ZIP文件解压缩

	public void unZip(File file, String unzipFolder) throws IOException {

		byte b[] = new byte[2048];
		int length;

		ZipFile zipFile = new ZipFile(file, "MS932");
		@SuppressWarnings("rawtypes")
		Enumeration enumeration = zipFile.getEntries();
		ZipEntry zipEntry = null;
		OutputStream outputStream = null;
		InputStream inputStream = null;

		while (enumeration.hasMoreElements()) {
			zipEntry = (ZipEntry) enumeration.nextElement();
			File loadFile = new File(unzipFolder + zipEntry.getName());

			if (zipEntry.isDirectory()) {
				loadFile.mkdirs();
			} else {
				if (!loadFile.getParentFile().exists())
					loadFile.getParentFile().mkdirs();

				outputStream = new FileOutputStream(loadFile);
				inputStream = zipFile.getInputStream(zipEntry);

				/* 写入文件 */
				while ((length = inputStream.read(b)) > 0) {
					outputStream.write(b, 0, length);
				}
			}
		}
		outputStream.close();
		inputStream.close();
		zipFile.close();
	 }