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Tomcat启动时，自动访问本地servlet

2024-11-16 06:05:39   203人阅读

通过监听器来实现 

1.自定义一个类 CallLocationServelt 实现  ServletContextListener 

并覆盖其  contextInitialized(ServletContextEventarg0)方法

public void contextInitialized(ServletContextEvent arg0) {
		// TODO Auto-generated method stub
		System.out.println("CallLocationServelt监听器启动了");
		//利用定时器来执行每3秒访问一次	
		Timer timer = new Timer();
		timer.schedule(new TimerTask()
		{
			 public void run()
			{
				//初始化http请求客户端
				HttpClient httpClient =new DefaultHttpClient();
				//使用get方法进行请求
				HttpGet httpGet = new HttpGet("http://localhost:8080/CallLocationServelt/servlet/LocalServlet");
				try {
					//执行请求，并将结果存入Http响应对象中
						HttpResponse  response = httpClient.execute(httpGet);
					} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
					
					} 	
			}
		}, 0, 3*1000);

2. 在web.xml配置该监听器，让其在 tomcat 启动时便执行

  <listener>
      <listener-class>  
    	CallLocationServelt
    </listener-class> 
  </listener>

 3. 编写一个简单的servlet ，供监听器来访问

public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		System.out.println("访问LocalServlet次数:"+(calltime++));
	}


完整的项目可以下载： http://download.csdn.net/detail/ch717828/8394573


参考文献：http://blog.csdn.net/cai5/article/details/7528888

http://download.csdn.net/detail/aaayongaaa/5300578

http://download.csdn.net/detail/linzhijia0612/4965858


Tomcat启动时，自动访问本地servlet


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