How to get all imports defined in a class using ja

问题:

Hi i am new in java reflection domain.So can anyone guide me in this problem scenario.

I have a class named "SomClass.java" and it imports a package named "SomPackage.RefClass" And some other java libraries like java.lang.. etc.

Now i wish to get know all the imports defined in a class through reflection.

import SomPackage.RefClass;
import java.lang.reflect.Field;
import java.io.IOException; 
 public class SomeClass{
  RefClass refClass_Obj;
  String nationality;
///some other members
}

I just wanna know the list of all import defined in a class using reflection.

I have seen a Question posted hear similar to my Q but it is not well elaborated so,need some good direction of help.

thanks in advance.

回答1:

I just wanna know the list of all import defined in a class using reflection

You can't because the compiler doesn't put them into the object file. It throws them away. Import is just a shorthand to the compiler.

回答2:

Imports are a compile-time feature - there's no difference to the compiled code between a version which uses the full name of the type everywhere it's mentioned, a version which imports everything using a *, and a version which imports classes by full name.

If you want to find all the types used within the compiled code, that's a slightly different matter. You may want to look at BCEL as a way of analyzing bytecode.

回答3:

I think you can use Qdox to get all the imports in a class which is not actually through reflection, but it can server your purpose :

    String fileFullPath = "Your\\java\\ file \\full\\path";
    JavaDocBuilder builder = new JavaDocBuilder();
    builder.addSource(new FileReader( fileFullPath  ));

    JavaSource src = builder.getSources()[0];
    String[] imports = src.getImports();

    for ( String imp : imports )
    {
        System.out.println(imp);
    }