java读取文件

private static String readFile(String fileName) {
	String res = "";
	File f = new File(fileName);
	InputStreamReader isReader = null;
	BufferedReader buff = null;
	try {
		isReader = new InputStreamReader(new FileInputStream(f), "UTF-8");
		buff = new BufferedReader(isReader);
		String line;
		while ((line = buff.readLine()) != null) {
			res += line;
		}
	} catch (IOException e) {
		System.out.println("解析文件异常:" + e.getMessage());
	} finally {
		try {
			if (buff != null) {
				buff.close();
			}
			if (isReader != null) {
				isReader.close();
			}
		} catch (Exception e) {
		}
	}
	return res;
}