连接到 java RMI 服务器

Question

我是 Java RMI 的新手，我正在按照教程学习它。它使用服务器，代码清单如下所示，用于访问服务器

1. CalculatorServer.java

    public class CalculatorServer {
           public CalculatorServer(){
               try {
                   Calculator c = new CalculatorImpl();
                   Naming.rebind("rmi://localhost:1099/CalculatorService", c);
               } catch (Exception e) {
                   System.out.println("Trouble"+e);
               }
           }
           public static void main(String args[]){
               new CalculatorServer();
           }
       }
   

2. CalculatorImpl.java

    public class CalculatorImpl extends UnicastRemoteObject implements Calculator {
   
       //constructor
       public CalculatorImpl() throws RemoteException {
           super();
       }
   
       //@Override
       public long add(long a, long b) throws RemoteException {
           return a + b;
       }
   
       //@Override
       public long sub(long a, long b) throws RemoteException {
           return a - b;
       }
   
       //@Override
       public long mul(long a, long b) throws RemoteException {
           return a * b;
       }
   
      // @Override
       public long div(long a, long b) throws RemoteException {
           return a / b;
       }
   }
   

3.Calculator.java

  public interface Calculator extends Remote{
    public long add(long a, long b) throws RemoteException;
    public long sub(long a, long b) throws RemoteException;
    public long mul(long a, long b) throws RemoteException;
    public long div(long a, long b) throws RemoteException;
  }

当我调试程序时，这是 netbeans ide 控制台的错误； 它说这个错误：Troublejava.rmi.ServerException：RemoteException发生在服务器线程中；嵌套异常是： java.rmi.UnmarshalException：解组参数错误；嵌套异常是： java.lang.ClassNotFoundException: rmi.Calculator

Answer 1

听起来您没有运行 RMI 注册表，它是一个独立于 CalculatorServer 程序的进程。它位于您的 java bin 目录中。请稍等片刻，然后再次尝试您的代码。