servlet启动服务的两种方式

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1、配置监听，实现ServletContextListener

web.xml:

<listener>      <display-name>startThreadHelloWorld</display-name>      <listener-class>com.relive.listener.HelloListener</listener-class>  </listener>

java代码：

public class HelloListener implements ServletContextListener {@Overridepublic void contextDestroyed(ServletContextEvent sce) {System.out.println("执行销毁方法...");}@Overridepublic void contextInitialized(ServletContextEvent sce) {System.out.println("启动监听，执行初始化方法...");}}

在contextInitialized(ServletContextEvent sce)方法中启动线程或任意其他服务。

2、配置servlet，继承GenericServlet类

web.xml:

 <servlet>  <servlet-name>helloServlet</servlet-name>  <servlet-class>com.relive.servlet.HelloServlet</servlet-class><load-on-startup>1</load-on-startup>  </servlet>  <servlet-mapping>  <servlet-name>helloServlet</servlet-name>  <url-pattern>/helloServlet/*</url-pattern>  </servlet-mapping>

java代码：

public class HelloServlet extends GenericServlet {private static final long serialVersionUID = -566043926299855050L;public void init(ServletConfig config) throws ServletException {System.out.println("执行servlet..init方法..");}public void service(ServletRequest sRequest, ServletResponse sResponse)throws ServletException, IOException {System.out.println("执行servlet..service方法..");}}

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