servlet problem
Hi,
Can anyone tell me why these two pieces of code do not talk to each other?
<form method="GET" action="servlet/EventServlet">
<input name="key" type="text" size="25"/>
<input type="submit" name="event:Search" value="Go" /></form>
and ...
import java.io.*;
import java.util.Enumeration;
import javax.servlet.*;
import javax.servlet.http.*;
publicclass EventServletextends HttpServlet
{
publicvoid doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
// determine event
String event ="Unknown";// new String();
Enumeration parameters = request.getParameterNames();
while(parameters.hasMoreElements())
{
String name = (String) parameters.nextElement();
if(name.indexOf("event") != -1)
{
event = name.substring("event:".length());
}
}
// delegate event-response
if (event.equals("Search"))
{
ServletContext context = getServletContext();
RequestDispatcher rd = context.getRequestDispatcher("/EventSearch.jsp");
rd.forward(request, response);
}
//...other events
}
publicvoid doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
doGet(request, response);
}
}
Server throws this:
type Exception report
message
description The server encountered an internal error () that prevented it from fulfillingthis request.
exception
java.lang.IllegalStateException: Cannot forward after response has been committed
EventHandlerServlet.doGet(EventHandlerServlet.java:129)
javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.
Message was edited by:
avdo77
[3378 byte] By [
avdo77a] at [2007-11-27 5:45:16]
[nobr]I've done that in jsp file which is in between:
<%@page import="java.util.Calendar"%>
<%@page import="java.io.*"%>
<%@page import="java.sql.*"%>
<%@include file="connection.jsp" %>
<%@ page import="java.io.*,java.util.Enumeration" errorPage="/Error.jsp" %>
<%
// get input parameter userName - INPUT ACTION
String searchKey = request.getParameter("single");
if(searchKey.equals(""))
{
out.println("Parameter for search not found! Please enter it!");
return;
}
session.invalidate();
session = request.getSession(true);
int cl_id1 = (int)(Math.random() * 1000000);
int cl_id2 = (int)(Math.random() * 1000000);
int cl_id3 = cl_id1 + cl_id2;
String cl_id4 = "" + cl_id3;
session.setAttribute("client_id", cl_id4);
int o_id1 = (int)(Math.random() * 1000000);
int o_id2 = (int)(Math.random() * 1000000);
int o_id3 = o_id1 + o_id2;
String o_id4 = "" + o_id3;
session.setAttribute("order_id", o_id4);
//Then generate search results page
%>
<% ResultSet rs = null;%>
<img src="arrow.jpg" alt="arrow" width="13" height="13" /><span class="style5"><strong>
Search Results</strong></span>
<table border=1>
<tr><td><b>Title</b></td>
<td><b>Price (AU$)</b></td>
<td><b>Category</b></td>
<td><b>ProdYear</b></td>
<td><b>Classification</b></td>
<td><b>Actors</b></td>
<td><b>Quantity</b></td>
<td><b>Add</b></td></tr>
<%
Connection connection = connectDB();
Statement statement = connection.createStatement();
String queryStatement = "select * from dvd where Kind = 'Movie' and Title like '%" + searchKey + "%'";
rs = statement.executeQuery(queryStatement);
%>
<form action="EventHandlerServlet">
<%while(rs.next())
{
%>
<tr><td><% out.println(rs.getString("Title")); %></td>
<td><% out.println(rs.getString("Price")); %></td>
<td><% out.println(rs.getString("Category")); %></td>
<td><% out.println(rs.getString("ProdYear")); %></td>
<td><% out.println(rs.getString("Classification")); %></td>
<td><% out.println(rs.getString("Actors")); %></td>
<td><input name="quantity" type="text" size="1" /></td>
<input type="hidden" name="ID" value="<% out.println(rs.getString("DVD_ID"));%>">
<td><input type="submit" name="event:AddToCart" value="Add"></td></tr>
<%
} //end while%></form>
</table><br>
<input type="submit" name="event:ViewCart" value="View Shopping Cart!">
<input type="submit" name "event:CheckOut" value="Go to Check Out!">
<input type="submit" name="event:Quit" value="Quit!"> </form> <hr>
Don't pay attention to variables they might be slightly different because this is newer code[/nobr]
