java中文件拷贝

最新推荐文章于 2024-11-12 18:35:04 发布

原创最新推荐文章于 2024-11-12 18:35:04 发布 · 545 阅读

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本文介绍了一段Java代码实现文件从旧路径到新路径的拷贝过程，包括使用UUID生成唯一文件名及按年月日组织文件路径的方法。

String uuidDoc = UUID.randomUUID().toString();
Calendar date = Calendar.getInstance();
int year = date.get(Calendar.YEAR);
int month = date.get(Calendar.MONTH) + 1;
int day = date.get(Calendar.DAY_OF_MONTH);
String afterPath = year + "\\" + month + "\\" + day + "\\" + uuidDoc + ".doc";
String newPath = impl.getDirPaths() + afterPath; //新文件

//拷贝文件
int length=2097152;
File f1 = new File(oldPath);
File f2 = new File(newPath);
int bytesum = 0;
int byteread = 0;
if(f2.createNewFile()){
  FileInputStream inStream = new FileInputStream(f1);
  FileOutputStream outStream = new FileOutputStream(f2);
  byte[] buffer=new byte[length];
  while((byteread = inStream.read(buffer)) != -1){
     bytesum += byteread; //字节数文件大小
     outStream.write(buffer, 0, byteread);
  }
  inStream.close();
}