Question

I written a program to retrieve data from database in servlets.now I want pass this value to jsp as a hyperlink. How to do this?

This is my servlet code what I wrote:

  import java.io.*;
  import java.sql.*;
  import javax.servlet.*;
  import javax.servlet.http.*;

  public class ViewServlet extends HttpServlet{
  public void doGet(HttpServletRequest req, HttpServletResponse res)
    throws ServletException, IOException
  {
  res.setContentType("text/html");
  PrintWriter pw = res.getWriter();
  Connection con;
  Statement stmt;
  ResultSet rs;
  String acid = null;
  try{
  Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
  con = DriverManager.getConnection("jdbc:odbc:DSN","scott","krishna");
  stmt = con.createStatement();
  rs = stmt.executeQuery("Select id from custm where name='jai'");
  req.setAttribute(acid,rs);
  req.getRequestDispatcher("my_jsp_page.jsp").forward(req, res); 
   }
  catch (Exception e){
  pw.println(e);
  }
  }

}

Now I edited the code now its saying cannot call setAttribute with null value.

Answer 1

For extracting value from resultset:

while (rs.next()) {
String acid = rs.getString("id");
}

You can store values in Request scope using setAttribute() method….
In jsp you can retrieve it using expression language…

In servlet

request.setAttribute("acId",acid);

In jsp:

${acId}

There is also other way…
You can also use scriplets for displaying purpose in jsp..
for example….

<%  
      String str = (String)request.getAttribute("acId");
%>
Value is :: <%= str %>

for calling jsp from servlet use :

request.getRequestDispatcher("your.jsp").forward(request,response);