sharing data between jsp, bean, servlet

bigDaftie · Sep 25, 2003

Hi
I'm trying to do a simple web app. A jsp with a form fills a beans properties. A servlet then uses that bean data but I can't seem to get it to work.

This is a simplified version.....

my jsp page is as follows
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*" errorPage="" %>
<%@ taglib prefix="c" uri="

http://java.sun.com/jstl/core"

%>
<jsp:useBean id="test" scope="session" class="servletlesson.TestBean" >
<jsp:setProperty name="test" property="*" />
</jsp:useBean>
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<body>
<form method="post" action="test">
<table width="" border="0" cellspacing="" cellpadding="">
<tr>
<td>test</td>
<td><input name="test" type="text" ></td>
</tr>
<tr>
<td><input type="submit" value="Submit" name="submit" ></td>
</tr>
</table>
</form>
</body>
</html>

my bean is
import java.io.*;
public class TestBean implements Serializable{

private String test;

public TestBean() {
}

public void setTest(String aTest){
this.test=aTest;
}

public String getTest(){
return test;
}
}

and my servlet is
public class TestServlet extends HttpServlet {

public void init(){
}//init

public void doPost(HttpServletRequest req, HttpServletResponse res)throws ServletException, IOException{

HttpSession sess=req.getSession();
TestBean test=(TestBean)sess.getAttribute("test&quot

;
PrintWriter out=res.getWriter();
out.println("This is a test "+test.getTest());
}//doPost

}

Am I going about this the wrong way?? Is it wrong to share data between beans and servlets in this way?

All i get from test.getTest() is null whereas I want to return my form value that the user types in.

If anyone can help I'll be eternally grateful.
Thanks a lot,
B

davidyu8888 · Sep 27, 2003

You may consider using session to share information between JSPs and servlets

bigDaftie · Sep 29, 2003

Thanks for getting back to me. I was trying to use the bean because I really like the idea of the lines

<jsp:useBean id="test" scope="session" class="servletlesson.TestBean" >
<jsp:setProperty name="test" property="*" />
</jsp:useBean>

It seems to do all the work for you. I'm not sure what you mean by using session to share the data, cos I thought I was doing that! Do you mean that you can set the form data to have session scope? I know that I can get the form values from doing something like request.getParameter("name of attribute&quot

but I like the idea of storing the data in a bean, maybe putting it in a database, storing it in a cookie etc but calling different servlets that can then all access this one bean. Maybe my bean code is wrong? Any other suggestions? Thanks a lot,
Bruce

bigDaftie · Sep 30, 2003

Ok, solved it!! Got the page to call itself, and then forwarded to the servlet.

<body>
<form method="post" action="test.jsp">
<table width="" border="0" cellspacing="" cellpadding="">
<tr>
<td>test</td>
<td><input type="text" name="test" value="hello there is this working"></td>
</tr>
<tr>
<td><input type="submit" value="Submit" ></td>
</tr>
</table>
</form>
<%
if (request.getMethod().equals("POST&quot) {
%>
<jsp:useBean id="test" scope="session" class="servletlesson.TestBean" >
<jsp:setProperty name="test" property="*" />
</jsp:useBean>
<jsp:forward page="test" />
<%
}
%>
</body>

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sharing data between jsp, bean, servlet

bigDaftie

Programmer

davidyu8888

MIS

bigDaftie

Programmer

bigDaftie

Programmer

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