questionnaire
allow check questionnaire answers
support statistics
fix bug
limit
get wechat user info; use thymeleaf template
refactor code; javascript logic to send post request
vote counting record
write user info to local file
load vote content from file
Big refactoring
fix bug
Server Send Event to update counting
update counting
support multiple vote contents, and reduce memory leak possibility
Try to support audio file
support mp3 file
add video support
width
add index page to list all the vote contents