java文件压缩

	/**
	 * 
	 * @param fileName
	 *            压缩文件路径
	 * @param RARRealpath
	 *            压缩后的文件路径
	 * @throws Exception
	 */
	public static void RARFile(String fileName, String RARRealpath)
			throws Exception {

		if (fileName == null) {
			return;
		}
		fileName = fileName.trim();

		if (fileName.equals("")) {
			return;
		}
		// winRAR程序路径
		String RARCMD = "C://Program Files//WinRAR//Rar.exe a -ep";
		String exec = RARCMD + " " + RARRealpath + " " + fileName;
		Runtime rt = Runtime.getRuntime();
		Process p = rt.exec(exec);
		BufferedReader br = new BufferedReader(new InputStreamReader(p
				.getInputStream(), "gbk"));
		@SuppressWarnings("unused")
		String line;
		while ((line = br.readLine()) != null) {
			// System.out.println(line);
		}

		br = new BufferedReader(
				new InputStreamReader(p.getErrorStream(), "gbk"));
		while ((line = br.readLine()) != null) {
			// System.err.println(line);
		}
		// 当前线程等待该process结束，既挂起主线程
		p.waitFor();
	}