How do use c:forEach JSTL tag?

Category: taglib / jstl, viewed: 979 time(s).

The c:forEach tag in the core JSTL tag library is a useful tag when we want to iterate over a collection of data such as array. It is commonly use to render a tabular data in our web pages in form of HTML table.

In the example below we display a weather data that we stored as two dimensional array of string. After declaring and initializing the data with some value we put it into the request scope. Later on the c:forEach tag can use the data, iterates it row by row to form an HTML table. Our weather data consist of the date, condition and the high and low temperature.

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<html>
<head>
    <title>Weather Page</title>
</head>
<body>
<%
    String[][] data = {
            {"Nov 6", "Sunny", "32", "26"},
            {"Nov 7", "Sunny", "32", "26"},
            {"Nov 8", "Sunny", "32", "26"},
            {"Nov 9", "Partly Cloudy", "32", "26"},
            {"Nov 10", "Isolated T-Storms", "32", "26"}
    };
    request.setAttribute("weathers", data);
%>
<strong>5-Days Weather for Denpasar, Indonesia</strong>

<table border="1">
    <tr>
        <th>DATE</th>
        <th>CONDITION</th>
        <th>TEMP. HIGH</th>
        <th>TEMP. LOW</th>
    </tr>
    <c:forEach var="weather" items="${weathers}">
        <tr>
            <td>${weather[0]}</td>
            <td>${weather[1]}</td>
            <td align="center">${weather[2]}&#8451;</td>
            <td align="center">${weather[3]}&#8451;</td>
        </tr>
    </c:forEach>
</table>
</body>
</html>

Our JSP page above creates the following output:

5-Days Weather for Denpasar, Indonesia
DATE CONDITION TEMP. HIGH TEMP. LOW
Nov 6 Sunny 32℃ 26℃
Nov 7 Sunny 32℃ 26℃
Nov 8 Sunny 32℃ 26℃
Nov 9 Partly Cloudy 32℃ 26℃
Nov 10 Isolated T-Storms 32℃ 26℃
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