生成二维码

@RequestMapping(value="/getMatrix",method = {RequestMethod.POST,RequestMethod.GET})
public void matrix(String id,ApiPrincipal apiPrincipal,HttpServletResponse response){
try {
OutputStream stream = null;
response.setHeader("Content-Type", "image/png");
response.setContentType("png");
stream = response.getOutputStream();

MultiFormatWriter multiFormatWriter = new MultiFormatWriter();

Map<EncodeHintType,String> hints = new HashMap<EncodeHintType,String>();
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");

//扫码之后访问地址
BitMatrix bitMatrix = multiFormatWriter.encode("http://www.xxx.com/xxx/index?id="+id, BarcodeFormat.QR_CODE, 400, 400, hints);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
MatrixToImageWriter.writeToStream(bitMatrix, "png", baos);

stream.write(baos.toByteArray());
stream.flush();
stream.close();
} catch (Exception e) {
}

}

 

//二维码生成工具类

public class MatrixToImageWriter {

private static final int BLACK = 0xFF000000;
private static final int WHITE = 0xFFFFFFFF;

private MatrixToImageWriter() {
}

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 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);
}
}

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 main(String[] args) {
try {
MultiFormatWriter multiFormatWriter = new MultiFormatWriter();

Map hints = new HashMap();
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
BitMatrix bitMatrix = multiFormatWriter.encode("http://www.baidu.com", BarcodeFormat.QR_CODE, 400, 400, hints);

/*ByteArrayOutputStream baos = new ByteArrayOutputStream();
MatrixToImageWriter.writeToStream(bitMatrix, "png", baos);
System.out.println(baos.toByteArray().toString());*/

File file1 = new File("D:/", "qrcode.jpg");
MatrixToImageWriter.writeToFile(bitMatrix, "jpg", file1);

} catch (Exception e) {
}
}