Java Web snapshot-code for converting a webpage to an image

I personally think that the free java implementation method is the most convenient way to generate Web snapshots. Snapshots of large webpages can be generated. Great! Import the jar package before using the code. Three jar packages: swt-3.6M3-win32-win32-x86.jar, DJNativeSwing-SWT.jar, DJNativeSwing. jar

The Code is as follows:

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Running Environment: jdk1.6 or above Import java. awt. BorderLayout; Import java. awt. Dimension; Import java. awt. FlowLayout; Import java. awt. image. BufferedImage; Import java. io. File; Import java. io. IOException; Import javax. imageio. ImageIO; Import javax. swing. JFrame; Import javax. swing. JPanel; Import javax. swing. SwingUtilities; Import chrriis. dj. nativeswing. swtimpl. NativeComponent; Import chrriis. dj. nativeswing. swtimpl. NativeInterface; Import chrriis. dj. nativeswing. swtimpl. components. JWebBrowser; Import chrriis. dj. nativeswing. swtimpl. components. WebBrowserAdapter; Import chrriis. dj. nativeswing. swtimpl. components. WebBrowserEvent; Public class Main extends JPanel { /** * */ Private static final long serialVersionUID = 1L; // Line Separator Final static public String LS = System. getProperty ("line. separator", "n "); // File delimiter Final static public String FS = System. getProperty ("file. separator ","\"); // Use a javascript script to obtain the page size after full screen Final static StringBuffer jsDimension;   Static { JsDimension = new StringBuffer (); JsDimension. append ("var width = 0;"). append (LS ); JsDimension. append ("var height = 0;"). append (LS ); JsDimension. append ("if(document.doc umentElement) {"). append (LS ); JsDimension. append ( "Width = Math. max (width, document.doc umentElement. scrollWidth );") . Append (LS ); JsDimension. append ( "Height = Math. max (height, document.doc umentElement. scrollHeight );") . Append (LS ); JsDimension. append ("}"). append (LS ); JsDimension. append ("if (self. innerWidth) {"). append (LS ); JsDimension. append ("width = Math. max (width, self. innerWidth );") . Append (LS ); JsDimension. append ("height = Math. max (height, self. innerHeight );") . Append (LS ); JsDimension. append ("}"). append (LS ); JsDimension. append ("if (document. body. scrollWidth) {"). append (LS ); JsDimension. append ( "Width = Math. max (width, document. body. scrollWidth );") . Append (LS ); JsDimension. append ( "Height = Math. max (height, document. body. scrollHeight );") . Append (LS ); JsDimension. append ("}"). append (LS ); JsDimension. append ("return width + ':' + height ;"); } Public Main (final String url, final int maxWidth, final int maxHeight ){ Super (new BorderLayout ()); JPanel webBrowserPanel = new JPanel (new BorderLayout ()); Final String fileName = System. currentTimeMillis () + ". jpg "; Final JWebBrowser webBrowser = new JWebBrowser (null ); WebBrowser. setBarsVisible (false ); WebBrowser. navigate (url ); WebBrowserPanel. add (webBrowser, BorderLayout. CENTER ); Add (webBrowserPanel, BorderLayout. CENTER ); JPanel panel = new JPanel (new FlowLayout (FlowLayout. CENTER, 4, 4 )); WebBrowser. addWebBrowserListener (new WebBrowserAdapter (){ // Listen on the loading progress Public void loadingProgressChanged (WebBrowserEvent e ){ // When loading is complete If (e. getWebBrowser (). getLoadingProgress () = 100 ){ String result = (String) webBrowser . ExecuteJavascriptWithResult (jsDimension. toString ()); Int index = result = null? -1: result. indexOf (":"); NativeComponent nativeComponent = webBrowser . GetNativeComponent (); Dimension originalSize = nativeComponent. getSize (); Dimension imageSize = new Dimension (Integer. parseInt (result . Substring (0, index), Integer. parseInt (result . Substring (index + 1 ))); ImageSize. width = Math. max (originalSize. width, ImageSize. width + 50 ); ImageSize. height = Math. max (originalSize. height, ImageSize. height + 50 ); NativeComponent. setSize (imageSize ); BufferedImage image = new BufferedImage (imageSize. width, ImageSize. height, BufferedImage. TYPE_INT_RGB ); NativeComponent. paintComponent (image ); NativeComponent. setSize (originalSize ); // When the webpage exceeds the target size If (imageSize. width> maxWidth | ImageSize. height> maxHeight ){ // Some images Image = image. getSubimage (0, 0, maxWidth, maxHeight ); /* Use a thumbnail. Int width = image. getWidth (), height = image . GetHeight (); AffineTransform tx = new AffineTransform (); Tx. scale (double) maxWidth/width, (double) maxHeight /Height ); AffineTransformOp op = new AffineTransformOp (tx, AffineTransformOp. TYPE_NEAREST_NEIGHBOR ); // Zoom out Image = op. filter (image, null );*/ } Try { // Output image ImageIO. write (image, "jpg", new File (fileName )); } Catch (IOException ex ){ Ex. printStackTrace (); } // Exit the operation System. exit (0 ); } } } ); Add (panel, BorderLayout. SOUTH ); } Public static void main (String [] args ){ NativeInterface. open (); SwingUtilities. invokeLater (new Runnable (){ Public void run (){ // Switch the SWT component to the Swing component. webBrowser cannot be started if the parent form is not initialized. JFrame frame = new JFrame ("Save specified webpage with DJ component "); // Load google and save it as a maximum of 640xx Frame. getContentPane (). add ( New Main (http://yijianfengvip.blog.163.com/, 640,480 ), BorderLayout. CENTER ); Frame. setSize (800,600 ); // Only initialize but not display Frame. invalidate (); Frame. pack (); Frame. setVisible (false ); } }); NativeInterface. runEventPump (); } }