Signature Capturing Applet

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Signature Capturing Applet

3
Sep,2016

0
  Java

Hello friends, those who are looking for a Signature Capturing Applet with complete source code including Applet class and Servlet class, Check it out…

Applet Class:

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 //SignatureApp.java
 
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import javax.imageio.ImageIO;
import java.applet.Applet;
 
/**
 *@author: Tapas Jena
 *@mail: tapas.friends@gmail.com
 */
public class SignatureApp extends Applet implements MouseMotionListener ,MouseListener{
 
    int width;
    int height;
    Image img;
    Graphics graph;
    int lock = 0;
    Point p;
 
    public void init() {
 
        width = getSize().width;
        height = getSize().height;
        img = createImage(width, height);
        graph = img.getGraphics();
        graph.setColor(Color.BLUE);
 
        addMouseListener(this);
        addMouseMotionListener(this);
    }
 
    @Override
    public void mouseDragged(MouseEvent e) {
 
        if (lock == 1) {
            return;
        }
        int x = e.getX();
        int y = e.getY();
        graph.setColor(Color.BLUE);
        graph.drawLine(p.x,p.y,x, y);
        p=e.getPoint();    
        repaint();
    }
 
    @Override
    public void mouseMoved(MouseEvent e) {
 
    }
 
    @Override
    public void paint(Graphics g) {
        update(g);
    }
 
    @Override
    public void update(Graphics g) {
        g.drawImage(img, 0, 0,this);
    }
 
    //This Method save the signeture to a file in to server as an image(png)
    public void sign() {
        BufferedImage bufferedImage = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);
        bufferedImage.createGraphics().drawImage(img, 0, 0, this);
        try {
            ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
            ImageIO.write(bufferedImage, "png", byteStream);
            byte[] buf = byteStream.toByteArray();
            URL url = new URL("http://localhost:8080/SignApp/UploadPhoto");
            HttpURLConnection con = (HttpURLConnection) url.openConnection();
            con.setDoInput(true);
            con.setDoOutput(true);
            con.setUseCaches(false);
            con.setChunkedStreamingMode(1000);
            con.setRequestProperty("Content-Type", "application/octet-stream");
            con.setRequestMethod("POST");
            OutputStream os = con.getOutputStream();
            os.write(buf);
            System.out.println("Saved");
            os.flush();
            os.close();
        } catch (IOException e1) {
            System.out.println("Error during sending file to server");
            e1.printStackTrace();
        }
    }
 
    public void lock() {
        lock = 1;
    }
 
    public void unlock() {
        lock = 0;
    }
 
    public void clear() {
        graph.setColor(Color.white);
        graph.fillRect(0, 0, width, height);
        graph.setColor(Color.black);
        repaint();
    }
 
    @Override
    public void mouseClicked(MouseEvent e) {
        if (lock == 1) {
            return;
        }
        int x = e.getX();
        int y = e.getY();
        graph.fillOval(x, y, 3, 3);
        repaint();
    }
 
    @Override
    public void mouseEntered(MouseEvent e) {
 
    }
 
    @Override
    public void mouseExited(MouseEvent e) {
 
    }
 
    @Override
    public void mousePressed(MouseEvent e) {
        p=e.getPoint();
    }
 
    @Override
    public void mouseReleased(MouseEvent e) {
 
    }
}

Servlet Class:

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 //UploadPhoto.java
 
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
 
/**
 *@author: Tapas Jena
 *@mail: tapas.friends@gmail.com
 */
public class UploadPhoto extends HttpServlet {
 
     public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
 
         ServletContext sc = this.getServletContext();
 
         try {
              String path = sc.getRealPath(File.separator)+"Images/image.png";
 
              File yourFile = new File(path);
              FileOutputStream toFile = new FileOutputStream( yourFile );
              BufferedInputStream fromClient = new BufferedInputStream( req.getInputStream() );
 
              int c;
              while( (c = fromClient.read()) != -1) {
                  toFile.write(c);
                  System.out.println("Image Uploading");
              }
 
              System.out.println("Upload Completed....");
              toFile.flush();
              toFile.close();
              fromClient.close();  
          } catch (Exception e) {
              System.err.println("Error occoured at serverside during upload");
              e.printStackTrace();
          }
    }
 
    public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException, ServletException {
 
         doPost(request, response);  
    }
}
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