[myOnlinesWeb2]网站在线用户信息，网站访问量以及管理员踢出用户实例

package cn.hncu.servlet; import java.io.IOException; import java.io.PrintWriter; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.HashMap; import java.util.Iterator; import java.util.List; import java.util.Map; import java.util.Map.Entry; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; public class ShowServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { Map<String, HttpSession> onLines = (Map<String, HttpSession>) getServletContext().getAttribute("onLines"); List<Map<String, Object>> lists = new ArrayList<Map<String,Object>>(); SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); //遍历onlines，针对每个session对象封装一个map(信息包含:name,createTime,lastAccessTime,ip)，把该map添加到list当中 Iterator<Entry<String, HttpSession>> it = onLines.entrySet().iterator(); while(it.hasNext()){ Entry<String, HttpSession> en = it.next(); Map<String, Object> m = new HashMap<String, Object>(); m.put("id", en.getValue().getId() ); m.put("user", en.getValue().getAttribute("user")); String creationTime = sdf.format(new Date(en.getValue().getCreationTime())); m.put("creationTime", creationTime); String lastAccessTime = sdf.format( new Date(en.getValue().getLastAccessedTime()) ); m.put("lastAccessTime", lastAccessTime); //注意,该ip数据是在CharsetFilter中封装的 m.put("ip", en.getValue().getAttribute("ip")); lists.add(m); } request.setAttribute("onLines", lists); request.getRequestDispatcher("/jsps/show.jsp").forward(request, response); } }