Learn about the technical principles and implementation of the Jackson DataFormat XML framework in the Java library

Title: Learn from the technical principles and implementation of the technical principles and implementation of the Jackson DataFormat XML framework Summary: Jackson DataFormat XML is a popular XML processing framework in the Java class library. It reads and writes data by serializing and dee -order conversion by serializing and deepericularization of Java objects with XML data.This article will explore the technical principles and implementation methods of the Jackson DataFormat XML framework, and explain its usage through the Java code example. Introduction: In modern Internet applications, data transmission and exchange are inevitable.Under normal circumstances, we choose to use XML as a data format for transmission and storage.The Jackson DataFormat XML framework is designed specially to solve the XML data processing problem. Introduction to Jackson DataFormat XML Jackson DataFormat XML is a expansion module based on the Jackson framework. It aims to provide the function of converting XML data into Java objects (desertile) and converting Java objects into XML data (serialization).It provides a similar experience and interface to the Jackson JSON library by using the annotations and APIs in the Jackson core library. 2. Technical principles 1. Data Binding Jackson DataFormat XML uses data binding technology to realize the conversion between XML data and Java objects.It relies on annotations in the Jackson framework, such as@jsoninclude,@jsonproperty, etc., as well as information about the fields of Java class, accessor methods (Getter and Setter), and map XML data to the Java object. 2. XML parsing and generation Jackson DataFormat XML uses XML parser to resolve the input XML data and use XML generator to generate the output XML data.It supports multiple XML parsers and generators, including STAX, DOM, XMLPULLLPARSER, etc.When parsing and generating XML data, the Jackson DataFormat XML indicates that the elements, attributes, attributes that need to be processed and the mapping relationship between them and the Java objects are instructed. Third, implementation method Below the Java code example to demonstrate the implementation of Jackson DataFormat XML. 1. Introduce dependencies First of all, you need to add Jackson DataFormat XML to the project constructing configuration file (such as Maven's pom.xml). <dependency> <groupId>com.fasterxml.jackson.dataformat</groupId> <artifactId>jackson-dataformat-xml</artifactId> <version>2.12.3</version> </dependency> 2. Define the Java object Suppose we have a Person class to represent a person's information: public class Person { private String name; private int age; // Getter and Setter method omitted } 3. Serialization and deepening serialization Next, we can use the Jackson DataFormat XML framework to sequence the Java object to XML data, or sequence the XML data to the Java object: import com.fasterxml.jackson.dataformat.xml.XmlMapper; public class XmlSerializationExample { public static void main(String[] args) throws Exception { // Create XMLMAPPER objects XmlMapper xmlMapper = new XmlMapper(); // Create a Person object Person person = new Person(); Person.setname ("Zhang San"); person.setAge(25); // Sequence to XML data String xml = xmlMapper.writeValueAsString(person); System.out.println(xml); // Revisible sequence to Java object Person deserializedPerson = xmlMapper.readValue(xml, Person.class); System.out.println(deserializedPerson); } } In the above example, we use XMLMAPPER to serialize and deepen the Person object.The serialization operation is called to convert the Java object into XML data by calling the method by calling `xmlmapper.writeValueASSTRING (), and the inverse serialization operation converts the XML data to the Java object by calling the` xmlmapper.readvalue () method. in conclusion: This paper discusses the technical principles and implementation of the Jackson DataFormat XML framework. We understand that it is a expansion module based on the Jackson framework, and the conversion between XML data and Java objects is achieved through data binding and XML analysis/generating technology.Using Jackson DataFormat XML, we can easily process XML data in Java applications, and implement the functions of serialization and deeperization.