Introduction to the JSON conversion framework in the Java class library

Introduction to the JSON conversion framework in the Java class library Overview: JSON (JavaScript Object Notation) is a lightweight data exchange format, which has become the standard for cross -platform data exchange.There are multiple JSON conversion frameworks to choose from in the Java class library. These frameworks provide the function of convenient and fast conversion between the Java object and the JSON format.This article will introduce several commonly used Java JSON conversion frameworks and provide corresponding example code. 1. Jackson: Jackson is one of the most popular Java JSON conversion frameworks.It provides high -performance data binding and conversion functions, supports serialization from Java to JSON string, and derivatives from JSON to Java objects. Example code: First, you need to add a reference to the Jackson library to the project's dependence.Then, the ObjectMapper class can be used for serialization and deepening operation. // Introduce the Jackson Library import com.fasterxml.jackson.databind.ObjectMapper; public class JsonConverter { public static void main(String[] args) throws Exception { // Create an object maper ObjectMapper objectMapper = new ObjectMapper(); // Convert java objects to json string String json = objectMapper.writeValueAsString(new Person("John", 25)); // Convert json string to Java object Person person = objectMapper.readValue(json, Person.class); System.out.println (json); // Output: {"name": "John", "Age": 25} System.out.println (Person.getName ()); // Output: John System.out.println (Person.getage ()); // Output: 25 } // Define a Person class static class Person { private String name; private int age; // Getter and Setter method omitted // Construct function omitted } } 2. Gson: GSON is another popular Java JSON conversion framework developed by Google.It provides an easy -to -use API that can easily convert between Java and JSON string. Example code: Similarly, first of all, the reference to the GSON library is added to the project dependence.You can then use the GSON class for serialization and dependentization operation. // Import the GSON library import com.google.gson.Gson; public class JsonConverter { public static void main(String[] args) { // Create GSON objects Gson gson = new Gson(); // Convert java objects to json string String json = gson.toJson(new Person("John", 25)); // Convert json string to Java object Person person = gson.fromJson(json, Person.class); System.out.println (json); // Output: {"name": "John", "Age": 25} System.out.println (Person.getName ()); // Output: John System.out.println (Person.getage ()); // Output: 25 } // Define a Person class static class Person { private String name; private int age; // Getter and Setter method omitted // Construct function omitted } } Summarize: This article introduces two common JSON conversion frameworks in the Java class library: Jackson and GSON.They provide a simple and easy -to -use API that can easily convert between Java and JSON string.Developers can choose a suitable framework according to their needs and preferences to complete the JSON conversion operation.