine engine = new ScriptEngineManager().getEngineByName("python");
// Using the eval() method on the engine causes a direct
// interpretataion and execution of the code string passed into it
engine.eval("import sys");
engine.eval("print sys");
// Using the put() method allows one to place values into
// specified variables within the engine
engine.put("a", "42");
// As you can see, once the variable has been set with
// a value by using the put() method, we an issue eval statements
// to use it.
engine.eval("print a");
engine.eval("x = 2 + 2");
// Using the get() method allows one to obtain the value
// of a specified variable from the engine instance
Object x = engine.get("x");
System.out.println("x: " + x);
}
}
You'll need to include the jython engine jar in your classpath. look for it here
