Kotlin http4k:如何从响应的主体中获取json字段

Question

下面显示了http4k JavaHttpClient的响应主体：'｛"哈希"："QmbFMke1KXqnYyBBWxB74N4c5SBnJMVAiMNRcGu6x1AwQH"，"大小"：0，"累积大小"：6，"块"：0、"类型"："文件"｝

哪个Kotlin模块可以用于提取字段"Hash"Size"Blocks"Type"的值？

Answer 1

您需要添加一个受支持的JSON模块：

// Argo:  
implementation group: "org.http4k", name: "http4k-format-argo", version: "4.33.1.0"
// Gson:  
implementation group: "org.http4k", name: "http4k-format-gson", version: "4.33.1.0"
// Jackson: 
implementation group: "org.http4k", name: "http4k-format-jackson", version: "4.33.1.0"
// Klaxon: 
implementation group: "org.http4k", name: "http4k-format-klaxon", version: "4.33.1.0"
// Moshi: 
implementation group: "org.http4k", name: "http4k-format-moshi", version: "4.33.1.0"
// KotlinX Serialization: 
implementation group: "org.http4k", name: "http4k-format-kotlinx-serialization", version: "4.33.1.0"

然后你可以用类似的方式提取字段：

import org.http4k.core.Response
import org.http4k.core.Status
import org.http4k.format.Jackson.asJsonObject
val body = """
{"Hash":"QmbFMke1KXqnYyBBWxB74N4c5SBnJMVAiMNRcGu6x1AwQH","Size":0,"CumulativeSize":6,"Blocks":0,"Type":"file"}
""".trimIndent()
val response = Response(Status.OK).body(body)
response.bodyString().asJsonObject().let {
require(it.get("Hash").textValue() == "QmbFMke1KXqnYyBBWxB74N4c5SBnJMVAiMNRcGu6x1AwQH")
require(it.get("Size").intValue() == 0)
require(it.get("CumulativeSize").intValue() == 6)
require(it.get("Blocks").intValue() == 0)
require(it.get("Type").textValue() == "file")
println(it.get("Hash").textValue())
}

此处提供了一些文档：https://www.http4k.org/api/org.http4k.format/-json/

Answer 2

使用Klaxon

build.gradle.kts:

implementation("com.beust:klaxon:5.0.1")

kotlin模块：

import com.beust.klaxon.Klaxon
data class MyData(val name: String)
val result = Klaxon().parse<MyData>("""
{ "name": "John Doe",} 
""")
val name = result?.name

给出"John Doe">