JNDI服务提供者连接工厂之RegistryContextFactory（RMI）

来源：互联网发布：淘宝安装师傅怎么加盟编辑：程序博客网时间：2024/05/01 03:37

服务接口：

package com.zzj.jndi.service;import java.rmi.Remote;import java.rmi.RemoteException;public interface JndiService extends Remote {public int getNext() throws RemoteException;}

服务实现类：

package com.zzj.jndi.service.impl;import java.rmi.RemoteException;import java.rmi.server.UnicastRemoteObject;import com.zzj.jndi.service.JndiService;/** * Unicast：单播（点到点） * @author lenovo * */public class JndiServiceImpl extends UnicastRemoteObject implements JndiService {private static final long serialVersionUID = 1L;private int next;public JndiServiceImpl() throws RemoteException {super();}/** * 非线程安全的 */public int getNext() throws RemoteException {return ++next;}}

发布服务：

package com.zzj.jndi.provider;import java.rmi.registry.LocateRegistry;import java.util.Hashtable;import javax.naming.Context;import javax.naming.InitialContext;import com.zzj.jndi.service.JndiService;import com.zzj.jndi.service.impl.JndiServiceImpl;public class RmiServiceProvider {final static String CONTEXT_FACTORY = "com.sun.jndi.rmi.registry.RegistryContextFactory";final static String PROVIDER_URL = "rmi://localhost:8080";public static void main(String[] args) throws Exception {//注册RMI服务器端口        LocateRegistry.createRegistry(8080);        Hashtable<String, Object> env = new Hashtable<>();env.put(Context.INITIAL_CONTEXT_FACTORY, CONTEXT_FACTORY);env.put(Context.PROVIDER_URL, PROVIDER_URL);Context ctx = new InitialContext(env);JndiService jndiService = new JndiServiceImpl();ctx.bind("jndiService", jndiService);System.out.println("Jndi服务已绑定...");}}

服务提供者启动之后，会开启端口监听来自客户端的请求。

客户端：

package com.zzj.jndi.client;import java.util.Hashtable;import javax.naming.Context;import javax.naming.InitialContext;import com.zzj.jndi.service.JndiService;public class RmiJndiClient {final static String CONTEXT_FACTORY = "com.sun.jndi.rmi.registry.RegistryContextFactory";final static String PROVIDER_URL = "rmi://localhost:8080";public static void main(String[] args) throws Exception {Hashtable<String, Object> env = new Hashtable<>();env.put(Context.INITIAL_CONTEXT_FACTORY, CONTEXT_FACTORY);env.put(Context.PROVIDER_URL, PROVIDER_URL);Context ctx = new InitialContext(env);JndiService jndiService = (JndiService) ctx.lookup("jndiService");for (int i = 0; i < 5; i++) {System.out.println(jndiService.getNext());}System.out.println("-------------------");JndiService jndiService2 = (JndiService) ctx.lookup("jndiService");for (int i = 0; i < 5; i++) {System.out.println(jndiService2.getNext());}}}

客户端运行结果：

12345-------------------678910

再次运行客户端：

1112131415-------------------1617181920

由运行结果可知：RMI绑定的对象是单例的，如果在绑定的对象中有成员变量，则会有线程安全的问题。

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