chatclient.java

java实例 本实例是初学java的人全程学习的很好辅助材料,从最简单的入门至后面可以自己开发出一个应用程序出来

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import javax.swing.*;
import java.net.*;
import java.io.*;

public class ChatClient extends JFrame  implements Runnable{
  boolean isStandalone = false;
  public ChatClient() {
     enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
 }
  public void init() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }

  /**Main method*/
  public static void main(String[] args) {
    ChatClient c = new ChatClient();
    c.show();
   }

  JPanel contentPane;
  JTextField txtInput = new JTextField();
  JButton btnSend = new JButton();
  JButton btnStart = new JButton();
  List lstMsg = new List();

  Socket sock;
  Thread thread;
  BufferedReader in;
  PrintWriter out;
  public final static int DEFAULT_PORT = 6543;
  boolean bConnected;

  	public void startConnect() {
		bConnected = false;
		try {
			//sock = new Socket(this.getCodeBase().getHost(), DEFAULT_PORT);
            sock = new Socket( "127.0.0.1",DEFAULT_PORT);
            bConnected = true;
			processMsg("Connection ok");
            in = new BufferedReader(new InputStreamReader(sock.getInputStream()));
            out = new java.io.PrintWriter(sock.getOutputStream());
		} catch(IOException e) {
			e.printStackTrace();
			processMsg("Connection failed");
		}
		if(thread == null) {
			thread = new Thread(this);
			thread.start();
		}
	}

    public void run(){
		while(true){
		    try{
		        String msg = receiveMsg();
		        Thread.sleep(100L);  //????
		        if( msg != null ){
		            processMsg( msg );
		        }
		    } catch( IOException e ){
                e.printStackTrace();
		    } catch( InterruptedException ei){}
		}
    }

    public  void sendMsg(String msg) throws IOException{
			out.println( msg );
			out.flush();
	}

	public  String receiveMsg()  throws IOException{
		String msg = new String();
		try {
			msg = in.readLine();
		} catch(IOException e) {
             e.printStackTrace();
		}
		return msg;
	}

   	public void processMsg( String str ){
        this.lstMsg.add(str);
	}

    private void jbInit() throws Exception  {
    txtInput.setText("please input here");
    txtInput.setBounds(new Rectangle(42, 234, 196, 34));
    contentPane = (JPanel) this.getContentPane();
    contentPane.setLayout(null);
    this.setSize(new Dimension(500, 300));
    this.setTitle("Chat Client");
    btnSend.setText("Send");
    btnSend.setBounds(new Rectangle(258, 235, 70, 35));
    btnSend.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        btnSend_actionPerformed(e);
      }
    });
    btnStart.setText("Connect To Server");
    btnStart.setBounds(new Rectangle(338, 235, 150, 35));
    btnStart.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        btnStart_actionPerformed(e);
      }
    });
    lstMsg.setBounds(new Rectangle(42, 32, 319, 192));
    contentPane.add(txtInput, null);
    contentPane.add(btnSend, null);
    contentPane.add(btnStart, null);
    contentPane.add(lstMsg, null);
  }

   void btnSend_actionPerformed(ActionEvent e) {
        if( txtInput.getText() .length() != 0 ){
			try{
                  sendMsg( txtInput.getText() );
			}catch(IOException e2){ processMsg(e2.toString());}
	   }
  }

  void btnStart_actionPerformed(ActionEvent e) {
    this.startConnect() ;
  }

  //static initializer for setting look & feel
  static {
    try {
      //UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
      //UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
    }
    catch(Exception e) {
    }
  }
}