java定时器处理超时未支付订单

1、核心代码

public class MyTimerTask implements ServletContextListener {

	private Timer timer = null;

	// 初始化监听器，创建实例，执行任务

	public void contextInitialized(ServletContextEvent event) {
		timer = new Timer();
		Timer timer = new Timer();
		timer.schedule(new TimerTask() {
			public void run() {
				Connection conn = null;
				ResultSet rs = null;
				PreparedStatement st = null;
				try {
					conn = DbUtil.getConnection();
					conn.setAutoCommit(false);
					java.util.Date date = new Date();
					System.out.println("开始查询超时未支付订单...");
					rs = DbUtil.getResultSet(conn,
							"select id, last_payment from mat_info where pay_status=0 and last_payment <'"+ date + "'");
					while (rs.next()) {
						System.out.println("timeout order id is"+ rs.getString("id"));
						st = conn.prepareStatement("update mat_info set room_id ='' where pay_status=0 and id='"+ rs.getString("id") + "'");
						st.execute();
					}
					conn.commit();
				} catch (Exception e) {
					System.out.println(e);
					try {
						conn.rollback();
					} catch (SQLException e1) {
						// TODO Auto-generated catch block
						e1.printStackTrace();
					}
					e.printStackTrace();
				} finally {
					DbUtil.closeResultSet(rs);
					DbUtil.closeConnection(conn);
				}
			}
		}, 1000, 15000);
	}

	// 销毁监听器，停止执行任务

	public void contextDestroyed(ServletContextEvent event) {
		// 确保正在执行的任务是此计时器所执行的最后一个任务。
		timer.cancel();
	}

}

2、配置

在web.xml里面添加如下配置

     
               
	       com.lcychina.utils.MyTimerTask