jstl输出HashMap的结果 C:foreach

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 List<String> cityList =newArrayList<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 Map<String, String> countryCapitalList =newHashMap<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>

Happy iterating :-)