Detailed explanation of the technical principles of the Kryo framework in the Java class library
The KRYO framework is a fast and efficient Java object serialization library with lower serialization and deepening time, as well as smaller serialization.This article will introduce the technical principles of the Kryo framework in detail and provide the corresponding Java code example.
1. Introduction to the Kryo framework
The Kryo framework was developed by ESoteric Software and aims to provide a fast and efficient serialization solution.Compared to the serialization method in the Java standard library, the Kryo framework has higher performance and smaller serialization.The KRYO framework is serialized by converting Java objects into byte flow, thereby storage and transmission of objects.
2. Technical principle of the KRYO framework
1. Registration class and field: Before using the KRYO framework for serialization, you need to register a class and fields that need to be serialized in advance.In this way, the Kryo framework knows how to deal with these classes and fields.You can register the class and fields through the KRYO register () method, or you can use Kryo's annotation@registry to register.
2. Management reference: In order to reduce the size of the serialization, the Kryo framework uses reference to manage repeated objects.When a object is serialized for the first time, its complete information is written, and when this object is encountered again, you only need to write a reference.This reference method effectively reduces the serialization.
3. Quick serialization and derivativeization: The KRYO framework can improve the serialization and deepertization performance by calling the field of directly accessing objects, instead of calling the Getter and Setter method.This method eliminates the expenses of the method call, thereby speeding up the speed of serialization and deepening.
4. Custom serialization: The KRYO framework allows users to customize the logic of serialization and derivativeization.By achieving the kryo's Serializer interface, the process of serialization and deepeningization can be customized according to actual needs.For some special types of objects, custom serialization can further improve performance.
Third, the example code of the Kryo framework
Below is a sample code that uses the KRYO framework for serialization and back -sequentialization:
import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.io.Input;
import com.esotericsoftware.kryo.io.Output;
import java.io.FileInputStream;
import java.io.FileOutputStream;
public class KryoSerializationExample {
public static void main(String[] args) throws Exception {
// Create a Kryo instance
Kryo kryo = new Kryo();
// Register a class that needs to be serialized
kryo.register(User.class);
// Create output stream
Output output = new Output(new FileOutputStream("user.bin"));
// Create objects and serialize
User user = new User("Alice", 25);
kryo.writeObject(output, user);
output.close();
// Create an input stream
Input input = new Input(new FileInputStream("user.bin"));
// Reverse sequentialization object
User deserializedUser = kryo.readObject(input, User.class);
input.close();
// Print the object of the printed back -sequentialization
System.out.println("Name: " + deserializedUser.getName());
System.out.println("Age: " + deserializedUser.getAge());
}
}
class User {
private String name;
private int age;
public User() {}
public User(String name, int age) {
this.name = name;
this.age = age;
}
public String getName() {
return name;
}
public int getAge() {
return age;
}
}
In the above code, we first created a Kryo instance and registered the User class that requires serialized.Then, write the User object into the output stream for serialization and close the output stream.Next, we use the input stream to derive and print the name and age of the USER object after the counter -sequentialization.
Through the above examples, we can see the simple usage of the KRYO framework and its fast and efficient serialization and desertified performance.
Summarize:
The KRYO framework realizes the technical principles such as registered and fields, management references, rapid serialization and deepening serialization, and custom serialization, and realizes rapid and efficient object serialization and dependentization.We can choose the Kryo framework in the scenario that needs to be serialized by the object to improve the performance of serialization and deepertaization, and customize according to actual needs.
