Java – escape in FreeMarker by default

In the FreeMarker template, we can use the escape instruction to automatically apply escape to all interpolation in the included block:

<#escape x as x?html>
  <#-- name is escaped as html -->
  Hallo,${name}
</#escape>

Is there any way to achieve a similar effect programmatically by defining the Default Escape applied to all interpolation in the template, including interpolation other than escape instructions?

thank you.

Solution

Explain Attila's answer in detail: you can use a class like this one, and then wrap your template loader as follows:

final TemplateLoader templateLoader = new ClasstemplateLoader(this.getClass(),templatePath) {
  /**
   * Replaces the normal template reader with something that changes the default
   * escaping to HTML as to avoid XSS attacks.
   */
  @Override
  public Reader getReader(Object templateSource,String encoding) throws IOException {
     return new WrappingReader(super.getReader(templateSource,encoding),"<#escape x as x?html>","</#escape>");
  }
};

If you do not include line breaks in the added section, you will not get line number problems However, you cannot use < #ftl > / [#ftl]