Java calls Jython

1. A Java excuse class that can be mapped to Jython objects

1. Package com. newbee;
3. Public interface EmployeeType {
5. Public String getEmployeeFirst ();
6. Public String getEmployeeLast ();
7. Public String getEmployeeId ();
8. Public void setEmployeeId ();
10. }

2. A factory method class for obtaining Java objects, Jython objects, and Jython function objects from Jython files

1. Package com. newbee;
3. Import java. util. HashMap;
5. Import org. python. core. PyFunction;
6. Import org. python. core. PyObject;
7. Import org. python. util. PythonInterpreter;
9. Public class JythonFactory {
11. Private static final JythonFactory instance = new JythonFactory ();
12. Private static final HashMap <String, PythonInterpreter> piMap = new HashMap <String, PythonInterpreter> ();
14. Public static JythonFactory getInstance (){
15. Return instance;
16. }
18. Public Object getJavaObjectFromJythonFile (String interfaceName, String pathToJythonModule ){
20. Object javaObject = null;
22. PythonInterpreter interpreter = cacheInterpreter (pathToJythonModule );
24. String tempName = pathToJythonModule. substring (pathToJythonModule. lastIndexOf ("/") + 1 );
25. TempName = tempName. substring (0, tempName. indexOf ("."));
26. System. out. println (tempName );
27. String instanceName = tempName. toLowerCase ();
28. String javaClassName = tempName. substring (0, 1). toUpperCase () + tempName. substring (1 );
29. String objectDef = "=" + javaClassName + "()";
30. Interpreter.exe c (instanceName + objectDef );
31. Try {
32. Class JavaInterface = Class. forName (interfaceName );
33. JavaObject = interpreter. get (instanceName). _ tojava _ (JavaInterface );
34. } Catch (ClassNotFoundException ex ){
35. Ex. printStackTrace (); // Add logging here
36. }
38. Return javaObject;
39. }
41. Public PyObject getPyObjectFromJythonFile (String typeName, String pathToJythonModule ){
43. PyObject pyObject = null;
44. PythonInterpreter interpreter = cacheInterpreter (pathToJythonModule );
46. String instanceName = typeName. toLowerCase ();
47. String objectDef = "=" + typeName + "()";
48. Interpreter.exe c (instanceName + objectDef );
49. PyObject = interpreter. get (instanceName );
51. Return pyObject;
52. }
54. Public PyFunction getPyFunctionFromJythonFile (String funcName, String pathToJythonModule ){
56. PyFunction pyFunction = null;
57. PythonInterpreter interpreter = cacheInterpreter (pathToJythonModule );
58. PyFunction = (PyFunction) interpreter. get (funcName, PyFunction. class );
60. Return pyFunction;
61. }
63. Private pythoninterpreter cacheinterpreter (string pathtojythonmodule ){
64. Pythoninterpreter interpreter = NULL;
65. If (pimap. Get (pathtojythonmodule )! = NULL ){
66. Interpreter = pimap. Get (pathtojythonmodule );
67. } Else {
68. Interpreter = new pythoninterpreter ();
69. Interpreter.exe cfile (pathtojythonmodule );
70. }
71. Return interpreter;
72. }
74. }

3. Jython script file Employee. py

1. # Jython source file
2. From com. newbee import EmployeeType
4. Class Employee (EmployeeType ):
5. Def _ init _ (self ):
6. Self. first = "Sean"
7. Self. last = "Guo"
8. Self. id = "731"
9. Def getEmployeeFirst (self ):
10. Return self. first
12. Def getEmployeeLast (self ):
13. Return self. last
15. Def getEmployeeId (self ):
16. Return self. id
18. Def setEmployeeId (self, newId ):
19. Self. id = newId
21. Def getNunmberValue (seed ):
22. V0 = 0
23. For I in range (1, seed + 1 ):
24. V0 + = I
25. Return v0

4. Use the methods of the above classes

1. Package com. newbee;
3. Import java. util. regex. Matcher;
4. Import java. util. regex. Pattern;
6. Import org. python. core. PyException;
7. Import org. python. core. PyFunction;
8. Import org. python. core. PyInteger;
9. Import org. python. core. PyObject;
10. Import org. python. core. PyString;
12. Public class SimpleEmbedded {
13. Public static void main (String [] args) throws PyException {
15. // Java
16. EmployeeType eType = (EmployeeType) JythonFactory. getInstance (). getJavaObjectFromJythonFile ("com. newbee. EmployeeType", "jylib/Employee. py ");
17. System. out. println ("Employee Name:" + eType. getEmployeeFirst () + "" + eType. getEmployeeLast ());
18. System. out. println ("Employee ID:" + eType. getEmployeeId ());
20. // Jython
21. PyObject pyObject = JythonFactory. getInstance (). getPyObjectFromJythonFile ("Employee", "jylib/Employee. py ");
22. System. out. println ("++ =" + pyObject. invoke ("getEmployeeId "));
23. PyObject. invoke ("setEmployeeId", new PyString ("1999 "));
24. System. out. println ("++ =" + pyObject. invoke ("getEmployeeId "));
26. // Jython Function
27. PyFunction pyFunction = JythonFactory. getInstance (). getPyFunctionFromJythonFile ("getNunmberValue", "jylib/Employee. py ");
28. System. out. println ("*** =" + pyFunction. _ call _ (new PyInteger (10 )));
30. }
31. }