Sử dụng Velocity Engine trong File Template để gen file:

API Ref: https://velocity.apache.org/engine/1.4/api/org/apache/velocity/util/StringUtils.html

1. Chuyển FOO_BAR -> fooBar
   

## $FIELD_NAME is something like 'FOO_BAR'
#set($CAMEL = ${StringUtils.firstLetterCaps($FIELD_NAME)}) ## Foo_bar
#set($CAMEL = ${StringUtils.removeAndHump($CAMEL)}) ## FooBar
#set($UCAMEL = $CAMEL) ## FooBar
#set($CAMEL = $CAMEL.substring(0,1).toLowerCase()+$CAMEL.substring(1)) ## fooBar