How to copy files through byte stream in java

Copying files through byte streams

 /**
   * 通过字节流实现文件的拷贝
   * @param sourcePath 源文件路径
   * @param targetPath 目标文件路径
   */
  public static void copyFileByStream(String sourcePath,String targetPath){
    //源文件路径
    File source = new File(sourcePath);
    //目标文件路径
    File target = new File(targetPath);

    //如果源文件不存在则不能拷贝
    if(!source.exists()){
      return;
    }
    //如果目标文件目录不存在则创建
    if(!target.getParentFile().exists()){
      target.getParentFile().mkdirs();
    }

    try {
      //实现文件的拷贝
      InputStream inputStream = new FileInputStream(source);
      OutputStream outputStream = new FileOutputStream(target);
      int temp = 0;
      //每次读取1024个字节
      byte[] data = new byte[1024];
      //将每次读取的数据保存到字节数组里面，并且返回读取的个数
      while ((temp = inputStream.read(data)) != -1){
        //输出数组
        outputStream.write(data,0,temp);
      }

      inputStream.close();
      outputStream.close();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }

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