Java RMI 远程方法调用

最新推荐文章于 2021-02-27 02:15:37 发布

最新推荐文章于 2021-02-27 02:15:37 发布 · 120 阅读

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本文介绍了一个使用 Java RMI 技术实现的简单远程过程调用示例。该示例包括定义远程接口 RemoteDao，实现该接口的 RemoteDaoImpl 类，以及搭建服务器端与客户端的过程。通过此示例可以了解如何部署一个基本的 RMI 服务，并从客户端发起调用。

1.定义接口

package com.demo.rmi.dao.impl;

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

public interface RemoteDao extends Remote {

	public String say()throws RemoteException;
}

2.实现接口

package com.demo.rmi.dao.impl;

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

public class RemoteDaoImpl extends UnicastRemoteObject implements
		RemoteDao {

	public RemoteDaoImpl() throws RemoteException {
		super();
		// TODO Auto-generated constructor stub
	}
	@Override
	public String say() throws RemoteException {
		// TODO Auto-generated method stub

		return "[来自服务器的问候]:你好! 很高心见到你！";
	}
}

3.服务器端

package com.demo.rmi.server;

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

import com.demo.rmi.dao.impl.RemoteDaoImpl;
import com.demo.rmi.dao.impl.RemoteDao;

public class TestServer {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		try {
			LocateRegistry.createRegistry(1099);
			RemoteDao server=new RemoteDaoImpl();
			try {
				Naming.rebind("//127.0.0.1:1099/SAMPLE-SERVER", server);
				System.out.println("[服务已启动]");
			} catch (MalformedURLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		} catch (RemoteException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

4.客户端

package com.demo.rmi.client;

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

import com.demo.rmi.dao.impl.RemoteDaoImpl;
import com.demo.rmi.dao.impl.RemoteDao;

public class TestClient {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		try {
			try {
				RemoteDao server=(RemoteDao)Naming.lookup
						("//127.0.0.1:1099/SAMPLE-SERVER");
				System.out.println(server.say());
			} catch (MalformedURLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (NotBoundException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		} catch (RemoteException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}