Question

以下是使用ScalaFX和ZXing生成QR码的代码：

import java.util.{HashMap => JavaHashMap}
import org.apache.commons.codec.binary.Base64

import scalafx.scene.image.{Image, PixelFormat, WritableImage}
import scalafx.scene.paint.Color

import com.google.zxing.common.BitMatrix
import com.google.zxing.qrcode.QRCodeWriter
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel
import com.google.zxing.{BarcodeFormat, EncodeHintType}

object QRCode {

  private val hints = new JavaHashMap[EncodeHintType, Any]() {
    put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L)
  }

  def encode(text: String, size: Int): String = {
    val bitMatrix = new QRCodeWriter().encode(text, BarcodeFormat.QR_CODE, size, size, hints)
    val image = toWritableImage(bitMatrix)
    val bytes = // how do I convert image to a byte array?
    Base64.encodeBase64String(bytes)
  }

  private def toWritableImage(bitMatrix: BitMatrix): WritableImage = {
    val image = new WritableImage(bitMatrix.getWidth, bitMatrix.getHeight)
    val writer = image.getPixelWriter
    val format = PixelFormat.getByteRgbInstance
    for (y <- 0 to (bitMatrix.getHeight - 1); x <- 0 to (bitMatrix.getWidth - 1)) {
      writer.setColor(x, y, if (bitMatrix.get(x, y)) Color.Black else Color.White)
    }
    image
  }
}

由于我需要QR码作为base64字符串，我想知道如何将Image对象转换为字节数组，以便我可以使用Apache的commons-codec将其转换为base64。

Answer 1

使用WritabableImage上的BufferedImage方法将fromFXImage转换为SwingFXUtils。然后可以使用BufferedImage将ImageIO.write写入流中。如果您传入ByteArrayOutputStream，则可以从流中获取byte[]。

ScalaFX：如何将Image对象转换为字节数组

1 个答案: