Java：Bean实体对象和Map互相转换

本文介绍Java的Bean实体对象和Map互相转换的几种方法

测试用到的实体类

@Data
class Person {
    private String name;
    private Integer age;
}

方式一：Hutool工具类

依赖

<!-- hutool -->
<dependency>
    <groupId>cn.hutool</groupId>
    <artifactId>hutool-all</artifactId>
    <version>5.4.6</version>
</dependency>

引入工具类

import cn.hutool.core.bean.BeanUtil;

对象转换为Map

Person person = new Person();
person.setName("Alice");
person.setAge(30);

// 对象转换为Map
Map<String, Object> map = BeanUtil.beanToMap(person);

System.out.println(map);
// 输出：{name=Alice, age=30}

Map转换为对象

Map<String, Object> map = new HashMap<>();
map.put("name", "Alice");
map.put("age", 30);

// Map转换为对象
Person person = BeanUtil.mapToBean(map, Person.class, true, null);

System.out.println(person);
// 输出：Person(name=Alice, age=30)

方式二：Jackson库

依赖

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.13.4</version>
</dependency>

import com.fasterxml.jackson.databind.ObjectMapper;

对象转换为Map

Person person = new Person();
person.setName("Alice");
person.setAge(30);

ObjectMapper objectMapper = new ObjectMapper();

// 对象转换为Map
Map<String, Object> personMap = objectMapper.convertValue(person, Map.class);
System.out.println(personMap);
// 输出：{name=Alice, age=30}

Map转换为对象

Map<String, Object> map = new HashMap<>();
map.put("name", "Alice");
map.put("age", 30);

ObjectMapper objectMapper = new ObjectMapper();

// Map转换为对象
Person person = objectMapper.convertValue(map, Person.class);
System.out.println(person);
// 输出：Person(name=Alice, age=30)

参考

1、java中对象和Map互相转换的几种方式