/**     * 解压缩一个文件     *      * @param zipFile     *            要解压的压缩文件     * @param folderPath     *            解压缩的目标目录     * @param folderName     *            解压缩的文件夹名称     * @throws IOException     *             当解压缩过程出错时抛出     */    public static void upZipFile(File zipFile, String folderPath,            String folderName) throws ZipException, IOException {        File desDir = new File(folderPath);        if (!desDir.exists()) {            desDir.mkdirs();        }        ZipFile zf = new ZipFile(zipFile);        String fileName = "";        for (Enumeration
      entries = zf.entries(); entries.hasMoreElements();) {            ZipEntry entry = ((ZipEntry) entries.nextElement());            InputStream in = zf.getInputStream(entry);            fileName = entry.getName().substring(                    entry.getName().indexOf('/') + 1);            String str = folderPath + File.separator + folderName + "/"                    + fileName;            str = new String(str.getBytes("8859_1"), "GB2312");            File desFile = new File(str);            if (!desFile.exists()) {                File fileParentDir = desFile.getParentFile();                if (!fileParentDir.exists()) {                    fileParentDir.mkdirs();                }                desFile.createNewFile();            }            OutputStream out = new FileOutputStream(desFile);            byte buffer[] = new byte[1024];            int realLength;            while ((realLength = in.read(buffer)) > 0) {                out.write(buffer, 0, realLength);            }            in.close();            out.close();        }    }