The technical principles of the JSON In Java framework in the Java class library

Analysis of the technical principles of the JSON in Java framework in the Java class library introduction: With the widespread popularity of Internet applications, data interaction between different systems has become more and more important.In order to achieve data transmission between different systems, a general data exchange format is required.JSON (JavaScript Object Notation) is a very popular data exchange format that is especially suitable for data exchange between web applications.In the Java class library, we often use the JSON in Java framework to process JSON data. This article will in -depth analysis of the technical principles of the JSON In Java framework. Introduction to JSON JSON is a lightweight data exchange format that transmits data between people and computers in a way that is easy to read and write.It is based on a subset of JavaScript and can be used to represent structured data.JSON data is organized in the form of key value pairs, which is usually called JSON object.JSON data can be nested, that is, other JSON objects or JSON arrays in JSON objects. 2. Introduction to JSON in Java framework The JSON In Java framework is a Java class library for processing JSON data.It provides a series of APIs that allow Java developers to easily analyze JSON data, generate JSON data, and operate JSON objects. 1. Analyze JSON data: The JSON In Java framework provides an API that analyzes JSON data. Developers can analyze JSON data as Java objects by calling the corresponding method.In this way, we can easily process JSON data in Java, such as obtaining specific attributes, conducting conditional judgments, and so on.The following is a simply analytical example of JSON data: String jsonStr = "{\"name\": \"John\", \"age\": 30, \"city\": \"New York\"}"; JSONObject obj = new JSONObject(jsonStr); String name = obj.getString("name"); int age = obj.getInt("age"); String city = obj.getString("city"); 2. Generate JSON data: In addition to analyzing JSON data, the JSON In Java framework also supports generating JSON data.Developers can convert Java objects into json string by calling the corresponding method.The following is a simple example of generating JSON data: JSONObject obj = new JSONObject(); obj.put("name", "John"); obj.put("age", 30); obj.put("city", "New York"); String jsonStr = obj.toString(); Third, the technical principles of the JSON in Java framework The implementation principles of the JSON in Java framework are mainly divided into two aspects: analysis of JSON data and generating JSON data. 1. Analyze JSON data: Analysis of JSON data is the process of converting the JSON string into a Java object.The JSON In Java framework is divided into different JSON objects or JSON arrays in accordance with JSON's grammatical rules. When encountering the left flower bracket ({), it indicates that starting a JSON object; when encountering the right flower bracket (}), it means that the analysis of a JSON object is over. When encountering the left parentheses ([), it means starting to analyze a JSON array; when the right bracket (]] is encountered, the analysis of a JSON array is over. When encountering a colon (:), it indicates a separate separation of a key value pair. When encountering a comma (,), it means the separation between multiple key values or array elements. Through continuous recursive analysis, the JSON string was finally parsed as Java object. 2. Generate JSON data: The process of generating JSON data is the process of converting Java to the JSON string.The JSON In Java framework traverses the attributes of the Java object by recursively. When the value of the attribute is the basic data type (such as string, integer, etc.), the name and value of the attribute directly stitch the attribute. When the value of the attribute is a reference type (such as an object or an array), recursively calls the method of generating the JSON data to stitch the name of the attribute and the generated JSON string. Through continuous recursive traversal, the Java object was finally converted into a JSON string. Fourth, summary The JSON In Java framework is one of the important technologies used in the Java library to process JSON data. It provides convenient API to allow developers to easily analyze and generate JSON data.This article analyzes the technical principles of the JSON In Java framework in detail to cover the process of analysis of JSON data and generating JSON data.It is hoped that readers can understand the JSON in Java framework more in this article and be able to use it flexibly in actual development.