Javassist: Enhanced Java Reflection tool to get method parameter names

Java reflection is not able to get the parameter name of the method. Like what:

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1. Public String concatstring (String str1,string str2) {

2. return str1+str2;

3. }

public string concatstring (string str1,string str2) {return str1+str2; }

to get the parameter name "STR1", and "str1", it is not possible to use the reflection from the JDK. But we use third-party packagesJavaassistcan be obtained.

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2. Public Static void Main (string[] args) {

4. Class clazz = testjavaassist. class;

6. Try {

8. Classpool pool = Classpool.getdefault ();

10. Ctclass cc = Pool.get (Clazz.getname ());

12. Ctmethod cm = Cc.getdeclaredmethod ("concatstring");

16. //Use Javaassist's reflection method to get the parameter name of the method

18. MethodInfo MethodInfo = Cm.getmethodinfo ();

20. CodeAttribute CodeAttribute = Methodinfo.getcodeattribute ();

22. Localvariableattribute attr = (localvariableattribute) codeattribute.getattribute (Localvariableattribute.tag);

24. if (attr = = null) {

26. //Exception

28. }

30. string[] Paramnames = new string[cm.getparametertypes (). length];

32. int pos = modifier.isstatic (Cm.getmodifiers ())? 0 : 1;

34. for (int i = 0; i < paramnames.length; i++)

36. Paramnames[i] = attr.variablename (i + POS);

38. //Paramnames is the name of the parameter

40. for (int i = 0; i < paramnames.length; i++) {

42. System.out.println (Paramnames[i]);

44. }

48. } catch (Notfoundexception e) {

50. E.printstacktrace ();

52. }

54. }

Public static void main (String[] args)  {Class clazz =  Testjavaassist.class;try {classpool pool = classpool.getdefault (); Ctclass cc = pool.get (Clazz.getname ()); Ctmethod cm = cc.getdeclaredmethod ("concatstring");//  gets the parameter name of the method using the Javaassist reflection method MethodInfo  methodinfo = cm.getmethodinfo (); Codeattribute codeattribute = methodinfo.getcodeattribute (); localvariableattribute attr =  (Localvariableattribute)  codeattribute.getattribute ( Localvariableattribute.tag);if  (attr == null)  {// exception}string[] paramnames  = new string[cm.getparametertypes (). Length];int pos = modifier.isstatic ( Cm.getmodifiers ())  ? 0 : 1;for  (int i = 0; i <  paramnames.length; i++) Paramnames[i] = attr.variablename (i + pos);//  Paramnames is the parameter name for  (int i = 0; i < paramnames.length; i++)  {System.out.println ( Paramnames[i]);}}  catch  (notfoundexception e)  {e.printstacktrace ();}}

Javassist: Enhanced Java Reflection tool to get method parameter names