I/O流之缓冲流的文件复制代码及节点流处理数据加密

缓冲流的文件复制代码

@Test
public void bufferedStream() {
    long start = System.currentTimeMillis();
    BufferedInputStream bufferedInputStream = null;
    BufferedOutputStream bufferedOutputStream = null;
    try {
        File file = new File("D:\\视频\\1.mp4");
        File file2 = new File("D:\\视频\\2.mp4");

        FileInputStream fileInputStream = new FileInputStream(file);
        FileOutputStream fileOutputStream = new FileOutputStream(file2);

        bufferedInputStream = new BufferedInputStream(fileInputStream);
        bufferedOutputStream = new BufferedOutputStream(fileOutputStream);

        byte[] bytes = new byte[1024];
        int len;
        while ((len = bufferedInputStream.read(bytes)) != -1){
            bufferedOutputStream.write(bytes, 0, len);
        }
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if(bufferedInputStream != null){
            try {
                bufferedInputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        if(bufferedOutputStream != null){
            try {
                bufferedOutputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    long end = System.currentTimeMillis();
    System.out.println(end - start);
}

节点流的处理数据加密代码

@Test
    public void testFileReaderFileWriter() throws IOException {
        File inputFile = new File("4.jpg");
        File outputFile = new File("5.jpg");

        FileInputStream fileInputStream = new FileInputStream(inputFile);
        FileOutputStream fileOutputStream = new FileOutputStream(outputFile,true);

        int data = 0;
        while((data = fileInputStream.read()) != -1){
            fileOutputStream.write(data ^ 5);
        }

        fileInputStream.close();
        fileOutputStream.close();
    }