我嘗試從 dbus 服務獲取一些數據并在 Java 中使用它。我可以使用以下命令在 cli 中獲取信息：dbus-send --print-reply --system --dest=com.victronenergy.solarcharger.ttyUSB0 /Dc/0/Voltage com.victronenergy.BusItem.GetValue結果是：method return time=1538903662.321580 sender=:1.14 -> destination=:1.806 serial=335692 reply_serial=2variant       double 13.43我試圖用 Java 獲取這些數據的是：經過數小時的閱讀，我創建了一個界面。package javadbus;import java.util.Map;import org.freedesktop.dbus.DBusInterface;import org.freedesktop.dbus.DBusSignal;import org.freedesktop.dbus.Variant;import org.freedesktop.dbus.exceptions.DBusException;public interface BusItem extends DBusInterface{   public static class PropertiesChanged extends DBusSignal   {      public final Map<String,Variant> changes;      public PropertiesChanged(String path, Map<String,Variant> changes) throws DBusException      {         super(path, changes);         this.changes = changes;      }   }  public String GetDescription(String language, int length);  public Variant GetValue();  public String GetText();  public int SetValue(Variant value);  public Variant GetMin();  public Variant GetMax();  public int SetDefault();  public Variant GetDefault();}在這里，我成功調用了 getConnection() 和 getRemoteObject()。package javadbus;import org.freedesktop.dbus.DBusConnection;import org.freedesktop.dbus.exceptions.DBusException;import org.freedesktop.dbus.Variant;public class VictronEnergyDBusSolarCharger {private String port;private DBusConnection conn;public VictronEnergyDBusSolarCharger(String port) {    this.port = port;    try {        this.conn = DBusConnection.getConnection(DBusConnection.SYSTEM);    } catch (DBusException e) {        // TODO Auto-generated catch block        e.printStackTrace();    }}是否有必要實現此方法 GetValue？但是為什么例如我應該怎么做呢？我只想獲取此信息，而不是像服務器一樣提供它。