我正在编写一个 RMI 计算器程序。我创建了以下 .java 文件。按照指导方针，我到了必须运行服务应用程序的地步。为此，我键入
启动 rmiregistry
并打开一个新的空白窗口。然后我尝试通过键入以下内容来启动计算器服务：
java计算器服务
然后什么也没有发生。
我的指导方针说“我必须确保从与存储服务器的目录相同的目录运行注册表”。
你觉得你能帮我解决这个问题吗？这是我的所有代码：
计算器.java
import java.rmi.Remote;
import java.rmi.RemoteException;
public interface Calculator extends java.rmi.Remote
{
/*
* method for addition
*/
public double add(double x, double y)
throws RemoteException;
/*
* method for subtraction
*/
public double subtract(double x, double y)
throws RemoteException;
/*
* method for multiplication
*/
public double multiply(double x, double y)
throws RemoteException;
/*
* method for division
*/
public double divide(double x, double y)
throws RemoteException;
}
远程计算器.java
import java.rmi.server.UnicastRemoteObject;
import java.rmi.RemoteException;
public class RemoteCalculator extends UnicastRemoteObject implements Calculator
{
public RemoteCalculator() throws RemoteException
{
}
/*
* method for addition
*/
public double add(double x, double y)
{
return x+y;
}
/*
* method for subtraction
*/
public double subtract(double x, double y)
{
return x-y;
}
/*
* method for multiplication
*/
public double multiply(double x, double y)
{
return x*y;
}
/*
* method for division
*/
public double divide(double x, double y)
{
return x/y;
}
}
计算器服务.java
import java.rmi.Naming;
import java.rmi.RemoteException;
import java.rmi.RMISecurityManager;
public class CalculatorService
{
public static void main(String[] args) throws RemoteException,java.net.MalformedURLException
{
RemoteCalculator remcalc = new RemoteCalculator();
Naming.rebind("CalcService", remcalc);
}
}
计算器客户端.java
import java.rmi.Naming;
public class CalculatorClient
{
public static void main(String[] args)
{
double x = Double.parseDouble(args[1]);
double y = Double.parseDouble(args[2]);
try
{
//Connect to the calculator service
Calculator calc = (Calculator) Naming.lookup("rmi://" + args[0] + "/CalcService");
System.out.println("Client bound: OK");
//Add the numbers
System.out.println(x + " + " + y + " = " + calc.add(x, y));
//Subtract the numbers
System.out.println(x + " - " + y + " = " + calc.subtract(x, y));
//Multiply the numbers
System.out.println(x + " * " + y + " = " + calc.multiply(x, y));
//Divide the numbers
System.out.println(x + " / " + y + " = " + calc.divide(x, y));
}
catch (java.rmi.NotBoundException nbe)
{
System.out.println("Client bound: error: " + nbe);
}
catch (java.net.MalformedURLException mue)
{
System.out.println("Client bound: error: " + mue);
} catch (java.rmi.RemoteException re)
{
}
}
}