chatapplet.java

简单java聊天室

import java.awt.Toolkit;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import java.awt.Dimension;
import java.lang.Object;


import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.io.PrintWriter;

import javax.swing.BorderFactory;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.border.Border;

class chat {
    boolean packFrame = false;
   

    /**
     * Construct and show the application.
     */
   
    public chat() {
        chat_client frame = new chat_client();
        // Validate frames that have preset sizes
        // Pack frames that have useful preferred size info, e.g. from their layout
        if (packFrame) {
            frame.pack();
        } else {
            frame.validate();
        }

        // Center the window
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        Dimension frameSize = frame.getSize();
        if (frameSize.height > screenSize.height) {
            frameSize.height = screenSize.height;
        }
        if (frameSize.width > screenSize.width) {
            frameSize.width = screenSize.width;
        }
        frame.setLocation((screenSize.width - frameSize.width) / 2,
                          (screenSize.height - frameSize.height) / 2);
        frame.setVisible(true);
        try {
            jbInit1();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
    
     private void jbInit1() throws Exception {
    }
}    

public class ChatApplet extends JApplet {
	public static String  hostname=null;
	boolean result;
    boolean isStandalone = false;
    BorderLayout borderLayout1 = new BorderLayout();
    Border border1;
    JPanel jPanel2 = new JPanel();
    Border border2;
    BorderLayout borderLayout2 = new BorderLayout();
    JPanel jPanel1 = new JPanel();
    JButton buttonSend = new JButton();
    JButton buttonClose = new JButton();
    BorderLayout borderLayout3 = new BorderLayout();
    JPanel jPanel3 = new JPanel();
    Border border3;
    BorderLayout borderLayout4 = new BorderLayout();
    JTextField textTalk = new JTextField("请输入聊天信息");
    JPanel jPanel4 = new JPanel();
    Border border4;
    BorderLayout borderLayout5 = new BorderLayout();
    JScrollPane jScrollPane1 = new JScrollPane();
    JTextArea textMessages = new JTextArea();

    PrintWriter out = null;

    /**Get a parameter value*/
    public String getParameter(String key, String def) {
        return isStandalone ? System.getProperty(key, def) :
            (getParameter(key) != null ? getParameter(key) : def);
    }

    /**Construct the applet*/
    
   JFrame frame;
   void set_frame(JFrame frame){this.frame=frame;}
   JFrame get_frame(){return this.frame;}
    public ChatApplet(String hostname) {
    	this.hostname=hostname;
    	//ChatApplet applet = new ChatApplet();
    	this.isStandalone = true;
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(3);
        frame.setTitle("客户端聊天");
        frame.getContentPane().add(this, BorderLayout.CENTER);
        this.init();
        this.start();
        frame.setSize(400,320);
        Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
        frame.setLocation((d.width - frame.getSize().width) / 2, (d.height - frame.getSize().height) / 2);
        frame.setVisible(true);
        set_frame(frame);
    }
    
    
    /**Initialize the applet*/
    public void init() {
        try {
            jbInit();

            Client client = new Client(this);
            if (client.isConnected())
               { out = client.getOutputStream();
                 appendMessage("恭喜恭喜连接成功!\n");
                 out.println("欢迎"+hostname+"到来\n");
                }
            else
                {appendMessage("连接失败，没有输入IP或着IP有误，请检查网络设备！");
                 buttonSend.setVisible(false);
                 jPanel1.add(buttonClose, BorderLayout.EAST);
                 buttonClose.setFocusPainted(false);
                 buttonClose.setText("关闭");
        
                 buttonClose.addActionListener(new java.awt.event.ActionListener() {
                 public void actionPerformed(ActionEvent e){
                 buttonClose_actionPerformed(e);
            }
        });
                 
                 
                }
        }
        catch(Exception e) {
            e.printStackTrace();
        }
        
    }
    /**Component initialization*/
    private void jbInit() throws Exception {
        border1 = BorderFactory.createEmptyBorder(9,9,9,9);
        border2 = BorderFactory.createEmptyBorder(9,9,9,9);
        border3 = BorderFactory.createEmptyBorder(2,0,2,5);
        border4 = BorderFactory.createEmptyBorder(0,0,5,0);
        this.setSize(new Dimension(400,300));
        this.getContentPane().setLayout(borderLayout1);
        jPanel2.setBorder(border2);
        jPanel2.setLayout(borderLayout2);
        buttonSend.setFocusPainted(false);
        buttonSend.setText("发  送");
        buttonSend.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(ActionEvent e){
                buttonSend_actionPerformed(e);
                
            }
        });
       
       
        jPanel1.setLayout(borderLayout3);
        jPanel3.setBorder(border3);
        jPanel3.setLayout(borderLayout4);
        jPanel4.setBorder(border4);
        jPanel4.setLayout(borderLayout5);
        textTalk.addKeyListener(new java.awt.event.KeyAdapter() {
            public void keyPressed(KeyEvent e) {
                textTalk_keyPressed(e);
            }
        });
        this.getContentPane().add(jPanel2, BorderLayout.CENTER);
        jPanel2.add(jPanel1, BorderLayout.SOUTH);
        jPanel1.add(buttonSend, BorderLayout.EAST);
        jPanel1.add(jPanel3, BorderLayout.CENTER);
        jPanel3.add(textTalk, BorderLayout.CENTER);
        jPanel2.add(jPanel4, BorderLayout.CENTER);
        jPanel4.add(jScrollPane1, BorderLayout.CENTER);
        jScrollPane1.getViewport().add(textMessages, null);
    }
    /**Get Applet information*/
    public String getAppletInfo() {
        return "Applet Information";
    }
    /**Get parameter info*/
    public String[][] getParameterInfo() {
        return null;
    }
    
    
    
    	
   
    /**Main method*/
    public static void main(String[] args) {
       
       SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.
                                             getSystemLookAndFeelClassName());
                } catch (Exception exception) {
                    exception.printStackTrace();
                }

                new chat();
            }
        });
    }
    static {
        try {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
          
        }
        catch(Exception e) {
        	System.out.print(e.getMessage());
        }
    }
    
   

    public void appendMessage(String message) {
        textMessages.setText(message + textMessages.getText());
    }

    void buttonSend_actionPerformed(ActionEvent e) {
        String msg;
        msg = textTalk.getText().trim();
        if (msg.equals("") || msg == null)  return ;

       // out.println(hostname+":"+textTalk.getText());
        out.println(hostname+":"+msg);
        textTalk.setText("");
    }

    void buttonClose_actionPerformed(ActionEvent e) {
    	get_frame().dispose();
    	}
    	
    void textTalk_keyPressed(KeyEvent e) {
        if (e.getKeyChar() != '\n') return;
        out.println(hostname+":"+textTalk.getText());
        textTalk.setText("");
    }
}