<td width="44%">Existing Customers:
<table valign=top>
<form method=post action="login.jsp">
<tr><td width="30%">Username:</td><td width="70%"><input type=text name="username"></td></tr>
<tr><td width="30%">Password:</td><td width="70%"><input type=password name="password"></td></tr></table>
<input type="image" src="login.jpg" name="action" value="login">
[java] JSP's and POST
Author
EDIT: I mean parameters, not attributes.
I'm having a problem with my JSP's.
For some reason, whenever I have a form that posts data, the post request is received, but there are absolutely no parameters with it.
Do you maybe want to use request.getParameter(name) instead of request.getAttribute(name) ? I know that''s what you would want to use to pull the username/password fields, but I''m not sure what you''re looking for out of the action parameter.
I use attributes of the session object all the time, but I still haven''t found a common use for request attributes (at least for form processing)...
I use attributes of the session object all the time, but I still haven''t found a common use for request attributes (at least for form processing)...
If I put this at the top of what you provided and post to the same page...
I get a list showing username, password, action.x, and action.y - could you post a snippet of what you''re using that returns the nulls?
What if you include the parameters in the query string, like http://localhost:8080/login.jsp?action=go - does anything show up then?
<%@ page import="java.util.Enumeration" %><b><ul>Parameters<% Enumeration enum = request.getParameterNames(); String parm; while (enum.hasMoreElements()) { parm = (String)enum.nextElement(); out.print("<li>" + parm + "</li>"); }%></ul></b> I get a list showing username, password, action.x, and action.y - could you post a snippet of what you''re using that returns the nulls?
What if you include the parameters in the query string, like http://localhost:8080/login.jsp?action=go - does anything show up then?
Here''s a simple JSP I wrote which just creates a table displaying all the parameters passed to the page.
<%@ page import="java.util.*" %><!doctype html public "-//w3c//dtd html 4.0 transitional//en" "http://www.w3.org/TR/REC-html40/strict.dtd"><head> <title>Parameter echo demo</title></head><body><table border="1"><tr><td width="200" align="center">Name</td><td width="200" align="center">Value</td></tr><%Map m = request.getParameterMap();for (Iterator i = m.entrySet().iterator(); i.hasNext(); ){ Map.Entry e = (Map.Entry)i.next(); String name = (String)e.getKey(); String [] vals = (String [])e.getValue(); %> <tr> <td><%= name %></td> <td> <% for (int j = 0; j < vals.length; j++) { %><%= vals[j] %><br><% } %> </td> </tr> <%}%></table></body></html> This topic is closed to new replies.
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