Technical principles of the core framework of the scalant in the Java class library

SCALATE is an open source template engine that can be used in Java and Scala programming languages.It provides a simple and flexible way to generate various types of text outputs, such as HTML, XML, and pure text.A series of technical principles are implemented inside the framework that can efficiently process template analysis and rendering. 1. Template analysis One of the core technical principles of Scalat is template analysis.Template is a text file with a placement, which contains a specific mark to insert dynamic data.SCALATE uses an open template language, such as the scaml of the SCALATE template engine, and other extensions of other Scalat template engines (SCAML) and Scalaate template engines (SCAML).The process of template analysis includes steps such as reading template files, parsing template grammar, identification and analysis of place occupies. Below is a simple SCALATE template example (file name template.scaml): html head Title name list body H1 name list ul % for(name <- names) li= name In this example, we use the SCALATE template engine (SCAML) syntax.Among them, "% for (name <-names)" is a circular statement that inserts each name in the names list as a li element into the UL list. Template rendering Template rendering is another key technical principle of Scalaton.Once the template analysis is complete, Scalant can use the provided data to fill the placeholders in the template and generate the final text output.The process of template rendering includes matching the data with the template occupies, inserting dynamic data, and output the result into the final text. Here are a simple Java code example to demonstrate how to use Scalaate rendering templates: import org.fusesource.scalate.TemplateEngine; import org.fusesource.scalate.Template; import java.util.HashMap; import java.util.Map; public class ScalateExample { public static void main(String[] args) throws Exception { TemplateEngine engine = new TemplateEngine(); Template template = engine.compile(new File("template.scaml")); Map<String, Object> model = new HashMap<>(); Model.put ("names", arrays.aslist ("Zhang San", "Li Si", "Wang Wu"); String output = template.render(model); System.out.println(output); } } In this example, first of all, we created a Templatengine object, and then compiled the template file using the object.Next, create a MAP object called Model for dynamic data required for the storage template.We then use the Render method to render the template and data into the final text output. Summarize: The technical principles of the SCALATE template engine cover two key aspects: template parsing and rendering.Template parsing can identify and analyze the placeholders by reading and parsing the template syntax, while the template rendering is to fill the dynamic data into the template and generate the final text output.By using Scalaton, developers can easily generate various types of text outputs, thereby improving the maintenance and reusability of the code. I hope this article can help you understand the technical principles of the core framework of the Scalaton.