Jackson Module Jaxb Annotations technical principles and application instance sharing
Jackson Module Jaxb Annotations technical principles and application example sharing
Jackson is a Java library for processing JSON data. It provides a simple and efficient way to convert the Java object into JSON format and convert JSON format into Java objects.The Jackson library adds meta data by annotating to the Java object to control the conversion process of the object to JSON.Jackson Module Jaxb Annotations is a expansion module of Jackson, which allows the use of JAXB annotations to control the conversion of the object to JSON.
Technical principle:
The Jackson library uses the Java reflection to read the attributes of the Java object and convert it into a JSON format.Jackson Module Jaxb Annotations completes the conversion of objects to JSON by analyzing the JAXB annotation of Java objects.JAXB (Java Architecture for XML Binding) is a standard in Java for conversion between XML and Java objects.It uses annotations to describe the mapping relationship between Java objects and XML elements.Jackson Module Jaxb Annotations uses JAXB's annotations to control the conversion process of Java objects to JSON.
Applications:
Below is a simple example of using Jackson Module Jaxb Annotations:
First, we define a Java class to represent a student object:
import javax.xml.bind.annotation.*;
@XmlRootElement
public class Student {
private String name;
private int age;
public Student() {}
public Student(String name, int age) {
this.name = name;
this.age = age;
}
@XmlElement
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@XmlElement
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
Then, we use the Jackson library to convert the Student object into a JSON string:
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.module.jaxb.JaxbAnnotationModule;
public class Main {
public static void main(String[] args) throws Exception {
// Create ObjectMapper objects and register
ObjectMapper objectMapper = new ObjectMapper();
JaxbAnnotationModule module = new JaxbAnnotationModule();
objectMapper.registerModule(module);
// Create a Student object
Student Student = New Student ("Zhang San", 20);
// Convert the student object to a JSON string
String json = objectMapper.writeValueAsString(student);
// Output json string
System.out.println(json);
}
}
Run the above code, the output result is:
{"name": "Zhang San", "Age": 20}
In the above code, we first created an ObjectMapper object and registered the JAXBANNOTIONMOLULE.Then, we created a Student object and used the WriteValueasstring method of ObjectMapper to convert the Student object into a JSON string.Finally, we output the JSON string to the console.
By using Jackson Module Jaxb Annotations, we can easily control the conversion process of Java objects to JSON through JAXB annotations, thereby simplifying the serialization and derivative operation of the object.This allows us to process JSON data more flexibly.
