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. 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.