kotlin - 如何用数据类发表文章

Question

我有这个结构的端点:

uri = http://127.0.0.1:9090/tables/mask

和这个有效载荷:

{
   "_id" : "5d66c9b6d5ccf30bd5b6b541",
   "connectionId" : "1967c072-b5cf-4e9e-1c92-c2b49eb771c4",
   "name" : "Customer",
   "columns" : [
       {
           "name" : "FirstName",
           "mask" : true
       },
       {
           "name" : "LastName",
           "mask" : false
       },
       {
           "name" : "City",
           "mask" : false
       },
       {
           "name" : "Phone",
           "mask" : false
       }
   ],
   "parentId" : null
} 

在我的Kotlin代码中，我具有以下要反序列化的结构:

data class ColumnsMaskModel (val name:String, val mask:Boolean )

data class TablesMaskModel (val _id:String, val name:String, val connectionId:String, val columns:MutableList<ColumnsMaskModel?> )

以及如何使用TablesMaskModel在Kotlin中进行HTTP发布

Answer 1

您将需要一个HTTP客户端来执行此操作。数据类本身与HTTP无关，它们只是数据结构。 Kotlin上有许多用于JVM的HTTP客户端:

java.net.HttpURLConnection

Java 9的HttpClient

Apache HttpComponents

OkHttp

Ktor

让我们看看如何在Ktor中发出HTTP请求:

data class ColumnsMaskModel(val name: String, val mask: Boolean)

data class TablesMaskModel(val _id: String, val name: String, val connectionId: String, val columns: MutableList<ColumnsMaskModel?>)

fun main() = runBlocking {
    val client = HttpClient {
        install(JsonFeature) {
            serializer = JacksonSerializer()
        }
    }

    val result = client.post<String> {
        url("http://httpbin.org/post")
        contentType(ContentType.Application.Json)
        body = TablesMaskModel(
            _id = "5d66c9b6d5ccf30bd5b6b541",
            connectionId = "1967c072-b5cf-4e9e-1c92-c2b49eb771c4",
            name = "Customer",
            columns = mutableListOf(
                ColumnsMaskModel(name = "FirstName", mask = true),
                ColumnsMaskModel(name = "LastName", mask = false),
                ColumnsMaskModel(name = "City", mask = false),
                ColumnsMaskModel(name = "Phone", mask = false)
            )
        )
    }

    println(result)

    client.close()
}

请注意，Ktor对HTTP请求使用了挂起函数，因此您需要一个协程作用域，在此示例中为runBlocking。

Ktor支持HTTP客户端的各种“后端” – Apache，Coroutines IO，curl。它也具有不同的“功能”以实现对运行中的有效载荷进行序列化和反序列化，如上面的示例所示。