How to use Jackson DataFormat in the Java Library: AVRO to achieve data serialization
How to use Jackson DataFormat in the Java Library: AVRO to achieve data serialization
Introduction:
Jackson is a very popular Java class library that is used to process the serialization and derivativeization of data.In the Jackson library, there is a module called "Jackson DataFormat: Avro", which provides the function of serializing the data serialization in AVRO format.This article will introduce how to use Jackson DataFormat: Avro library to achieve data serialization.
Step 1: Add dependencies
To use the Jackson DataFormat: Avro library, you first need to add corresponding dependencies to the project's Maven or Gradle configuration file.
Maven configuration:
<dependency>
<groupId>com.fasterxml.jackson.dataformat</groupId>
<artifactId>jackson-dataformat-avro</artifactId>
<version>2.12.5</version>
</dependency>
Gradle configuration:
gradle
implementation 'com.fasterxml.jackson.dataformat:jackson-dataformat-avro:2.12.5'
Step 2: Define the data model class
Before realizing data serialization, the model class of data needs to be defined.Suppose the data we want to serialize is a Person object, which contains two attributes: name and Age.
public class Person {
private String name;
private int age;
// omit the constructor, Getter, and Setter method ...
}
Step 3: Realize data serialization
With the defined data model class, we can use Jackson DataFormat: Avro library to achieve the serialization of data.The following example demonstrates how to sequence a Person object into a byte array in Avro format.
import com.fasterxml.jackson.dataformat.avro.AvroMapper;
import com.fasterxml.jackson.dataformat.avro.AvroSchema;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
public class AvroSerializationExample {
public static void main(String[] args) {
// Create Person objects
Person Person = New Person ("Zhang San", 25);
// Create AVROMAPPER objects
AvroMapper mapper = new AvroMapper();
try {
// Get avro schema
AvroSchema schema = mapper.schemaFor(Person.class);
// Create byte output stream
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
// Serialized Person object
mapper.writer(schema)
.writeValue(outputStream, person);
// Get the serialized byte array
byte[] serializedData = outputStream.toByteArray();
// Print the serialized byte array
System.out.println("Serialized data: " + serializedData);
} catch (IOException e) {
e.printStackTrace();
}
}
}
Through the above code, we obtained the data model's Avro Schema with the `SchemaFor` method of the Avromapper object.Then, we created a ByteArrayoutPutstream object to store the serialized data.Finally, we use AVROMAPPER's `writer` method to series sequences of Person objects into the output stream.
Summarize:
This article introduces how to use Jackson DataFormat: Avro library to achieve data serialization.By adding dependencies, defining data model classes and writing example code, we demonstrate how to sequence a Person object into a byte array in AVRO format.Through the guidance of this article, readers can use Jackson DataFormat: Avro library to meet the needs of data serialization.
