JavaServer Tag library is one of the most used JSP tag library out there. I have used it almost in all of my JEE based projects. The best feature probably is the Iterator API in JSTL tag library.

Here is a small code snippet which you might not know. Its very easy to iterate Lists using JSTL. For example:

 

 Java Code By TONY

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//Java List< String > cityList =  new  ArrayList< String >(); cityList.add( "Washington DC" ); cityList.add( "Delhi" ); cityList.add( "Berlin" ); cityList.add( "Paris" ); cityList.add( "Rome" );   request.setAttribute( "cityList" , cityList);     //JSP <c:forEach var= "city"  items= "cityList" >     <b> ${city} </b> </c:forEach>

But what if you want to iterate a Hashmap? Well that too is piece of cake. Here is the example:

 

 Java Code By TONY

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//Java Map< String ,  String > countryCapitalList =  new  HashMap< String ,  String >(); countryCapitalList.put( "United States" ,  "Washington DC" ); countryCapitalList.put( "India" ,  "Delhi" ); countryCapitalList.put( "Germany" ,  "Berlin" ); countryCapitalList.put( "France" ,  "Paris" ); countryCapitalList.put( "Italy" ,  "Rome" );           request.setAttribute( "capitalList" , countryCapitalList);   //JSP <c:forEach var= "country"  items= "${capitalList}" >     Country: ${country.key}  - Capital: ${country.value} </c:forEach>