private void startCopy(File src,File dest) {
			
			try {
				if (!dest.exists()) {
					FileUtil.copyFile(src, dest);
				} else {
					if (src.lastModified() > dest
							.lastModified()) {
						FileUtil.copyFile(src, dest);
					}
				}
			} catch (Exception e) {
				if (e instanceof FileNotExistException) {
					
				}else if(e instanceof CopyFileErrorException) {
					if (toFile.getFreeSpace() < fileInfo.getTotalFileSize()) {
						
					}
				}
			}
			
		}