Question

我正在尝试使用MonetaryAmount字段作为字符串将Json序列化为POJO，但结果输出不符合规定的形状格式。

// org.javamoney:moneta:1.1 
// com.fasterxml.jackson.core:jackson-annotations:2.7.0
@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonPropertyOrder({
        "CBNOT_CHARGEBACK_AMOUNT"
})
public class TestMonetaryAmountJsonSerialization {
        @JsonProperty("CBNOT_CHARGEBACK_AMOUNT")
        @NotNull
        @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "¤#,##0.00", locale = "en_US")
        private final MonetaryAmount chargebackAmount = Monetary.getDefaultAmountFactory().setCurrency("USD").setNumber(12.50).create();

        private static final ObjectMapper mapper = new ObjectMapper();

        @Test
        public void testThis() throws JsonProcessingException{
            String json = mapper.writeValueAsString(this);
            System.out.println(json);
            Assert.assertEquals("{\"CBNOT_CHARGEBACK_AMOUNT\":\"¤12.50\"}",json);
        }

}

OUTPUT: {"CBNOT_CHARGEBACK_AMOUNT":{"currency":{"context":{"empty":false,"providerName":"java.util.Currency"},"defaultFractionDigits":2,"currencyCode":"USD","numericCode":840},"number":12.5,"factory":{"defaultMonetaryContext":{"precision":0,"fixedScale":false,"amountType":"org.javamoney.moneta.Money","maxScale":63,"empty":false,"providerName":null},"maxNumber":null,"minNumber":null,"amountType":"org.javamoney.moneta.Money","maximalMonetaryContext":{"precision":0,"fixedScale":false,"amountType":"org.javamoney.moneta.Money","maxScale":-1,"empty":false,"providerName":null}},"context":{"precision":0,"fixedScale":false,"amountType":"org.javamoney.moneta.Money","maxScale":63,"empty":false,"providerName":null},"numberStripped":12.5,"zero":false,"negative":false,"negativeOrZero":false,"positive":true,"positiveOrZero":true}}

任何想法我做错了什么？我在这里的代码中扔了厨房水槽，仅用于说明目的和紧凑的演示。

Answer 1

JsonFormat是杰克逊定义的几个（de）序列化程序中使用的注释（例如DateTimeSerializerBase，NumberSerializers.Base和其他一些完整列表here），它不是通用机制将任何对象转换为字符串：

与大多数其他杰克逊注释不同，注释没有具体的通用解释：相反，效果取决于数据类型被注释的财产（或更具体地说，反序列化器和正在使用的序列化器。）

除非您为pattern创建自定义序列化程序或使用使用此注释（以及其MonetaryAmount属性）的自定义序列化程序，否则指定它将没有任何效果，但是如果您创建自定义序列化程序，您可能不需要这种灵活性，以便为不同的字段指定不同的模式，并且可以使用固定的MonetaryAmountFormat或者从@JsonInclude(JsonInclude.Include.NON_NULL) @JsonPropertyOrder({ "CBNOT_CHARGEBACK_AMOUNT" }) public class TestMonetaryAmountJsonSerialization { @JsonProperty("CBNOT_CHARGEBACK_AMOUNT") @NotNull private final MonetaryAmount chargebackAmount = Monetary.getDefaultAmountFactory().setCurrency("USD").setNumber(12.50).create(); private static final ObjectMapper mapper = new ObjectMapper(); static { SimpleModule monetaryModule = new SimpleModule(); monetaryModule.addSerializer(MonetaryAmount.class, new MonetaryAmountSerializer()); mapper.registerModule(monetaryModule); } @Test public void testThis() throws JsonProcessingException { String json = mapper.writeValueAsString(this); System.out.println(json); Assert.assertEquals("{\"CBNOT_CHARGEBACK_AMOUNT\":\"$12.50\"}", json); } public static class MonetaryAmountSerializer extends JsonSerializer<MonetaryAmount> { public void serialize(MonetaryAmount monetaryAmount, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException { StringBuilder sb = new StringBuilder(); MonetaryAmountDecimalFormatBuilder .of("¤#,##0.00").withCurrencyUnit(monetaryAmount.getCurrency()).build() .print(sb, monetaryAmount); jsonGenerator.writeString(sb.toString()); } } }对象构建必要的字符串。

例如

{{1}}

自定义MonetaryAmount JSR354 / moneta的Databind Json序列化格式

1 个答案: