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代码如下，已经测试：

private static void unzipFile(final String dir, final File zf)    {        File file = null;        try        {            ZipFile zipFile = new ZipFile(zf.toString());            Enumeration
    entries = zipFile.entries();            while (entries.hasMoreElements())            {                ZipEntry entry = (ZipEntry)entries.nextElement();                                String filename = entry.getName();                //目录，产生后返回。                if (entry.isDirectory())                {                    file = new File(dir + File.separator +filename);                    file.mkdirs();                    continue;                }                //确实有这种情况。                else if (filename.indexOf('/') >= 0)                {                    String subdir = filename.substring(0, filename.lastIndexOf('/'));                    file = new File(dir + File.separator +subdir);                    file.mkdirs();                }                file = new File(dir + File.separator +filename);                file.createNewFile();                                InputStream      is  = zipFile.getInputStream(entry);                FileOutputStream fos = new FileOutputStream(file);                int count = 0;                byte buf[] = new byte[4096];                while ((count = is.read(buf)) > 0)                {                     fos.write(buf, 0, count);                }                fos.close();                is.close();            }            zipFile.close();        }        catch (Exception e)        {            System.out.println(dir+", "+zf+", "+file);            e.printStackTrace();        }    }

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