[stringtemplate-interest] Generating JSON using StringTemplate

[p_machner at poczta.fm]

Hello,
In my application I'm generating Json using StringTemplate. So, for example, I might have a template that looks like so:
{
    firstName: '$user.firstName$',
    lastName: '$user.lastName$'
}
To this template I can pass the Java user object like so: 

User user = //....
template.add("user", user);

Now, this is all nice, but when i.e. the lastname contains an apostrophe (like O'Donovan), my JSON breaks.
What can I do to automatically escape quote signs and apostrophes?
I tried using the following renderer: 

stringTemplateGroup.registerRenderer(String.class, new AttributeRenderer() {

            @Override
            public String toString(Object o, String formatString, Locale locale) {
                String result = (String) o;
                result = result.replace("\"", "\\\"");
                result = result.replace("'", "\'");

                return result;
            }
        });

but this got run on the whole template, not just the parameters that I passed to the template (the User object).
Eventually I got something like this:

{
    firstName: \'John\',
    lastName: \'O\'Donovan\'
}
which of course is not valid json.
Any ideas on how this escaping can be easily achieved?

Thanks and best regards,
Peter

----------------------------------------------------------------
Najwieksza gielda samochodowa!
http://linkint.pl/f2a7d