import com.github.steveice10.packetlib.tcp.TcpSessionFactory; //导入依赖的package包/类
public void connect(String host, int port) throws RequestException {
    Client client = new Client(host, port, account.getProtocol(), new TcpSessionFactory(proxy));
    this.session = client.getSession();

    switch (account.getGameVersion()) {
        case VERSION_1_11:
            client.getSession().addListener(new SessionListener111(this));
            break;
        case VERSION_1_12:
            client.getSession().addListener(new SessionListener112(this));
            break;
        default:
            throw new IllegalStateException("Unknown session listener");
    }

    client.getSession().connect();
}
 

import com.github.steveice10.packetlib.tcp.TcpSessionFactory; //导入依赖的package包/类
@Override
public void connect() {
    String host;
    int port;
    String username;
    String verificationKey;
    if(this.password != null) {
        try {
            ServerList.login(this.username, this.password);
        } catch(AuthenticationException e) {
            throw new BotException("Failed to authenticate MinecraftClassicModule.", e);
        }

        ServerURLInfo info = ServerList.getServerURLInfo(this.serverUrl);
        host = info.getHost();
        port = info.getPort();
        username = info.getUsername();
        verificationKey = info.getVerificationKey();
    } else {
        host = this.host;
        port = this.port;
        username = this.username.contains("@") ? this.username.substring(0, this.username.indexOf("@")) : this.username;
        verificationKey = this.verificationKey;
    }

    this.conn = new Client(host, port, new ClassicProtocol(username, verificationKey), new TcpSessionFactory());
    this.conn.getSession().addListener(new BotListener());
    this.conn.getSession().connect();
}
 

import com.github.steveice10.packetlib.tcp.TcpSessionFactory; //导入依赖的package包/类
@Override
public void connect() {
    try {
        this.conn = new Client(this.host, this.port, new MinecraftProtocol(this.username, this.password, false), new TcpSessionFactory());
        this.conn.getSession().addListener(new BotListener());
        this.conn.getSession().connect();
    } catch(RequestException e) {
        throw new BotException("Failed to authenticate MinecraftModule.", e);
    }
}