not able to get the correct value from the seesion
pls check my code...
i am getting error with variables curprice and also with total...
i want to put the costs of all the products in the session objects and finally
calculate the totalcost and dispaly it..
pls help me
satish
import java.io.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class cart extends HttpServlet
{
Connection con = null;
PreparedStatement pst = null;
ResultSet rs =
null;
public void init(ServletConfig sc) throws ServletException
{
try
{
Class.forName("COM.ibm.db2.jdbc.app.DB2Driver");
con = DriverManager.getConnection("jdbc:db2:sample",
"satish", "london");
super.init(sc);
}
catch(Exception e) {e.getMessage() ; }
}
public void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
{
res.setContentType("text/html");
PrintWriter out = res.getWriter();
HttpSession session = req.getSession(true);
Object[] items = (Object []) session.getValue("cart.items");
out.println("<html> ");
out.println("<body bgcolor=899699>");
out.println("<H3>you currently have the following
items in your cart:</H3><br>");
out.println("<form> ");
out.println("<table>");
if(items!=null)
{
for (int i = 0 ; i < items.length
; i++ )
{
try
{
String str1 =
(String) items[ i ] ;
pst = con.prepareStatement("select
* from ITEMTAB where itmname = ? " );
pst.setString(1,str1)
;
rs = pst.executeQuery(
);
while(rs.next())
{
out.println("<tr>
");
out.println("<td> ");
out.println( "The Price of " + " " + str1 + " is "
+ " " + rs.getString("price"));
out.println("</td> ");
out.println("</tr>
");
out.println("</table>
");
out.println("<br>");
String
curprice = rs.getString("price") ;
session.putValue("total.cost",
curprice+curprice );
}
String totprice = (Object)
session.getValue("total.cost");
Object total = (Object) curprice
+ totprice ;
session.putValue("total.cost",
total );
}
catch(Exception e) { e.getMessage()
; }
}
out.println("<table border
= 1 cellpadding = 2 cellspacing = 3>");
out.println("<tr>
");
out.println("<td>
");
out.println("The Total Cost of all the Products in the Cart is : " +
total );
out.println("</td>
");
out.println("</tr>
");
out.println("</table>
");
out.println("</form>
");
}
else
{
out.println("There are no items in the session
value for cart.items" );
}
out.println("</body>");
out.println("</html> ");
}
}
Re: not able to get the correct value from the seesion
Can you try this....
import java.io.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class cart extends HttpServlet
{
Connection con = null;
PreparedStatement pst = null;
ResultSet rs = null;
public void init(ServletConfig sc) throws ServletException
{
try
{
Class.forName("COM.ibm.db2.jdbc.app.DB2Driver");
con = DriverManager.getConnection("jdbc:db2:sample","satish",
"london");
super.init(sc);
}
catch(Exception e) {e.getMessage() ; }
}
public void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
{
String strtotalprice = new String();
res.setContentType("text/html");
PrintWriter out = res.getWriter();
HttpSession session = req.getSession(true);
Object[] items = (Object []) session.getValue("cart.items");
out.println("<html> ");
out.println("<body bgcolor=899699>");
out.println("<H3>you currently have the following items in your cart:</H3><br>");
out.println("<form> ");
out.println("<table>");
if(items!=null)
{
String strcurprice = new String();
for (int i = 0 ; i < items.length; i++ )
{
try
{
String str1 = (String) items[ i ] ;
pst = con.prepareStatement("select price from ITEMTAB where
itmname = ? " );
pst.setString(1,str1);
rs = pst.executeQuery();
while(rs.next())
{
strcurprice = rs.getString("price");
out.println("<tr>");
out.println("<td> ");
out.println( "The Price of " + " " + str1 + " is
" + " " + strcurprice );
out.println("</td> ");
out.println("</tr>");
out.println("</table>");
out.println("<br>");
String strsessiontotalval = (String)session.getValue("total.cost");
if (strsessiontotalval == null)
strsessiontotalval = "0.0";
session.putValue("total.cost", (new Float(Float.parseFloat(strsessiontotalval)
+ Float.parseFloat(strcurprice)).toString()) );
} // end while
} // end try block
catch(Exception e) { e.getMessage(); }
} // end for loop
out.println("<table border = 1 cellpadding = 2 cellspacing = 3>");
out.println("<tr>");
out.println("<td>");
String totval = (String)session.getValue("total.cost");
out.println("The Total Cost of all the Products in the Cart is : " +
totval );
out.println("</td>");
out.println("</tr>");
out.println("</table>");
out.println("</form>");
}
else
{
out.println("There are no items in the session value for cart.items"
);
}
out.println("</body>");
out.println("</html> ");
}
}
Re: not able to get the correct value from the seesion
Dear Nikhil,
thanks for ur response.
i treid with ur code the pgm got compiled but then when i tried run that
it gave the following error..pls check it.
satish
-----------------------------------------------------------------
500 Internal Server Error
The servlet named invoker at the requested URL
http://localhost:8080/servlet/cart
reported this exception: java.lang.Float: method parseFloat(Ljava/lang/String;)F
not found. Please report this to the administrator of the web server.
java.lang.NoSuchMethodError: java.lang.Float: method parseFloat(Ljava/lang/String;)F
not found at cart.doPost(Compiled Code) at javax.servlet.http.HttpServlet.service(HttpServlet.java:747)
at javax.servlet.http.HttpServlet.service(Compiled Code) at com.sun.server.ServletState.callService(ServletState.java:226)
at com.sun.server.ServletManager.callServletService(Compiled Code) at com.sun.server.http.servlet.InvokerServlet.service(InvokerServlet.java:137)
at javax.servlet.http.HttpServlet.service(Compiled Code) at com.sun.server.ServletState.callService(ServletState.java:226)
at com.sun.server.ServletManager.callServletService(Compiled Code) at com.sun.server.ProcessingState.invokeTargetServlet(ProcessingState.java:423)
at com.sun.server.http.HttpProcessingState.execute(HttpProcessingState.java:79)
at com.sun.server.http.stages.Runner.process(Runner.java:79) at com.sun.server.ProcessingSupport.process(Compiled
Code) at com.sun.server.Service.process(Service.java:204) at com.sun.server.http.HttpServiceHandler.handleRequest(HttpServiceHandler.java:374)
at com.sun.server.http.HttpServiceHandler.handleRequest(Compiled Code) at
com.sun.server.HandlerThread.run(Compiled Code)
