showvoteservlet.java

用jsp编写的网上投票系统

package votebean;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @author xiaoq
 *
 */
public class ShowVoteServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public ShowVoteServlet() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	/* (non-Javadoc)
	 * @see javax.servlet.http.HttpServlet#doGet(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		response.setHeader("Pragma", "No-cache");
		response.setHeader("Cache-control", "no-cache");
		response.setDateHeader("Expires", 0);
		response.setContentType("text/html;charset=GBK");
		String id=request.getParameter("id");
		String page=request.getParameter("page");
		VoteMgr mgr=new VoteMgr();
		Questions question=mgr.getVote(Integer.parseInt(id));
		request.setAttribute("question", question);
		try{
			request.getRequestDispatcher(page).forward(request, response);
		}catch(Throwable t){
			getServletContext().log(t.getMessage());
		}
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}