kotlin将网络上可以访问的url图片转换成Base64字符串

import java.io.ByteArrayOutputStream
import java.io.IOException
import java.io.InputStream
import java.net.HttpURLConnection
import java.net.URL


fun imgToBase64(path: String): String {
        val data: ByteArray? = null
        var `in`: InputStream? = null
        var out: ByteArrayOutputStream? = null
        try {
            val url = URL(path)
            val connection: HttpURLConnection = url.openConnection() as HttpURLConnection
            connection.setRequestMethod("GET")
            connection.setConnectTimeout(5000)
            connection.setReadTimeout(5000)
            `in` = connection.getInputStream()
            out = ByteArrayOutputStream()
            val b = ByteArray(1024)
            var len = 0
            while (`in`.read(b).also { len = it } != -1) {
                out.write(b, 0, len)
            }
        } catch (e: Exception) {
            e.printStackTrace()
        } finally {
            try {
                `in`?.close()
            } catch (e: IOException) {
                e.stackTrace
            }
        }
        System.out.println("转换后的图片大小：" + out!!.toByteArray().size / 1024)
        val base = BASE64Encoder()
        return base.encode(out.toByteArray()).replace("\n", "").replace("\r", "");
    }