Map集合 实体类对象的相互转换

一、Map转实体类

1. fastjson工具类

导入依赖

<dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.54</version>
</dependency>

代码实现 

   Map<String, Object> authorMap = new HashMap<>();authorMap.put("id", 10L);authorMap.put("name", "蜡笔小新");authorMap.put("category", "分类");authorMap.put("score", 90);authorMap.put("intro", "简介");Book book = JSON.parseObject(JSON.toJSONString(authorMap), Book.class);System.out.println(book);

2. Jackson工具类

导入依赖

<!-- Jackson 核心库 -->
<dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-core</artifactId><version>2.12.5</version>
</dependency><!-- Jackson 数据绑定库 -->
<dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.12.5</version>
</dependency>

代码实现

import com.fasterxml.jackson.databind.ObjectMapper;Map<String, Object> personMap = new HashMap<>();
personMap.put("name", "John");
personMap.put("age", 20);ObjectMapper mapper = new ObjectMapper();
Person person = mapper.convertValue(personMap, Person.class);

3. apache.commons.beanutils工具类

导入依赖

<dependency><groupId>commons-beanutils</groupId><artifactId>commons-beanutils</artifactId><version>1.8.0</version><scope>compile</scope>
</dependency>

代码实现

Map<String, Object> map = new HashMap<>();
map.put("id", 1);
map.put("name", "John");
map.put("age", 25);
Person person = new Person();
BeanUtils.populate(person, map);

二、实体类转Map

1. fastjson工具类

导入依赖

<dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.54</version>
</dependency>

代码实现

        Book book1 = new Book();book1.setId(1l);book1.setName("风间");book1.setCategory("分类");book1.setIntro("简介");book1.setScore(100);Map map = JSON.parseObject(JSON.toJSONString(book1), Map.class);System.out.println(map);

2. Jackson工具类

导入依赖

<!-- Jackson 核心库 -->
<dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-core</artifactId><version>2.12.5</version>
</dependency><!-- Jackson 数据绑定库 -->
<dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.12.5</version>
</dependency>

代码实现

import com.fasterxml.jackson.databind.ObjectMapper;Person person = new Person("John", 20);ObjectMapper mapper = new ObjectMapper();
Map<String, Object> personMap = mapper.convertValue(person, Map.class);

3. apache.commons.beanutils工具类

导入依赖

<dependency><groupId>commons-beanutils</groupId><artifactId>commons-beanutils</artifactId><version>1.8.0</version><scope>compile</scope>
</dependency>

代码实现

Map<String, String> map = BeanUtils.describe(person);
map.remove("class");