定時器TimerTask:定時清理上傳文件

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.Timer;
import java.util.TimerTask;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.gmcc.kuchuan.MessageConstants;

/**
 * 定時清理上傳文件(超過7天)
 * 
 * @author Join
 * 
 */
public class DelUploadFileTimerTask {
	private Log logger = LogFactory.getLog(DelUploadFileTimerTask.class);
	private Timer timer;
	private final static long SEVER_DAY = 7 * 1000 * 60 * 60 * 24;//7天轉換成毫秒
	private final static String BACK_FILE_ROOT = "/data/www_back";// 服務器存儲備份文件根目錄
	
	public DelUploadFileTimerTask() {
		timer = new Timer();
		timer.schedule(new RemindTask(), 0, // initial delay
				SEVER_DAY); // subsequent rate 7天1次
		logger.debug("DelUploadFileTimerTask is Started");
	}

	class RemindTask extends TimerTask {

		public void run() {
			delUploadFile();
			// System.exit(0);
		}
	}

	/**
	 * 清理上傳文件(7天)
	 */
	public void delUploadFile() {
		ListDirectoryAndDelUploadFile(MessageConstants.FILE_ROOT);
	}
	/**
	 * 遍歷目錄文件和刪除超過時間的上傳文件(移動到備份目錄)
	 * @param path 根目錄
	 */
	public void ListDirectoryAndDelUploadFile(String path) {
		File file = new File(path);
		File[] files = file.listFiles();
		for (File fl : files) {
			if (fl.isDirectory()) {
				ListDirectoryAndDelUploadFile(fl.toString());
			} else {
				// 刪除超過7天的文件
				if (fl.lastModified() + SEVER_DAY < System.currentTimeMillis()) {
					moveFile(fl.getAbsolutePath(), BACK_FILE_ROOT + File.separator +fl.getName());
				}
			}
		}
	}

	/**
	 * 刪除文件
	 * 
	 * @param filePathAndName
	 */
	public void delFile(String filePathAndName) {
		try {
			String filePath = filePathAndName;
			filePath = filePath.toString();
			File myDelFile = new File(filePath);
			myDelFile.delete();

		} catch (Exception e) {
			logger.error("DelUploadFileTimerTask. Cleaning upload files. Delete file error." ,e);
			e.printStackTrace();

		}

	}

	/**
	 * 複製文件
	 * 
	 * @param oldPath
	 * @param newPath
	 */
	public void copyFile(String oldPath, String newPath) {
		try {
			int bytesum = 0;
			int byteread = 0;
			File oldfile = new File(oldPath);
			if (oldfile.exists()) { // 文件存在時
			// 讀入原文件
				InputStream inStream = new FileInputStream(oldPath);
				FileOutputStream fs = new FileOutputStream(newPath);
				byte[] buffer = new byte[1444];
				while ((byteread = inStream.read(buffer)) != -1) {
					bytesum += byteread; // 字節數 文件大小
//					System.out.println(bytesum);
					fs.write(buffer, 0, byteread);
				}
				inStream.close();
			}
		} catch (Exception e) {
			logger.error("DelUploadFileTimerTask. Cleaning upload files. Copy file error." ,e);
			e.printStackTrace();

		}

	}

	/**
	 * 移動文件到指定路徑
	 * 
	 * @param oldPath
	 * @param newPath
	 */
	public void moveFile(String oldPath, String newPath) {
		copyFile(oldPath, newPath);
		delFile(oldPath);
	}

	public static void main(String[] args) {
		new DelUploadFileTimerTask();
	}
}

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