Java WkHtmlToPdf Wrapper

A Java based wrapper for the wkhtmltopdf command line tool. As the name implies, it uses WebKit to convert HTML documents to PDFs.

Requirements

wkhtmltopdf must be installed and working on your system.

Wrapper project dependency

Make sure you have Java Wrapper dependency added to your project.

If you are using Gradle/Maven, see example below:

Gradle

In your build.gradle:

dependencies {
    compile 'com.github.jhonnymertz:java-wkhtmltopdf-wrapper:1.1.15-RELEASE'
}

Maven

In your pom.xml:

<dependency>
    <groupId>com.github.jhonnymertz</groupId>
    <artifactId>java-wkhtmltopdf-wrapper</artifactId>
    <version>1.1.15-RELEASE</version>
</dependency>

Usage and Examples

// Attempt to find the wkhtmltopdf command from OS path
String executable = WrapperConfig.findExecutable();

// Initialize with the command wrapper
// Customize the OS command to be called if needed
Pdf pdf = new Pdf(new WrapperConfig(executable));

pdf.addPageFromString("<html><head><meta charset=\"utf-8\"></head><h1>Müller</h1></html>");
pdf.addPageFromUrl("http://www.google.com");

// Add a Table of Contents
pdf.addToc();

// The `wkhtmltopdf` shell command accepts different types of options such as global, page, headers and footers, and toc. Please see `wkhtmltopdf -H` for a full explanation.
// All options are passed as array, for example:
pdf.addParam(new Param("--no-footer-line"), new Param("--header-html", "file:///header.html"));
pdf.addParam(new Param("--enable-javascript"));
pdf.addParam(new Param("--javascript-delay", "2000"));

// Add styling for Table of Contents
pdf.addTocParam(new Param("--xsl-style-sheet", "my_toc.xsl"));

// Save the PDF
pdf.saveAs("output.pdf");

Xvfb Support

XvfbConfig xc = new XvfbConfig();
xc.addParams(new Param("--auto-servernum"), new Param("--server-num=1"));

WrapperConfig wc = new WrapperConfig();
wc.setXvfbConfig(xc);

Pdf pdf = new Pdf(wc);
pdf.addPageFromUrl("http://www.google.com");

pdf.saveAs("output.pdf");

wkhtmltopdf exit codes

wkhtmltopdf may return non-zero exit codes to denote warnings, you can now set the Pdf object to allow this:

Pdf pdf = new Pdf();
pdf.addPageFromUrl("http://www.google.com");

pdf.setAllowMissingAssets();
// or:  
pdf.setSuccessValues(Arrays.asList(0, 1));

pdf.saveAs("output.pdf");

Cleaning up temporary files

After the PDF generation, the library automatically cleans up the temporary files created. However, there may be situations in which the Pdf object is created but no PDF is generated. To avoid increasing the temp folder size and having problems, you can force the deletion of all temporary files created by the library by:

Pdf pdf = new Pdf();
pdf.cleanAllTempFiles();

This is not an official Wkhtmltopdf product

This library is not an official Wkhtmltopdf product. Support is available on a best-effort basis via github issue tracking. Pull requests are welcomed.

Bugs

Tests are incomplete

Known issues

Output of wkhtmltopdf is being added to resulting pdf (Issue #19)

Starting from 1.1.10-RELEASE version, there is a method saveAsDirect(String path), which executes wkhtmltopdf passing the path as output for wkhtmltopdf, instead of the standard input -. This saves the results directly to the specified file path.

Because this library relies on wkhtmltopdf, it does not support concurrent PDF generations.

License

This project is available under MIT Licence.

jhonnymertz/java-wkhtmltopdf-wrapper

jhonnymertz

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