src/com/sanqing/servlet/GetMessage.java

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package com.sanqing.servlet;

import java.io.IOException;
import java.util.List;

import javax.servlet.RequestDispatcher;
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.sanqing.bean.Criticism;
import com.sanqing.bean.Message;
import com.sanqing.bean.Reply;
import com.sanqing.dao.CriticismDAO;
import com.sanqing.dao.MessageDAO;
import com.sanqing.dao.ReplyDAO;
import com.sanqing.factory.CriticismDAOFactory;
import com.sanqing.factory.MessageDAOFactory;
import com.sanqing.factory.ReplyDAOFactory;
import com.sanqing.util.Page;
import com.sanqing.util.PageUtil;

public class GetMessage extends HttpServlet {
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		int messageID = Integer.
			parseInt(request.getParameter("messageID"));//取得消息编号
		MessageDAO messageDAO
			= MessageDAOFactory.getMessageAOInstance();//获得MessageDAO实例
		Message message = 
			messageDAO.findMessageById(messageID);//查询该编号对应的消息
		request.setAttribute("message", message); //将消息保存在request范围
		
		//获得该消息对应的所有回复
		int currentPage = 0;
		String currentPageStr = request.
					getParameter("currentPage");//获得消息回复列表的当前页信息
		if(currentPageStr == null || "".equals(currentPageStr)){
			currentPage = 1;
		}else {
			currentPage = Integer.parseInt(currentPageStr);
		}
		ReplyDAO replayDAO = ReplyDAOFactory.getReplyDAOInstance();
		Page page = PageUtil.createPage(5, replayDAO.
						findCountByMsgID(messageID), currentPage);//设置分页信息
		List<Reply> replys = replayDAO.
						findReplayByMsgID(messageID, page);//分页查询消息回复
		request.setAttribute("replyList", replys);//保存消息回复列表
		request.setAttribute("page", page);//保存分页信息
		
		//获得该消息对象的批复
		CriticismDAO criticismDAO = CriticismDAOFactory.getCriticismDAOInstance();
		Criticism criticism = criticismDAO.findCriticismByMsgID(messageID);
		request.setAttribute("criticism", criticism);
		
		ServletContext servletContext = getServletContext();
		RequestDispatcher dispatcher = servletContext.
					getRequestDispatcher("/showMsg.jsp");	//跳转到消息显示页