java 字节流文件复制方法总结

1、使用字节流每次读写单个字节

public static void main(String[] args) throws IOException {
        FileInputStream fis = new FileInputStream("C:\CloudMusic\1.mp3");
        FileOutputStream fos = new FileOutputStream("e:\1.mp3");
        int len = 0;
        while ((len = fis.read()) != -1) {
            fos.write(len);
        }
        if (fos != null) {
            fos.close();
        }
        if (fis != null) {
            fis.close();
        }
    }

2、使用字节流每次读写多个字节

public static void main(String[] args) throws IOException {
        FileInputStream fis = new FileInputStream("C:\CloudMusic\1.mp3");
        FileOutputStream fos = new FileOutputStream("e:\1.mp3");
        byte[] b = new byte[1024];
        int len = 0;
        while ((len = fis.read(b)) != -1) {
            fos.write(b,0,len);
        }
        if (fos != null) {
            fos.close();
        }
        if (fis != null) {
            fis.close();
        }
    }

3、使用字节缓冲流每次读写单个字节

public static void main(String[] args) throws IOException {
        BufferedInputStream bis = new BufferedInputStream(new FileInputStream("C:\CloudMusic\1.mp3"));
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("e:\1.mp3"));
        int len = 0;
        while ((len = bis.read()) != -1) {
            bos.write(len);
        }
        if (bos != null) {
            bos.close();
        }
        if (bis != null) {
            bis.close();
        }
    }

4、使用字节缓冲流每次读写多个字节

public static void main(String[] args) throws IOException {
        BufferedInputStream bis = new BufferedInputStream(new FileInputStream("C:\CloudMusic\1.mp3"));
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("e:\1.mp3"));
        byte[] b = new byte[1024];
        int len = 0;
        while ((len = bis.read(b)) != -1) {
            bos.write(b, 0, len);
        }
        if (bos != null) {
            bos.close();
        }
        if (bis != null) {
            bis.close();
        }
    }