我們可以生成自己的微信二維碼：

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Hashtable;
?
import javax.imageio.ImageIO;
?
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
?
public class QREncode {
?? ?
? ?private static final int BLACK = 0xFF000000;?
? ?private static final int WHITE = 0xFFFFFFFF;?
? ??
? ?private QREncode() {}?
? ??
? ? ??
? ?public static BufferedImage toBufferedImage(BitMatrix matrix) {?
? ? ?int width = matrix.getWidth();?
? ? ?int height = matrix.getHeight();?
? ? ?BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);?
? ? ?for (int x = 0; x < width; x++) {?
? ? ? ?for (int y = 0; y < height; y++) {?
? ? ? ? ?image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);?
? ? ? ?}?
? ? ?}?
? ? ?return image;?
? ?}?
? ??
? ? ??
? ?public static void writeToFile(BitMatrix matrix, String format, File file)?
? ? ? ?throws IOException {?
? ? ?BufferedImage image = toBufferedImage(matrix);?
? ? ?if (!ImageIO.write(image, format, file)) {?
? ? ? ?throw new IOException("Could not write an image of format " + format + " to " + file);?
? ? ?}?
? ?}?
? ??
? ? ??
? ?public static void writeToStream(BitMatrix matrix, String format, OutputStream stream)?
? ? ? ?throws IOException {?
? ? ?BufferedImage image = toBufferedImage(matrix);?
? ? ?if (!ImageIO.write(image, format, stream)) {?
? ? ? ?throw new IOException("Could not write an image of format " + format);?
? ? ?}?
? ?}
? ?@SuppressWarnings({ "unchecked", "rawtypes" })
public static void main(String[] args) throws Exception {?
? ? ? ?String text = "http://weixin.qq.com/r/h685IaDEkf3ureRC9-qV";
? ? ? ?int width = 300;?
? ? ? ?int height = 300;?
? ? ? ?String format = "png";?
? ? ? ?Hashtable hints = new Hashtable();?
? ? ? ?hints.put(EncodeHintType.CHARACTER_SET, "utf-8");?
? ? ? ?BitMatrix bitMatrix = new MultiFormatWriter().encode(text,?
? ? ? ? ? ? ? ?BarcodeFormat.QR_CODE, width, height, hints);?
? ? ? ?File outputFile = new File("d:"+File.separator+"qr.png");?
? ? ? ?QREncode.writeToFile(bitMatrix, format, outputFile);?
? ?}?
}

jar包及目錄文檔：

?

運行結果：

?jar包及源碼：QREncode

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原文地址：https://blog.csdn.net/u012534326/article/details/53863729

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