main/java/ImageServlet.java



import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.font.LineMetrics;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
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;


// Image scaling :http://helpdesk.objects.com.au/java/how-do-i-scale-a-bufferedimage 
public class ImageServlet extends HttpServlet {
        private static final long serialVersionUID = 1L;
        
        Logger logger = Logger.getLogger(ImageServlet.class.getName());
       
        protected Font loadFont() throws  IOException {
                File fontFile= new File( getServletContext().getRealPath("/Comic_Sans_MS.ttf") );
                logger.info( "Font:" + fontFile.getAbsolutePath() );

                Font font = null;
                try {
                        font = Font.createFont(Font.TRUETYPE_FONT, fontFile);
                } catch (Exception ex) {
                        logger.log(Level.SEVERE, "Font load failed", ex);
                }
                
                
                return font.deriveFont(48.0f);
        }

        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
                
                final int width = 400;
                final int height = 400;
                BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
                
                Graphics2D gfx = bufferedImage.createGraphics();
                gfx.setColor( Color.white ); 
                gfx.fillRect(0, 0, width, height); //Graphics2D has many various drawing methods
                gfx.setColor( Color.blue );
                gfx.fillOval(10, 10, width-20, height-20);
                gfx.setColor( Color.black );
                
                /////////////////////
                ///Text draw section
                String text = "Text to draw";
                Font f = loadFont();
                gfx.setFont( f );               
                Rectangle2D bounds = f.getStringBounds(text, gfx.getFontRenderContext());
                int textX = (int) (width-bounds.getWidth())/2;
                
                
                logger.info("bWidth=" + bounds.getWidth() + ", bHeight=" + bounds.getHeight());
                
                
                gfx.drawString(text, textX, 210);//note that the Y denotes the text's baseline !
                
                
                gfx.dispose(); //dispose when we are done with drawing
                
                
                //Downscale image to create a smoother looking one
                BufferedImage smallImage = new BufferedImage(width/2, height/2, BufferedImage.TYPE_INT_RGB);
                gfx = smallImage.createGraphics();
                gfx.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
                gfx.drawImage(bufferedImage, 0, 0, width/2, height/2, null);
                gfx.dispose();
                
                response.setHeader("Cache-Control", "no-cache");
                response.setDateHeader("Expires", 0);
                response.setContentType("image/png");
                ImageIO.write(smallImage, "png", response.getOutputStream() ); // use imageio.read to load a file to a bufferedimage
                
        }

}
1
2
3	import java.awt.Color;
4	import java.awt.Font;
5	import java.awt.Graphics2D;
6	import java.awt.RenderingHints;
7	import java.awt.font.LineMetrics;
8	import java.awt.geom.Rectangle2D;
9	import java.awt.image.BufferedImage;
10	import java.io.File;
11	import java.io.IOException;
12	import java.util.logging.Level;
13	import java.util.logging.Logger;
14
15	import javax.imageio.ImageIO;
16	import javax.servlet.ServletException;
17	import javax.servlet.http.HttpServlet;
18	import javax.servlet.http.HttpServletRequest;
19	import javax.servlet.http.HttpServletResponse;
20
21
22
23	// Image scaling :http://helpdesk.objects.com.au/java/how-do-i-scale-a-bufferedimage
24	public class ImageServlet extends HttpServlet {
25	private static final long serialVersionUID = 1L;
26
27	Logger logger = Logger.getLogger(ImageServlet.class.getName());
28
29	protected Font loadFont() throws IOException {
30	File fontFile= new File( getServletContext().getRealPath("/Comic_Sans_MS.ttf") );
31	logger.info( "Font:" + fontFile.getAbsolutePath() );
32
33	Font font = null;
34	try {
35	font = Font.createFont(Font.TRUETYPE_FONT, fontFile);
36	} catch (Exception ex) {
37	logger.log(Level.SEVERE, "Font load failed", ex);
38	}
39
40
41	return font.deriveFont(48.0f);
42	}
43
44	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
45
46	final int width = 400;
47	final int height = 400;
48	BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
49
50	Graphics2D gfx = bufferedImage.createGraphics();
51	gfx.setColor( Color.white );
52	gfx.fillRect(0, 0, width, height); //Graphics2D has many various drawing methods
53	gfx.setColor( Color.blue );
54	gfx.fillOval(10, 10, width-20, height-20);
55	gfx.setColor( Color.black );
56
57	/////////////////////
58	///Text draw section
59	String text = "Text to draw";
60	Font f = loadFont();
61	gfx.setFont( f );
62	Rectangle2D bounds = f.getStringBounds(text, gfx.getFontRenderContext());
63	int textX = (int) (width-bounds.getWidth())/2;
64
65
66	logger.info("bWidth=" + bounds.getWidth() + ", bHeight=" + bounds.getHeight());
67
68
69	gfx.drawString(text, textX, 210);//note that the Y denotes the text's baseline !
70
71
72
73	gfx.dispose(); //dispose when we are done with drawing
74
75
76	//Downscale image to create a smoother looking one
77	BufferedImage smallImage = new BufferedImage(width/2, height/2, BufferedImage.TYPE_INT_RGB);
78	gfx = smallImage.createGraphics();
79	gfx.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
80	gfx.drawImage(bufferedImage, 0, 0, width/2, height/2, null);
81	gfx.dispose();
82
83	response.setHeader("Cache-Control", "no-cache");
84	response.setDateHeader("Expires", 0);
85	response.setContentType("image/png");
86	ImageIO.write(smallImage, "png", response.getOutputStream() ); // use imageio.read to load a file to a bufferedimage
87
88	}
89
90	}