[开发|java] java 将json转化java对象

ゝ一世哀愁。 2024-03-22 21:31 95阅读 0赞

1.  使用Jackson库将JSON转换为Java对象：  
    安装依赖

<dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-core</artifactId>
        <version>2.12.5</version>
    </dependency>
    
    
    <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
        }
    }

1.  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
        }
    }