We have been considering this also not too long ago.
It is possible to include a JSP using a custom HttpServletResponse so
your app server's engine is used and there are standalone JSP engines
but both these solutions seemed kludgy (capturing an include is not
straightforward and adding a second JSP engine just to manipulate
strings is overkill).
There are also numerous templating engines, we liked StringTemplate
(http://www.stringtemplate.org/) for instance.
But in the end, we sticked to rolling out our own "engine". The code for
it is as simple as this
/**
* @param fields - if param's key begins with _ it is replaced in
the first pass, so it can contain ${} references to params replaced in
second pass
*/
private String fillInTemplate(String tmpl, Map<String, String>
fields) {
for (int pass = 1; pass <= 2; pass++) {
for (String field : fields.keySet()) {
if (field.startsWith("_") || pass == 2) {
tmpl = tmpl.replace("${" + (field.startsWith("_") ?
field.substring(1) : field) + "}", fields.get(field) != null ?
fields.get(field) : "");
}
}
}
return tmpl;
}
HTH
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