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

public class ShowTopicList extends Servlet {
	private static final long serialVersionUID = -1L;
	public ShowTopicList() { super(); }
	public void destroy() { super.destroy(); }

	public void doAction(
			HttpServletRequest request,
			HttpServletResponse response,
			PrintWriter out,
			DAOFactory factory)
			throws ServletException, IOException, SQLException {
		String action = this.getParameter("action", request);
		if ("forum".equals(action)) {
			this.showForumTopicList(request, response, out, factory);
		} else if ("usr".equals(action)) {
			this.shwoUserTopicList(request, response, out, factory);
		} else {
			this.alert("非法进入！", out);
		}
	}
	
	private void shwoUserTopicList(
			HttpServletRequest request,
			HttpServletResponse response,
			PrintWriter out,
			DAOFactory factory)
			throws ServletException, IOException, SQLException {
		String usn = this.getParameter("usn", request);
		IUserDAO ud = factory.getUserDAO();
		User vu = ud.getUser(usn);
		if (vu == null) {
			this.alert("非法进入!", out);
			return;
		}
		PageInfo page = new PageInfo();
		page.setPageSize(15);
		page.setWeight("贴");
		page.setQueryString("ShowTopicList?action=usr&usn="
				+ cn.ialvin.web.Encoder.encodeURIComponent(usn));
		ITopicDAO td = factory.getTopicDAO();
		ArrayList<Topic> topics = td.getTopics(usn, page);
		Forum forum = new Forum();
		forum.setId(-1);
		forum.setName(usn + "发表的贴子");
		request.setAttribute("forum", forum);
		request.setAttribute("topics", topics);
		request.setAttribute("pageInfo", page);
		request.setAttribute("title", forum.getName());
		request.getRequestDispatcher("forumdisplay.jsp").forward(request, response);
	}
	
	private void showForumTopicList(
			HttpServletRequest request,
			HttpServletResponse response,
			PrintWriter out,
			DAOFactory factory)
			throws ServletException, IOException, SQLException {
		int forumid;
		try {
			forumid = this.getIParameter("forumid", request);
		} catch (Exception e) {
			this.alert("非法进入！", out);
			return;
		}
		IForumDAO fd = factory.getForumDAO();
		Forum forum = fd.getForum(forumid);
		if (forum == null) {
			this.alert("非法进入！", out);
			return;
		}

		PageInfo page = new PageInfo();
		page.setPageSize(15);
		page.setWeight("贴");
		page.setQueryString("ShowTopicList?action=forum&forumid=" + forumid);
		try {
			page.setCurrentPage(this.getIParameter("page", request));
		} catch (Exception e) {
			page.setCurrentPage(1);
		}

		ITopicDAO td = factory.getTopicDAO();
		ArrayList<Topic> topics = td.getTopics(forumid, page);
		request.setAttribute("forum", forum);
		request.setAttribute("topics", topics);
		request.setAttribute("pageInfo", page);
		request.setAttribute("title", forum.getName());
		request.getRequestDispatcher("forumdisplay.jsp").forward(request, response);
	}
}