/**
     * 解压指定zip文件。
     *
     * @param path          zip文件路径
     * @param unZipFileName 需要解压的zip文件名
     * @throws IOException 解压遇到的IOException
     */
    public static void unZip(String path, String unZipFileName) throws IOException {
        ZipFile zipFile = new ZipFile(appendPath(getSdCardPath(), path, unZipFileName),
                Constant.ENCODING_GBK);
        for (Enumeration entries = zipFile.getEntries(); entries.hasMoreElements(); ) {
            ZipEntry entry = (ZipEntry) entries.nextElement();
            File file = new File(appendPath(getSdCardPath(), path, entry.getName()));
            if (entry.isDirectory()) {//是目录，则创建之
                if (!file.exists()) {
            if (!file.mkdir()) {
                throw new IOException("目录创建失败");
            }
        }
            } else {//是文件
                //如果指定文件的父目录不存在,则创建之.
               File parentFile = file.getParentFile();                
               if (!parentFile.exists()) {
               if (!parentFile.mkdir()) {
                   throw new IOException("目录创建失败");
               }
               }
                byte[] buffer = new byte[Constant.BUFFER_SIZE];
                FileOutputStream fileOut = new FileOutputStream(file);
                InputStream inputStream = zipFile.getInputStream(entry);
                int readedBytes;
                while ((readedBytes = inputStream.read(buffer)) > 0) {
                    fileOut.write(buffer, 0, readedBytes);
                }
                fileOut.close();
                inputStream.close();
            }
        }
        zipFile.close();

    }