postcomment.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.sql.Timestamp;

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.Topic;
import cn.ialvin.bbs.bean.User;
import cn.ialvin.bbs.dao.DAOFactory;
import cn.ialvin.bbs.dao.ICommentDAO;
import cn.ialvin.bbs.dao.ITopicDAO;
import cn.ialvin.web.Servlet;

public class PostComment extends Servlet {
	private static final long serialVersionUID = 6422524851540390776L;
	public PostComment() { super(); }
	public void destroy() { super.destroy(); }

	public void doAction(
			HttpServletRequest request,
			HttpServletResponse response,
			PrintWriter out,
			DAOFactory factory)
			throws ServletException, IOException, SQLException {
		int id;
		try {
			id = this.getIParameter("topicid", request);
		} catch (Exception e) {
			this.alert("非法进入!", out);
			return;
		}
		String content = this.getParameter("contentx", request);
		if (content.trim().length()<8) {
			this.alert("评论内容太短!", out);
			this.back(out);
			return;
		}
		Object o = request.getSession().getAttribute("usr");
		User usr = (User)o;
		ITopicDAO td = factory.getTopicDAO();
		Topic topic = td.getTopic(id);
		if (topic == null) {
			this.alert("非法进入!", out);
			return;
		}
		ICommentDAO md = factory.getCommentDAO();
		Comment cmt = new Comment();
		cmt.setAuthor(usr.getUsn());
		cmt.setContent(content);
		cmt.setTopic(id);
		topic.setLastReply(new Timestamp(System.currentTimeMillis()));
		td.updateTopic(topic);
		md.insertComment(cmt);
		this.alert("发表评论成功!", out);
		this.replace("../ShowTopic?id=" + id, out);
	}
}