jstl function fmt
숫자 : <fmt:formatNumber value="12345.678" type="number"/><br/> 통화 : <fmt:formatNumber value="12345.678" type="currency" currencySymbol="$"/><br/> 백분율 : <fmt:formatNumber value="12345.678" type="percent"/><br/> 소수이하 : <fmt:formatNumber value="12345.678" pattern="#,##0.0"/><br/> JSTL tag ex) : https://ahnsk39.blogspot.com/2017/08/jstljsp-standard-tag-library.html