给定如下Servlet代码,假定在浏览器中输入URL:http://localhost:8080/servlet/HelloServlet,可以调用这个servlet,那么这个Servlet的输出是()。 import java.io.*; import javax.servlet.*; import javax.servlet.http.*; public class HelloServlet extends HttpServlet{ public void service(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException{} public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { res.setContentType("text/html"); PrintWriter out = res.getWriter(); out.println(""); out.println(""); out.println("doGet Hello World!"); out.println(""); out.println(""); out.close(); } public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { res.setContentType("text/html"); PrintWriter out = res.getWriter(); out.println(""); out.println(""); out.println("doPost Hello World!"); out.println(""); }}