IO流之字节流的读取操作

最新推荐文章于 2025-05-29 12:38:48 发布

原创最新推荐文章于 2025-05-29 12:38:48 发布 · 327 阅读

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#IO字节流

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本文详细介绍了如何使用Java的字节流进行文件的读取、写入及拷贝操作，包括FileInputStream、FileOutputStream、BufferedInputStream和BufferedOutputStream的使用方法。

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    /**
     * 字节流读取文件
     */
    private void readByteStream() throws IOException {
		// 字节输入流
        FileInputStream fileInputStream = new FileInputStream(new File("D:\\aa.txt"));
		// 字节数组
        byte[] bytes = new byte[100];
		// 读取
        fileInputStream.read(bytes);
		// 关闭流
        fileInputStream.close();
    }

    /**
     * 字节流写入文件
     */
    private void writeByteStream() throws IOException {
		// 写入内容
        String content = "I like programming";
		// 字节输出流
        FileOutputStream fileOutputStream = new FileOutputStream(new File("D:\\dd.txt"));
		// 写入
        fileOutputStream.write(content.getBytes());
		// 关闭流
        fileOutputStream.close();

    }

    /**
     * 字节流读写文件--实现文件拷贝
     *
     * @throws IOException IO异常
     */
    private void writeFilesWithByteStream() throws IOException {
    	// 字节输入流
        FileInputStream fileInputStream = new FileInputStream(new File("D:\\aa.txt"));
        // 字节输出流
        FileOutputStream fileOutputStream = new FileOutputStream(new File("D:\\bb.txt"));

        byte[] bytes = new byte[1024];

        int len;

        while ((len = fileInputStream.read(bytes)) != -1) {
            fileOutputStream.write(bytes, 0, len);
        }
		// 关闭流
        fileOutputStream.close();
        fileInputStream.close();
    }

    /**
     * 缓冲字节流读写文件--实现文件拷贝
     *
     * @throws IOException IO异常
     */
    private void writeFilesWithBufferedByteStream() throws IOException {

        BufferedInputStream bufferedInputStream = new BufferedInputStream(new FileInputStream(new File("D:\\aa.txt")));
        BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(new FileOutputStream(new File("D:\\cc.txt")));

        byte[] bytes = new byte[1024];

        int len;

        while ((len = bufferedInputStream.read(bytes)) != -1) {
            bufferedOutputStream.write(bytes, 0, len);
        }
		// 关闭流
        bufferedOutputStream.close();
        bufferedInputStream.close();
    }