Java IO 读写 String 的几种方法

最新推荐文章于 2024-03-06 08:56:54 发布

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本文通过示例介绍如何使用Java进行String的文件读写操作，包括使用BufferedWriter、DataOutputStream及FileChannel等方式写入，并展示了如何读取这些数据。

因为使用 IO 读写 String 在开发中不是经常使用，总是忘记，所以在此记录一下。

			String dateString = "2012-1-2";

			File file = new File("D:/test");
			FileOutputStream fileOutputStream = new FileOutputStream(file);

			// write1
			BufferedWriter bufferedWriter = new BufferedWriter(
					new OutputStreamWriter(fileOutputStream));
			bufferedWriter.write(dateString);
			bufferedWriter.close();

			// write2
			DataOutputStream dataOutputStream = new DataOutputStream(
					fileOutputStream);
			dataOutputStream.write(dateString.getBytes());

			// write3
			FileChannel writeFileChannel = fileOutputStream.getChannel();
			ByteBuffer writeByteBuffer = ByteBuffer.allocate(dateString
					.length());
			writeByteBuffer.put(dateString.getBytes());
			writeByteBuffer.flip();
			writeFileChannel.write(writeByteBuffer);

			fileOutputStream.close();

			FileInputStream fileInputStream = new FileInputStream(file);

			// read1
			BufferedReader bufferedReader = new BufferedReader(
					new InputStreamReader(fileInputStream));
			System.out.println(bufferedReader.readLine());

			// read2
			FileChannel readFileChannel = fileInputStream.getChannel();
			ByteBuffer readByteBuffer = ByteBuffer.allocate(1024);
			while (readFileChannel.read(readByteBuffer) != -1) {
				System.out.print(((ByteBuffer) (readByteBuffer.flip()))
						.asCharBuffer().get(0));
				readByteBuffer.clear();
			}

			fileInputStream.close();