[二维码下载][修改]:修改content type

mallinkAdmin/src/main/java/com/iformall/controller/WxAppinfoController.java

@@ -219,7 +219,7 @@ public class WxAppinfoController extends BaseController {
     private void downFile(String filePath, String filename, HttpServletResponse response, HttpServletRequest req) throws IOException {
         try {
             response.reset();
-            response.setContentType("bin");
+            response.setContentType("image/png");
             String agent = req.getHeader("user-agent");
             if (agent.contains("Firefox")) {
                 response.setHeader("Content-disposition",