Render template in method

[replay111]

Hi,

I want to return html as response in my json structure (one of the field), and I wanted to render this html in method using Your JTwig engine. Is it possible to do this?

[joao-de-melo]

Hi @replay111, I'm afraid I didn't got your question. Can you provide an example of what you're trying to achieve?

[replay111]

Hi,

some "example" code below:

@RequestMapping(value = {"/items"}, method = RequestMethod.POST)
@ResponseBody
public JSONResponse getDictionaryItems(@RequestBody long pm) {


    // I do not know if this is possible:
    Jtwig jtwig = new JTwig.setTemplate("dictionary/dic_items.html.twig");
    jtwig.model.put("dictionaryData",dicData);

    // This is part of the json object I want to send back
    String renderedTempalte = jtwig.renderTemplate();

    // RequestResponse is my custom class to build json for response
    return RequestResponse.setOK("html",renderedTempalte);
}

I know that will not run but I am interested mostly in part:

    // I do not know if this is possible:
    Jtwig jtwig = new JTwig.setTemplate("dictionary/dic_items.html.twig");
    jtwig.model.put("dictionaryData",dicData);

to render some template and return it as string to some variable :D

Maciej.

PS: I am using Your JTwig library in version: 3.1.1

[joao-de-melo]

We are not maintaining version 3 anymore. But it should be possible to do.

[replay111]

OK I cant switch to v5 - but generally I think that this kind of feature may work with any version :-)

[replay111]

Ok, I think that I found a solution (http://stackoverflow.com/questions/22422411/how-to-manually-render-spring-mvc-view-to-html/22422874#22422874) so I created small class:

@Service
public class JTwigRenderToStringService {

    @Autowired
    ViewResolver viewResolver;

    public String renderTemplate(String tplName, Map<String, Object> tplParameters, HttpServletRequest request) {
        String res = null;
        try {
            MockHttpServletResponse mockResp = new MockHttpServletResponse();
            View view = viewResolver.resolveViewName(tplName, Locale.getDefault());
            view.render(tplParameters, request, mockResp);
            res = mockResp.getContentAsString();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return res;
    }

}

The only problem is that I don't want to have HttpServletRequest request ;-) but all in all it works :D

Maciej.

[joao-de-melo]

I'll leave here another example which doesn't make use of test support classes.

@Service
public class JtwigRenderService {
    private final JtwigViewResolver jtwigViewResolver;

    @Autowired
    public JtwigRenderService(JtwigViewResolver jtwigViewResolver) {
        this.jtwigViewResolver = jtwigViewResolver;
    }

    public String renderTemplate(String tplName, Map<String, Object> tplParameters) throws Exception {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        JtwigView view = (JtwigView) jtwigViewResolver.resolveViewName(tplName, Locale.getDefault());
        
        jtwigViewResolver.getRenderer()
                .dispatcherFor(view.getUrl())
                .with(tplParameters)
                .render(outputStream);
        
        return outputStream.toString();
    }
}

[replay111]

Gr8!
thanx for help ;-)

[replay111]

Ok I've got error:

Error:(28, 26) java: cannot find symbol
symbol: method getRenderer()
location: variable jtwigViewResolver of type org.jtwig.spring.JtwigViewResolver

(I did copy&paste Your code)

pom:

        <dependency>
            <groupId>org.jtwig</groupId>
            <artifactId>jtwig-spring</artifactId>
            <version>5.85.0.RELEASE</version>
        </dependency>