MP_二维码管理

获得二维码ticket

// 临时ticket
WxMpQrCodeTicket ticket = wxMpService.qrCodeCreateTmpTicket(scene, expire_seconds);
// 永久ticket
WxMpQrCodeTicket ticket = wxMpService.qrCodeCreateLastTicket(scene);

换取二维码图片

WxMpQrCodeTicket ticket = ...;
// 获得一个在系统临时目录下的文件，是jpg格式的
File file = wxMpService.qrCodePicture(ticket);