Map集合 & 实体类对象的相互转换

末蓝、 2024-03-23 19:57 238阅读 0赞

### 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 ####

<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 ####

#### 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");