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Using thymeleaf without Spring, Servlet Container, Controller specific logic

See original GitHub issue

I have missed about 30 minutes trying to figure out how to generate email HTML body from my service. This is a scheduled task, not an API call - means no controllers and Spring integrations. I have raw java and I want to process single *.html file with Thymeleaf. How to do that?

In other words, I need Thymeleaf analogy for Velocity example:

VelocityEngine ve = new VelocityEngine();
ve.init();
Template t = ve.getTemplate( "helloworld.vm" );
VelocityContext context = new VelocityContext();
context.put("name", "World");
StringWriter writer = new StringWriter();
t.merge( context, writer );

P.S. I’ve read this issue, it doesn’t provide an answer. Both Thymeleaf doc and thymeleafexamples-gtvg are bound to controller logic, resolvers and other stuff I do not need.

Issue Analytics

State:
Created 7 years ago
Reactions:9
Comments:18 (7 by maintainers)

Top GitHub Comments

28reactions

huffstlercommented, May 8, 2019

For those that may find this later on (like I did), I have a small working example.

pom dependencies

<dependencies>
    <dependency>
        <groupId>org.thymeleaf</groupId>
        <artifactId>thymeleaf</artifactId>
        <version>3.0.11.RELEASE</version>
    </dependency>
    <!-- 
    If you don't like seeing messages in stdout from slf4j, add this dependency 
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-nop</artifactId>
        <version>1.7.25</version>
    </dependency> 
    -->
</dependencies>

resources/templates/greeting.html

<!DOCTYPE HTML>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <title>Name & Date HTML example</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>
    <p th:text="'Hello, ' + ${name} + '!'" />
    <p th:text="'Today is ' + ${date} + '.'"/>
</body>
</html>

Application.java in hello package

package hello;

import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.Context;
import org.thymeleaf.templatemode.TemplateMode;
import org.thymeleaf.templateresolver.ClassLoaderTemplateResolver;
import java.time.LocalDateTime;
public class Application {
    public static void main(String[] args) {
        TemplateEngine templateEngine = new TemplateEngine();
        ClassLoaderTemplateResolver resolver = new ClassLoaderTemplateResolver();
        resolver.setPrefix("/templates/");
        resolver.setSuffix(".html");
        resolver.setCharacterEncoding("UTF-8");
        resolver.setTemplateMode(TemplateMode.HTML); // HTML5 option was deprecated in 3.0.0
        templateEngine.setTemplateResolver(resolver);
        Context ct = new Context();
        ct.setVariable("name", "foo");
        ct.setVariable("date", LocalDateTime.now().toString());
        System.out.println(templateEngine.process("greeting.html", ct));
    }
}

2reactions

mahozadcommented, Apr 25, 2022

Here is a related Stack Overflow post: How to use Thymeleaf to make only a simple Java app (without Spring).

Borrowing from @huffstler solution above for Java, here is the same solution for Kotlin:

import org.thymeleaf.TemplateEngine
import org.thymeleaf.context.Context
import org.thymeleaf.templatemode.TemplateMode
import org.thymeleaf.templateresolver.ClassLoaderTemplateResolver
import java.time.LocalDateTime

fun main() {
    val resolver = ClassLoaderTemplateResolver().apply {
        templateMode = TemplateMode.HTML
        characterEncoding = "UTF-8"
        prefix = "/templates/"
        suffix = ".html"
    }
    val context = Context().apply {
        setVariable("name", "Lind")
        setVariable("date", LocalDateTime.now().toString())
    }
    val templateEngine = TemplateEngine().apply {
        setTemplateResolver(resolver)
    }
    val result = templateEngine.process("greeting", context)
    println(result)
}

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