I do this by rendering the HTML into a PDF, and then rasterizing the
PDF to an image.
I've tried using several implementations, but currently I use PD4ML
for the HTML rendering, and JPedal for rasterizing the PDF.
-------------- Step 1 -----------------
/**
* Uses PD4ML to generate a PDF-file from HTML.
*
* @param htmlString The HTML to work from.
* @param isLandscape
* @return Rendered PDF-data.
*/
public static NSData convertHTMLToPdf( String htmlString, boolean
isLandscape ) {
java.awt.Dimension format = PD4Constants.A4;
boolean landscapeValue = isLandscape;
int topValue = 10;
int leftValue = 10;
int rightValue = 10;
int bottomValue = 10;
String unitsValue = "mm";
// boolean patchValue = true;
boolean splitValue = true;
String proxyHost = "";
int proxyPort = 0;
int userSpaceWidth = 780;
ByteArrayOutputStream bos = new ByteArrayOutputStream();
try {
if( proxyHost != null && proxyHost.length() != 0 && proxyPort !=
0 ) {
System.getProperties().setProperty( "proxySet",
"true" );
System.getProperties().setProperty(
"proxyHost", proxyHost );
System.getProperties().setProperty( "proxyPort",
"" + proxyPort );
}
PD4ML pd4ml = new PD4ML();
if( landscapeValue ) {
format = pd4ml.changePageOrientation( format );
}
pd4ml.setPageSize( format );
if( unitsValue.equals( "mm" ) ) {
pd4ml.setPageInsetsMM( new java.awt.Insets( topValue, leftValue,
bottomValue, rightValue ) );
}
else {
pd4ml.setPageInsets( new java.awt.Insets( topValue, leftValue,
bottomValue, rightValue ) );
}
pd4ml.setHtmlWidth( userSpaceWidth );
pd4ml.enableImgSplit( splitValue );
pd4ml.render( new StringReader( htmlString ), bos );
}
catch( Exception e ) {
logger.error( "Could not convert HTML to PDF", e );
}
return new NSData( bos.toByteArray() );
}
-------------- Step 2 -----------------
/**
* Rasterizes PDF-data into JPEG-data, returning null if the
conversion is not successful.
*/
public static NSData convertPDFToJPEGData( NSData data ) {
try {
PdfDecoder decoder = new PdfDecoder();
decoder.setExtractionMode( 0, 72, 2.0f );
decoder.openPdfArray( data.bytes() );
decoder.decodePage( 1 );
BufferedImage image = decoder.getPageAsImage( 1 );
return
USImageUtilities.encodeImageToJPEGDataWithQuality( image, 1 );
}
catch( Exception e ) {
logger.error( "An esception occurred during rasterizing of PDF data
to JPEG", e );
return null;
}
}
-------------------------------
Cheers,
- hugi
On 30.3.2009, at 15:31, Kieran Kelleher wrote:
Anyone have any suggestions for free utility to make thumbnail (or
plain image that I can thumbnail) of a HTML page in java?
-Kieran
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