Jython:java How to pass a value to Python

To invoke a Python script in a Java project, the most important thing is that the Python script needs to use the variables that are passed in real time in Java. So trouble, looking around for tutorials.

Chinese tutorial is zero, fortunately there is stack over Flow, input keywords: jython java passing variable Topython, really found a case. The following is the translation of the content:

I'm using jython2.7.0, I want to pass the Java command line parameters through Jython to the Python script, the result is completely unexpected, the code is as follows:

string[] Arguments ={"arg1", "arg2", "Arg3"}; Pythoninterpreter.initialize (Props,system.getproperties (), arguments); Org.python.util.PythonInterpreterpython = New Org.python.util.PythonInterpreter (); StringWriter out = Newstringwriter ();p ython.setout (out);p ython.execfile ("myscript.py"); String outputstr =out.tostring (); System.out.println (OUTPUTSTR);

the problem with the code running is that the pass value failed. This means that the interface is not properly invoked. Here are two answers (not tested):

Author's supplementary reply :

string[] Arguments ={"myscript.py", "Arg1", "arg2", "Arg3"}; Pythoninterpreter.initialize (System.getproperties (), system.getproperties (), arguments); O Rg.python.util.PythonInterpreterpython = new Org.python.util.PythonInterpreter (); StringWriter out = Newstringwriter ();p ython.setout (out);p ython.execfile ("myscript.py"); String outputstr =out.tostring (); System.out.println (OUTPUTSTR);

Notice in the first line that the author passed the script through arg[0].

other people reply :

Import Org.python.core.py;import Org.python.core.pyexception;import Org.python.core.pyobject;import Org.python.core.pystring;importorg.python.core.__builtin__;importorg.python.util.pythoninterpreter; public class Jythontest {public static void main (string[] args) {Pythoninterpreter interpreter = Newpythonint        Erpreter ();        String Fileurlpath = "/path/to/script";        String scriptname = "MyScript"; Interpreter.exec ("importsys\n" + "import OS \ n" + "Sys.path.append ('" +fileurlpath + ") \ n" + "from" +scriptname+ "Import *        \ n ");        String funcName = "MyFunction";        Pyobject somefunc =interpreter.get (funcName);        if (SomeFunc = = null) {throw new Exception ("Could notfind Python function:" + funcName);        } try {somefunc.__call__ (newpystring (arg1), New Pystring (ARG2), New pystring (ARG3));        } catch (Pyexception e) {e.printstacktrace (); }    }}

Note that each other creates a Python script called myscript.py in the Directory/path/to/script directory:

def myscript (ARG1,ARG2,ARG3):    print "Calling Python function withparamters:"    print arg1    print arg2    Print Arg3

Pro-Test:

Importjava.io.ioexception;importorg.python.util.pythoninterpreter;  public class Test {public     static void Main (string[] args) throws IOException {          int[] arg = {3,6};         Pythoninterpreter.initialize (System.getproperties (), System.getproperties (), new string[0]);         Pythoninterpreter interpreter = new Pythoninterpreter ();          Interpreter.exec ("a=" + arg[0]+ "\ n");         Interpreter.exec ("b=" +arg[1] + "\ n");         Interpreter.exec ("Print b/a");          Pass the address         String Txt_path = "\\python\\sample.txt";         Interpreter.exec ("Txt_path = \" "+ Txt_path +" \ "");         Interpreter.exec ("Print Txt_path");    } Main

Reference question and Answer: How topassarguments to Python script in Java using Jython

Jython:java How to pass a value to Python