Java RMI 远程方法调用Remote Method Invocation
转载：http://www.cnblogs.com/yangchongxing/p/9078061.html
1、创建远程方法接口(必须继承自java.rmi.Remote接口)
package cn.ycx.date; import java.rmi.Remote;
import java.rmi.RemoteException; public interface DateRemote extends Remote {
public String now() throws RemoteException;
}
2、创建远程服务实现
远程对象必须实现java.rmi.server.UniCastRemoteObject类，该类的构造函数中将生成stub(存根)和skeleton(骨架)， 这样才能保证客户端访问获得远程对象时，该远程对象将会把自身的一个拷贝以Socket的形式传输给客户端，此时客户端所获得的这个拷贝称为Stub（存根），而服务器端本身已存在的远程对象则称之为Skeleton（骨架）。其实此时的存根是客户端的一个代理，用于与服务器端的通信， 而骨架也可认为是服务器端的一个代理，用于接收客户端的请求之后调用远程方法来响应客户端的请求。
package cn.ycx.server; import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;
import java.text.SimpleDateFormat;
import java.util.Date; import cn.ycx.date.DateRemote; public class DateRemoteImpl extends UnicastRemoteObject implements DateRemote {
private static final long serialVersionUID = -4892445365627614558L;
protected DateRemoteImpl() throws RemoteException {
super();
}
@Override
public String now() throws RemoteException {
SimpleDateFormat format = new SimpleDateFormat("yyy-MM-dd HH:mm:ss");
return format.format(new Date());
}
}
3、启动远程服务
package cn.ycx.server; import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
// java cn.ycx.server.ServerTest
public class ServerTest {
//rmiregistry
public static void main(String[] args) {
try {
Registry registry = LocateRegistry.createRegistry(1099);
registry.bind("dateRemote", new DateRemoteImpl());
} catch (Exception e) {
e.printStackTrace();
}
System.out.println("RMI Server is ready...");
}
}
4、创建客户端实现
package cn.ycx.client; import java.net.MalformedURLException;
import java.rmi.Naming;
import java.rmi.NotBoundException;
import java.rmi.RemoteException; import cn.ycx.date.DateRemote; // java -jar client.jar
public class ClientTest { public static void main(String[] args) {
DateRemote dateRemote;
try {
dateRemote = (DateRemote) Naming.lookup("rmi://192.168.1.190:1099/dateRemote");//
System.out.println(dateRemote.now());
} catch (MalformedURLException e) {
} catch (RemoteException e) {
} catch (NotBoundException e) {
}
}
}
导出为可执行jar
java -jar client.jar
运行结果：2018-05-23 17:26:58