java實(shí)現(xiàn)單點(diǎn)登錄

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1、java實(shí)現(xiàn)單點(diǎn)登錄http://blog.csdn.net/defonds/archive/2009/05/05/4152153.aspxpackage?com.it.oa.sessionListener;import?java.util.List;import?java.util.Vector;import?javax.servlet.http.HttpSessionBindingEvent;import?javax.servlet.http.HttpSessionBindingListener;import?java.sql.*;public?class?

2、SessionListenerOnline?implements?HttpSessionBindingListener?{??private?Vector?users=new?Vector();??/**??*?返回登陸用戶的數(shù)量??*?@return??*/?public?int?getCount(){???????users.trimToSize();//調(diào)整Vector?users的容量為Vector?users的大小???????return?users.capacity();//返回users的容量?}??/**??*?檢查是否存在用戶??*?@par

3、am?userName??*?@return??*/?public?boolean?existUser(String?userName){???????users.trimToSize();???????boolean?existUser=false;???????for?(int?i=0;i

4、ak;???????????}???????}???????return?existUser;???}??/**??*?刪除用戶??*?@param?userName??*?@return??*/???public?boolean?deleteUser(String?userName){???????users.trimToSize();???????if(existUser(userName)){???????????int?currUserIndex=-1;???????????for(int?i=0;i

5、???????????if(userName.equals((String)users.get(i))){???????????????????currUserIndex=i;???????????????????break;???????????????}???????????}???????????if?(currUserIndex!=-1){???????????????users.remove(currUserIndex);???????????????users.trimToSize();???????????????return?true;?????

6、??????}???????}???????return?false;???}???/**????*?獲得在線用戶的id????*?@return????*/???public?Vector?getOnLineUser()???{???????return?users;???}public?void?valueBound(HttpSessionBindingEvent?e)?{?users.trimToSize();//???????System.out.println("請(qǐng)求：：：：：：：：：：："+e.getName());????if(!existUser

7、(e.getName())){????????users.add(e.getName());//????????System.out.print(e.getName()+"????登入到系統(tǒng)?"+(new?Date()));//????????System.out.println("??????在線用戶數(shù)為："+getCount());????????????}else{//????????System.out.println(e.getName()+"已經(jīng)存在");????????}}/**?*?session失效的時(shí)候修改全局變量和清空session?*/p

8、ublic?void?v