I've gotten StringTemplate to work with Spring. Basically, all it took was a custom view.
But first, a disclaimer: This is an experimental hack. I've never used this in production code, and it could use some improvement before that happens. I think it is adequate to answer your question about how easily StringTemplate integrates with a Web MVC framework, however.
Reference: Spring Web MVC documentation
StringTemplateView.java:
import java.io.PrintWriter;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.antlr.stringtemplate.StringTemplate;
import org.antlr.stringtemplate.StringTemplateGroup;
import org.springframework.core.io.Resource;
import org.springframework.web.servlet.view.InternalResourceView;
public class StringTemplateView extends InternalResourceView {
@Override
protected void renderMergedOutputModel(Map model, HttpServletRequest request,
HttpServletResponse response) throws Exception {
// Provides a Spring resource descriptor referring to the .st file
Resource templateFile = getApplicationContext().getResource(getUrl());
// Kind of redundant...
StringTemplateGroup group = new StringTemplateGroup("group", templateFile.getFile().getParent());
StringTemplate template = group.getInstanceOf(getBeanName());
template.setAttributes(model);
// Output to client
PrintWriter writer = response.getWriter();
writer.print(template);
writer.flush();
writer.close();
}
}
And an example view resolver definition:
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="myapp.web.view.StringTemplateView"/>
<property name="prefix" value="/WEB-INF/st-views/"/>
<property name="suffix" value=".st"/>
</bean>