没有用于[com.example.blog.SnapEngChatRequest]的HttpMessageConverter和内容类型[application / x-www-form-urlencoded]

Question

我想调用带有表单URL编码标头的post API。这是我的代码

 var data = SnapEngChatRequest(
            widgetId = widgetId,
            visitorMessage = "Test"
    )

    val headers = HttpHeaders()

    headers.set("x-api-key", apiKey)
    headers.set("Content-Type", "application/x-www-form-urlencoded")

    val entity = HttpEntity(data, headers)

    val converter = FormHttpMessageConverter()
    converter.supportedMediaTypes = singletonList(MediaType.APPLICATION_FORM_URLENCODED)
    restTemplate.messageConverters.add(converter)

    val result = restTemplate.exchange(
            url,
            HttpMethod.POST,
            entity,
            String::class.java
    )

但遗憾的是，它无法正常工作，而且我的误差低于此值

No HttpMessageConverter for [com.example.blog.SnapEngChatRequest] and content type [application/x-www-form-urlencoded]
org.springframework.web.client.RestClientException: No HttpMessageConverter for [com.example.blog.SnapEngChatRequest] and content type [application/x-www-form-urlencoded]

在这里，我给了httpMessageConverter，但我不确定它为什么不采取或我不确定我在这里做错了什么。我尽力了。任何帮助都会有所帮助，谢谢！

Answer 1

从FormHttpMessageConverter的文档中可以：

...读取和写入“application / x-www-form-urlencoded”媒体类型为MultiValueMap

所以它无法从POJO中读取它。像这样发送您的数据：

val data = LinkedMultiValueMap(
  mapOf("widgetId" to listOf(widgetId), "visitorMessage" to listOf("Test"))
)