Java JSON framework tutorial and usage

Java JSON framework tutorial and usage Introduction: JSON (JavaScript Object Notation) is a lightweight data exchange format that is often used to transmit data between different platforms.Because of its simple and intuitive format, easy to read and write, and widespread support in many programming languages, JSON has become a very popular data transmission format.In Java development, there are many open source JSON frameworks to use. This tutorial will introduce you to several commonly used Java JSON frameworks and its usage. 1. Jackson Jackson is one of the most popular frameworks in JSON in Java.It provides fast, flexible and accurate JSON processing capabilities.Here are some common examples of usage: a) Convert java objects to JSON string: ObjectMapper objectMapper = new ObjectMapper(); String json = objectMapper.writeValueAsString(obj); b) Convert json string to Java object: String json = "{\"name\":\"John\",\"age\":30}"; ObjectMapper objectMapper = new ObjectMapper(); Person person = objectMapper.readValue(json, Person.class); c) Read data from the JSON file: ObjectMapper objectMapper = new ObjectMapper(); Person person = objectMapper.readValue(new File("data.json"), Person.class); 2. Gson GSON is a powerful JSON library developed by Google, which can be converted between Java objects and JSON.The following are examples of some common usage of GSON: a) Convert java objects to JSON string: Gson gson = new Gson(); String json = gson.toJson(obj); b) Convert json string to Java object: String json = "{\"name\":\"John\",\"age\":30}"; Gson gson = new Gson(); Person person = gson.fromJson(json, Person.class); c) Read data from the JSON file: Gson gson = new Gson(); Person person = gson.fromJson(new FileReader("data.json"), Person.class); 3. JSON.simple JSON.SIMPLE is a simple and easy -to -use Java JSON library that is suitable for processing small data sets.Here are examples of common usage of JSON.SIMPLE: a) Create a JSON object: JSONObject jsonObject = new JSONObject(); jsonObject.put("name", "John"); jsonObject.put("age", 30); b) Convert the JSON object to a string: String json = jsonObject.toJSONString(); c) Pay JSON object from a string: String json = "{\"name\":\"John\",\"age\":30}"; JSONParser jsonParser = new JSONParser(); JSONObject jsonObject = (JSONObject) jsonParser.parse(json); These selected Java JSON frameworks are just several examples of many available frameworks.According to your needs and preferences, you can choose the most suitable framework for the project.No matter which framework you choose, you can easily process JSON data in Java applications.