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access same variable in multiple jsp pages

Ronayne
Ronayne asked
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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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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

Author

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

So the value will be stored in name?
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

Author

Commented:
>><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?
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

Author

Commented:

ok, so the value will be stored in "name" and I can use this like i'd use any java variable?
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

Author

Commented:

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

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Author

Commented:

ah now I see, the fog has lifted... thanks a million
:)
no problem,
glad I can help,
Anything else?
Ghost

Author

Commented:

Thats grand as long as I can use this : %><jsp:getProperty name="firstBean" property="name" /><% as  a variable is all I need.
Thanks again
sure anytime.
if you need anything else I'll be here..
did you look at your xsl question, I posted a reply
Ghost

Author

Commented:

Ive seen your reply, im just kinda busy with other stuff, I havent had a chance to test it
cool no problem
laters

Author

Commented:

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

Author

Commented:

its ok, i got it
sorry I didn't get back to you fast enough,
glad it works though
cheers,
Ghost

Author

Commented:

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

Author

Commented:

That should be:

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

Author

Commented:

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