文件inputstream转base64

文件inputstream转base64的方法可以参考以下代码：

fun inputStreamToBase64(inputStream: InputStream): String {
    val byteArrayOutputStream = ByteArrayOutputStream()
    val buffer = ByteArray(1024)
    var length: Int
    try {
        while (inputStream.read(buffer).also { length = it } != -1) {
            byteArrayOutputStream.write(buffer, 0, length)
        }
        val data = byteArrayOutputStream.toByteArray()
        return Base64.encodeToString(data, Base64.NO_WRAP)
    } catch (e: IOException) {
        e.printStackTrace()
    } finally {
        try {
            inputStream.close()
            byteArrayOutputStream.close()
        } catch (e: IOException) {
            e.printStackTrace()
        }
    }
    return ""
}

这段代码将输入流中的数据读取到字节数组中，然后使用Base64编码将字节数组转换为Base64编码字符串。最后返回转换后的Base64编码字符串。请注意，这里使用的是Android的Base64类，如果是在Java环境中使用，需要使用java.util.Base64类。
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