android zip解壓縮（含有子目錄)

note: 若是目錄中含有中文名稱， 要用substr = new String(substr.getBytes("8859_1"), "GB2312");這樣的語句轉換， 不然爲亂碼 

/**
        * 解壓縮功能.
        * 將ZIP_FILENAME文件解壓到ZIP_DIR目錄下.
        * @throws Exception
        */
        public int upZipFile(File zipFile, String folderPath)throws ZipException,IOException {
        //public static void upZipFile() throws Exception{
                ZipFile zfile=new ZipFile(zipFile);
                Enumeration zList=zfile.entries();
                ZipEntry ze=null;
                byte[] buf=new byte[1024];
                while(zList.hasMoreElements()){
                        ze=(ZipEntry)zList.nextElement();
                        if(ze.isDirectory()){
                                Log.d("upZipFile", "ze.getName() = "+ze.getName());
                                String dirstr = folderPath + ze.getName();
                                //dirstr.trim();
                                dirstr = new String(dirstr.getBytes("8859_1"), "GB2312");
                                Log.d("upZipFile", "str = "+dirstr);
                    File f=new File(dirstr);
                    f.mkdir();
                                continue;
                        }
                        Log.d("upZipFile", "ze.getName() = "+ze.getName());
                        OutputStream os=new BufferedOutputStream(new FileOutputStream(getRealFileName(folderPath, ze.getName())));
                        InputStream is=new BufferedInputStream(zfile.getInputStream(ze));
                        int readLen=0;
                        while ((readLen=is.read(buf, 0, 1024))!=-1) {
                                os.write(buf, 0, readLen);
                        }
                        is.close();
                        os.close();
                }
                zfile.close();
                return 0;
        }

   /**
        * 給定根目錄，返回一個相對路徑所對應的實際文件名.
        * @param baseDir 指定根目錄
        * @param absFileName 相對路徑名，來自於ZipEntry中的name
        * @return java.io.File 實際的文件
        */
        public static File getRealFileName(String baseDir, String absFileName){
                String[] dirs=absFileName.split("/");
                File ret=new File(baseDir);
                String substr = null;
                if(dirs.length>1){
                        for (int i = 0; i < dirs.length-1;i++) {
                                substr = dirs[i];
                                try {
                                        //substr.trim();
                                        substr = new String(substr.getBytes("8859_1"), "GB2312");

                                } catch (UnsupportedEncodingException e) {
                                        // TODO Auto-generated catch block
                                        e.printStackTrace();
                                }
                                ret=new File(ret, substr);

                        }
                        Log.d("upZipFile", "1ret = "+ret);
                        if(!ret.exists())
                                ret.mkdirs();
                        substr = dirs[dirs.length-1];
                        try {
                                //substr.trim();
                                substr = new String(substr.getBytes("8859_1"), "GB2312");
                                Log.d("upZipFile", "substr = "+substr);
                        } catch (UnsupportedEncodingException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                        }

                        ret=new File(ret, substr);
                        Log.d("upZipFile", "2ret = "+ret);
                        return ret;
                }

             return ret;
        }