OpenLayers地图加入google图层

package com.kwt.lbs.google.controller; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; @SuppressWarnings("serial") public class PageController extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=utf-8"); String view=request.getParameter("view"); if(view.equals("index")){ request.getRequestDispatcher("/index.jsp").forward(request,response ); }else if(view.equals("helloworld")){ request.getRequestDispatcher("/WEB-INF/pages/helloworld.jsp").forward(request,response ); }else if(view.equals("googlelayer")){ request.getRequestDispatcher("/WEB-INF/pages/googlelayer.jsp").forward(request,response ); }else if(view.equals("history")){ request.getRequestDispatcher("/WEB-INF/pages/history.jsp").forward(request,response ); } } }