Template engine java app engine

The HTML web page is referred to as a template since data values dynamically replace the template markup when the page is rendered. One of the first template engines was PHP , which dates to the early days of the Web. These include Apache Velocity , FreeMarker , Thymeleaf and Pippo which seems to have evolved from an earlier template engine named Pebble. A web application may consist of a large number of web pages.

For example, the nderground social network, built by Topstone Software , has over 35 web pages. Designing and developing these web pages represents a significant portion of the effort that went into building the web application. Choosing the template engine for web page implementation is a important investment in the software architecture.

A core requirement in evaluating a Java template engine was whether it is supported by the Spring framework, which Topstone Software uses to develop web applications.

Three template engines, which are supported by Spring, have been evaluated. In addition to supporting Spring, the template library needs to support the ability to include insert HTML fragements into the main page.

This feature allows common CSS and JavaScript includes in the page header and common page headings and footers to be included in the application pages. The best way to evaluate a template engine or any software development framework is to use it in a real application. Each of the template engines was used in a version of the Cognito Demonstration application. The Cognito demonstration application was developed to explore the AWS Cognito authentication service.

The application includes ten web pages, where almost every page includes dynamic server side data. The example below shows how conditional logic can be added for server side page generation. When a page is sent to the client, it will consists of static HTML, which has been dynamically generated on the server. Thymeleaf is currently popular in the Spring community. Many articles on Spring use Thymeleaf in the example web pages.

An example showing Thymeleaf markup is shown below. Thymeleaf supports th:replace and th:include tags which allow sections of HTML to be inserted into the page. The example below shows how the th:replace tag can be used to insert the CSS and JavaScript links into the page head. The th:replace tag is also used to add a page header so that pages have common title headings.

When Thymeleaf encounters an error while processing Thymeleaf markup, it throws a Java exception. This exception does not contain any information i. This can make finding and correcting a Thymeleaf markup error time consuming, slowing application development. Although Thymeleaf is popular in the Spring community and Thymeleaf is currently supported by the Spring Tool Suite project builder, I noticed that Thymeleaf is not supported by Pivotal the company that supports the Spring framework.

Thymeleaf is supported by three GitHub committers and most of the GitHub commits are from two people. For the last step, we will create again under that webapp folder and new folder called thymeleaf.

We add thyme. And congratulations you have successfully configured all four Spring Boot Supported Template Engines. At the end of the configuration section, it is important to point out that each of the engines has assigned its own Controller which is responsible for a proper output generation. Now is the right time to write a few last words about the general feeling from all mentioned possibilities. I have created a sample Gradle project that imports all Temple engines starter.

This setup can be found inside the configuration file build. Published at DZone with permission of Miro Wengner. See the original article here. Web Dev Zone.

Thanks for visiting DZone today,. Edit Profile. Sign Out View Profile. Over 2 million developers have joined DZone. A Review of Java Template Engines. Like Join the DZone community and get the full member experience. Join For Free. Here is the deprecated engine that has been widely used over last several years. Apache Velocity Apache Velocity Template Engine is used for comparison and also to make testing the other three alternatives FreeMarker, Thymeleaf, and Pebble a little bit simpler.

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