Way To J2ee Developer: Hidden jsp

JSP Hidden Form Field

Introduction:

From this post, we will understand the session management using Hidden Form Field. HTML form support input elements with type of Hidden.

Example:

&lt input type=”Hidden” name=”username” value=”sureshkumar”/ &gt

From example, the hidden filed’s value such as sureshkumar is passed with HTTP request. From the next page, we get this value by using request.getParameter() method.

Problem:

A.jsp file have one textbox to get Firstname.

B.jsp file have one textbox to get Lastname.

Result.jsp file display or print Firstname and Lastname.

Solution:

Already we have seen this program without session. So we only B.jsp form value. We get A.jsp value as null.

Procedure:

Step1:

Create Project name SessionHidden(Already we have seen how to create project for web development)

Step 2:

Create Folder named jsp to save jsp files.

Step 3:

Create jsp file named A.jsp

A.jsp have one textbox and button.

Screenshot

Create another jsp file named B.jsp

Screenshot

Step 4:

Include following coding into A.jsp

< %@page contentType="text/html" pageEncoding="UTF-8"% >
< !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
http://www.w3.org/TR/html4/loose.dtd >

< html >
< head >
< title > A JSP Page < /title >
< /head >
< body >
< form method="post" action=http://localhost:8084/SessionHidden/Jsp/B.jsp >
Firstname < input type="text" name="fname"/ >
< input type="submit" value="OK"/ >
< /form >
< /body >
< /html >

Step 5:

Include following coding into B.jsp

< %@page contentType="text/html" pageEncoding="UTF-8"% >
< !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
http://www.w3.org/TR/html4/loose.dtd >

< html >
< head >
< title > B JSP Page < /title >
< /head >
< body >
< %
String fname=request.getParameter("fname");
% >
< form method="post" action=http://localhost:8084/SessionHidden/Jsp/Result.jsp >
Lastname < input type="text" name="lname"/ >
< input type="hidden" name="fname" value=" < %= fname % > " / >
< input type="submit" value="OK"/ >
< /form >
< /body >
< /html >

Step 6:

Include following coding into Result.jsp

< %@page contentType="text/html" pageEncoding="UTF-8"% >
< !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
http://www.w3.org/TR/html4/loose.dtd >

< html >
< head >

< title > Result JSP Page < /title >
< /head >
< body >
< %

String firstname=request.getParameter("fname");
String lastname=request.getParameter("lname");
out.println("FirstName: "+firstname);
out.println("< br > ");
out.println("LastName: "+lastname);

% >
< /body >
< /html >

Step 7:

Run the A.jsp

Screenshot of A.jsp