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();
         }
     }