修改jar包里面的class的包名

参考文章
http://blog.csdn.net/hexin373/article/details/6669813

工具
http://www.ej-technologies.com/products/jclasslib/overview.html

修改class文件的代码

package com.kaka.modify;

import java.io.DataInput;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;

import org.gjt.jclasslib.io.ClassFileWriter;
import org.gjt.jclasslib.structures.CPInfo;
import org.gjt.jclasslib.structures.ClassFile;
import org.gjt.jclasslib.structures.InvalidByteCodeException;
import org.gjt.jclasslib.structures.constants.ConstantUtf8Info;

public class Test {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		ArrayList<String>  list = refreshFileList
			("E:\\javaDev\\反编译工程\\miidicredit_android_2_1_5\\net\\miidi\\credit\\view\\a");
		for (int i = 0; i < list.size(); i++) {
			modify(list.get(i));
		}
            
	}
	
	private static void modify(String filePath){
		FileInputStream fis;
		try {
			fis = new FileInputStream(filePath);
	        DataInput di = new DataInputStream(fis);     
	        ClassFile cf = new ClassFile();     
	        cf.read(di);     
	        CPInfo[] infos = cf.getConstantPool();     
	             
	        int count = infos.length;     
	        for (int i = 0; i < count; i++) {     
	            if (infos[i] != null) {     
	                System.out.print(i);     
	                System.out.print("|");     
	                // 名
	                String str = infos[i].getVerbose();
	                System.out.print(str);     
	                System.out.print("|");
	                // 类型
	                System.out.println(infos[i].getTagVerbose());     
	                if(str!=null && str.length()>0){    
	                	if(infos[i] instanceof ConstantUtf8Info){
		                	ConstantUtf8Info uInfo = (ConstantUtf8Info)infos[i]; 
		                    if(str.contains("/miidi/")){
			                    String str1 = str.replaceAll("/miidi/","/angela/");
			                    uInfo.setString(str1);    
			                    infos[i]=uInfo; 
		                    }
	                	}
	                }     
	            }     
	        }     
	        cf.setConstantPool(infos);     
	        fis.close();     
	        File f = new File(filePath);     
	        ClassFileWriter.writeToFile(f, cf);  
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (InvalidByteCodeException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} 
	}

	private static ArrayList<String> refreshFileList(String strPath) { 
		ArrayList<String> filelist = new ArrayList<String>(); 
        File dir = new File(strPath); 
        File[] files = dir.listFiles(); 
        if (files == null) 
            return null; 
        for (int i = 0; i < files.length; i++) { 
            if (files[i].isDirectory()) { 
                refreshFileList(files[i].getAbsolutePath()); 
            } else { 
                String strFileName = files[i].getAbsolutePath();//.toLowerCase();
                System.out.println("---"+strFileName);
                filelist.add(files[i].getAbsolutePath());              
            } 
        } 
        return filelist;
    }
}