关于java:commonsio下的几个copy-api

1. copyFile

   • copy file and rename file
   • reserve the file’s last modified date/times(cp -p)
   • both src and dest should be file

FileUtils.copyFile(new File("./folderA/a.txt"),new File("./folderB"));

2. copyFileToDirectory

   • copy file to dest folder
   • dest must be folder, if not exist, mkdirs

FileUtils.copyFileToDirectory(new File("src/main/resources/folderA/a.txt"),new File("src/main/resources/folderB/"));

3. copyDirectory

   • copy all files in one folder to another folder
   • src must be folder, or throw exception
   • for dest folder, mkdirs

FileUtils.copyDirectory(new File("src/main/resources/folderA/"),new File("src/main/resources/folderB/c.txt"));

4. copyDirectoryToDirectory

   • copy to dest folder as a subfolder

FileUtils.copyDirectoryToDirectory(new File("src/main/resources/folderA/"),new File("src/main/resources/folderB/"));