将Enum序列化为字符串，以便使用Jackson进行验证

public enum Status {
    ACTIVE,
    INACTIVE,
    PENDING
}

import com.fasterxml.jackson.databind.ObjectMapper;

public class EnumSerializationExample {
    public static void main(String[] args) throws Exception {
        ObjectMapper mapper = new ObjectMapper();
        Status status = Status.ACTIVE;
        String json = mapper.writeValueAsString(status);
        System.out.println(json); // 输出: "ACTIVE"
    }
}

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.13.0</version>
</dependency>

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;

import java.io.IOException;

@JsonSerialize(using = StatusSerializer.class)
public enum Status {
    ACTIVE,
    INACTIVE,
    PENDING
}

class StatusSerializer extends JsonSerializer<Status> {
    @Override
    public void serialize(Status value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
        gen.writeString(value.name());
    }
}