全局设置

public class CustomerDoubleSerialize extends JsonSerializer {
    private DecimalFormat df = new DecimalFormat("0.00");

    @Override
    public void serialize(Object o, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException {
        if(o.toString() != null && !"-".equals(o)) {
            Double dd=Double.parseDouble(o.toString());

            jsonGenerator.writeString(df.format(dd));

        } else{
            jsonGenerator.writeString(o.toString());

        }
    }
}

在需要使用的实体字段上加上注解即可。@JsonSerialize(using = CustomerDoubleSerialize.class)

实体类加上注解。

@Data
public class SalesVolumeVo {

@JsonSerialize(using = CustomerDoubleSerialize.class)
private String salesVolume1;

}