连接到Java RMI服务器

Question

我是新来的Java RMI，我正在跟随一个教程来了解它。它使用一台服务器，代码列表如下用于获取服务器

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控制台发生的错误; 它说这个错误：Troublejava.rmi.ServerException：在服务器线程中发生RemoteException;嵌套的异常是： java.rmi.UnmarshalException：错误解组参数;嵌套的异常是： java.lang.ClassNotFoundException：rmi.Calculator

Answer 1

这听起来像你没有运行RMI注册表，这是从你的CalculatorServer程序单独的过程。它位于你的java bin目录中。给它一些启动时间，然后再次尝试你的代码。