[开发|java] java 将json转化java对象

使用Jackson库将JSON转换为Java对象：
安装依赖

<!-- Jackson Core -->
<dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-core</artifactId><version>2.12.5</version>
</dependency><!-- Jackson Databind -->
<dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.12.5</version>
</dependency>

代码示例：

import com.fasterxml.jackson.databind.ObjectMapper;public class JsonToObjectUsingJackson {public static void main(String[] args) {String jsonString = "{\"name\": \"John\", \"age\": 30, \"email\": \"john@example.com\"}";try {ObjectMapper objectMapper = new ObjectMapper();Person person = objectMapper.readValue(jsonString, Person.class);System.out.println("Name: " + person.getName());System.out.println("Age: " + person.getAge());System.out.println("Email: " + person.getEmail());} catch (Exception e) {e.printStackTrace();}}// Java类，用于映射JSON数据public static class Person {private String name;private int age;private String email;// 省略构造函数、getter和setter方法// 注意：字段名和JSON中的键名必须匹配，或者使用注解@JsonProperty指定映射关系}
}

使用Gson库将JSON转换为Java对象：
安装依赖

<dependency><groupId>com.google.code.gson</groupId><artifactId>gson</artifactId><version>2.8.9</version>
</dependency>

代码示例：

import com.google.gson.Gson;public class JsonToObjectUsingGson {public static void main(String[] args) {String jsonString = "{\"name\": \"John\", \"age\": 30, \"email\": \"john@example.com\"}";try {Gson gson = new Gson();Person person = gson.fromJson(jsonString, Person.class);System.out.println("Name: " + person.getName());System.out.println("Age: " + person.getAge());System.out.println("Email: " + person.getEmail());} catch (Exception e) {e.printStackTrace();}}// Java类，用于映射JSON数据public static class Person {private String name;private int age;private String email;// 省略构造函数、getter和setter方法// 注意：字段名和JSON中的键名必须匹配}
}