Analysis and use guide in the Kryo framework technical principle in the Java class library

KRYO is a high -performance Java serialization framework, which is often used for distributed systems, network transmission, cache and other scenarios.This article will explore the technical principles of the Kryo framework and provide usage guidelines and Java code examples. ## technical analysis The KRYO framework can achieve the rapid serialization and derivativeization of the object by serializing the Java object into byte flow.Compared with the built -in serialization mechanism of Java, Kryo has higher performance and smaller serialization volume. The working principle of the Kryo framework is as follows: 1. Registration class: Before using the Kryo framework, you need to register all the class to participate in serialization.In this way, Kryo can create a unique identifier for each class to reference the correct class during serialization.The code of the registration class is shown below: Kryo kryo = new Kryo(); kryo.register(User.class); kryo.register(Order.class); // Register more categories ... 2. Create a KRYO instance: Before starting serialization and desertification, you need to create a Kryo object.The Kryo object can be reused in the application, so it can be managed as a single case or the use of the object pool.The code for creating a Kryo instance is as follows: Kryo kryo = new Kryo(); 3. Serialization object: To serialize a Java object, you need to create an output stream (such as bytearrayoutputStream), and use the Kryo object to write the object into the stream.The serialization code is as follows: below: User user = new User(); user.setName ("Zhang San"); user.setAge(25); Output output = new Output(new FileOutputStream("data.bin")); kryo.writeObject(output, user); output.close(); 4. Reverse -sequentialized object: To deepen a Java object, you need to create an input stream (such as bytearrayinputStream), and use the Kryo object to read the object from the stream.Calmization code is as follows: below: Input input = new Input(new FileInputStream("data.bin")); User user = kryo.readObject(input, User.class); input.close(); ## user's guidance 1. Add dependencies: Add Kryo dependencies in the construction document of the project, as shown below: <dependency> <groupId>com.esotericsoftware.kryo</groupId> <artifactId>kryo</artifactId> <version>5.1.1</version> </dependency> 2. Registration class: Before using the KRYO framework, make sure to register the register method for all involved classifications. Kryo kryo = new Kryo(); kryo.register(User.class); kryo.register(Order.class); // Register more categories ... 3. Serialization and deepening objects: The KRYO framework serialize and the derivativeized Java objects are used based on the previous technical principles. User user = new User(); user.setName ("Zhang San"); user.setAge(25); Output output = new Output(new FileOutputStream("data.bin")); kryo.writeObject(output, user); output.close(); Input input = new Input(new FileInputStream("data.bin")); User deserializedUser = kryo.readObject(input, User.class); input.close(); 4. Upgrade/downgrade version: If you need to upgrade the KRYO framework version, you need to pay attention to whether the serialized object is compatible with the new version.In the case of incompatibility, the old version of the old version of the old version can be used by retaining the old version of the Kryo instance, or using the KRYO category name (Class Name) to handle version compatibility issues. kryo.register(User.class, new CompatibleFieldSerializer(kryo, User.class)); ## in conclusion This article details the technical principles and use guidelines of the Kryo framework.By using the KRYO framework, the serialization and derivativeization of the Java object can be quickly and efficient.By using the function and characteristics of KRYO reasonably, the performance of distributed systems, network transmission, and cache can be further optimized.