通过注解形式格式化Bigdecimal数据格式

1、新建类BigDecimalSerializer

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

public class BigDecimalSerializer extends JsonSerializer<BigDecimal> {
    @Override
    public void serialize(BigDecimal value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
        if (value != null) {
            // 保留5位小数，四舍五入
            BigDecimal number = value.setScale(3, RoundingMode.HALF_UP);
            gen.writeNumber(number);
        } else {
            gen.writeNumber(value);
        }

    }
}

2、实体类的Bigdecimal类型的字段使用@JsonSerialize(using = BigDecimalSerializer.class) 注解