How to display request parameters in a JSP coming in a request ?.

Program to demonstrate how to display request parameters in a JSP coming in a request

request.jsp


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<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>User Information</title>
</head>
<body>

    <form action="entry.jsp" method="get">
        <table cellspacing="0" cellpadding="5" border="1">
            <tr>
                <td align="right">First Name :</td>
                <td><input type="text" name="firstName"></td>
            </tr>
            <tr>
                <td align="right">Last Name :</td>
                <td><input type="text" name="lastName"></td>
            </tr>
            <tr>
                <td align="right">Email Address :</td>
                <td><input type="text" name="emailAddress"></td>
            </tr>

            <tr>
                <td align="right">Gender :</td>
                <td><input type="checkbox" name="male" value="Male" checked>Male</td>

            </tr>
            <tr>
                <td align="right"></td>
                <td><input type="checkbox" name="female" value="Female">Female</td>
            </tr>

            <tr>
                <td align="right">Favorite Hobbies :</td>
                <td><input type="radio" name="hobby" value="TV">TV</td>
            </tr>

            <tr>
                <td align="right"></td>
                <td><input type="radio" name="hobby" value="MOVIES">MOVIES</td>
            </tr>

            </tr>

            <tr>
                <td align="right">Select a country ...</td>
                <td><select name="country" multiple>
                        <option value="USA" selected>United States
                        <option value="CANADA">Canada
                        <option value="INDIA">India
                </select></td>
            </tr>

            <tr>
                <td></td>
                <td align="left"></br> <input type="submit" value="Submit"></td>
            </tr>

        </table>
    </form>

</body>
</html>


entry.jsp


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<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>User Information</title>
</head>
<body>

    <h2>
        Hello Friends !!! ....<br> Below are the important methods of
        request<br> object for the coming parameters ...
    </h2>

    <hr>

    <h2>1. request.getParameter(String param)</h2>
    <h3>
        String firstName = request.getParameter("firstname"); : <br>
        returns the value of html/jsp element submitted in the form <br>
        having name attribute as firstname
    </h3>
    <%
        String firstName = request.getParameter("firstName");
    %>
    <h5>
        First Name :
        <%=firstName%>
    </h5>
    </h3>
    <hr>
    <h2>2. request.getParameterValues(String param)</h2>
    <h3>
        String[ ] countries = request.getParameterValues("country"); : <br>
        returns an array of string values of html/jsp element submitted in the
        form <br> having name attribute as country
    </h3>
    <%
        String[] countries = request.getParameterValues("country");
        for(int i = 0; i < countries.length; i++) {
    %>
    <h5>
        Country :
        <%=i + 1%>
        <%=countries[i]%></h5>

    <%
        }
    %>

    <hr>
    <h2>3. request.getParameterNames()</h2>
    <h3>
        Enumeration countries = request.getParameterNames()); : <br>
        returns an Enumeration of parameter names of html/jsp element
        submitted <br>in the form having name attribute as country
    </h3>
    <%
        java.util.Enumeration params = request.getParameterNames());
        while(params.hasMoreElements())) {
            String paramName = (String) params.nextElement();
            String paramValue = request.getParameter(paramName);
    %>

    <h5><%=paramName%>
        has a value
        <%=paramValue%></h5>

    <%
        }
    %>
    <hr>

</body>
</html>

Output on the browser window :


request.jsp






























entry.jsp