[JAVA]字节数组流

 

 

import java.io.*;

public class ByteArrayStream {
    public static void main(String[] args) {
        byte[] datas = fileToByteArray("D:/test/1111.mp4");
        byteArrayToFile(datas, "D:/test/byteArrayNew.mp4");
    }

    public static byte[] fileToByteArray(String filePath) {
        File src = new File(filePath);
        byte[] dest = null;
        ByteArrayOutputStream baos = null;
        InputStream is = null;
        try {
            is = new FileInputStream(src);
            baos = new ByteArrayOutputStream();
            byte[] buf = new byte[1024 * 10];
            int len = -1;
            while ((len = is.read(buf)) != -1) {
                baos.write(buf, 0, len);
            }
            baos.flush();

            return baos.toByteArray();

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (is != null) {
                try {
                    is.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

        return null;
    }

    public static void byteArrayToFile(byte[] src, String filePath) {
        File dest = new File(filePath);
        InputStream is = null;
        OutputStream os = null;
        try {
            is = new ByteArrayInputStream(src);
            os = new FileOutputStream(dest);
            byte[] buf = new byte[1024];
            int len = -1;
            while((len = is.read(buf))!=-1){
                os.write(buf,0,len);
            }
            os.flush();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        finally {
            if (os != null) {
                try {
                    os.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }
}