這里用的smack 4.3.4，有一些改變要注意：
import org.jivesoftware.smack.AbstractXMPPConnection;
import org.jivesoftware.smack.ConnectionConfiguration;
import org.jivesoftware.smack.tcp.XMPPTCPConnection;
import org.jivesoftware.smack.tcp.XMPPTCPConnectionConfiguration;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.SSLSession;
import java.net.InetAddress;
public class Main {
public static void main(String[] args) {
Main.init();
}
public static AbstractXMPPConnection init(){
AbstractXMPPConnection connection = null;
try {
System.out.println("正在登錄，，，");
XMPPTCPConnectionConfiguration configuration = XMPPTCPConnectionConfiguration.builder()
.setHostAddress(InetAddress.getByName("127.0.0.1"))//代替setHost
.setXmppDomain("localhost")//主機名，setServercName已過時
.setUsernameAndPassword("admin","pass")//賬號密碼
.setSecurityMode(ConnectionConfiguration.SecurityMode.disabled)//安全驗證方式，不設定的話似乎要安裝證書之類的
.build();
connection=new XMPPTCPConnection(configuration);
connection.connect();
System.out.println("服務器連接成功！");
connection.login();
System.out.println("登錄成功！");
}catch (Exception e){
System.out.println("登錄失敗！！！");
}
return connection;
}
}
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