Java Rmi 远程方法调用

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一：服务端暴露服务

import java.rmi.Remote;import java.rmi.RemoteException;/** * 1.定义远程接口，必须继承Remote接口， * 2.远程调用的方法必须抛出RemoteException异常  */public interface ISayHello extends Remote {/** * @param name * @return * @throws RemoteException  远程调用方法必须抛出RemoteException */public String doSayHello(String name) throws RemoteException;}

import java.rmi.RemoteException;import com.xx.service.ISayHello;/** * 远程接口实现 */public class ChinaSayHello implements ISayHello {public String doSayHello(String name) throws RemoteException {return "您好," + name;}}

import java.net.MalformedURLException;import java.rmi.AlreadyBoundException;import java.rmi.Naming;import java.rmi.Remote;import java.rmi.RemoteException;import java.rmi.registry.LocateRegistry;import java.rmi.server.UnicastRemoteObject;import com.xx.service.ISayHello;import com.xx.service.impl.ChinaSayHello;/** *  * 暴露远程服务 */public class ServerMain {public static void main(String[] args) {//创建远程对象ISayHello sayHello = new ChinaSayHello();//urlString serviceUrl = "//localhost:9999/sayhello";//java 默认对口是1099final int registryPort = 9999;//暴露服务exporter(sayHello, registryPort, serviceUrl);}/** * 暴露服务 * @param object * @param registryPort * @param serviceUrl */public static void exporter(Remote object,int registryPort, String serviceUrl) {int servicePort = 0;try {UnicastRemoteObject.exportObject(object, servicePort);LocateRegistry.createRegistry(registryPort);Naming.bind(serviceUrl, object);System.out.println("绑定成功.");} catch (RemoteException e) {e.printStackTrace();} catch (MalformedURLException e) {e.printStackTrace();} catch (AlreadyBoundException e) {e.printStackTrace();}}}

二：客户端远程方法调用

import java.net.MalformedURLException;import java.rmi.Naming;import java.rmi.NotBoundException;import java.rmi.RemoteException;import com.xx.service.ISayHello;/** * 客户端 */public class ClientMain {public static void main(String[] args) throws RemoteException {// 查找远程对象 ISayHello sayHello= getObject(ISayHello.class, "rmi://localhost:9999/sayhello");// 远程方法调用System.out.println(sayHello.doSayHello("张三"));}public static <T> T getObject(Class<T> clazs, String serviceUrl) {try {Object object = Naming.lookup(serviceUrl);return clazs.cast(object);} catch (MalformedURLException e) {e.printStackTrace();} catch (RemoteException e) {e.printStackTrace();} catch (NotBoundException e) {e.printStackTrace();}throw new RuntimeException();}}