java缓冲读写

public static void main(String[] args) throws Exception {
		String directory = "D:\\workspace\\aaa\\src\\online\\test.txt";
		BufferedReader bufferedReader = new BufferedReader(
				new InputStreamReader(new BufferedInputStream(
						new FileInputStream(directory))));
		// use the readLine to read file of char.
		String data = null;
		while ((data = bufferedReader.readLine()) != null) {
			System.out.println(data);
		}


		BufferedWriter bufferWriter = new BufferedWriter(
				new OutputStreamWriter(new BufferedOutputStream(
						new FileOutputStream(directory))));
		String str = "hello world";
		bufferWriter.write(str, 0, str.length());

		bufferedReader.close();
		bufferWriter.close();
	}