


How Can iText 7 and pdfHTML Solve HTML to PDF Conversion Problems with CSS Positioning?
Converting HTML to PDF using iText
Problem: CSS positioning not respected
Many developers encounter difficulties converting HTML to PDF using iText, particularly regarding the placement of elements using CSS.
HTMLWorker's Limitations
HTMLWorker, a deprecated component of iText, has significant drawbacks:
- CSS support: It doesn't support real CSS and requires explicit style definition in code.
- Deprecated: Many classes and methods used in HTMLWorker have become outdated.
XMLWorker's Challenges
XMLWorker, intended as a generic XML parsing framework, faced similar issues:
- Missing image: Images were missing without an ImageProvider; even then, CSS attributes like float were ignored.
- Partial CSS support: Positioning-related CSS styles weren't fully supported.
Solution with iText 7 and pdfHTML
To resolve these shortcomings, iText 7 and its pdfHTML add-on were developed. They offer a simplified approach:
public static final String SRC = "src/main/resources/html/sample.html"; public static final String DEST = "target/results/sample.pdf"; public void createPdf(String src, String dest) throws IOException { HtmlConverter.convertToPdf(new File(src), new File(dest)); }
This code generates the desired PDF output with CSS attributes like float being respected.
Additional Considerations
- Licensing: iText 7 is released under the AGPL, allowing free use in open source projects, but commercial licenses are required for closed source applications.
- Legacy systems: Migrating from older iText versions to iText 7 can be beneficial for code simplicity and future-proofing.
- Beginner's guide: For those new to iText 7, it's recommended to discard existing code and start anew, simplifying the conversion process.
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