dbtimerefreshservlet.java

oa办公系统

package cn.jx.ecjtu.oa.servlets;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Timer;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import cn.jx.ecjtu.oa.services.RefreshTask;
import cn.jx.ecjtu.oa.services.TimeSaveTask;

public class DBTimeRefreshServlet extends HttpServlet {

	private Timer         db_timer=null;
    private TimeSaveTask  db_task =null;
	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		//销毁定时器
		if(null!=db_timer)
		    db_timer.cancel();
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
           this.doPost(request, response);
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occure
	 */
	public void init() throws ServletException {
		ServletContext context=this.getServletContext();
		
		// (true为用定时间刷新缓存)    
		String start_db_task= getInitParameter("start_task"); 

		
		// 定时刷新时间(分钟)    
 
		long db_delay = Long.parseLong(getInitParameter("delay")); 

	    // 启动定时器 在线列表数据库更新  
		if(start_db_task.equals("true")){    
		    db_timer = new Timer(true);    
		    db_task = new TimeSaveTask(context);    
		    db_timer.schedule(db_task, db_delay * 60 * 1000, db_delay * 60 * 1000);    
		}  
		
	}

}