Java RMI示例

给出Java RMI（Remote Method Invocation,远程方法调用）的示例。

示例

• HelloInterface.java

import java.rmi.Remote;
import java.rmi.RemoteException;

/**
 * Created by lbd on 2017/11/12.
 */
public interface HelloInterface extends Remote {
    public String helloWorld() throws RemoteException;

    public String sayHello(String name) throws RemoteException;
}

• HelloImpl.java

import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;

/**
 * Created by lbd on 2017/11/12.
 */
public class HelloImpl extends UnicastRemoteObject implements HelloInterface {
    public HelloImpl() throws RemoteException {}

    public String helloWorld() throws RemoteException {
        return "hello world!";
    }

    public String sayHello(String name) throws RemoteException {
        return "hello " + name + "!";
    }
}

• HelloServer.java

import java.net.MalformedURLException;
import java.rmi.AlreadyBoundException;
import java.rmi.Naming;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;

/**
 * Created by lbd on 2017/11/12.
 */
public class HelloServer {
    public static void main(String[] args) {
        try {
            HelloInterface hello = new HelloImpl();

            LocateRegistry.createRegistry(6789);

            Naming.bind("rmi://localhost:6789/rHello", hello);

            System.out.println("远程HelloInterface对象绑定成功,可以被调用");

        } catch (RemoteException e) {
            System.out.println("创建远程对象发生异常!");
            e.printStackTrace();
        } catch (MalformedURLException e) {
            System.out.println("url异常!");
            e.printStackTrace();
        } catch (AlreadyBoundException e) {
            System.out.println("重复绑定异常!");
            e.printStackTrace();
        }
    }
}

• HelloClient.java

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

/**
 * Created by lbd on 2017/11/12.
 */
public class HelloClient {
    public static void main(String[] args) {
        try {
            HelloInterface rHello = (HelloInterface) Naming.lookup("rmi://localhost:6789/rHello");
            System.out.println(rHello.helloWorld());
            System.out.println(rHello.sayHello("lbd"));
        } catch (RemoteException | MalformedURLException | NotBoundException e) {
            e.printStackTrace();
        }
    }
}

运行

程序运行顺序如下：

1. 运行HelloServer
2. 运行HelloClient

可进入我的博客查看原文

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