getchatdo.java

一个bbs论坛系统

package com.lovo.servlet;

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

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

import com.lovo.po.PublicChatDO;
import com.lovo.po.UserPO;

public class GetChatDO extends HttpServlet{



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

	protected void doPost(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		request.setCharacterEncoding("utf-8");
		response.setContentType("text/html;charset=utf-8");
		response.setCharacterEncoding("utf-8");
		ServletContext application=this.getServletContext();
		HttpSession session=request.getSession();
		
		
		PrintWriter out = response.getWriter();
		/**得到最大显示行数*/
		String s= application.getInitParameter("maxRows");
   		int maxRows=Integer.parseInt(s);

		List<PublicChatDO> chatList=(List<PublicChatDO>)application.getAttribute("chatList");
		if(chatList==null){
			chatList=new ArrayList<PublicChatDO>();
			application.setAttribute("chatList", chatList);
		}
		if(chatList.size()>maxRows){
			for(int i=0;i<chatList.size()-maxRows+1;i++){
				chatList.remove(i);
			}
		}
		String currentUser=((UserPO)session.getAttribute("user")).getName();
		String sendContent="";
		for(int i=0;i<chatList.size();i++){
			String sendUser=((UserPO)((PublicChatDO)chatList.get(i)).getSendUser()).getName();
			String publicChat=((PublicChatDO)chatList.get(i)).getPublicChat();
			
			if(currentUser.equals(sendUser)){
				sendContent=sendContent+"你说: "+publicChat+"<br>";
			}
			else{
				sendContent=sendContent+currentUser+"说: "+publicChat+"<br>";
			}
			
		}
//		System.out.println(currentUser+" "+sendContent);
		out.print(sendContent);
		
	}

}