showtopic.java

又一个课程设计 简易 JSP 论坛 功能较简单的那种, 界面上模仿了 Discuz JSP 本来就学的不行, 只是尽量实现了 MVC

package cn.ialvin.bbs.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.SQLException;
import java.util.ArrayList;

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

import cn.ialvin.bbs.bean.Comment;
import cn.ialvin.bbs.bean.Forum;
import cn.ialvin.bbs.bean.Topic;
import cn.ialvin.bbs.bean.User;
import cn.ialvin.bbs.dao.DAOFactory;
import cn.ialvin.bbs.dao.ICommentDAO;
import cn.ialvin.bbs.dao.IForumDAO;
import cn.ialvin.bbs.dao.IManagerDAO;
import cn.ialvin.bbs.dao.ITopicDAO;
import cn.ialvin.bbs.dao.IUserDAO;
import cn.ialvin.web.PageInfo;
import cn.ialvin.web.Servlet;

public class ShowTopic extends Servlet {
	private static final long serialVersionUID = 1L;

	public ShowTopic() { super(); }
	public void destroy() { super.destroy(); }

	public void doAction(
			HttpServletRequest request,
			HttpServletResponse response,
			PrintWriter out,
			DAOFactory factory)
			throws ServletException, IOException, SQLException {
		int topicid;
		try {
			topicid = this.getIParameter("id", request);
		} catch (Exception e) {
			this.alert("非法进入！", out);
			return;
		}
		int index;
		try {
			index = this.getIParameter("page", request);
		} catch (Exception e1) {
			index = 1;
		}
		IForumDAO fd = factory.getForumDAO();
		ITopicDAO td = factory.getTopicDAO();
		IUserDAO ud = factory.getUserDAO();
		ICommentDAO cd = factory.getCommentDAO();
		IManagerDAO md = factory.getManagerDAO();
		Topic topic = td.getTopic(topicid);
		topic.setView(topic.getView()+1);
		td.updateTopic(topic);
		Forum forum = fd.getForum(topic.getForum());
		User author = ud.getUser(topic.getAuthor());
		
		PageInfo page = new PageInfo();
		page.setQueryString("ShowTopic?id=" + topicid);
		page.setCurrentPage(index);
		page.setPageSize(10);
		page.setWeight("条评论");
		ArrayList<Comment> comments = cd.getComments(topic.getId(), page);

		Object obj = request.getSession().getAttribute("usr");
		if (obj != null) {
			User usr = (User)obj;
			request.setAttribute("isManager", String.valueOf(md.isManager(usr.getUsn(), topic.getForum())));
		}
		request.setAttribute("userDAO", ud);
		request.setAttribute("comments", comments);
		request.setAttribute("author", author);
		request.setAttribute("topic", topic);
		request.setAttribute("forum", forum);
		request.setAttribute("page", page);
		request.getRequestDispatcher("/topicdisplay.jsp").forward(request, response);
	}
}