file operate

	
/**
	 * 获取随机名称（文件）
	 * 
	 * @param fileRealName
	 * @return Created：2010-7-30
	 * @author:WKF28474
	 */
	public static String getRandomName(String fileRealName) {
		String temp_time = new SimpleDateFormat("yyyyMMddHHmmss")
				.format(new Date());
		String randomName = null;
		String end_point = "";
		int point_int = fileRealName.lastIndexOf(".");
		if (point_int != -1) {
			end_point = fileRealName.substring(point_int + 1,
					fileRealName.length()).toLowerCase();
			randomName = temp_time + "." + end_point;
		} else {
			randomName = temp_time;
		}
		return randomName;
	}
	
	/**
	 * 上传附件
	 * 
	 * @param path_name  需要将文件上传到什么目录
	 * @param attachment 需要上传的文件
	 * @param maxSize    文件的最大长度是多少(bite) 如果为-1表示没有限制
	 * @return
	 * @throws ApplicationException
	 * Created：2010-7-6
	 * @author:WKF28474
	 */
	public static String saveFile(String path_name, FormFile attachment,
			int maxSize) throws Exception {
		try {
			if (attachment == null) {
				throw new Exception("file is null"); // /file is null
			}
			// 验证是否内容为空
			int attachment_size = attachment.getFileSize();
			if (attachment_size == 0) {
				throw new Exception("file's size is 0"); // file's size is 0
			}
			// 验证文件大小,如果maxSise=-1表示没有限制
			if (maxSize != -1 && attachment_size > maxSize) {
				throw new Exception("file is large"); // 文件大小限制
			}
			
			// 生成在服务器上的文件名（上传到服务器后的文件名是什么)
			String attachment_name = attachment.getFileName();
			// 获取文件名
			String file_name = Test.getRandomName(attachment_name);
			// 上传附件
			uploadFile(attachment.getInputStream(), path_name, file_name);

			// 返回生成的文件名即可
			return file_name;
		} catch (Exception e) {
			throw new Exception("file upload faild", e);
		}
	}

	
	/**
	 * 用流的方式上传文件 Notes:
	 * 
	 * @param attachment
	 * @param path_name
	 * @param file_name
	 * @throws ApplicationException
	 *             Created：2010-7-6
	 * @author:WKF28474
	 */
	public static void uploadFile(InputStream is, String path_name,
			String file_name) throws Exception {
		BufferedOutputStream outB = null;
		BufferedInputStream inB = null;
		// 生成目录和文件
		File file = doBefore(path_name, file_name);
		try {
			outB = new BufferedOutputStream(new FileOutputStream(file));
			inB = new BufferedInputStream(is);
			// 循环上传数据
			int count = 0;
			int size = 1024;
			byte[] b = new byte[size];
			count = inB.read(b, 0, size);
			if (count > 0) {
				outB.write(b, 0, count);
			}
			while ((count = inB.read(b, 0, size)) > 0) {
				outB.write(b, 0, count);
			}
		} catch (Exception e) {
			throw new Exception("", e);
		} finally {
			try {
				outB.close();
				inB.close();
			} catch (Exception e) {
				throw new Exception("", e);
			}
		}
	}

	/**
	 * 创建文件 Notes:
	 * 
	 * @param absolutePath
	 * @param sFileName
	 * @return
	 * @throws ApplicationException
	 *             Created：2010-7-6
	 * @author:WKF28474
	 * @throws Exception
	 */
	public static File doBefore(String path_name, String file_name)
			throws Exception {
		File file = null;
		if (!new File(path_name).isDirectory()) {
			if (!new File(path_name).mkdirs()) {
				throw new Exception("");
			}
		}
		// 创建目标文件
		try {
			String fullFileName = Test.replaceWithAny(Test.replaceWithAny(
					path_name, "\\", "/")
					+ "/" + file_name, "//", "/");
			file = new File(fullFileName);
			if (!file.exists()) {
				file.createNewFile();
			} else {
				throw new Exception("");
			}
		} catch (Exception e) {
			throw new Exception("", e);
		}
		return file;
	}
	
	/**
	 * 删除文件和子文件
	 * 
	 * @param dirFile
	 * @throws Exception
	 *             Created：2010-8-19
	 * @author:WKF28474
	 */
	public static void forceDelDir(File dirFile) throws Exception {
		if (dirFile.exists()) {
			try {
				File childFile[] = dirFile.listFiles();
				for (int i = 0; i < childFile.length; i++) {
					if (childFile[i].isDirectory()) {
						forceDelDir(childFile[i]);
					} else {
						childFile[i].delete();
					}
				}
				// 删除目录
				dirFile.delete();
			} catch (Exception ex) {
				ex.printStackTrace();
				throw ex;
			}
		}
	}

	/**
	 * 读取指定目录下的Properties配置文件.
	 * 
	 * @param resource
	 * @return Created：2011-1-5
	 * @author:zKF29923
	 */
	public static Properties getProperties(String resource) {
		Properties properties = new Properties();
		try {
			properties.load(getStream(resource));
		} catch (IOException e) {
			throw new RuntimeException("couldn't load properties file '"
					+ resource + "'", e);
		}
		return properties;
	}
	
	/**
	 * 读取指定目录下文件的输入流.
	 * 
	 * @param resource
	 * @return
	 * Created：2011-1-5
	 * @author:zKF29923
	 */
	public static InputStream getStream(String resource) {
		InputStream inputStream = Test.class.getClassLoader()
				.getResourceAsStream(resource);

		return inputStream;
	}

    public static String replaceWithAny(String sourceStr, String sFlag, String sReplace)
    throws Exception {
		StringBuffer sb = new StringBuffer();
		sourceStr = sourceStr.trim();
		for (int index = sourceStr.indexOf(sFlag); index != -1; index = sourceStr
				.indexOf(sFlag)) {
			sb.append(sourceStr.substring(0, index)).append(sReplace);
			sourceStr = sourceStr.substring(index + sFlag.length()).trim();
		}

		sb.append(sourceStr);
		return sb.toString();
	}