The best practice in the development of the Commons Digester framework in the development of the Java library

The Commons Digester framework is a popular Java class library that is used to quickly resolve XML files into Java objects.This article will introduce the best practice of using the Commons Digester framework in the development of the Java library, and provide some Java code examples. 1. Add dependence First, we need to add the Commons Digest frame to the dependence of the project.In the Maven project, the following dependencies can be added to the POM.XML file: <dependency> <groupId>commons-digester</groupId> <artifactId>commons-digester</artifactId> <version>2.1</version> </dependency> 2. Create a DIGESTER object Before we use the Commons Digerster framework, we need to create a Digetter object.The DIGESTER object is the core component of the parser, which is responsible for analyzing the XML file and creating the corresponding Java object.You can create a Digest object in the following way: Digester digester = new Digester(); 3. Configure the DIGESTER rule Next, we need to configure the rules of the DIGESTER object.These rules describe how to analyze XML files and convert them into Java objects.Common rules include using XPath expressions to match the XML node, and set the corresponding value using the Java method or attribute settings.The following is the configuration of an example rule: digester.addObjectCreate("root", Root.class); digester.addSetProperties("root"); digester.addObjectCreate("root/child", Child.class); digester.addSetProperties("root/child"); digester.addSetNext("root/child", "addChild"); In the above example, we use the adDObjectCreate method to specify an instance object that resolves the XML node as the root class.The addsetproperties method is used to set the attributes of the root object.Then, we analyze the XML node as an instance object of the Child class using the addobjectCreate method, and set the attribute of the Child object using the addsetproperties method.Finally, use the addsetnext method to add the Child object to the sub -node list of the root object. Fourth, analyze XML file After configured the DIGESTER rules, we can use the Digerster object to analyze the XML file.The following is an analysis code of an example: File xmlFile = new File("input.xml"); Root root = (Root)digester.parse(xmlFile); In the above example, we simply create a file object to represent the path of the XML file, and then use the PARSE method to analyze the XML file as a root object. Through the above steps, we can easily use the Commons Digester framework to analyze the XML file into a Java object.It simplifies the analysis process and greatly improves development efficiency. Summarize: This article introduces the best practice to use the Commons Digest framework in the development of the Java library.By adding the steps of dependency, creating DIGESTER objects, configuration analysis rules, and analysis of XML files, we demonstrate how to use the framework to quickly analyze the XML file.I hope this content will be helpful to you in actual development.