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        Java远程调用库通常指的是Java RMI(Remote Method Invocation)或者Java的远程调用框架,比如Apache Dubbo、Spring Cloud等。以下是使用JDK自带的Java RMI进行远程调用的简单步骤:
public interface RemoteService extends Remote {
    String sayHello() throws RemoteException;
}
public class RemoteServiceImpl extends UnicastRemoteObject implements RemoteService {
    public RemoteServiceImpl() throws RemoteException {
        super();
    }
    @Override
    public String sayHello() throws RemoteException {
        return "Hello from remote server!";
    }
}
public class Server {
    public static void main(String[] args) throws RemoteException, MalformedURLException {
        RemoteService remoteService = new RemoteServiceImpl();
        Naming.rebind("rmi://localhost/RemoteService", remoteService);
        System.out.println("Server started.");
    }
}
public class Client {
    public static void main(String[] args) throws RemoteException, NotBoundException, MalformedURLException {
        RemoteService remoteService = (RemoteService) Naming.lookup("rmi://localhost/RemoteService");
        System.out.println(remoteService.sayHello());
    }
}
需要注意的是,Java RMI在实际应用中并不常用,通常会选择使用其他远程调用框架,比如Apache Dubbo、Spring Cloud等。这些框架提供了更多的功能和更方便的使用方式,可以根据具体需求选择适合的远程调用框架。
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