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1. Introduction to Freemarker
FreeMarker is a template engine, a general tool for generating textual output based on templates, written in pure Java. Generally the first impression of FreeMarker is to replace JSP, but unlike JSP, FreeMarker templates can be used outside the servlet container. You can use them to generate emails, configuration files, XML maps, and more. Or you can directly generate HTML files and other files, which are used as tools for automatic code generation.
Freemarker as a page template reference