posttopic.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 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.web.Servlet;

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

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

	public void doAction(
			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;
		}
		String title = this.getParameter("title", request).trim();
		String content = this.getParameter("contentx", request);
		if ("".equals(title)) {
			this.alert("非法进入！", out);
			return;
		}
		if (content.trim().length() < 8) {
			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;
		}
		ITopicDAO td = factory.getTopicDAO();
		Topic topic = new Topic();
		topic.setForum(forumid);
		topic.setTitle(title);
		topic.setContent(content);
		topic.setAuthor(((User)request.getSession().getAttribute("usr")).getUsn());
		int id = td.insertTopicDAO(topic);
		if (id == -1) {
			this.alert("贴子发表失败！", out);
			this.back(out);
			return;
		} else {
			this.alert("贴子发表成功！", out);
			this.replace("../ShowTopicList?action=forum&forumid=" + forumid, out);
			return;
		}
	}
}