browsevoteservlet.java

用jsp编写的网上投票系统

package votebean;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.*;

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

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

	/**
	 * Constructor of the object.
	 */
	public BrowseVoteServlet() {
		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");
		int pagesize=10;
		String page=request.getParameter("page");
		VoteMgr mgr=new VoteMgr();
		int count=mgr.getCount();
		int totalPageNum=count/pagesize;
		if((count%pagesize)>0){
			totalPageNum+=1;
		}
		Collection c=null;
		if(page==null){
			c=mgr.getAllMessage(pagesize,1);
		}else{
			c=mgr.getAllMessage(pagesize, Integer.parseInt(page));
		}
		request.setAttribute("totalPageNum", new Integer(totalPageNum));
		request.setAttribute("c", c);
		try{
			String url=request.getParameter("type");
			if(url==null){
				request.getRequestDispatcher("/admin/browse.jsp").forward(request, response);
			}else{
				request.getRequestDispatcher("/admin/browse.jsp").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
	}

}