RMI 与 JNDI集成

[luozhangwen]

JNDI诞生的理由似乎很简单。随着分布式应用的发展，远程访问对象访问成为常用的方法。虽然说通过Socket等编程手段仍然可实现远程通信，但按照模式的理论来说，仍是有其局限性的。RMI技术，RMI-IIOP技术的产生，使远程对象的查找成为了技术焦点。JNDI技术就应运而生。JNDI技术产生后，就可方便的查找远程或是本地对象。

服务端:

package com.lzw.jndirmi;

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

public interface RmiSimple extends Remote{
       public String sayHello() throws RemoteException;
}

package com.lzw.jndirmi;

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

public class RmiSimpleImpl extends UnicastRemoteObject implements RmiSimple {
	private static final long serialVersionUID = 1L;

	protected RmiSimpleImpl() throws RemoteException {
		super();
	}

	public String sayHello() throws RemoteException {
		return "这是lzw's RMI与JNDI集成!!";
	}
}

package com.lzw.jndirmi;

import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.util.Properties;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;

public class RmiJndiSever {
	public static void main(String[] args) {
		try {
			LocateRegistry.createRegistry(8080);
			RmiSimple server = new RmiSimpleImpl();
			Properties properties = new Properties();
			//Context.INITIAL_CONTEXT_FACTORY = "java.naming.factory.initial";
			properties.setProperty(Context.INITIAL_CONTEXT_FACTORY , "com.sun.jndi.rmi.registry.RegistryContextFactory");
			properties.setProperty(Context.PROVIDER_URL, "rmi://localhost:8080");
			InitialContext ctx = new InitialContext(properties);
			ctx.bind("java:com/lzw.jndirmi/RmiSimple", server);
			ctx.close();
			System.out.println("RMI与JNDI集成服务启动.等待客户端调用...");
		} catch (RemoteException e) {
			e.printStackTrace();
		} catch (NamingException e) {
			e.printStackTrace();
		}

	}
}

[luozhangwen]

客户端..

package com.lzw.test;

import java.rmi.RemoteException;
import java.util.Properties;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;

import com.lzw.jndirmi.RmiSimple;

/**
 * RMI 与 JNDI集成
 * Properties  - java build path - project 引入服务端项目
 * @author lKF23467
 *
 */
public class JndiRmiClient {
	public static void main(String[] args) {
		Properties properties = new Properties();
		//Context.INITIAL_CONTEXT_FACTORY = "java.naming.factory.initial";
		properties.setProperty(Context.INITIAL_CONTEXT_FACTORY , "com.sun.jndi.rmi.registry.RegistryContextFactory");
		properties.setProperty(Context.PROVIDER_URL, "rmi://localhost:8080");
		try {
			InitialContext ctx = new InitialContext(properties);
			RmiSimple remote = (RmiSimple) ctx.lookup("java:com/lzw.jndirmi/RmiSimple");
			System.out.println(remote.sayHello());
		} catch (NamingException e) {
			e.printStackTrace();
		} catch (RemoteException e) {
			e.printStackTrace();
		}
	}
}