deletecomment.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.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.IManagerDAO;
import cn.ialvin.bbs.dao.ITopicDAO;
import cn.ialvin.web.Servlet;

public class DeleteComment extends Servlet {
	private static final long serialVersionUID = -3715588695755649239L;
	public DeleteComment() { 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("id", request);
		} catch (Exception e) {
			this.alert("非法进入", null);
			return;
		}
		Object o = request.getSession().getAttribute("usr");
		if (o == null) {
			this.alert("非法进入!", null);
			return;
		}
		User usr = (User)o;

		ICommentDAO cd = factory.getCommentDAO();
		ITopicDAO td = factory.getTopicDAO();
		IManagerDAO md = factory.getManagerDAO();
		Comment com = cd.getComment(id);
		Topic topic = td.getTopic(com.getTopic());
		if (usr.isAdmin() || md.isManager(usr.getUsn(), topic.getForum())) {
			cd.deleteComment(id);
			this.alert("删除评论成功", out);
			this.replace("../ShowTopic?id=" + topic.getId(), out);
		} else {
			this.alert("非法进入!", out);
		}
	}
}