pollservlet.java

该项目为网上书店

package org.myrose.servlet;

import java.io.IOException;
import java.util.List;

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

import org.myrose.beans.Poll;
import org.myrose.dao.PollDAO;

public class PollServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public PollServlet() {
		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
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html;charset=GBK");
		request.setCharacterEncoding("GBK");
	//	String result = request.getParameter("result");

		PollDAO dao = new PollDAO();

		int count = 0;
		List list = null;

		try {
			count = dao.getPollCount().intValue();
			list = dao.findPolls();
		} catch (Exception e) {
			e.printStackTrace();
		}
		request.setAttribute("count", count + "");
		request.setAttribute("list", list);
		request.getRequestDispatcher("poll_result.jsp").forward(request,
				response);

	}

	/**
	 * The doPost method of the servlet. <br>
	 * 
	 * This method is called when a form has its tag value method equals to
	 * post.
	 * 
	 * @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
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html;charset=GBK");
		request.setCharacterEncoding("GBK");

		String option = request.getParameter("optionname");

		HttpSession session = request.getSession();
		if (session.getAttribute("poll") == null) {
			if (option != null && !option.equals("")) {
				PollDAO dao = new PollDAO();
				Poll poll = new Poll();
				poll.setOptionName(option);
				try {
					int i = dao.updatePoll(poll);
					if (i != 0) {
						request.setAttribute("ispoll", "ok");
						session.setAttribute("poll", "ok");
						this.doGet(request, response);
						return;
					} else {
						request.setAttribute("ispoll", "no");
						request.getRequestDispatcher("index.aspx").forward(
								request, response);
						return;
					}
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		} else {
			request.setAttribute("ispoll", "has");
			this.doGet(request, response);
			return;
		}
	}

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

}