JAVA线程定时器(web)

在J2EE中,web应用总有定时更新数据或者缓存的时候,除了spring中用的quartz 外还有线程方式,可能很少被关注.

package com.dtserver.client.listener;

import java.util.Timer;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
/**
DTServer各种线程与定时任务的启动
 */
public class ServerSocketListener implements ServletContextListener {
	
	//定时
	private Timer timer;
	

	//在服务器启动时，启动服务器线程。
		
		try {
			interval = Integer.valueOf(XmlUtil.getScanDtDataInterval()) * 60000;//三分钟一次
			//interval = 30000;
		} catch (Exception exception) {
			interval = 3 * 60000;
		}
		timer.schedule(new SendData(), 0, interval);
		
		
	}

}

被调用的类

package com.dtserver.client.logic;

import java.io.IOException;
import java.util.Date;
import java.util.List;
import java.util.Properties;
import java.util.TimerTask;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class SendData extends TimerTask {

	private static final Log log = LogFactory.getLog(SendData.class);

	private static final String ASURA_FILE_NAME = "/config/webservice_url.properties";

	private final static Properties props;

	static {
		props = new Properties();
		try {
			props.load(WebFrameAction.class
					.getResourceAsStream(XXX));
		} catch (IOException e) {
			throw new RuntimeException("can't load systemconfig.properties", e);
		}
	}

	@SuppressWarnings("unchecked")
	@Override
	public void run() {
		
				log.info("开始上传的时间" + new Date());

				
	}


}

web.xml

要想在web项目中启动必须在这里配入口.

	<!--服务器启动时，启动服务器线程-->
    <listener>
        <description>Socket服务器线程随服务器启动而启动</description>
        <listener-class>com.dtserver.client.listener.ServerSocketListener</listener-class>
    </listener>
    

看效果去

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