Iterate over HashMap with JSTL
Written by coregps on Friday, July 21st, 2006 in Java.
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I’ve ever written a java bean base on Commons DBUtils, which returns an ArrayList of HashMap results from SQL query. The following is one of my Java Bean:
package database;
import java.util.ArrayList;
import java.util.List;
public class CategoryDBAO {
...
public List getAllCategories() {
ArrayList categoryList = new ArrayList();
try {
String sql = “select categories_id, categories_name from categories”;
attrList = DBConn.searchToMapList(sql);
} catch (Exception e) {
e.printStackTrace();
}
return categoryList;
}
…
}
Many times I need to iterate over the set of the values stored in the map. This can be done like this:
<jsp:useBean id="categoryDB" class="database.CategoryDBAO" scope="page" />
<select name="categories_id" id="categories_id">
<c:forEach var="category" begin="0" items="${categoryDB.allCategories}“>
<c:set var=”categoryid” value=”${category[’categories_id’]}” />
<c:set var=”categoryname” value=”${category[’categories_name’]}” />
<option value=”${categoryid}”>${categoryname}</option>
</c:forEach>
</select>
What should be noted here is the code fragment in red.
