I want to give a button in my JSP page, which on click of it should store an image in the filesystem.
Following is the code ScreenCapture.java which is a servlet.
Purpose: To capture the screen of working area and store it in file system.
Problem: - An image file is stored in file system with blank image.
Please help me to fix what is wrong
.
import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
*
* @author RAKESH
*/
public class ScreenCapture extends HttpServlet {
/**
* Processes requests for both HTTP
* <code>GET</code> and
* <code>POST</code> methods.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
String inf = "c:\\new1", fileType = "JPG", fileName = null;
fileName = inf + "." + fileType;
try {
try {
Robot robot = new Robot();
BufferedImage screenShot = robot.createScreenCapture(new Rectangle(Toolkit.getDefaultToolkit().getScreenSize()));
ImageIO.write(screenShot, fileType, new File(fileName));
//captureScreen(fileName);
} catch (Exception ex) {
Logger.getLogger(ScreenCapture.class.getName()).log(Level.SEVERE, null, ex);
}
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet ScreenCapture</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Servlet ScreenCapture at " + request.getContextPath() + "</h1>");
out.println("<h2>ScreenCapture stored at " + fileName + "</h2>");
out.println("</body>");
out.println("</html>");
} finally {
out.close();
}
}
public void captureScreen(String fileName) throws Exception {
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
Rectangle screenRectangle = new Rectangle(screenSize);
Robot robot = new Robot();
BufferedImage image = robot.createScreenCapture(screenRectangle);
ImageIO.write(image, "png", new File(fileName));
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP
* <code>GET</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Handles the HTTP
* <code>POST</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Returns a short description of the servlet.
*
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}
If you observe captureScreen method is working well if you execute separately as a java file (non-servlet)
only with servlet this is not working.
