Creating the Remote Interface
To create the client-server application using RMI, you need to create a remote interface that declares the business logic of the application. The FileRemote.java file is a remote interface for the File Download application that defines the prototypes of the methods implemented by the FileRemoteImpl.java file.
Listing 3-1 shows the contents of the FileRemote.java file:
Listing 3-1: The FileRemote.java File
/* Imports java.rmi package classes. */
import java.rmi.Remote;
import java.rmi.RemoteException;
/* Imports java.util package classes. */
import java.util.Vector;
/*
Interface FileRemote - This interface declares the remote methods.
Methods:
downloadFile() - Downloads the file from a remote location.
displayList() - Displays the list of files stored in the server to the client.
*/
public interface FileRemote extends Remote
{
/* Declares downloadFile() method. */
public byte[] downloadFile(String filename) throws RemoteException;
/* Declares displayList() method. */
public Vector displayList() throws RemoteException;
}
Download this Listing.
In the above code:
-
The FileRemote interface defines the methods to perform various operations of the File Download application. These methods include displayList() and downloadFile().
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The displayList() method displays the file list to the client machine.
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The downloadFile() method downloads the selected file from the remote machine.
