Generate Image by Servlet

Question

This is my first servlet to generate and display image to the client,

But There is compile time error in the mentioned section by commect.

public class DynamicImage extends HttpServlet {

@Override
public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {

    response.setContentType("image/jpeg");

    //create image
    int width = 200;
    int height = 30;
    BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

    //get drawing context
    Graphics2D g = (Graphics2D) image.getGraphics();
    g.setColor(Color.GRAY);
    g.fillRect(0, 0, width, height);

    //draw a string
    g.setColor(Color.WHITE);
    g.setFont(new Font("Dialog", Font.PLAIN, 14));
    g.drawString("My String!", 10, height / 2 + 4);

    //draw a border
    g.setColor(Color.BLACK);
    g.drawRect(0, 0, width - 1, height - 1);

    //dispose context
    g.dispose();

    //send back image to the client
    ServletOutputStream sos = response.getOutputStream();
    com.sun.image.codec.jpeg.JPEGImageEncoder encoder = JPEGCodec // Compile Time Error, cant find JPEGCodec

    }
}

My IDE (Netbeans) cant find and import JPEGCodec , What is the solution?

classes from the com.sun package are not documented, and not supposed to be used. Use a public API that can write images in JPEG, like ImageIO. — JB Nizet, Nov 25 '14 at 18:19
Highly advise against generating images in servlets. The image should already exist on the file system or in a database; not only is it inefficient to do this in the servlet, but some servers do not have graphics cards or a GraphicsEnvironment, so your graphics operations may fail. — ControlAltDel, Nov 25 '14 at 18:25
@ControlAltDel I can think of quite a few use cases for generating images server side. Producing images server-side isn't unusual at all. To handle not have a graphics system just set the property for headless mode: -Djava.awt.headless=true — Michael, Nov 25 '14 at 20:09

score 0 · Answer 1 · edited May 23 '17 at 11:43

0

Take a look at this answer

I would recommend not to use this class. It's nothing but headache.

edited May 23 '17 at 11:43

Community

1
1

answered Nov 25 '14 at 18:30

deepakborania

166
2
8

score 0 · Accepted Answer · answered Nov 25 '14 at 19:39

0

You are needed to download rt.jar file and add it in your class path.
Download it from here.
If above link does not work visit here

answered Nov 25 '14 at 19:39

afzalex

8,598
2
34
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Generate Image by Servlet

2 Answers2