JSTL map<long,?> How to convert a string or integer to a Long

Jstl the value in the map, generally need to be compared to whether it is a key, only take out the value of the map, if the front splicing key is a string or shape, the direct fetch is not out, need to convert, the conversion is very simple, key+0 on the line.

eg

recordentity.key= ' 2014.05.22-1-1 '

<c:set var= "StoreId" value= "${recordentity.key.split ('-') [2]}"/>

This storeid=1 is a string type, and the Storenamemap key is a long type.

${storenamemap[storeid]} This is not taken, you need to convert storeId to long.

The correct fetch method is: ${storenamemap[storeid+0]}, which is also applicable for storeId int type.

JSTL map<long,?> How to convert a string or integer to a Long