3种Servlet

No.1:

public class xxx implements Servlet {

           重写其中相应函数

           public void init(ServletConfig param1) throws ServletException {}  //只在创建servlet时执行一次

           public ServletConfig getServletConfig() {}

           public void service(ServletRequest req, ServletResponse res) {}

           public String getServletInfo() {}

           public void destroy() {}

}



No.2:

public class xxx extends HttpServlet {   //应用最为广泛

           //只需重写其中相应函数

           public void doGet(ServletRequest req, ServletResponse res) {}

           public void doPost(ServletRequest req, ServletResponse res) {}

}



No.3:

public class xxx extends GenericServlet {

           //重写其中相应函数

}