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- ( void )connect {
    if  (self.xmppStream == nil) {
        self.xmppStream = [[XMPPStream alloc] init];
        [self.xmppStream addDelegate:self delegateQueue:dispatch_get_main_queue()];
    }
    if  (![self.xmppStream isConnected]) {
        NSString *username = [[NSUserDefaults standardUserDefaults] objectForKey:@ "username" ];
        XMPPJID *jid = [XMPPJID jidWithUser:username domain:@ "lizhen"  resource:@ "Ework" ];
        [self.xmppStream setMyJID:jid];
        [self.xmppStream setHostName:@ "10.4.125.113" ];
        NSError *error = nil;
        if  (![self.xmppStream connect:&error]) {
            NSLog(@ "Connect Error: %@" , [[error userInfo] description]);
        }
    }
}