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JSP get Parameter

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JSP get Parameter is used to return the value of a request parameter passed as query string and posted data which is encoded in the body of request.

JSP get Parameter

        

JSP get Parameter is used to return the value of a request parameter passed as query string and posted data which is encoded in the body of request.

Syntax JSP get Parameter:

<%= request.getParameter("name") %>

Understand with Example

In this section, you will learn how to get the parameters using the method request.getParameter(). This method is provided by the interface ServletRequest which returns the value of a request parameter as a String, or null if the parameter does not exist. You can see in the given example that we prompt the user to enter the name and address in the provided text fields. Then on clicking the button, the method request.getParameter() retrieves the passed parameters and displays the value of the parameters on the browser. 

Here is the code of getParameter.jsp

<html>
<body>
<form method="post" action="getParameter.jsp" >
<table>
<tr><td>
Enter your Name:</td><td><input type="text" size="20" name="name"/></td></tr><tr><td>
Enter your Address:</td><td><input type="text" size="20" name="address"/><br></td></tr><tr><td>
<input type="submit" value="Get Parameter"/></td></tr>
<%
if (request.getParameter("name") == null&&request.getParameter("address") == null) {
out.println("Please enter the fields.");
} else {%>
<tr><td><%
out.println("Name: <b>"+request.getParameter("name")+"</b>!"+"<br>");
out.println("Address: <b>"+request.getParameter("address")+"</b>!");
}
%>
</td></tr>
</table>
</form>
</body>
</html>

Output will be displayed as:

After entering the fields, click the button:

On clicking the button, the value of the request parameters will be displayed:

Download Source Code:

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Posted on: February 4, 2009

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nguy?n ?ức nghĩa
February 15, 2012
thanks

i'm try to study jsp... thanks for this ex ... ^^
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