创建并初始化一个servlet

public class HelloServlet extends HttpServlet {@Overridepublic void init(ServletConfig config) throws ServletException {super.init(config);}protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {PrintWriter out=response.getWriter();out.print("Hello World");}@Overridepublic void destroy() {super.destroy();}}