import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;

/**
 * java map转实体类
 */
public class MapToEntityConverter {

    public static <T> T convertMapToEntity(Map<String, Object> map, Class<T> entityClass) {
        T entity;
        try {
            entity = entityClass.newInstance();
            Field[] fields = entityClass.getDeclaredFields();
            for (Field field : fields) {
                String fieldName = field.getName();
                if (map.containsKey(fieldName)) {
                    field.setAccessible(true);
                    field.set(entity, map.get(fieldName));
                }
            }
        } catch (Exception e) {
            throw new RuntimeException("Error converting map to entity", e);
        }
        return entity;
    }

    public static void main(String[] args) {
        //Map<String, Object> map = Map.of("name", "John Doe", "age", 30);
        Map<String, Object> map = new HashMap<String, Object>() {
            {
                put("name", "John Doe");
                put("age", 30);
            }
        };
        //map.forEach((k,v)-> System.out.println(k));
        Person person = convertMapToEntity(map, Person.class);
        System.out.println(person.getName()); // John Doe
        System.out.println(person.getAge());  // 30
    }
}

class Person {
    private String name;
    private int age;

    // getters and setters
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

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