Is there a way to make Spring Thymeleaf process a string template?

Question

I would like to write something like :

    @Autowired
    private SpringTemplateEngine engine;
....
  // Thymeleaf Context
  WebContext thymeleafContext = ne         


        

Answer 1

The solution we ended up using consisted of a new IResourceResolver with a custom Context rather than a custom TemplateResolver. We chose this because we still wanted to use classpath scanning in most cases, but occasionally had dynamic content.

The following shows how we did it:

public class StringAndClassLoaderResourceResolver implements IResourceResolver {


    public StringAndClassLoaderResourceResolver() {
        super();
    }


    public String getName() {
        return getClass().getName().toUpperCase();
    }


    public InputStream getResourceAsStream(final TemplateProcessingParameters params, final String resourceName) {
        Validate.notNull(resourceName, "Resource name cannot be null");
        if( StringContext.class.isAssignableFrom( params.getContext().getClass() ) ){
            String content = ((StringContext)params.getContext()).getContent();
            return IOUtils.toInputStream(content);
        }
        return ClassLoaderUtils.getClassLoader(ClassLoaderResourceResolver.class).getResourceAsStream(resourceName);
    }

    public static class StringContext extends Context{

        private final String content;

        public StringContext(String content) {
            this.content = content;
        }

        public StringContext(String content, Locale locale) {
            super(locale);
            this.content = content;
        }

        public StringContext(String content, Locale locale, Map variables) {
            super(locale, variables);
            this.content = content;
        }

        public String getContent() {
            return content;
        }
    }

Test Case

public class StringAndClassLoaderResourceResolverTest {

    private static SpringTemplateEngine templateEngine;

    @BeforeClass
    public static void setup(){
        TemplateResolver resolver = new TemplateResolver();
        resolver.setResourceResolver(new StringAndClassLoaderResourceResolver());
        resolver.setPrefix("mail/"); // src/test/resources/mail
        resolver.setSuffix(".html");
        resolver.setTemplateMode("LEGACYHTML5");
        resolver.setCharacterEncoding(CharEncoding.UTF_8);
        resolver.setOrder(1);

        templateEngine = new SpringTemplateEngine();
        templateEngine.setTemplateResolver(resolver);
    }

    @Test
    public void testStringResolution() {
        String expected = "
dave
";
        String input = "
Some Username Here!
";
        IContext context = new StringAndClassLoaderResourceResolver.StringContext(input);
        context.getVariables().put("userName", "dave");
        String actual = templateEngine.process("redundant", context);
        assertEquals(expected, actual);
    }

    @Test
    public void testClasspathResolution(){
        IContext context = new Context();
        context.getVariables().put("message", "Hello Thymeleaf!");
        String actual = templateEngine.process("dummy", context);
        String expected = "
Hello Thymeleaf!
";
        assertEquals(expected, actual);
    }
}

Dummy template file at src/main/resources/mail/dummy.html

A message will go here!

Note: We used Apache CommonsIO's IOUtils for converting the String to an InputStream