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access same variable in multiple jsp pages

Posted on 2004-04-04
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Last Modified: 2010-04-01
Hi,This is a basic form contained in form.jsp.
<form name="Form1" method="POST" action="new.jsp">

In new.jsp im using this line to access the variable name from form.jsp.
 String Name = request.getParameter("Name");

How can I access the variable name from other jsp pages?
Thanks.
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Question by:Ronayne
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Expert Comment

by:copyPasteGhost
Comment Utility
I would suggest to make a simple Java Bean and then read in the values from there.

MyBean.java ...

package myPackage;

public class MyBean {
  private String name;
  public MyBean() {
    name = "";
  }
  public String getName() {
    return name;
  }
 
  public void setName(String x) {
    name = x;
  }
}

in your new.jsp you would do this..

<jsp:useBean class="myPackage.MyBean " id="firstBean" scope="session" />
String UserName = request.getParameter("Name");
<jsp:setProperty name="firstBean" property="name" value="UserName" />


Then on anyother jsp page you would use this line..
<jsp:useBean class="myPackage.MyBean " id="firstBean" scope="session" />

and then to get the value you do this..
<jsp:getProperty name="firstBean" property="name" />

when using beans there are 3 things to keep in mind...

1)   you need a package.
      add this statement to all your .java files.
      package myPackage;

2)   you must call your bean like this.....
      <jsp:useBean class="myPackage.MyBean " id="firstBean" scope="session" />

3)   You must be using this directory structure

-jspfiles
-WEB-INF
   -classes
       -myPackage
            -MyBean.class
Cheers,
Ghost
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Author Comment

by:Ronayne
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>>and then to get the value you do this..
<jsp:getProperty name="firstBean" property="name" />

So the value will be stored in name?
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Expert Comment

by:copyPasteGhost
Comment Utility
well what's happening is your sending the variable to the java bean. the rules for javabeans are that if the method is
getName()...
the the variable must be name..
that's the way to do it.

you are then retriving the varible from the java bean.
is that clearer?
Ghost
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Author Comment

by:Ronayne
Comment Utility
>><jsp:useBean class="myPackage.MyBean " id="firstBean" scope="session" />
String UserName = request.getParameter("Name");
<jsp:setProperty name="firstBean" property="name" value="UserName" />

Could I not just do this on any jsp?
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Expert Comment

by:copyPasteGhost
Comment Utility
umm no. you must do that code on the page after the form because...

request.getParameter("Name");

gets the value from the form. So it has to be on the following page.

this part
<jsp:useBean class="myPackage.MyBean " id="firstBean" scope="session" />
<jsp:getProperty name="firstBean" property="name" />

can be done on any jsp, but remember that you have to set the variable before you can use it :)
cheers,
Ghost
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Author Comment

by:Ronayne
Comment Utility

ok, so the value will be stored in "name" and I can use this like i'd use any java variable?
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by:copyPasteGhost
Comment Utility
yeah I guess...

if you want to change it you will have to do...

<jsp:setProperty name="firstBean" property="name" value="newValue" />

if you want to get it you have to do..

<jsp:getProperty name="firstBean" property="name" />

is that what you mean?
Ghost
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Author Comment

by:Ronayne
Comment Utility

so I can just go : stmt = select * from table where names like "name";

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Accepted Solution

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copyPasteGhost earned 50 total points
Comment Utility
ok to do that you would have to do this...

first declare bean..
<jsp:useBean class="myPackage.MyBean " id="firstBean" scope="session" />
next you would do this...

stmt = select * from table where names like %><jsp:getProperty name="firstBean" property="name" /><%;

does that make more sense?
ghost
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Author Comment

by:Ronayne
Comment Utility

ah now I see, the fog has lifted... thanks a million
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Expert Comment

by:copyPasteGhost
Comment Utility
:)
no problem,
glad I can help,
Anything else?
Ghost
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Author Comment

by:Ronayne
Comment Utility

Thats grand as long as I can use this : %><jsp:getProperty name="firstBean" property="name" /><% as  a variable is all I need.
Thanks again
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Expert Comment

by:copyPasteGhost
Comment Utility
sure anytime.
if you need anything else I'll be here..
did you look at your xsl question, I posted a reply
Ghost
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Author Comment

by:Ronayne
Comment Utility

Ive seen your reply, im just kinda busy with other stuff, I havent had a chance to test it
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Expert Comment

by:copyPasteGhost
Comment Utility
cool no problem
laters
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Author Comment

by:Ronayne
Comment Utility

im just after trying out youor comments and I cant seem to get it working, How can I print out the value like so: out.print:%><jsp:getProperty name="firstBean" property="name" /><%

Thanks
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Author Comment

by:Ronayne
Comment Utility

its ok, i got it
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Expert Comment

by:copyPasteGhost
Comment Utility
sorry I didn't get back to you fast enough,
glad it works though
cheers,
Ghost
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Author Comment

by:Ronayne
Comment Utility

Hi ghost, im just having trouble with this one line, I just want to put idnum into the result but its not working

This is my code:
String inServer = "localhost";
  String inDBName = "test";
  String DATABASE_URL = "jdbc:mysql://" + inServer + ":3306/" + inDBName;
 
  Class.forName("com.mysql.jdbc.Driver").newInstance();
  Connection con = DriverManager.getConnection(DATABASE_URL, "username", "password");
  Statement stmt = con.createStatement();
   
 ResultSet rs1 = stmt.executeQuery("select idnum from userdesc where names like %><jsp:getProperty name="AccessV" property="name" /><%");

This is the error:

C:\Program Files\Apache Group\Tomcat 4.1\work\Standalone\localhost\seanproj\main_jsp.java:77: unclosed string literal
 ResultSet rs1 = stmt.executeQuery("select idnum from userdesc where names like
                                   ^

Thanks

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Author Comment

by:Ronayne
Comment Utility

That should be:

ResultSet rs1 = stmt.executeQuery("select idnum from userdesc where names like
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Author Comment

by:Ronayne
Comment Utility

its ok again... i just got it there.
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