The heart of this library is apache-poi
Thanks to templ4docx
you can read the entire content (as simple String) of docx file, you can find all variables, register variables pattern and you can fill docx template file by your own map of variables.
The recommended way to get started using templ4docx in your project is a dependency management system โ the snippet below can be copied and pasted into your build.
<dependency>
<groupId>pl.jsolve</groupId>
<artifactId>templ4docx</artifactId>
<version>2.0.2</version>
</dependency>
Docx docx = new Docx("template.docx");
docx.setVariablePattern(new VariablePattern("#{", "}"));
// preparing variables
Variables variables = new Variables();
variables.addTextVariable(new TextVariable("#{firstname}", "Lukasz"));
variables.addTextVariable(new TextVariable("#{lastname}", "Stypka"));
// fill template
docx.fillTemplate(variables);
// save filled .docx file
docx.save("lstypka.docx");
More details: