阅读下列程序,在空白处填写正确的代码,使程序能读取该servlet的配置信息,从中获得参数名为encoding对应的参数值,并输出到页面上。 import java.io.*; import javax.servlet.*; import javax.servlet.http.*; public class MyServlet extends HttpServlet { protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { PrintWriter out = response.getWriter(); ServletConfig config = __________; String param = config.getInitParameter("encoding"); out.println("encoding=" + param); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doGet(request, response); } }