自定义注解

import com.fasterxml.jackson.annotation.JacksonAnnotationsInside;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * @author chage
 */
@Target({ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
@JacksonAnnotationsInside
public @interface JsonFieldPrefix {
    String value() default "";

    String splitStr() default "";

    boolean trimOrNot() default false;

    boolean arrayOrNot() default false;
}

 具体处理逻辑

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.BeanProperty;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.ser.ContextualSerializer;
import org.apache.shiro.util.StringUtils;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * @Title: JsonFieldPrefix
 * @Description: 返回实体类至前端 , 实体类序列化时追加相应的前缀
 * 主要用于图片url拼接
 * @author: chage
 * @date: 2022/3/25 14:09
 */
public class JsonFieldPrefixSerializer extends JsonSerializer<String> implements ContextualSerializer {

    private String prefix;
    private String splitStr;
    private boolean trimOrNot;
    private boolean arrayOrNot;

    @Override
    public void serialize(String value, JsonGenerator jsonGenerator, SerializerProvider serializers) throws IOException {
        if (!StringUtils.hasText(value)) {
            jsonGenerator.writeString(value);
            return;
        }
        if (StringUtils.hasLength(splitStr)) {
            String[] valueArr = value.split(splitStr);
            List<String> resultList = new ArrayList<>();
            for (String valueItem : valueArr) {
                if (trimOrNot) {
                    valueItem = valueItem.trim();
                }
                resultList.add(prefix + valueItem);
            }
            if(arrayOrNot){
                jsonGenerator.writeArray(resultList.toArray(new String[0]),0,resultList.size());
            }else {
                jsonGenerator.writeString(String.join(splitStr, resultList));
            }
        } else {
            jsonGenerator.writeString(prefix + value);
        }
    }

    @Override
    public JsonSerializer<?> createContextual(SerializerProvider prov, BeanProperty property) throws JsonMappingException {
        JsonFieldPrefix jsonFieldPrefix = property.getAnnotation(JsonFieldPrefix.class);
        if (jsonFieldPrefix != null) {
            prefix = jsonFieldPrefix.value();
            splitStr = jsonFieldPrefix.splitStr();
            trimOrNot = jsonFieldPrefix.trimOrNot();
            arrayOrNot = jsonFieldPrefix.arrayOrNot();
        }
        return this;
    }
}

实体类引用方式:

        @JsonFieldPrefix(Constant.prefix)