@RequestMapping(“/makeQrCode”)
public void madeQrCode(HttpServletResponse res,String content,Integer width,Integer height) throws IOException{

    String format = "png";
    content = (content == null || "".equals(content) ? "http://www.manjiwang.com" : content);
    width = (width == null ? 300 : width);
    height = (height == null ? 300 : height);
    System.out.println(content);
    System.out.println(width);
    System.out.println(height);
    if(content != null && !"".equals(content)){
        ServletOutputStream stream = null;
    try {
        //定義二維碼的引數
        HashMap hints = new HashMap();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.MARGIN, 2);
        //生成二維碼
        stream = res.getOutputStream();
        BitMatrix bitMatrix = new QRCodeWriter().encode(content, BarcodeFormat.QR_CODE, width, height , hints);
        MatrixToImageWriter.writeToStream(bitMatrix, format, stream);
    } catch (WriterException e) {
        e.printStackTrace();
    }finally{
        if(stream != null){
            stream.flush();
            stream.close();
        }
    }

}
}
 

前端頁面接收

$(“#image”).attr(“src”,”/backstage/makeQrCode?content=”+content+”&width=”+width+”&height=”+height);