1 | initial version |
The process of utilizing an HTTP request to transfer an image to a server using Kotlin involves the following steps:
Here's some sample code in Kotlin that illustrates these steps:
val url = URL("http://example.com/upload")
val connection = url.openConnection() as HttpURLConnection
connection.requestMethod = "POST"
connection.doOutput = true
connection.doInput = true
connection.useCaches = false
val boundary = "*****"
val contentType = "multipart/form-data;boundary=$boundary"
connection.setRequestProperty("Content-Type", contentType)
val outputStream = DataOutputStream(connection.outputStream)
outputStream.writeBytes("--$boundary\r\n")
outputStream.writeBytes("Content-Disposition: form-data; name=\"image\"; filename=\"image.png\"\r\n")
outputStream.writeBytes("Content-Type: image/png\r\n\r\n")
val fileInputStream = FileInputStream(file)
val buffer = ByteArray(1024)
var bytesRead: Int = fileInputStream.read(buffer)
while (bytesRead != -1) {
outputStream.write(buffer, 0, bytesRead)
bytesRead = fileInputStream.read(buffer)
}
outputStream.writeBytes("\r\n--$boundary--\r\n")
fileInputStream.close()
outputStream.flush()
outputStream.close()
val responseCode = connection.responseCode
if (responseCode == HttpURLConnection.HTTP_OK) {
val inputStream = connection.inputStream
val reader = BufferedReader(InputStreamReader(inputStream))
val response = reader.readText()
reader.close()
inputStream.close()
}