newpostservlet.java

这是从网上下载下来的一个计算程序

package com.lovo.bbs.servlet;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;

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

import com.lovo.bbs.bo.ForumBo;
import com.lovo.bbs.bo.ForumStatBo;
import com.lovo.bbs.bo.PostBo;
import com.lovo.bbs.vo.ForumStatVo;
import com.lovo.bbs.vo.ForumVo;
import com.lovo.bbs.vo.PostVo;
import com.lovo.bbs.bo.TopicBo;
import com.lovo.bbs.bo.UserInfoBo;

public class NewPostServlet extends HttpServlet {
	private static final long serialVersionUID = 3473498779003225960L;

	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		this.doPost(req, resp);
	}

	@SuppressWarnings("unchecked")
	protected synchronized void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		// 取得参数
		String topicid = req.getParameter("topicid");
		String forumid = req.getParameter("postforumid");
		String postTitle = new String(req.getParameter("posttitle").getBytes(
				"ISO-8859-1"), "utf-8");
		String postAuthorName = new String(req.getParameter("postauthorname")
				.getBytes("ISO-8859-1"), "utf-8");
		String postContent = new String(req.getParameter("postcontent")
				.getBytes("ISO-8859-1"), "utf-8");
		// 构造Vo
		PostVo postvo = new PostVo();
		postvo.setTopicid(Integer.parseInt(topicid));
		postvo.setPosttitle(postTitle);
		postvo.setUsername(postAuthorName);
		postvo.setContent(postContent);

		// 更新回帖表
		int postid = new PostBo().addOnePost(postvo);

		ServletContext context = req.getSession().getServletContext();
		// 更新数据库论坛表当前论坛信息
		new ForumBo().addOnePost(Integer.parseInt(forumid));
		// 更新内存中当前论坛信息
		ArrayList<ForumVo> forumList = (ArrayList<ForumVo>) context
				.getAttribute("forumList");
		Iterator<ForumVo> it = forumList.iterator();
		ForumVo thisForum = null;
		while (it.hasNext()) {
			thisForum = it.next();
			if (thisForum.getForumID() == Integer.parseInt(forumid)) {
				break;
			}
		}
		thisForum.setPostNum(thisForum.getPostNum()+1);
		context.setAttribute("forumList", forumList);
		HashMap<Integer,ForumVo> forumMap = (HashMap<Integer,ForumVo>)context.getAttribute("forumMap");
		forumMap.put(thisForum.getForumID(), thisForum);
		context.setAttribute("forumMap", forumMap);
		
		//更新网站杂项信息表
		new ForumStatBo().addOnePost();
		//更新内存中网站杂项信息
		ForumStatVo forumInfo = (ForumStatVo)context.getAttribute("forumInfo");
		forumInfo.setPostNum(forumInfo.getPostNum()+1);
		context.setAttribute("forumInfo", forumInfo);
		
		//更新主题表
		new TopicBo().addOnePost(postid,Integer.parseInt(topicid));
		
		//更新用户表
		new UserInfoBo().addOnePost(postAuthorName);
		
		// 转向至新主题页
		if (postid != 0) {
			resp.sendRedirect("topic.jsp?tid=" + topicid);
		}
	}

}