SSH版最大会话连接数

在登录方法中加入如下两行语句，作为程序的入口：

 SessionListener.isAlreadyEnter(getHttpRequest().getSession(),this.getUserCode(),loginUser)

getHttpRequest().getSession().setAttribute("isLoginIn", "LoginIn");

在SessionListener类中做相关的踢出处理：

1. 1. import java.util.HashMap;
   2.  
      import java.util.Iterator;
   3.  
      import java.util.Map;
   4.  
      import javax.servlet.ServletRequestEvent;
   5.  
      import javax.servlet.ServletRequestListener;
   6.  
      import javax.servlet.http.HttpServletRequest;
   7.  
      import javax.servlet.http.HttpSession;
   8.  
      import javax.servlet.http.HttpSessionAttributeListener;
   9.  
      import javax.servlet.http.HttpSessionBindingEvent;
   10.  
       import javax.servlet.http.HttpSessionEvent;
   11.  
       import javax.servlet.http.HttpSessionListener;
   12.  
       import org.apache.struts2.ServletActionContext;
   13.  
       import com.hhwy.iepip.framework.message.Message;
   14.  
       import com.opensymphony.xwork2.ActionContext;
   15.  
        
   16.  
       public class SessionListener implements HttpSessionListener,ServletRequestListener,HttpSessionAttributeListener{
   17.  
       public static Map<String, HttpSession> sessionMap = new HashMap<String, HttpSession>();
   18.  
       public static Map<String, HttpSession> sessionMap1 = new HashMap<String, HttpSession>();
   19.  
       private static Boolean onlyOne = Boolean.valueOf(Message.getMessage("session.onlyone"));
   20.  
       private HttpServletRequest request ;
   21.  
        
   22.  
       /**获取request对象*/
   23.  
       public void requestInitialized(ServletRequestEvent event) {
   24.  
       request = (HttpServletRequest)event.getServletRequest();
   25.  
       }
   26.  
        
   27.  
       /**以下是实现HttpSessionListener中的方法:该方法登录与否都会执行**/
   28.  
       public void sessionCreated(HttpSessionEvent se){
   29.  
       }
   30.  
        
   31.  
       /**以下是实现HttpSessionListener中的方法**/
   32.  
       public void sessionDestroyed(HttpSessionEvent se){
   33.  
       hUserName.remove(se.getSession().getId());
   34.  
       UserObject.remove(se.getSession().getId());
   35.  
       if(sessionMap!=null){
   36.  
       sessionMap.remove(se.getSession().getId());
   37.  
       }
   38.  
       if(sessionMap1!=null){
   39.  
       sessionMap1.remove(se.getSession().getId());
   40.  
       }
   41.  
       }
   42.  
       /**
   43.  
       * isAlreadyEnter-用于判断用户是否已经登录以及相应的处理方法
   44.  
       * <该方法是系统业务的方法，不是处理单个用户登录的问题，以该方法做为程序的入口>
   45.  
       */
   46.  
       public static boolean isAlreadyEnter(HttpSession session,String sUserName,LoginUserInfo loginTriggers){
   47.  
       boolean flag = false;
   48.  
       return flag;
   49.  
       }
   50.  
        
   51.  
       /**
   52.  
       * 此方法，可以在登录时候添加一个session 用以判断是否已经登录，然后再进行登录人登录控制
   53.  
       */
   54.  
       public void attributeAdded(HttpSessionBindingEvent event) {
   55.  
       //如果只允许一个账号一处登陆,单台客户端电脑只允许一个用户登录
   56.  
       if(onlyOne.booleanValue()){
   57.  
       String name = event.getName();
   58.  
       if(name.equals("isLoginIn")){
   59.  
       // 单台客户端电脑只允许一个用户登录
   60.  
       String ipAddr = this.getIpAddr(request);
   61.  
       //如果原先已登录，则踢出原先登陆的
   62.  
       if(sessionMap1.containsKey(ipAddr) ){
   63.  
       try{
   64.  
       sessionMap1.get(ipAddr).invalidate();
   65.  
       } catch(Exception e){}
   66.  
       sessionMap1.remove(ipAddr);
   67.  
       }
   68.  
       if(ipAddr != null && event.getSession().isNew())
   69.  
       sessionMap1.put(ipAddr, event.getSession());
   70.  
        
   71.  
       //只允许一个账号一个客户端登陆
   72.  
       String userName= getUserName(event);
   73.  
       if(sessionMap.containsKey(userName) ){
   74.  
       try{
   75.  
       sessionMap.get(userName).invalidate();
   76.  
       } catch(Exception e){}
   77.  
       sessionMap.remove(userName);
   78.  
       }
   79.  
       if(userName != null && event.getSession().isNew())
   80.  
       sessionMap.put(userName, event.getSession());
   81.  
       }
   82.  
       }
   83.  
       }
   84.  
        
   85.  
       public static String getIpAddr(HttpServletRequest request) {
   86.  
       String ip = request.getHeader( "x-forwarded-for");
   87.  
       if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
   88.  
       ip = request.getHeader( "Proxy-Client-IP");
   89.  
       }
   90.  
       if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
   91.  
       ip = request.getHeader( "WL-Proxy-Client-IP");
   92.  
       }
   93.  
       if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
   94.  
       ip = request.getRemoteAddr();
   95.  
       }
   96.  
       return ip;
   97.  
       }
   98.  
        
   99.  
       /*获取session中存储的用户名*/
   100.  
        private String getUserName(HttpSessionBindingEvent se) {
   101.  
        String userName = null;
   102.  
        return userName;
   103.  
        }
   104.  
         
   105.  
        public void attributeRemoved(HttpSessionBindingEvent event) {
   106.  
        // TODO Auto-generated method stub
   107.  
        }
   108.  
         
   109.  
        public void attributeReplaced(HttpSessionBindingEvent arg0) {
   110.  
        // TODO Auto-generated method stub
   111.  
        }
   112.  
         
   113.  
        public void requestDestroyed(ServletRequestEvent arg0) {
   114.  
        // TODO Auto-generated method stub
   115.  
        }
   116.