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a session problem

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posted 17 years ago

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hey,

i have 3 jsp pages, first.jsp contians radio buttons second.jsp contains a dropdown list, a text box, third.jsp is used to show display summary of all slected values in first and second jsps.

and last two jsps have back buttons to modify first two.

what all scopes i should use here to run this application properly.

when i used to request scope for second jsp values without mentioning any thing for first application was working fine. but i need to show all values of first jsp in third.

can any one help me please.

regards,

rahul

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posted 17 years ago

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It seems that you already know that you'll need to employ the session.

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Rauhl Roy

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can please tell me if i can post i question here on the same topice with some difference...

if yes, please read the below mentioned ..

my first.jsp

<HTML>
<BODY>
<FORM METHOD=POST ACTION="SaveName.jsp">

What's your name? <INPUT TYPE=TEXT NAME=username SIZE=20>
<P><INPUT TYPE=SUBMIT>

</FORM>
</BODY>
</HTML>

this is my second jsp called savename.jsp

<%
String name = request.getParameter( "username" );
session.setAttribute( "theName", name );
%>
<HTML>
<BODY>
<FORM METHOD="LINK" ACTION="first.jsp">
<INPUT TYPE="submit" VALUE="Clickable Button">
</FORM>
<A HREF="NextPage.jsp">Continue</A>

</BODY>
</HTML>

this is my thirs jsp

<HTML>
<BODY>
<FORM METHOD="LINK" ACTION="SaveName.jsp">
<INPUT TYPE="submit" VALUE="Clickable Button">
</FORM>
Hello, <%= session.getAttribute( "theName" ) %>
</BODY>
</HTML>

even though i put my values in session, when i go back to first jsp using back buttons , the value entered there is not show. please help me.

regards,

rahul

Mani Venkata Kanth

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posted 17 years ago

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See When your using back button all values which are added to session will be available in first jsp also.
But your not getting the values from session and putting in your fields.

What you need to do is:
In first jsp check in session whether any attribute was set with the name 'yourname'. if it is not null it means that you used back button from 3rd jsp.
so then get the value from session and put it in input value attribute.

Got it!!!
I guess my answer will help you. Let me know for any clarification on this.

Regards,
Krishna Prasad

Rauhl Roy

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posted 17 years ago

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what i was trying to tell you was, i want to put my data in like text box or drop down list or any kind of session scope. but when i come back ( from 3rd or 2nd jsp) should be able to edit it.

can you please send me code if you have any, i am also going to try and let you know if i manage the things. and can you please give me your maild id too.

See When your using back button all values which are added to session will be available in first jsp also.
But your not getting the values from session and putting in your fields.

What you need to do is:
In first jsp check in session whether any attribute was set with the name 'yourname'. if it is not null it means that you used back button from 3rd jsp.
so then get the value from session and put it in input value attribute.

Got it!!!
I guess my answer will help you. Let me know for any clarification on this.

Regards,
Krishna Prasad

[ June 06, 2007: Message edited by: Rauhl Roy ]
[ June 06, 2007: Message edited by: Rauhl Roy ]

Mani Venkata Kanth

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posted 17 years ago

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you can reach me at : soft.munna@gmail.com

Chandra Bhatt

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posted 17 years ago

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Hi Rauhl,

Solution to your porblem can be:

FirstJSP.jsp

<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">
 
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
   
    
    <h1>First Page</h1>
    <form action ="SecondJSP.jsp" method ="get">
    Choose your favorite color: <br>
    <%boolean r1=false,w1=false,g1=false,b1=false;
        String chosen =(String)session.getAttribute("color");
        if(chosen.equals("Red")) {
            r1=true;
        }else if(chosen.equals("White")) {
            w1=true;
        }else if(chosen.equals("Green")) {
            g1=true;
        }else if(chosen.equals("Blue")) {
            b1=true;
        }
               
    %>
    <%= createRadio("color1","Red",r1)%>
    <%= createRadio("color1","White",w1) %>
    <%= createRadio("color1","Green",g1) %>
    <%=  createRadio("color1","Blue",b1) %>
    
    <input type = "Submit" name ="Submit">
    </form>
    
    
    <%! public String createRadio(String name, String value, boolean checked) {       
       String str=null;
        str="<input type =\"radio\" name =" + name +
         " value=" + value;
        if(checked) {
            str =str+ " checked";
        }
        
        str =str+">";
        str=str+" " +value +"<br>" ;
        return str;
    }
        
    %>
    </body>
</html>

SecondJSP.jsp

ThirdJSP.jsp

Note: com.web.SaveRecord is a servlet that does the record saving
job. The code for that is not given here.

Thanks,
[ June 07, 2007: Message edited by: Chandra Bhatt ]

cmbhatt

Rauhl Roy

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posted 17 years ago

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thnk you very much mr bhatt for spending some time to give the answer to me and please give me your mail id to you to my frinends list and send me the programes used to save to the values.

regards,
rahul

Rauhl Roy

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posted 17 years ago

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Originally posted by Rauhl Roy:
thnk you very much mr bhatt for spending some time to give the answer to me and please give me your mail id to add you to my frinends list and send me the programe save record also please.
...

regards,
rahul

Chandra Bhatt

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posted 17 years ago

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Hi Rahul,

I have sent you the mail already; I got you mail-id you have provided to
JavaRanch.

I can be reached at [->chandra.m.bhatt@gmail.com<-]

Thanks,
[ June 08, 2007: Message edited by: Chandra Bhatt ]

cmbhatt

Chandra Bhatt

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posted 17 years ago

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Hi Rahul,

I gave given you the code to just look how things could be done. A better
way to do that would be using Bean, and session listeners so that Bean could
be synchronized to the database row.

I have not yet coded that portion that saves the record to the dbase. Better
if you could tell me whether this sort of code is for production use.

Anyway, on behalf of this code I can try to code the save record part too.

Thanks,

cmbhatt

Chandra Bhatt

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posted 17 years ago

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Separate class for database, record saving:

/*
 * SaveRecord.java
 *
 * Created on June 8, 2007, 3:17 PM
 *
 * 
 */
 
package com.others;
import java.sql.*;
import java.util.Properties;
import com.mybeans.User;
 
/**
 *
 * @author cmbhatt
 */
public class SaveRecord {
    
    /** Creates a new instance of SaveRecord */
    Connection conn=null;
    public SaveRecord() {         
        String driver = "sun.jdbc.odbc.JdbcOdbcDriver";
        String url  ="jdbc:odbc:user_record";
        String user = "scott";
        String password = "tiger";
        Properties prop = new Properties();
        try{
            Class.forName(driver);
            prop.setProperty("user",user);
            prop.setProperty("password",password);
            conn = DriverManager.getConnection(url,prop);            
        }catch(Exception e) {
            e.printStackTrace();
            System.exit(1);
        }
    }
    
    public void doSave(User user) {
        String name = user.getName();
        String fav_color = user.getFav_Color();
        try{
            Statement stmt = conn.createStatement();
            ResultSet rset = stmt.executeQuery("SELECT MAX(user_id) FROM user_record");
            rset.next();
            int uid=0;
            
                           
            uid=Integer.valueOf(rset.getInt(1)).intValue()+1;
            stmt =conn.createStatement();           
            stmt.execute("INSERT INTO user_record values (" + uid + 
                    ", '" + name + "', '" + fav_color +"')");
            
        }catch(SQLException sqle) {
            sqle.printStackTrace();
        }
    }    
}

ThirdJSP.jsp

SaveRecordJSP.jsp

User Bean:
User.java

Thanks,
[ June 08, 2007: Message edited by: Chandra Bhatt ]

cmbhatt

Rauhl Roy

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posted 17 years ago

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this is really great. thank you very much mr.bhutt... thnks you..

i will check my mail and will be in touch with you.

regards,
rahul

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