Iterating through an ArrayList of HashMaps?

[nobr]Based on this example:

MyBeanpublic List< Map<String, String> > getArrayList() {

List< Map<String, String> > arrayList = new ArrayList< Map<String, String> >();

Map<String, String> map1 = new HashMap<String, String>();

map1.put("key1", "value1a");

map1.put("key2", "value2a");

arrayList.add(map1);

Map<String, String> map2 = new HashMap<String, String>();

map2.put("key1", "value1b");

map2.put("key2", "value2b");

arrayList.add(map2);

return arrayList;

}

If you know the key names before:<c:forEach items="${myBean.arrayList}" var="hashMap">

key1 value: <c:out value="${hashMap.key1}" />

key2 value: <c:out value="${hashMap.key2}" />

<br />

</c:forEach>

If you don't know the key names before and just want all entries:<c:forEach items="${myBean.arrayList}" var="hashMap">

<c:forEach items="${hashMap}" var="entry">

key: <c:out value="${entry.key}" />

value: <c:out value="${entry.value}" />

<br />

</c:forEach>

<br />

</c:forEach>

Note: remove spaces from generic type parameter if you're about to copypasting this. This forum doesn't parse nested < and > tags correctly.[/nobr]

BalusCa at 2007-7-12 23:54:58 >

The standard for a forEach loop is

<c:forEach var="item" items="${myListOfItems}>

Given your description above myBean IS an List (extends ArrayList) of HashMaps. So the expression should be ${myBean} rather than ${myBean.arrayList}

<c:forEach var="hashMap" items="${myBean}" >

This loop is saying go through the list "myBean", and on each iteration store the value in the variable "hashMap"

Inside this loop, you no longer need to refer to "myBean" but just to the element "hashMap".

evnafetsa at 2007-7-12 23:54:58 >