fix http request send wrong encoding bug
update tomcat web.xml
add html test pages
combine ResourceHandler and servletHandler together
remove unused charset setup
import optimize
Revert "remove unused charset setup"

This reverts commit d09334596ea69c87b035ab47c6dfbfdecf33e3ce.
RandomString return more comfortable string
use String instead of byte[] as idBytes.

for fast id lookup, hashCode is needed,
wrap byte[] as IdBytes type is not easy
add userName idByteString constructor to ClientUserInfo
fix OnlineUserInfoMap test