连接到java RMI服务器

Question

我是java RMI的新手，我正在跟随教程学习它。它使用服务器，下面的代码清单用于访问服务器

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.可

  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，这里是netbeans ide控制台的错误;它说这个错误:麻烦java.rmi. serverexception: RemoteException发生在服务器线程;嵌套异常是:java.rmi.UnmarshalException:解组参数错误;嵌套异常是:java.lang.ClassNotFoundException: rmi。计算器

Answer 1

听起来您没有运行RMI注册表，这是与CalculatorServer程序分开的一个进程。它位于java bin目录中。给它一点时间启动，然后再次尝试您的代码。