client.java

适于初学者学习的基于rmi的java聊天器

package client;
import java.awt.BorderLayout;
import java.awt.Frame;
import java.awt.TextArea;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import java.rmi.Naming;
import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;
import message.MessageReceiver;
import message.MessageServer;
/**
 * coder: taie
 */
public class Client extends Frame implements MessageReceiver,
      ActionListener{
    TextField tf;
    TextArea ta;
    static String name;
    static MessageServer server;
    public Client()throws RemoteException{
        setTitle(name);
        setLayout(new BorderLayout());
        tf=new TextField(30);
        tf.addActionListener(this);
        add("South",tf);
        ta=new TextArea(20,20);
        add("Center",ta);
        addWindowListener(new WindowCloser());
        UnicastRemoteObject.exportObject(this);
    }
    public void actionPerformed(ActionEvent e){
        try{
            server.send(name,tf.getText());
        }catch(Exception ea){
            System.out.println("Client exception "+ea.getMessage());
            ea.printStackTrace();
        }
        tf.setText("");
        tf.selectAll();
    }
    public void print(String s){
        ta.append(s+"\n");
    }
    public static void main(String[] args){
        if(args.length<1){
            System.out.println("usage:java client.client ClientName.");
            System.exit(-1);
        }
        name=args[0];
        try{
            Client cf=new Client();
            cf.pack();
            cf.show();
            server=(MessageServer)Naming.lookup(
                    MessageServer.SERVER_NAME);
            int s=server.register(args[0],cf);
            if(s==MessageServer.FAILURE)throw new Exception(
                    "could not connect to server.");
        }catch(Exception e){
            System.err.println("Client exception: "+e.getMessage());
            e.printStackTrace();
            System.exit(-1);
        }
    }
    
}

class WindowCloser extends WindowAdapter{
    public void windowClosing(WindowEvent e){
        System.exit(-1);
    }    
}