JavaRMI で HelloWorld する方法

Ⅰ. はじめに

タイトルの通り「JavaRMI で HelloWorld する方法」です。

Ⅱ. やり方

1. サンプルプログラムを書く

com/company/client/Client.java

package com.company.client;

import com.company.core.Common;
import com.company.core.IHello;

import java.rmi.NotBoundException;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;

public class Client {
  public static void main(String[] args) throws RemoteException, NotBoundException {
    Registry reg = LocateRegistry.getRegistry(Common.RMI_HOST, Common.RMI_PORT);
    IHello hello = (IHello) reg.lookup(Common.RMI_NAME);

    System.out.println(hello.helloWorld("tanaka"));
  }
}

com/company/core/Common.java

package com.company.core;

public class Common {
  public static final String RMI_NAME = "MyServer";
  public static final String RMI_HOST = "10.226.0.1";
  public static final int RMI_PORT = 1099;
}

com/company/core/IHello.java

package com.company.core;

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

public interface IHello extends Remote {
  String helloWorld(String name) throws RemoteException;
}

com/company/server/Hello.java

package com.company.server;

import com.company.core.IHello;

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

public class Hello extends UnicastRemoteObject implements IHello {
  protected Hello() throws RemoteException {
    super();
  }

  @Override
  public String helloWorld(String name) throws RemoteException {
    return "hello world " + name;
  }
}

com/company/server/Server.java

package com.company.server;

import com.company.core.Common;

import java.rmi.AlreadyBoundException;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;

public class Server{
  public static void main(String[] args) throws RemoteException, AlreadyBoundException {
    Registry registry = LocateRegistry.createRegistry(Common.RMI_PORT);
    registry.bind(Common.RMI_NAME, new Hello());

    System.out.println("server started");
  }
}

2. コンパイルする

javac^
  -d out^
  src/com/company/client/Client.java^
  src/com/company/core/Common.java^
  src/com/company/core/IHello.java^
  src/com/company/server/Hello.java^
  src/com/company/server/Server.java

3. サーバを起動する

java -classpath out com.company.server.Server

4. クライアントを起動する

java -classpath out com.company.client.Client

実行結果

hello world tanaka

参考

https://docs.oracle.com/javase/jp/1.5.0/guide/rmi/hello/hello-world.html