Discuss the technical principles of the JSON in Java framework in the Java class library

In the Java library, the technical principle of JSON in the Java framework is a lightweight data format for processing data exchange.JSON said that the JavaScript object representation, it provides a simple way to represent structural data. JSON's technical principles in the Java framework can be discussed in the following aspects: 1. JSON library: The JSON library in the Java class library provides a set of APIs used to analyze and generate JSON data.The commonly used JSON libraries include Jackson, GSON and JSON-LIB.These libraries allow developers to convert Java objects into JSON formats and can be transformed reversely to create Java objects from JSON data. 2. The JSON object indicates that the JSON library in the Java class library represents JSON data by way similar to the JavaScript object.The JSON object consists of a key-value pair. The key must be a string, and the value can be a string, a number, a Boolean value, an array, an object or a null.Developers can use the API provided by the JSON library to create and operate these JSON objects. 3. JSON data analysis: When JSON data is obtained from external data source (such as network requests or files), the JSON library in the Java class library can resolve these data.The analysis process involves the process of converting JSON data into the Java object.Developers can use the parser provided by the library to analyze JSON data and convert it to the Java object, so that the data can be operated in the Java code. 4. JSON data generation: Through the JSON library in the Java class library, developers can convert Java objects into JSON data.This process is called JSON data generation.Developers can use the generator provided by the library to create JSON data and write them into external data sources (such as network requests or files). In Java, JSON can also involve some related configuration and programming code: 1. Import json library: Developers need to first import the relevant dependencies of the selected JSON library.This can be implemented by adding the configuration of the JSON library in the project construction file (such as Maven's pom.xml). 2. Configuration of JSON library: Some JSON libraries may require some specific configuration to implement the expected function.For example, the Jackson library can be configured by the ObjectMapper to define the conversion rules of JSON to Java objects. 3. JSON analysis and generation: Use the API of the JSON library. Developers can write an analysis of JSON data and the code that generates JSON data.These code will analyze and generate JSON data based on specific conditions. Example code: The following example demonstrates the use of the Jackson library to analyze JSON data and generate JSON data code: // Import the related classes of the jackson library import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.JsonNode; // Analyze json data String jsonData = "{\"name\":\"John\",\"age\":30}"; ObjectMapper objectMapper = new ObjectMapper(); JsonNode jsonNode = objectMapper.readTree(jsonData); String name = jsonNode.get("name").asText(); int age = jsonNode.get("age").asInt(); System.out.println("Name: " + name); System.out.println("Age: " + age); // Generate json data Person person = new Person("John", 30); String jsonResult = objectMapper.writeValueAsString(person); System.out.println("JSON Result: " + jsonResult); In the above example, first analyze the JSON data as the `jsonnode` object through the` ObjectMapper` class of the Jackson library.You can then obtain the field value in JSON through the `jsonnode` object.Next, you can use the `ObjectMapper` class to convert Java objects into JSON data. Summarize: The JSON library in the Java class library provides a convenient way to process JSON data.By using these libraries, developers can easily analyze and generate JSON data.At the same time, the configuration and related programming code of the library can help achieve specific functions and customized requirements.