Um pouco mais de instruções no README

- Local variable socket IP address moved to socket class
- AlarmClock now is just a scheduler
- Still working on message too long error

README.md

@@ -1,2 +1,10 @@
 # shareMySheet
 ScreenCast System to share your Screen
+
+Baixe o jar no endereço:
+
+https://github.com/flschiavoni/shareMySheet/releases
+
+Rode ele com java -jar ShareMySheet-20170126.jar
+
+Seja feliz!

build.xml

@@ -0,0 +1,43 @@
+<project name="ShareMySheet" default="dist" basedir=".">
+  <description>
+    ScreenCast Build file
+  </description>
+  <!-- set global properties for this build -->
+  <property name="src" location="src"/>
+  <property name="build" location="build"/>
+  <property name="dist" location="dist"/>
+  <property name="ant.build.javac.source" value="1.7"/>
+  <property name="ant.build.javac.target" value="1.7"/>
+
+  <target name="init">
+    <!-- Create the time stamp -->
+    <tstamp/>
+    <!-- Create the build directory structure used by compile -->
+    <mkdir dir="${build}"/>
+  </target>
+
+  <target name="compile" depends="init" description="compile the source">
+    <!-- Compile the java code from ${src} into ${build} -->
+    <javac srcdir="${src}" destdir="${build}"/>
+  </target>
+
+  <target name="dist" depends="compile"
+        description="generate the distribution">
+    <!-- Create the distribution directory -->
+    <mkdir dir="${dist}/lib"/>
+
+    <!-- Put everything in ${build} into the MyProject-${DSTAMP}.jar file -->
+    <jar destfile="${dist}/lib/ShareMySheet-${DSTAMP}.jar" basedir="${build}">
+        <manifest>
+            <attribute name="Main-Class" value="br.edu.ufsj.sms.Main"/>
+        </manifest>
+    </jar>
+  </target>
+
+  <target name="clean"
+        description="clean up">
+    <!-- Delete the ${build} and ${dist} directory trees -->
+    <delete dir="${build}"/>
+    <delete dir="${dist}"/>
+  </target>
+</project>

src/br/edu/ufsj/sms/GUI/ChatWindow.java

@@ -0,0 +1,97 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package br.edu.ufsj.sms.GUI;
+
+import java.awt.event.KeyEvent;
+
+/**
+ *
+ * @author flavio
+ */
+public class ChatWindow extends javax.swing.JDialog {
+
+    private javax.swing.JButton jButton1;
+    private javax.swing.JEditorPane jEditorPane1;
+    private javax.swing.JPanel jPanel1;
+    private javax.swing.JPanel jPanel2;
+    private javax.swing.JScrollPane jScrollPane1;
+    private javax.swing.JScrollPane jScrollPane2;
+    private javax.swing.JSplitPane jSplitPane1;
+    private javax.swing.JTextArea jTextArea1;
+
+    private MainWindow mainWindow;
+
+    public ChatWindow(MainWindow mainWindow) {
+        this.mainWindow = mainWindow;
+        initComponents();
+    }
+
+    /**
+     * This method is called from within the constructor to initialize the form.
+     * WARNING: Do NOT modify this code. The content of this method is always
+     * regenerated by the Form Editor.
+     */
+    private void initComponents() {
+
+        this.setDefaultCloseOperation(javax.swing.WindowConstants.HIDE_ON_CLOSE);
+        this.setTitle("Chat Window");
+        this.setBounds(new java.awt.Rectangle(0, 0, 800, 600));
+        this.getContentPane().setLayout(new java.awt.BorderLayout(5, 5));
+        this.setPreferredSize(new java.awt.Dimension(800, 600));
+
+        jSplitPane1 = new javax.swing.JSplitPane();
+        jScrollPane1 = new javax.swing.JScrollPane();
+        jEditorPane1 = new javax.swing.JEditorPane();
+        jPanel1 = new javax.swing.JPanel();
+        jScrollPane2 = new javax.swing.JScrollPane();
+        jTextArea1 = new javax.swing.JTextArea();
+        jPanel2 = new javax.swing.JPanel();
+        jButton1 = new javax.swing.JButton();
+
+        jSplitPane1.setDividerLocation(500);
+        jSplitPane1.setOrientation(javax.swing.JSplitPane.VERTICAL_SPLIT);
+        jEditorPane1.setContentType("text/html");
+        jPanel1.setLayout(new java.awt.BorderLayout());
+        jTextArea1.setColumns(20);
+        jTextArea1.setRows(5);
+        jTextArea1.addKeyListener(new java.awt.event.KeyAdapter() {
+            @Override
+            public void keyTyped(java.awt.event.KeyEvent evt) {
+                if (evt.getKeyChar() == '\n') {
+                    sendMessage();
+                }
+            }
+        });
+        jButton1.setText("Send");
+
+        jScrollPane1.setViewportView(jEditorPane1);
+        jScrollPane2.setViewportView(jTextArea1);
+        jSplitPane1.setTopComponent(jScrollPane1);
+
+        jPanel1.add(jScrollPane2, java.awt.BorderLayout.CENTER);
+        jPanel2.setLayout(new java.awt.FlowLayout(java.awt.FlowLayout.RIGHT));
+        jButton1.addActionListener((java.awt.event.ActionEvent evt) -> {
+            sendMessage();
+        });
+        jPanel2.add(jButton1);
+        jPanel1.add(jPanel2, java.awt.BorderLayout.PAGE_END);
+        jSplitPane1.setRightComponent(jPanel1);
+        getContentPane().add(jSplitPane1, java.awt.BorderLayout.CENTER);
+        pack();
+    }
+
+    private void sendMessage() {
+        if (jTextArea1.getText().trim().length() == 0) {
+            return;
+        }
+        mainWindow.sendChatMessage(jTextArea1.getText());
+        jTextArea1.setText("");
+    }
+
+    public void receiveChatMessage(String message) {
+        jEditorPane1.setText(message + jEditorPane1.getText());
+    }
+}

src/br/edu/ufsj/sms/GUI/Login.java

@@ -0,0 +1,102 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package br.edu.ufsj.sms.GUI;
+
+import java.awt.BorderLayout;
+import java.awt.FlowLayout;
+import java.awt.GridBagConstraints;
+import java.awt.GridBagLayout;
+import java.awt.Insets;
+import java.awt.event.ActionEvent;
+
+import javax.swing.JButton;
+import javax.swing.JDialog;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+import javax.swing.JSpinner;
+import javax.swing.JTextField;
+
+/**
+ *
+ * @author flavio
+ */
+public final class Login extends JDialog {
+
+    JLabel nameLabel = new JLabel("Name: ");
+    JLabel portLabel = new JLabel("Port: ");
+
+    JTextField nameField = new JTextField();
+    JSpinner portField = new JSpinner();
+
+    JButton okButton = new JButton("OK");
+    JButton cancelButton = new JButton("Cancel");
+
+    public Login() {
+        initComponents();
+        this.setSize(400, 150);
+        this.setModal(true);
+    }
+
+    public void initComponents() {
+        this.setTitle("Login");
+
+        portField.setModel(new javax.swing.SpinnerNumberModel(8000, 8000, 9000, 1));
+        nameField.setText(System.getProperty("user.name"));
+
+        JPanel topPanel = new JPanel(new GridBagLayout());
+        JPanel buttonPanel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
+
+        buttonPanel.add(okButton);
+        buttonPanel.add(cancelButton);
+
+        GridBagConstraints gbc = new GridBagConstraints();
+
+        gbc.insets = new Insets(4, 4, 4, 4);
+
+        gbc.gridx = 0;
+        gbc.gridy = 0;
+        gbc.weightx = 0;
+        topPanel.add(nameLabel, gbc);
+
+        gbc.gridx = 1;
+        gbc.gridy = 0;
+        gbc.fill = GridBagConstraints.HORIZONTAL;
+        gbc.weightx = 1;
+        topPanel.add(nameField, gbc);
+
+        gbc.gridx = 0;
+        gbc.gridy = 1;
+        gbc.fill = GridBagConstraints.NONE;
+        gbc.weightx = 0;
+        topPanel.add(portLabel, gbc);
+
+        gbc.fill = GridBagConstraints.HORIZONTAL;
+        gbc.gridx = 1;
+        gbc.gridy = 1;
+        gbc.weightx = 1;
+        topPanel.add(portField, gbc);
+
+        this.add(topPanel);
+        this.add(buttonPanel, BorderLayout.SOUTH);
+
+        okButton.addActionListener((ActionEvent e) -> {
+            Login.this.setVisible(false);
+        });
+
+        cancelButton.addActionListener((ActionEvent e) -> {
+            System.exit(0);
+        });
+    }
+
+    @Override
+    public String getName() {
+        return nameField.getText();
+    }
+
+    public int getPort() {
+        return ((Integer) portField.getValue());
+    }
+}

src/br/edu/ufsj/sms/GUI/MainWindow.java

@@ -0,0 +1,182 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package br.edu.ufsj.sms.GUI;
+
+import br.edu.ufsj.sms.control.AlarmClock;
+import br.edu.ufsj.sms.control.ImageTransformation;
+import br.edu.ufsj.sms.control.ScreenShot;
+import br.edu.ufsj.sms.net.ChatMessage;
+import br.edu.ufsj.sms.net.ScreenCastMessage;
+import br.edu.ufsj.sms.net.Socket;
+import java.awt.AWTException;
+import java.awt.image.BufferedImage;
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.net.UnknownHostException;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.Timer;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import javax.imageio.ImageIO;
+import javax.swing.ImageIcon;
+import javax.swing.JLabel;
+
+/**
+ *
+ * @author flavio
+ */
+public class MainWindow extends javax.swing.JFrame {
+
+    private javax.swing.JScrollPane jScrollPane1;
+    private javax.swing.JLabel status;
+    private javax.swing.JPanel statusPanel;
+    private javax.swing.JTabbedPane tabbedPane;
+    private ChatWindow chatWindow;
+
+    private Socket socket;
+    private AlarmClock alarmClock;
+    private Timer timer;
+    public final static int TIME = 1000;
+
+    private String name;
+    private int port;
+
+    private float compressRatio;
+
+    public MainWindow(String name, int port) throws UnknownHostException {
+        this.name = name;
+        this.port = port;
+        this.compressRatio = 0.5f;
+        this.initComponents();
+    }
+
+    private void initComponents() throws UnknownHostException {
+        this.setJMenuBar(new MenuBar(this));
+        this.setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
+        this.setTitle("Share My Sheet");
+
+        jScrollPane1 = new javax.swing.JScrollPane();
+        tabbedPane = new javax.swing.JTabbedPane();
+        statusPanel = new javax.swing.JPanel();
+        status = new javax.swing.JLabel();
+
+        jScrollPane1.setViewportView(tabbedPane);
+        statusPanel.setLayout(new java.awt.FlowLayout(java.awt.FlowLayout.RIGHT));
+        status.setText("Connected on port " + this.port + " name " + this.name);
+        statusPanel.add(status);
+
+        this.getContentPane().add(jScrollPane1, java.awt.BorderLayout.CENTER);
+        this.getContentPane().add(statusPanel, java.awt.BorderLayout.PAGE_END);
+
+        this.pack();
+
+        this.socket = new Socket(this);
+        this.timer = new Timer();
+        this.chatWindow = new ChatWindow(this);
+
+        this.socket.start();
+        this.setSize(new java.awt.Dimension(1024, 768));
+    }
+
+    public void showChatWindow() {
+        this.chatWindow.setVisible(true);
+    }
+
+    public void showAboutWindow() {
+
+    }
+
+    public void shareMySheet(boolean status) {
+        if (status) {
+            this.timer = new Timer();
+            this.alarmClock = new AlarmClock(this);
+            this.timer.scheduleAtFixedRate(this.alarmClock, 0, MainWindow.TIME);
+        } else {
+            this.timer.cancel();
+        }
+    }
+
+    public void closeCurrentTab() {
+        tabbedPane.remove(tabbedPane.getSelectedIndex());
+    }
+
+    public void exit() {
+        this.chatWindow.setVisible(true);
+        this.setVisible(false);
+        this.dispose();
+        System.exit(0);
+    }
+
+    public void sendChatMessage(String text) {
+        ChatMessage message = new ChatMessage(this.name, text);
+        try {
+            this.socket.send(message.toByteArray());
+        } catch (IOException ex) {
+            Logger.getLogger(MainWindow.class.getName()).log(Level.SEVERE, null, ex);
+        }
+    }
+
+    public void sendScreenCastMessage() {
+        byte[] msg = null;
+        try {
+            BufferedImage image = ScreenShot.takeAShot();
+            BufferedImage rescaled = ImageTransformation.resize(image, 1024, 768);
+            byte[] byteImage = ImageTransformation.compress(rescaled, compressRatio);
+            ScreenCastMessage message = new ScreenCastMessage(this.name, byteImage);
+            msg = message.toByteArray();
+        } catch (AWTException | IOException ex) {
+            Logger.getLogger(AlarmClock.class.getName()).log(Level.SEVERE, null, ex);
+        }
+        if (msg != null) {
+            try {
+                this.socket.send(msg);
+            } catch (IOException ex) {
+                Logger.getLogger(AlarmClock.class.getName()).log(Level.SEVERE, null, ex);
+                this.compressRatio -= 0.05f;
+            }
+        }
+    }
+
+    public void receiveScreenCastMessage(ScreenCastMessage message) {
+        ByteArrayInputStream bais = new ByteArrayInputStream(message.getImageByte());
+        BufferedImage image;
+        try {
+
+            image = ImageIO.read(bais);
+            ImageIcon imageIcon = new ImageIcon(image);
+
+            JLabel myShoot = new JLabel(imageIcon);
+
+            for (int i = 0; i < tabbedPane.getTabCount(); i++) {
+                String title = tabbedPane.getTitleAt(i);
+                if (title.equals(message.getName())) {
+                    tabbedPane.setComponentAt(i, myShoot);
+                    return;
+                }
+            }
+            tabbedPane.addTab(message.getName(), myShoot);
+        } catch (IOException ex) {
+            Logger.getLogger(MainWindow.class.getName()).log(Level.SEVERE, null, ex);
+        }
+    }
+
+    public void receiveChatMessage(ChatMessage message) {
+        SimpleDateFormat dt = new SimpleDateFormat("dd/MM/yyyyy hh:mm:ss");
+        Date date = new Date();
+        chatWindow.receiveChatMessage(dt.format(date) + " "
+                + "<b>" + message.getName() + "</b>: "
+                + message.getText() + "<br>");
+    }
+
+    /**
+     * @return the port
+     */
+    public int getPort() {
+        return port;
+    }
+
+}

src/br/edu/ufsj/sms/GUI/MenuBar.java

@@ -0,0 +1,100 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package br.edu.ufsj.sms.GUI;
+
+import javax.swing.JMenuBar;
+
+/**
+ *
+ * @author flavio
+ */
+public class MenuBar extends JMenuBar {
+
+    private javax.swing.JMenuItem aboutMenu;
+    private javax.swing.JMenuItem closeTabMenu;
+    private javax.swing.JMenu editMenu;
+    private javax.swing.JMenu fileMenu;
+    private javax.swing.JMenu helpMenu;
+
+    private javax.swing.JMenuItem exitMenu;
+    private javax.swing.JCheckBoxMenuItem shareMySheetMenu;
+    private javax.swing.JMenuItem showChatWindowMenu;
+    private javax.swing.JMenu viewMenu;
+
+    private final MainWindow mainWindow;
+
+    public MenuBar(MainWindow mainWindow) {
+        this.mainWindow = mainWindow;
+        this.initComponents();
+    }
+
+    private void initComponents() {
+        fileMenu = new javax.swing.JMenu();
+        closeTabMenu = new javax.swing.JMenuItem();
+        exitMenu = new javax.swing.JMenuItem();
+        editMenu = new javax.swing.JMenu();
+        shareMySheetMenu = new javax.swing.JCheckBoxMenuItem();
+        viewMenu = new javax.swing.JMenu();
+        showChatWindowMenu = new javax.swing.JMenuItem();
+        helpMenu = new javax.swing.JMenu();
+        aboutMenu = new javax.swing.JMenuItem();
+
+        fileMenu.setText("File");
+        closeTabMenu.setAccelerator(javax.swing.KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_W, java.awt.event.InputEvent.CTRL_MASK));
+        closeTabMenu.setText("Close Current Tab");
+        closeTabMenu.addActionListener(this::closeTabMenuActionPerformed);
+        exitMenu.setAccelerator(javax.swing.KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_F4, java.awt.event.InputEvent.ALT_MASK));
+        exitMenu.setText("Exit");
+        exitMenu.addActionListener(this::exitMenuActionPerformed);
+        fileMenu.add(closeTabMenu);
+        fileMenu.add(exitMenu);
+        this.add(fileMenu);
+
+        editMenu.setText("Edit");
+        shareMySheetMenu.setText("Share My Sheet!");
+        shareMySheetMenu.addActionListener(this::shareMySheetMenuActionPerformed);
+        editMenu.add(shareMySheetMenu);
+        this.add(editMenu);
+
+        viewMenu.setText("View");
+        showChatWindowMenu.setText("Chat Window");
+        showChatWindowMenu.addActionListener(this::showChatWindowMenuActionPerformed);
+        viewMenu.add(showChatWindowMenu);
+        this.add(viewMenu);
+
+        helpMenu.setText("Help");
+        aboutMenu.setText("About");
+        aboutMenu.addActionListener(this::aboutMenuActionPerformed);
+        helpMenu.add(aboutMenu);
+        this.add(helpMenu);
+    }
+
+    private void showChatWindowMenuActionPerformed(java.awt.event.ActionEvent evt) {
+        mainWindow.showChatWindow();
+    }
+
+    private void aboutMenuActionPerformed(java.awt.event.ActionEvent evt) {
+        mainWindow.showAboutWindow();
+    }
+
+    private void shareMySheetMenuActionPerformed(java.awt.event.ActionEvent evt) {
+        mainWindow.shareMySheet(shareMySheetMenu.isSelected());
+        if (shareMySheetMenu.isSelected()) {
+            shareMySheetMenu.setText("Stop sharing it!");
+        } else {
+            shareMySheetMenu.setText("Share My Sheer!");
+        }
+    }
+
+    private void closeTabMenuActionPerformed(java.awt.event.ActionEvent evt) {
+        mainWindow.closeCurrentTab();
+    }
+
+    private void exitMenuActionPerformed(java.awt.event.ActionEvent evt) {
+        mainWindow.exit();
+    }
+
+}

src/br/edu/ufsj/sms/Main.java

@@ -0,0 +1,66 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package br.edu.ufsj.sms;
+
+import br.edu.ufsj.sms.GUI.Login;
+import java.net.UnknownHostException;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ *
+ * @author flavio
+ */
+public class Main {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String args[]) {
+        /* Set the Nimbus look and feel */
+        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
+        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
+         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
+         */
+        try {
+            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
+                if ("Nimbus".equals(info.getName())) {
+                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
+                    break;
+                }
+            }
+        } catch (ClassNotFoundException ex) {
+            java.util.logging.Logger.getLogger(br.edu.ufsj.sms.GUI.MainWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
+        } catch (InstantiationException ex) {
+            java.util.logging.Logger.getLogger(br.edu.ufsj.sms.GUI.MainWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
+        } catch (IllegalAccessException ex) {
+            java.util.logging.Logger.getLogger(br.edu.ufsj.sms.GUI.MainWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
+        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
+            java.util.logging.Logger.getLogger(br.edu.ufsj.sms.GUI.MainWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
+        }
+        //</editor-fold>
+
+        /* Create and display the form */
+        java.awt.EventQueue.invokeLater(new Runnable() {
+            @Override
+            public void run() {
+                try {
+                    Login login = new Login();
+                    login.setVisible(true);
+                    String name = login.getName();
+                    int port = login.getPort();
+                    login.dispose();
+                    br.edu.ufsj.sms.GUI.MainWindow main;
+                    main = new br.edu.ufsj.sms.GUI.MainWindow(name, port);
+                    main.setVisible(true);
+                } catch (UnknownHostException ex) {
+                    Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
+                }
+            }
+        });
+    }
+
+}

src/br/edu/ufsj/sms/control/AlarmClock.java

@@ -0,0 +1,27 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package br.edu.ufsj.sms.control;
+
+import br.edu.ufsj.sms.GUI.MainWindow;
+import java.util.TimerTask;
+
+/**
+ *
+ * @author flavio
+ */
+public class AlarmClock extends TimerTask {
+
+    private final MainWindow mainWindow;
+    
+    public AlarmClock(MainWindow mainWindow) {
+        this.mainWindow = mainWindow;
+    }
+
+    @Override
+    public void run() {
+        this.mainWindow.sendScreenCastMessage();
+    }
+}

src/br/edu/ufsj/sms/control/ImageTransformation.java

@@ -0,0 +1,70 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package br.edu.ufsj.sms.control;
+
+import java.awt.Image;
+import java.awt.image.BufferedImage;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.util.Iterator;
+import javax.imageio.IIOImage;
+import javax.imageio.ImageIO;
+import javax.imageio.ImageWriteParam;
+import javax.imageio.ImageWriter;
+import javax.imageio.stream.ImageOutputStream;
+
+/**
+ *
+ * @author flavio
+ */
+public class ImageTransformation {
+
+    public static byte[] toByteArray(BufferedImage image) throws IOException {
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        ImageIO.write(image, "jpg", baos);
+        byte[] data = baos.toByteArray();
+        return data;
+    }
+
+    public static byte[] compress(BufferedImage image, float scale) throws IOException {
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName("jpg");
+        ImageWriter writer = writers.next();
+        ImageWriteParam param = writer.getDefaultWriteParam();
+        param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
+        param.setCompressionQuality(scale);
+        ImageOutputStream ios = ImageIO.createImageOutputStream(baos);
+        writer.setOutput(ios);
+        writer.write(null, new IIOImage(image, null, null), param);
+        byte[] data = baos.toByteArray();
+        writer.dispose();
+        return data;
+    }
+
+    public static BufferedImage resize(BufferedImage img, int maxWidth, int maxHeight) throws IOException {
+        int scaledWidth = 0;
+        int scaledHeight = 0;
+
+        scaledWidth = maxWidth;
+        scaledHeight = (int) (img.getHeight() * ((double) scaledWidth / img.getWidth()));
+
+        if (scaledHeight > maxHeight) {
+            scaledHeight = maxHeight;
+            scaledWidth = (int) (img.getWidth() * ((double) scaledHeight / img.getHeight()));
+
+            if (scaledWidth > maxWidth) {
+                scaledWidth = maxWidth;
+                scaledHeight = maxHeight;
+            }
+        }
+
+        Image resized = img.getScaledInstance(scaledWidth, scaledHeight, Image.SCALE_SMOOTH);
+        BufferedImage buffered = new BufferedImage(scaledWidth, scaledHeight, Image.SCALE_REPLICATE);
+        buffered.getGraphics().drawImage(resized, 0, 0, null);
+
+        return buffered;
+    }
+}

src/br/edu/ufsj/sms/control/ScreenShot.java

@@ -0,0 +1,27 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package br.edu.ufsj.sms.control;
+
+import java.awt.AWTException;
+import java.awt.Rectangle;
+import java.awt.Robot;
+import java.awt.Toolkit;
+import java.awt.image.BufferedImage;
+import java.io.IOException;
+
+/**
+ *
+ * @author flavio
+ */
+public class ScreenShot {
+
+    public static BufferedImage takeAShot() throws AWTException, IOException {
+        Robot robot = new Robot();
+        Rectangle screenRect = new Rectangle(Toolkit.getDefaultToolkit().getScreenSize());
+        BufferedImage output = robot.createScreenCapture(screenRect);
+        return output;
+    }
+}

src/br/edu/ufsj/sms/net/ChatMessage.java

@@ -0,0 +1,49 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package br.edu.ufsj.sms.net;
+
+/**
+ *
+ * @author flavio
+ */
+public class ChatMessage extends Message{
+
+    private String text;
+    private String name;
+
+    public ChatMessage(String name, String text){
+        this.name = name;
+        this.text = text;
+    }
+    /**
+     * @return the name
+     */
+    public String getName() {
+        return name;
+    }
+
+    /**
+     * @param name the name to set
+     */
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    /**
+     * @return the text
+     */
+    public String getText() {
+        return text;
+    }
+
+    /**
+     * @param text the text to set
+     */
+    public void setText(String text) {
+        this.text = text;
+    }
+
+}

src/br/edu/ufsj/sms/net/Message.java

@@ -0,0 +1,27 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package br.edu.ufsj.sms.net;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectOutput;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+
+/**
+ *
+ * @author flavio
+ */
+public abstract class Message implements Serializable{
+
+    public byte[] toByteArray() throws IOException {
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        ObjectOutput out = new ObjectOutputStream(baos);
+        out.writeObject(this);
+        out.flush();
+        return baos.toByteArray();
+    }
+}

src/br/edu/ufsj/sms/net/ScreenCastMessage.java

@@ -0,0 +1,53 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package br.edu.ufsj.sms.net;
+
+/**
+ *
+ * @author flavio
+ */
+public class ScreenCastMessage extends Message {
+
+    private String name;
+    private byte[] imageByte;
+
+    public ScreenCastMessage() {
+    }
+
+    public ScreenCastMessage(String name, byte[] imageByte) {
+        this.name = name;
+        this.imageByte = imageByte;
+    }
+
+    /**
+     * @return the name
+     */
+    public String getName() {
+        return name;
+    }
+
+    /**
+     * @param name the name to set
+     */
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    /**
+     * @return the imageByte
+     */
+    public byte[] getImageByte() {
+        return imageByte;
+    }
+
+    /**
+     * @param imageByte the image to set
+     */
+    public void setImageByte(byte[] imageByte) {
+        this.imageByte = imageByte;
+    }
+
+}

src/br/edu/ufsj/sms/net/Socket.java

@@ -0,0 +1,79 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package br.edu.ufsj.sms.net;
+
+import br.edu.ufsj.sms.GUI.MainWindow;
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.ObjectInput;
+import java.io.ObjectInputStream;
+import java.net.DatagramPacket;
+import java.net.InetAddress;
+import java.net.MulticastSocket;
+import java.net.UnknownHostException;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ *
+ * @author flavio
+ */
+public class Socket extends Thread {
+
+    private MulticastSocket multicastSocket;
+    private InetAddress address;
+    private MainWindow main;
+    public final static String INET_ADDR = "224.0.0.3";
+
+    public Socket(MainWindow main) throws UnknownHostException {
+        this.main = main;
+        this.address = InetAddress.getByName(Socket.INET_ADDR);
+        try {
+            multicastSocket = new MulticastSocket(this.main.getPort());
+            multicastSocket.setSendBufferSize(256000);
+            multicastSocket.setReceiveBufferSize(256000);
+            multicastSocket.setReuseAddress(true);
+            multicastSocket.joinGroup(address);
+        } catch (IOException ex) {
+            System.out.println("There is no socket connection. Sorry.");
+            System.out.println(ex.toString());
+        }
+    }
+
+    public void send(byte[] msg) throws IOException {
+        DatagramPacket msgPacket;
+            msgPacket = new DatagramPacket(msg, msg.length, this.address, this.main.getPort());
+            multicastSocket.send(msgPacket);
+    }
+
+    public void receive() throws UnknownHostException, IOException, ClassNotFoundException {
+        byte[] buf = new byte[256000];
+        while (true) {
+            // Receive the information and print it.
+            DatagramPacket msgPacket = new DatagramPacket(buf, buf.length);
+            multicastSocket.receive(msgPacket);
+            ByteArrayInputStream bis = new ByteArrayInputStream(msgPacket.getData());
+            ObjectInput in = new ObjectInputStream(bis);
+            Object message;
+            message = in.readObject();
+            if (message instanceof ScreenCastMessage) {
+                this.main.receiveScreenCastMessage((ScreenCastMessage) message);
+            }
+            if (message instanceof ChatMessage) {
+                this.main.receiveChatMessage((ChatMessage) message);
+            }
+        }
+    }
+
+    @Override
+    public void run() {
+        try {
+            this.receive();
+        } catch (IOException | ClassNotFoundException ex) {
+            Logger.getLogger(Socket.class.getName()).log(Level.SEVERE, null, ex);
+        }
+    }
+}