..

src/main/java/io/renren/modules/app/controller/QRCodeTest.java

    @GetMapping("qcodetest.jpg")
    @ApiOperation("获取二维码图片")
    public void  getCodeImg(HttpServletResponse response, String text){
    public void  getCodeImg(HttpServletResponse response, String text)throws IOException {
        response.setHeader("Cache-Control", "no-store, no-cache");
		response.setContentType("image/jpeg");