文件和流的转换

文件转换InputStream

/**
	 * 文件转换InputStream
	 * 
	 * @param file
	 * @return
	 * @throws FileNotFoundException
	 */
	public InputStream getInputStream(File file) throws FileNotFoundException {

		return new FileInputStream(file);
	}

inputStream 转file

/**
	 * inputStream 转file
	 * 
	 * @param is
	 *            输入流
	 * @param file
	 *            输出的文件
	 * @throws IOException
	 */
	public void getFile(InputStream is, File file) throws IOException {

		OutputStream os = null;
		try {
			os = new FileOutputStream(file);
			int len = 0;
			byte[] buffer = new byte[8192];
			while ((len = is.read(buffer)) != -1) {
				os.write(buffer, 0, len);
			}
		} finally {
			is.close();
			os.close();
		}
	}