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我的代碼顯示不出用戶信息 大神看看那里錯(cuò)了

import?java.util.ArrayList;

import?javax.servlet.annotation.WebListener;
import?javax.servlet.http.HttpSessionEvent;
import?javax.servlet.http.HttpSessionListener;

import?Entity.User;
import?SessionUtil.SessionUtil;

@WebListener
public?class?MyHttpSession?implements?HttpSessionListener?{
	
	private?int?number?=?0;

	@Override
	public?void?sessionCreated(HttpSessionEvent?arg0)?{
		number++;
		arg0.getSession().getServletContext().setAttribute("Number",?number);
	}

	@Override
	public?void?sessionDestroyed(HttpSessionEvent?arg0)?{
		number--;
		arg0.getSession().getServletContext().setAttribute("Number",?number);
		ArrayList<User>?userlist?=?null;//在線用戶List
		
		userlist?=?(ArrayList<User>)?arg0.getSession().getServletContext()
				.getAttribute("userlist");
		String?sessionid?=?arg0.getSession().getId();
		if?(SessionUtil.getUserBySessionId(userlist,sessionid)!=null)?{
			userlist.remove(SessionUtil.getUserBySessionId(userlist,?sessionid));
			System.out.println("刪除的sessionId為:"+sessionid);
		}

	}

}
public?class?MyServletRequest?implements?ServletRequestListener?{
?????????private??ArrayList<User>?userlist;
	@Override
	public?void?requestDestroyed(ServletRequestEvent?arg0)?{
		?

	}
public?void?requestInitialized(ServletRequestEvent?arg0)?{
		//不是第一次登錄就可以從上下文中獲取userlist
		userlist??=?(ArrayList<User>)arg0.getServletContext().getAttribute("userlist");
		//第一次登錄
		if(userlist==null){
			userlist?=?new?ArrayList<User>();
		}
		HttpServletRequest?request?=?(HttpServletRequest)?arg0.getServletRequest();
		//得到session?id
		String?sessionIdString?=?request.getSession().getId();
		//如果userlist有改id??則不加入userlist??沒(méi)有則創(chuàng)建一個(gè)user?加入userlist中
		if(SessionUtil.getUserBySessionId(userlist,sessionIdString)==null){
			User?user?=?new?User();
			user.setSessionIdString(sessionIdString);
			user.setSessionTime(new?SimpleDateFormat("yyyy-MM-dd?HH:mm:ss").format(new?Date()));
			user.setUserurl(request.getRemoteAddr());
			userlist.add(user);
			System.out.println("加入的用戶sessionId為:"+sessionIdString);
		}
		//添加userList到application(ServletContext的對(duì)象
		arg0.getServletContext().setAttribute("userlist",userlist);
	}

	

}

jsp頁(yè)面:

<body>
????當(dāng)前在線用戶人數(shù):${Number?}<br/>
????<%?
???ArrayList<Entity.User>??userlist?=??(ArrayList<Entity.User>)request.getServletContext().getAttribute("userlist");?
???if(userlist!=null){
???????for(int?i?=?0?;?i?<?userlist.size()?;?i++){
????	??Entity.User?user?=?userlist.get(i);
???%>
???
????IP:<%=user.getSessionIdString()?%>,FirstTime:<%=user.getSessionTime()?%>,SessionId:<%=user.getUserurl()?%>?<br/>
????<%}
????
????}?
????else{
????out.println("無(wú)用戶");
????}%>
??</body>
public?class?SessionUtil?{
??????
	public?static?Object?getUserBySessionId(ArrayList<User>?userList,?String?sessionIdString)?{
		for?(int?i?=?0;?i?<?userList.size();?i++)?{
			User?user?=?userList.get(i);
			if?(user.getSessionIdString().equals(sessionIdString))?{
				return?user;
			}
		}
		return?null;
	}
	
}


正在回答

3 回答

MyServletRequest這個(gè)類沒(méi)有監(jiān)聽

0 回復(fù) 有任何疑惑可以回復(fù)我~

你用注解的方式注冊(cè)了監(jiān)聽器啊

0 回復(fù) 有任何疑惑可以回復(fù)我~

好吧 ?尷尬了 ? ?我沒(méi)有注冊(cè)request那個(gè)監(jiān)聽器

0 回復(fù) 有任何疑惑可以回復(fù)我~

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我的代碼顯示不出用戶信息 大神看看那里錯(cuò)了

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