map轉換成VO

1、pom.xml依賴

<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.16.10</version>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.11.0</version>
</dependency>

2、實體類

import lombok.Data;

@Data
public class Student {
    // 唯一標識
    private int id;

    // 年齡
    private int age;

    // 姓名
    private String name;
}

3、map轉換爲VO

import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.it.vo.Student;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;


/**
 * 轉換實體
 */
public class Convert {
    /**
     * 將map轉換爲VO
     *
     * @param list 轉換前map集合
     * @return 轉化後VO集合
     */
    public List<Student> convertMapToVo(List<Map<String, Object>> list) {
        ObjectMapper objectMapper = new ObjectMapper();
        // 如果有字段在VO不存在，不報錯
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        List<Student> stuList = list.stream()
                .map(stuMap -> objectMapper.convertValue(stuMap, Student.class))
                .collect(Collectors.toList());
        return stuList;
    }

    public static void main(String [] args){
        Convert test = new Convert();
        Map<String, Object> map1 = new HashMap<>();
        map1.put("id", 01);
        map1.put("age", 18);
        map1.put("name", "何剛");
        Map<String, Object> map2 = new HashMap<>();
        map2.put("id", 02);
        map2.put("age", 23);
        map2.put("name", "葉英");
        List<Map<String, Object>> list = new ArrayList<>();
        list.add(map1);
        list.add(map2);
        test.convertMapToVo(list);
    }
}