chatclient.java

是一个使用了数据库的聊天系统

import java.net.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.Dialog.*;
import java.applet.*;
import javax.swing.*;
import javax.swing.JComponent.*;
import javax.swing.AbstractButton;
import javax.swing.JButton;
import javax.swing.ImageIcon;
import javax.swing.JScrollPane;
import java.util.StringTokenizer;

//import com.ms.com.Dispatch;

public class ChatClient extends JApplet implements Runnable, ActionListener {
  //protected Socket s = null;
  protected ObjectInputStream i;
  protected ObjectOutputStream o;
  protected	DataObject dO;
  //protected JTextArea listclient;
  protected JTextArea output;
  protected JList listclient;
  protected JTextField input;
  protected JButton b,bd;
  protected JButton send; //new added
  protected Thread listener;
  protected boolean first = true, kill=false;
  protected String name = "";
  protected JLabel initLabel, nameLabel;
  BufferedReader in = null;
  String serverResponse;
  TextField tf;
  public static Boolean fst = true;
  public static String usrnm = "";
   	public ChatClient(){
	}

   	public void init(){

            Socket s = null;

	    String hostName = "afs34.njit.edu";
        //  String hostName = "localhost";
	    int portno = 2585;

	    setForeground(java.awt.Color.black);
		setSize(200,200);

		JLabel initLabel = new JLabel(" All Messages Are Here ");
		JLabel initLabel1 = new JLabel(" Online USERS ");
		//0.98f, 0.97f, 0.85f
		initLabel1.setBackground(new Color(0.98f, 0.97f, 0.85f));//new added
		initLabel.setForeground(Color.black);
		initLabel1.setForeground(Color.blue);

		setLayout (new BorderLayout ());

		listclient=new JList();
    	listclient.setForeground(Color.red);
    	listclient.setOpaque(true);
    	listclient.setBorder(BorderFactory.createRaisedBevelBorder());
    	listclient.setBackground(new Color(0.98f, 0.97f, 0.85f)); ///new added
    	JScrollPane listScrollPane = new JScrollPane(listclient);
        Dimension preferredSize1 = new Dimension(200, 75);
        listScrollPane.setPreferredSize(preferredSize1);
listScrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);


        output = new JTextArea ();
        output.setEditable (false);
    	output.setForeground(Color.blue);
    	output.setBorder(BorderFactory.createRaisedBevelBorder());
    	output.setBackground(new Color(0.90f, 0.950f, 0.90f));///new added

    	JScrollPane topScrollPane = new JScrollPane(output);
        Dimension preferredSize = new Dimension(200, 75);
        topScrollPane.setPreferredSize(preferredSize);
topScrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
		input = new JTextField(30);
		input.setEditable (false);
		input.addActionListener(this);
    	input.setForeground(java.awt.Color.BLUE);
    	input.setBorder(BorderFactory.createLoweredBevelBorder());


    	//ImageIcon ButtonIcon = new ImageIcon("icon.jpeg");

		b = new JButton("CONNECT");
		b.setVerticalTextPosition(AbstractButton.CENTER);
        b.setHorizontalTextPosition(AbstractButton.LEADING);
        b.setMnemonic(KeyEvent.VK_D);
		b.addActionListener(this);

		//new added.....
		send = new JButton("SEND");
		send.setVerticalTextPosition(AbstractButton.CENTER);
        send.setHorizontalTextPosition(AbstractButton.LEADING);
        send.addActionListener(this);
        //new added.....

		bd = new JButton("DISCONNECT");
		bd.setVerticalTextPosition(AbstractButton.CENTER);
        	bd.setHorizontalTextPosition(AbstractButton.LEADING);
		bd.addActionListener(this);
		bd.setVisible(false);



		   //new added
			JPanel bottompanel = new JPanel();
			bottompanel.setLayout(new BorderLayout());
			bottompanel.add("West",input);
			bottompanel.add("East",send);
			//new added



		JPanel leftpanel = new JPanel();
		leftpanel.setLayout(new BorderLayout());
		leftpanel.add("North",initLabel);
		leftpanel.add("Center",topScrollPane);
		leftpanel.add("South",bottompanel);
		leftpanel.setBorder(BorderFactory.createBevelBorder(10, Color.blue, Color.gray));
		listclient.setBackground(new Color(0.98f, 0.97f, 0.85f));

		JPanel rightpanel = new JPanel();
		rightpanel.setLayout(new BorderLayout());
		rightpanel.add("North",initLabel1);

		rightpanel.add("Center",listScrollPane);
		rightpanel.add("South",b);
		rightpanel.setBorder(BorderFactory.createBevelBorder(2, Color.blue, Color.gray));


		JPanel gridpanel = new JPanel();
		gridpanel.setLayout(new BorderLayout());
		add(rightpanel,BorderLayout.CENTER);
		add(leftpanel, BorderLayout.WEST);

		gridpanel.setBorder(BorderFactory.createEtchedBorder(Color.black,Color.gray));

		b.requestFocus ();

		dO=new DataObject();
		try{

			s = new Socket(hostName, portno);
      		o = new ObjectOutputStream(s.getOutputStream());
			i = new ObjectInputStream(s.getInputStream());

    	}catch(Exception e){}

    	//if(!fst){
    		dO.setName("New User");
    		dO.setMessage("Connecting..");


    		try{
    			o.writeObject(dO);

    		}catch(IOException e){};

    		input.requestFocus ();
    		listener = new Thread (this);
    		listener.start ();
    		System.out.println(initLabel.getText());
    	}

	//}

	public synchronized void changeLabel(String newLabel){
		initLabel.setText(newLabel);
	}

	public void stop(){
		kill=true;
		listener = null;

	}

  	  public void run () {
     		if(kill){
          		return;
     		}
     		try {

      		while (true) {
	    			dO=(DataObject)i.readObject();
	    			if(dO.getMessage().startsWith("@")){
	       				listclient.clearSelection();
	    				String s1 = dO.getMessage();
	    				String tmp[] = new String[20];
	    				int n = s1.length();
	   				 	s1 = s1.substring(1, n);

	   				 	StringTokenizer st = new StringTokenizer(s1);
	   				 	int i = 0;
	   				 	while (st.hasMoreTokens()) {
	   				 		tmp[i] = (st.nextToken());
	   				 		i++;
	   				 	}
	   				 	listclient.setListData(tmp);
	    			}
	    			else{

	    				String line = dO.getName()+": "+dO.getMessage();
	    				output.append(line + "\n");
	    			}

      		}


    		} catch (IOException ex) {

    		} catch(ClassNotFoundException e){

    		} finally {
    			input.setVisible(false);
    			validate ();
    			try {
        			o.close ();
    			} catch (IOException ex) {

    				}
    		 }
  	}

  	public void actionPerformed(ActionEvent e) {

      		try {



      			if (e.getSource() == input) {

					dO.setName(name);
					dO.setMessage(input.getText());
      			}
      			//new added
      			if (e.getSource() == send) {

					dO.setName(name);
					dO.setMessage(input.getText());
      			}
      		//new added

      			if(e.getSource() == b){
      			  if(ChatClient.fst){
        			String s = (String)JOptionPane.showInputDialog("Please Enter User Name");
        			usrnm = s;
        			while(s == null || s.length() == 0){
        			    JOptionPane.showMessageDialog(null,"You Have To Connect, To enter in Chat System");
        				return;
        	    	}
      					dO.setName(s);
        				name=s;
        				dO.setMessage("@ HAS ENTERED");
        				input.setEditable (true);
        				input.requestFocus ();
        				ChatClient.fst=false;
      			 }
      			  else{
       				//dO.setName(usrnm);
      				//dO.setMessage("#Disconnecting");
      				/*input.setEditable(false);
      				output.setEdiatbe(false);
      				b.setVisible(false);
      				listclient.setVisible(false);
      				send.setVisible(false);//new added
      				*/
      				//kill=true;
      			  }
      			  }

      			o.writeObject(dO);
            	o.flush ();
            	if(kill){

            	}
      			} catch (IOException ex) {

        			kill=true;
      			}
      			input.setText ("");
      			//b.setLabel("DisConnect");
				b.setEnabled(false);
			return;

  			}
}