java - Render image dynamically -


i'm trying render image dynamic html layout. how can set width , height of image dynamically based on height , width of table inside html. mean how can find table width(x) , height(y) html?

    jlabel label = new jlabel(html);     label.setsize(x, y);     bufferedimage image = new bufferedimage(label.getwidth(),label.getheight(),bufferedimage.type_int_argb);     graphics2d g2d = (graphics2d)image.getgraphics();     g2d.setcolor(color.white);     g2d.setrenderinghint(renderinghints.key_text_antialiasing, renderinghints.value_text_antialias_on);     label.paint(g2d);     g2d.dispose();     bytearrayoutputstream baos = new bytearrayoutputstream();     try {         imageio.write(image, "png", baos);     } catch (ioexception e) {         e.printstacktrace();     }

below outline of html.

<html> <head>....</head> <body topmargin="0" leftmargin="0"><table border=0 cellpadding=0 cellspacing=0 width=700 style='border-collapse:collapse;table-layout:fixed;width:684pt'> ...... ...... </body></html>

the following code works. idea that, if don't put rendering jlabel inside container layoutmanager, need set size of jlabel yourself. appropriate size can found getpreferredsize(). should done exclusively in situation. in other cases, should not call setsize() , should leave layoutmanager.

the result image:

enter image description here

import java.awt.color; import java.awt.desktop; import java.awt.graphics2d; import java.awt.renderinghints; import java.awt.image.bufferedimage; import java.io.file; import java.io.fileoutputstream; import java.io.ioexception;  import javax.imageio.imageio; import javax.swing.jlabel; import javax.swing.swingutilities;  class testpaint {      protected void initui() {         stringbuilder sb = new stringbuilder("<html>");         sb.append("<table>");         (int = 0; < 5; i++) {             sb.append("<tr>");             (int j = 0; j < 5; j++) {                 sb.append("<td>");                 sb.append("cell ").append(i + 1).append(' ').append(j + 1);                 sb.append("</td>");             }             sb.append("</tr>");         }         sb.append("</table>");         jlabel label = new jlabel(sb.tostring());         label.setsize(label.getpreferredsize());         bufferedimage image = new bufferedimage(label.getwidth(), label.getheight(), bufferedimage.type_int_argb);         graphics2d g2d = (graphics2d) image.getgraphics();         g2d.setcolor(color.white);         g2d.setrenderinghint(renderinghints.key_text_antialiasing, renderinghints.value_text_antialias_on);         label.paint(g2d);         g2d.dispose();         file file = new file("/tmp/test.png");         if (!file.getparentfile().exists()) {             file.getparentfile().mkdirs();         }         fileoutputstream baos = null;         try {             baos = new fileoutputstream(file);             imageio.write(image, "png", baos);           desktop.getdesktop().open(file);         } catch (ioexception e) {             e.printstacktrace();         } {             if (baos != null) {                 try {                     baos.close();                 } catch (ioexception e) {                     e.printstacktrace();                 }             }         }      }      public static void main(string[] args) {         swingutilities.invokelater(new runnable() {             @override             public void run() {                 new testpaint().initui();             }          });     } }

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