[vc_row][vc_column][vc_column_text]This project shows how to use Java to create an IM chat application on pcDuino.[/vc_column_text][vc_tour][vc_tab title=”Test Result” tab_id=”1395197300-1-57″][vc_column_text]Run the server, modify the server IP address on the client side code.

[/vc_column_text][/vc_tab][vc_tab title=”Test Code” tab_id=”1395197300-2-11″][vc_column_text]Service side code

import java.net.*;
import java.util.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;

public class ChatServer extends Frame
{
 TextArea ta = new TextArea();
 public void launchFrame()
 {
  add(ta, BorderLayout.CENTER);
  setBounds(0,0,200,300); 
  this.addWindowListener(
   new WindowAdapter() 
   {
    public void windowClosing(WindowEvent e)
    {
     System.exit(0);
    }
   }
   );
  setVisible(true);
 }

 ServerSocket server = null;
 Collection cClient = new ArrayList();

 public ChatServer(int port) throws Exception
 {
  server = new ServerSocket(port);
  launchFrame();
 }

 public void startServer() throws Exception
 {
  while(true)
  {
   Socket s = server.accept();
   cClient.add( new ClientConn(s) );
   ta.append("NEW-CLIENT " + s.getInetAddress() + ":" + s.getPort());
   ta.append("n" + "CLIENTS-COUNT: " + cClient.size() + "nn");
  }
 }

 class ClientConn implements Runnable
 {
  Socket s = null;
  public ClientConn(Socket s)
  {
   this.s = s;
   (new Thread(this)).start();
  }

  public void send(String str) throws IOException
  {
   DataOutputStream dos = new DataOutputStream(s.getOutputStream());
   dos.writeUTF(str);
  }

  public void dispose()
  {
   try {
    if (s != null) s.close();
    cClient.remove(this);
    ta.append("A client out! n");
    ta.append("CLIENT-COUNT: " + cClient.size() + "nn");
   }
   catch (Exception e)
   {
    e.printStackTrace();
   }
  }

  public void run()
  {
   try {

    DataInputStream dis = new DataInputStream(s.getInputStream());
    String str = dis.readUTF();
    while(str != null && str.length() !=0)
    {
     System.out.println(str);
     for(Iterator it = cClient.iterator(); it.hasNext(); )
     {
      ClientConn cc = (ClientConn)it.next();
      if(this != cc)
      {
       cc.send(str);
      }
     }
     str = dis.readUTF();
     //send(str);
    }
    this.dispose();
   } 
   catch (Exception e) 
   {
    System.out.println("client quit");
    this.dispose();
   }

  }
 }

 public static void main(String[] args) throws Exception
 {
  ChatServer cs = new ChatServer(8888);
  cs.startServer();
 }
}

Client side code

import java.io.*;
import java.net.*;
import java.awt.*;
import java.awt.event.*;

public class ChatClient extends Frame
{
 /**
     * 
     */
private String ip="192.168.137.1";
private static final long serialVersionUID = 1L;
TextArea ta = new TextArea();
 TextField tf = new TextField();
 public void launchFrame() throws Exception
 {
  this.add(ta, BorderLayout.CENTER);
  this.add(tf, BorderLayout.SOUTH);
  tf.setText("Client side:");
  tf.addActionListener(
   new ActionListener() 
   {
    public void actionPerformed(ActionEvent ae)
    {
     try {
      String sSend = tf.getText();
      if(sSend.trim().length() == 0) return;
      ChatClient.this.send(sSend);
      tf.setText("Client side:");
      ta.append(sSend + "n");
     }
     catch (Exception e) { e.printStackTrace(); }
    }
   }
   );

  this.addWindowListener(
   new WindowAdapter() 
   {
    public void windowClosing(WindowEvent e)
    {
     System.exit(0);
    }
   }
   );
  setBounds(300,300,300,400);
  setVisible(true);
  tf.requestFocus();
 }

 Socket s = null;

 public ChatClient() throws Exception
 {
  s = new Socket(ip, 8888);
  launchFrame();
  (new Thread(new ReceiveThread())).start();
 }

 public void send(String str) throws Exception
 {
  DataOutputStream dos = new DataOutputStream(s.getOutputStream());
  dos.writeUTF(str);
 }

 public void disconnect() throws Exception
 {
  s.close();
 }

 public static void main(String[] args) throws Exception
 {
  BufferedReader br = new BufferedReader (
        new InputStreamReader(System.in));
  ChatClient cc = new ChatClient();
  String str = br.readLine();
  while(str != null && str.length() != 0)
  {
   cc.send(str);
   str = br.readLine();
  }
  cc.disconnect();
 }

 class ReceiveThread implements Runnable
 {
  public void run()
  {
   if(s == null) return;
   try {
    DataInputStream dis = new DataInputStream(s.getInputStream());
    String str = dis.readUTF();
    while (str != null && str.length() != 0)
    {
     //System.out.println(str);
     ChatClient.this.ta.append(str + "n");
     str = dis.readUTF();
    }
   } 
   catch (Exception e)
   {
    e.printStackTrace();
   }

  }
 }
}

[/vc_column_text][/vc_tab][/vc_tour][vc_column_text]

[/vc_column_text][/vc_column][/vc_row]