RMI的运用实例（直接代码+-*/）

最新推荐文章于 2021-02-16 08:05:06 发布

原创最新推荐文章于 2021-02-16 08:05:06 发布 · 465 阅读

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#exception #class #string #interface #div #server

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远程方法调用

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本文介绍了一个使用Java RMI实现的远程计算器服务示例。该服务包括定义远程接口的接口、实现该接口的服务端实现类及服务启动过程，还有客户端调用服务的方法。通过这个例子，读者可以了解到如何构建简单的RMI服务。

package rmiTest;
import java.rmi.Remote;

public interface Calculator extends Remote
{
public long add(long a, long b)
throws java.rmi.RemoteException;

public long sub(long a, long b)
throws java.rmi.RemoteException;

public long mul(long a, long b)
throws java.rmi.RemoteException;

public long div(long a, long b)
throws java.rmi.RemoteException;
}

package rmiTest;
import java.rmi.server.UnicastRemoteObject ;

public class CalculatorImpl extends UnicastRemoteObject implements Calculator
{

/**
*
*/
private static final long serialVersionUID = 1L;

public CalculatorImpl()
        throws java.rmi.RemoteException {
        super();
    }

    public long add(long a, long b)
        throws java.rmi.RemoteException {
        return a + b;
    }

    public long sub(long a, long b)
        throws java.rmi.RemoteException {
        return a - b;
    }

    public long mul(long a, long b)
        throws java.rmi.RemoteException {
        return a * b;
    }

    public long div(long a, long b)
        throws java.rmi.RemoteException {
        return a / b;
    }
}

package rmiTest;

import java.rmi.Naming;
import java.rmi.registry.LocateRegistry;

public class CalculatorServer {

   public CalculatorServer() {
     try {
       Calculator c = new CalculatorImpl();
       LocateRegistry.createRegistry(888);//端口注册
       Naming.rebind("rmi://localhost:888/CalculatorService", c);//绑定

     } catch (Exception e) {
       System.out.println( e.toString());
     }
   }

   public static void main(String args[]) {
     new CalculatorServer();
   }
}

package rmiTest;

import java.rmi.Naming;
import java.rmi.RemoteException;
import java.net.MalformedURLException;
import java.rmi.NotBoundException;

public class CalculatorClient {

    public static void main(String[] args) {
        try {
            Calculator c = (Calculator)
                           Naming.lookup(
                 "rmi://localhost:888/CalculatorService");//地址和端口根据server地址更改
            System.out.println( c.sub(4, 3) );
            System.out.println( c.add(4, 5) );
            System.out.println( c.mul(3, 6) );
            System.out.println( c.div(9, 3) );
        }
        catch (MalformedURLException murle) {
            System.out.println();
            System.out.println(
              "MalformedURLException");
            System.out.println(murle);
        }
        catch (RemoteException re) {
            System.out.println();
            System.out.println(
                        "RemoteException");
            System.out.println(re);
        }
        catch (NotBoundException nbe) {
            System.out.println();
            System.out.println(
                       "NotBoundException");
            System.out.println(nbe);
        }
        catch (
            java.lang.ArithmeticException
                                      ae) {
            System.out.println();
            System.out.println(
             "java.lang.ArithmeticException");
            System.out.println(ae);
        }
    }
}