文件大小:1.46 GB (1,568,946,426 字节)

• 使用transferTo零拷贝，代码如下，耗时12116ms

      public static void main(String[] args) throws IOException {
          long start=System.currentTimeMillis();
          FileChannel inputChannel=new FileInputStream(new File("E:\\video\\第1阶段.zip")).getChannel();
          FileChannel outChannel=new FileOutputStream(new File("E:\\video\\第1阶段1.zip")).getChannel();
          inputChannel.transferTo(0,inputChannel.size(),outChannel);
          System.out.println(System.currentTimeMillis()-start);
      }

• 使用阻塞io,代码如下,耗时19464ms,代码如下:

      public static void main(String[] args) throws IOException {
          long start=System.currentTimeMillis();
          FileInputStream inputstream=new FileInputStream(new File("E:\\video\\第1阶段.zip"));
          FileOutputStream  outStream=new FileOutputStream(new File("E:\\video\\第1阶段1.zip"));
          int bytesWritten = 0;
          int byteCount = 0;
          byte[] bytes = new byte[1024];
          while ((byteCount = inputstream.read(bytes)) != -1)
          {
              outStream.write(bytes,0, byteCount);
          }
          inputstream.close();
          outStream.close();
          System.out.println(System.currentTimeMillis()-start);
      }

  性能提升:37.75%