关于java方法的跨系统远程调用

被调用端：系统注册调用信息

 private static Registry reg;

    public static void start()
    {
        try
        {//注册端口信息
            reg = LocateRegistry.createRegistry(Integer.parseInt((String)ConfigUtil.getValue("rmi_port")));

            // 可以用不同名字注册不同的实例 被调用的方法实现
            SystemUsabilityRmiImpl rmi = new SystemUsabilityRmiImpl();
            // Naming.rebind("follo_rmi", rmi); 注册名称
            reg.bind((String)ConfigUtil.getValue("rmi_name"), rmi);
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }

 调用端：

try {
		//注册端口，ip，调用名
		String ip = RmiConfigUtil.getValue("rmi_ip");
		String port = RmiConfigUtil.getValue("rmi_port");
		String rmi_name = RmiConfigUtil.getValue("rmi_name");
				
			SystemUsabilityRmi s = (SystemUsabilityRmi) Naming.lookup("rmi://"+ip+":"+port+"/"+rmi_name);
				isSuccess=s.updateSystemUsability(serviceId,level);
			} catch (MalformedURLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (RemoteException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (NotBoundException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}

 附：调用端接口SystemUsabilityRmi只需声明，无需实现。 此接口中的方法updateSystemUsability必须与被调用端注册的SystemUsabilityRmiImpl 实现中方法同名！

public interface SystemUsabilityRmi extends Remote{
    
    /**
     * 
     * @param id
     * @return
     * @throws RemoteException
     */
    public boolean updateSystemUsability(String id,int level) throws RemoteException;
}