如何通过JAVA NIO通道传输拷贝文件

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通过JAVA NIO 通道传输拷贝文件

方式一

 /**   * 通过JAVA NIO 通道传输拷贝文件   *   * @param sourcePath 源文件路径   * @param targetPath 目标文件路径   */  public static void copyFileByChannelTransfer(String sourcePath, String targetPath) {    FileChannel inChannel = null;    FileChannel outChannel = null;    try {      //获取通道      inChannel = FileChannel.open(Paths.get(sourcePath), StandardOpenOption.READ);      outChannel = FileChannel.open(Paths.get(targetPath),StandardOpenOption.WRITE,StandardOpenOption.READ,StandardOpenOption.CREATE);      inChannel.transferTo(0,inChannel.size(),outChannel);    } catch (IOException e) {      e.printStackTrace();    }finally {      //关闭流      try {        if (outChannel != null) {          outChannel.close();        }        if (inChannel != null) {          inChannel.close();        }      } catch (IOException e) {        e.printStackTrace();      }    }  }

方式二

 /**   * 通过JAVA NIO 通道传输拷贝文件   *   * @param sourcePath 源文件路径   * @param targetPath 目标文件路径   */  public static void copyFileByChannelTransfer2(String sourcePath, String targetPath) {    FileInputStream fis = null;    FileOutputStream fos = null;    FileChannel inChannel = null;    FileChannel outChannel = null;    try {      fis = new FileInputStream(sourcePath);      fos = new FileOutputStream(targetPath);      //获取通道      inChannel = fis.getChannel();      outChannel = fos.getChannel();      inChannel.transferTo(0,inChannel.size(),outChannel);    } catch (IOException e) {      e.printStackTrace();    }finally {      //关闭流      try {        if (outChannel != null) {          outChannel.close();        }        if (inChannel != null) {          inChannel.close();        }      } catch (IOException e) {        e.printStackTrace();      }    }  }

使用示例

String source = "e:\\demo\\纵天神帝.txt";    String target = "e:\\demo\\";    long time1 = System.currentTimeMillis();    copyFileByStream(source, target + "1.txt");    System.out.println("通过字节流实现文件的拷贝耗时：" + (System.currentTimeMillis() - time1));    long time2 = System.currentTimeMillis();    copyFileByReaderAndWriter(source, target + "2.txt");    System.out.println("通过字符流实现文件的拷贝耗时：" + (System.currentTimeMillis() - time2));    long time3 = System.currentTimeMillis();    copyFileByBuffered(source, target + "3.txt");    System.out.println("通过字节缓冲流实现文件的拷贝耗时：" + (System.currentTimeMillis() - time3));    long time4 = System.currentTimeMillis();    copyFileByBufferedChar(source, target + "4.txt");    System.out.println("通过字符缓冲流实现文件的拷贝耗时：" + (System.currentTimeMillis() - time4));    long time5 = System.currentTimeMillis();    copyFileByChannel(source, target + "5.txt");    System.out.println("通过JAVA NIO通道（非直接缓冲区）实现文件的拷贝耗时：" + (System.currentTimeMillis() - time5));    long time6 = System.currentTimeMillis();    copyFileByChannelBufferd(source, target + "6.txt");    System.out.println("通过JAVA NIO通道（直接缓冲区）实现文件的拷贝耗时：" + (System.currentTimeMillis() - time6));    long time7 = System.currentTimeMillis();    copyFileByChannelTransfer(source, target + "7.txt");    System.out.println("通过JAVA NIO通道传输实现文件的拷贝耗时：" + (System.currentTimeMillis() - time7));    long time8 = System.currentTimeMillis();    copyFileByChannelTransfer(source, target + "8.txt");    System.out.println("通过JAVA NIO通道传输2实现文件的拷贝耗时：" + (System.currentTimeMillis() - time8));

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