如何使用飞碟将大表格转换为 PDF？

Question

I have a html with large number of columns(you can find the sample at this link )

Now When I try to convert it to PDF using flying saucer ( jar link recompiled to work with iText 2.1.X), the generated PDF has truncated Columns

Is there some way to make Flying saucer to either break the table or to increase the width of the page according to the html content?

This is the code that I am using

String doc = file.toURI().toURL().toString();
ITextRenderer renderer = new ITextRenderer();
renderer.setDocument(doc);
String outputFile = "test.pdf";
OutputStream os = new FileOutputStream(outputFile);
renderer.layout();
renderer.createPDF(os);
os.flush();
os.close();

Where file is the html which I am trying to convert.

Answer 1

Use YAHP library.This is the best library I have worked so far to convert HTML to PDF. This is written on the top of flying saucer which is a big disappointment as compared to it's popularity.It won't even render simple input text boxes.So, I turned to YAHP library which is excellent for your case.

try this code after you get all the jars related to this library.

import java.io.File;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.allcolor.yahp.converter.CYaHPConverter;
import org.allcolor.yahp.converter.IHtmlToPdfTransformer;
import org.htmlcleaner.CleanerProperties;
import org.htmlcleaner.HtmlCleaner;
import org.htmlcleaner.PrettyHtmlSerializer;
import org.htmlcleaner.TagNode;

public class YahpHtmlToPdf {

    @SuppressWarnings({ "unchecked", "rawtypes" })
    public static void main(String[] args) {
        try{
            CleanerProperties props = new CleanerProperties();
            props.setTranslateSpecialEntities(true);
            props.setTransResCharsToNCR(true);
            props.setOmitComments(true);
            TagNode tagNode = new HtmlCleaner(props).clean(new File("C:\\Users\\MyComputer\\Desktop\\aspose.html"));
            String newString=new PrettyHtmlSerializer(props).getAsString(tagNode, "ISO-8859-1");
            CYaHPConverter converter = new CYaHPConverter();
            File fout = new File("C:\\sample\\aspose.pdf");
            FileOutputStream out = new FileOutputStream(fout);
            Map properties = new HashMap();
            List headerFooterList = new ArrayList();
            properties.put(IHtmlToPdfTransformer.PDF_RENDERER_CLASS,IHtmlToPdfTransformer.FLYINGSAUCER_PDF_RENDERER);
            converter.convertToPdf(newString,IHtmlToPdfTransformer.A1P,headerFooterList, "file:///temp/",out,properties);
            out.flush();
            out.close();
        }catch(Exception e){
            e.printStackTrace();
        }
    }   

}

This is screenshot of pdf generated with your html. .You can specify page size like this IHtmlToPdfTransformer.A1P .

Answer 2

Its possible to change the pagesize if you know the size you need.

Use the @page rule for this:
Please note: in this example im working on html with Jsoup (see comment).

/*
 * This part is optional - Jsoup is used for cleaning the html and inserting the style tag into the head.
 * You can use everything else for doing this.
 * 
 * If you will use Jsoup, make shure you set proper charset (2nd parameter).
 * 
 * Note: this is NOT a W3C Document but a Jsoup one.
 */
Document doc = Jsoup.parse(file, null);

/*
 * Here you specify the pagesize you need (size: with height).
 * Inserting this html is the key part!
 */
doc.head().append("<style type=\"text/css\"><!--@page { size:50.0cm 20.0cm; }--></style>");


ITextRenderer renderer = new ITextRenderer();

/*
 * This part ist jsoup related. 'doc.toString()' does nothing else than
 * returning the Html of 'doc' as a string.
 * 
 * You can set it like in your code too.
 */
renderer.setDocumentFromString(doc.toString());

final String outputFile = "test.pdf";
OutputStream os = new FileOutputStream(outputFile);
renderer.layout();
renderer.createPDF(os);
os.flush();
os.close();

With this code you'll get a Pdf where the whole table is on a landscape page (maybe you have to change width / height for your needs.