java.net.MalformedURLException:无协议：[Ljava.lang.String;@f2b1656在试图下载kotlin文件时

Question

想从网站下载一个文件，从https://api.openrouteservice.org/下载json文件，但我得到了以下错误：java.net.MalformedURLException: no protocol: [Ljava.lang.String;@f2b1656

这是代码

 private fun downloadUrl(strUrl: String): String{
        var fullData = ""
        try {
            URL(strUrl).openStream().use { inp ->
                BufferedInputStream(inp).use { bis ->
                        val data = ByteArray(1024)
                        var count: Int
                        while (bis.read(data, 0, 1024).also { count = it } != -1) {
                            fullData += data.toString()
                        }
                    }
                }
        }catch (e: Exception){
            Log.d("DownloadTask", e.toString())

        }
        return fullData

创建url

private fun getDirectionURL(): String{
        val destination: String = coordinates[2].toString() + "," + coordinates[3].toString()
        val origin: String = globalLocation.longitude.toString() + "," + globalLocation.latitude.toString()
        val urlString: String = java.net.URLEncoder.encode("https://api.openrouteservice.org/v2/directions/driving-car?api_key=5***&start=" + origin + "&end=" + destination, "UTF-8")
        Log.d("urlCreate", urlString)
        return urlString
    }

url正在工作，我在浏览器中检查了它。

Answer 1

您的问题在val urlString: String中。

可以使用字符串内插来正确构建URL，也可以使用Android方法使用URI生成器和

appendPath(字符串)

appendQueryParameter(Param and Value)。

https://developer.android.com/reference/android/net/Uri.Builder

Answer 2

java.net.URLEncoder.encode(yourUrl).toString()将返回：

https%3A%2F%2Fapi.openrouteservice.org%2Fv2%2Fdirections%2Fdriving-car%3Fapi_key%3D5***%26start%3D2%2C3%26end%3D2%2C3java.net.MalformedURLException:无协议: https%3A%2F%2Fapi.openrouteservice.org%2Fv2%2Fdirections%2Fdriving-car%3Fapi_key%3D5***%26start%3D2%2C3%26end%3D2%2C3

我并不是说您需要用URLEncoder对象覆盖您的url。只要把你的网址还回去就行了。

private fun getDirectionURL(): String{
    val destination: String = coordinates[2].toString() + "," + coordinates[3].toString()
    val origin: String = globalLocation.longitude.toString() + "," + globalLocation.latitude.toString()
    val urlString: String = "https://api.openrouteservice.org/v2/directions/driving-car?api_key=5***&start=$origin&end=$destination"
    Log.d("urlCreate", urlString)
    return urlString
}