如何使用 fastxml 将 kotlin 数据类转换为 xml？

Question

我有一个想要序列化为 xml 的 kotlin 数据类。我正在使用杰克逊 Fasterxml。但是，当我序列化该类时，JacksonXmlProperty 被忽略，因此没有提供所需的输出。这是我正在处理的数据类。

@JacksonXmlRootElement(localName = "COMMAND")
data class Request(
        @JacksonXmlProperty(localName = "TYPE")
        val type: String,

        @JacksonXmlProperty(localName = "INTERFACEID")
        val interfaceId: String,

        @JacksonXmlProperty(localName = "MSISDN")
        val msisdn: String,

        @JacksonXmlProperty(localName = "MSISDN2")
        val msisdn2: String,

        @JacksonXmlProperty(localName = "AMOUNT")
        val amount: Int,

        @JacksonXmlProperty(localName = "MEMO")
        val memo: String,

        @JacksonXmlProperty(localName = "EXTTRID")
        val externalTxnId: String,

        @JacksonXmlProperty(localName = "MERCHANT_TXN_ID")
        val merchantTxnId: String,

        @JacksonXmlProperty(localName = "IS_TRANS_UNIQUE_CHECK_REQUIRED")
        val isUnique: String = "Y",

        @JacksonXmlProperty(localName = "REFERENCE")
        val reference: String,

        @JacksonXmlProperty(localName = "serviceType")
        val serviceType: String,

        @JacksonXmlProperty(localName = "USERNAME")
        val username: String,

        @JacksonXmlProperty(localName = "PASSWORD")
        val password: String
)

我得到的响应忽略了 JacksonXmlProperty：

<COMMAND>
  <serviceType>MERCHPAY</serviceType>
  <type>MERCHPAY</type>
  <interfaceId>DATABUNDLES</interfaceId>
  <msisdn>733204938</msisdn>
  <msisdn2>100001929</msisdn2>
  <amount>1000</amount>
  <memo>Enter the PIN for payment of 1000 to purchase testing transaction</memo>
  <externalTxnId>07026984141550752666</externalTxnId>
  <merchantTxnId>07026984141550752666</merchantTxnId>
  <reference>Testing transaction</reference>
  <username>abcd</username>
  <password>abcd123</password>
</COMMAND>

Answer 1

使用 fasterxml 将 kotlin 数据类转换为 xml

1. 确保添加对 pom 的依赖

        <dependency>
            <groupId>com.fasterxml.jackson.dataformat</groupId>
            <artifactId>jackson-dataformat-xml</artifactId>
            <version>2.10.1</version>
        </dependency>

1. 在数据类上添加@field，这样@JacksonXmlProperty就不会被忽略

@JacksonXmlRootElement(localName = "COMMAND")
data class AirtelExpressRequest(
        @field:JacksonXmlProperty(localName = "TYPE")
        val type: String,

        @field:JacksonXmlProperty(localName = "INTERFACEID")
        val interfaceId: String,

        @field:JacksonXmlProperty(localName = "MSISDN")
        val msisdn: String,

        @field:JacksonXmlProperty(localName = "MSISDN2")
        val msisdn2: String,

        @field:JacksonXmlProperty(localName = "AMOUNT")
        val amount: Int,

        @field:JacksonXmlProperty(localName = "MEMO")
        val memo: String,

        @field:JacksonXmlProperty(localName = "EXTTRID")
        val externalTxnId: String,

        @field:JacksonXmlProperty(localName = "MERCHANT_TXN_ID")
        val merchantTxnId: String,

        @field:JacksonXmlProperty(localName = "IS_TRANS_UNIQUE_CHECK_REQUIRED")
        val isUnique: String = "Y",

        @field:JacksonXmlProperty(localName = "REFERENCE")
        val reference: String,

        @field:JacksonXmlProperty(localName = "serviceType")
        val serviceType: String,

        @field:JacksonXmlProperty(localName = "USERNAME")
        val username: String,

        @field:JacksonXmlProperty(localName = "PASSWORD")
        val password: String
)

1. 使用XmlMapper，您可以继续将数据类序列化为xml

 val xmlMapper = XmlMapper(
                JacksonXmlModule().apply { setDefaultUseWrapper(false) }
        ).apply {
                enable(SerializationFeature.INDENT_OUTPUT)
        }
val strObject = Request(
                type            = "MERCHPAY",
                interfaceId     = "DATABUNDLES",
                msisdn          = "733204938",
                msisdn2         = "100001929",
                amount          = 1_000,
                externalTxnId   = "07026984141550752666",
                merchantTxnId   = "07026984141550752666",
                reference       = "Testing transaction",
                memo            = "Enter the PIN for payment of 1000 to purchase testing transaction",
                serviceType     = "MERCHPAY",
                username        = "abcd",
                password        = "abcd123"
        )
        val xml = xmlMapper.writeValueAsString(strObject)

4. 输出

<COMMAND>
  <TYPE>MERCHPAY</TYPE>
  <INTERFACEID>DATABUNDLES</INTERFACEID>
  <MSISDN>733204938</MSISDN>
  <MSISDN2>100001929</MSISDN2>
  <AMOUNT>1000</AMOUNT>
  <MEMO>Enter the PIN for payment of 1000 to purchase testing transaction</MEMO>
  <EXTTRID>07026984141550752666</EXTTRID>
  <MERCHANT_TXN_ID>07026984141550752666</MERCHANT_TXN_ID>
  <IS_TRANS_UNIQUE_CHECK_REQUIRED>Y</IS_TRANS_UNIQUE_CHECK_REQUIRED>
  <REFERENCE>Testing transaction</REFERENCE>
  <serviceType>MERCHPAY</serviceType>
  <USERNAME>abcd</USERNAME>
  <PASSWORD>abcd123</PASSWORD>
</COMMAND>