Write a large Inputstream to File in Kotlin

Question

I have a large stream of text coming back from REST web service and I would like to write it directly to file. What is the simplest way of doing this?

I have written the following function extension that WORKS. But I can't help thinking that there is a cleaner way of doing this.

Note: I was hoping to use try with resources to auto close the stream and file

fun File.copyInputStreamToFile(inputStream: InputStream) {     val buffer = ByteArray(1024)      inputStream.use { input ->         this.outputStream().use { fileOut ->              while (true) {                 val length = input.read(buffer)                 if (length <= 0)                     break                 fileOut.write(buffer, 0, length)             }             fileOut.flush()         }     } } 

Answer 1

You can simplify your function by using the copyTo function:

fun File.copyInputStreamToFile(inputStream: InputStream) {     this.outputStream().use { fileOut ->         inputStream.copyTo(fileOut)     } }