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Need help on Passing parameters

 
Sam Saha
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posted 13 years ago
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I have a form where I am entering the message in the message box and the username is generating as read only. By post method I am calling a servlet. Now I wanted to pass the values of the what I have typed in the message box as well as the user name from the JSP to the servlet. Please help me how I can pass them to servlet.


The form in the JSP:



<HEAD>
<TITLE>Thank you for your feedback!</TITLE>


<div id="nav">

<%
String feedbackStr = "";
feedbackStr = "../ame/feedback";

%>

<form name="jsform" action="<%= feedbackStr%>" method="post">

<table><tr>
<td align="right">Name:</td>
<td><p id="username"></p></td>
</tr>
<tr>
<td align="right"><input type="checkbox" name="feedback" value="fb" /></td>
<td>Send a copy to the user</td>
</tr>
<tr>
<td colspan="2">
Your message:<br>
<textarea name="message" cols="31" rows="6" wrap="soft">
</textarea>
</td>
</tr>
<tr>
<td colspan="2">
<center>
<input type="submit" value="Send Message">
</center>
</td>
</tr></table>
</form>


</div>
</HEAD>




The Servlet code:

public class feedback extends HttpServlet {

private UserFeedbackWSCall feedbackWebServiceCall = new UserFeedbackWSCall();

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {

try{
response.setContentType("text/html");
java.io.PrintWriter out = response.getWriter();
out.println("<html><head>");
out.println("<title>Feedback Submission Connfirmation</title></head><body>");
out.println("<h2>Thank you for your Feedback!</h2>");
out.println("</body></html>");

}catch (Exception e){
throw new ServletException(e.getMessage());
}

} //doGet

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
doGet(request, response);
}

}

 
Bear Bibeault
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posted 13 years ago
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In the servlet, use request.getParameter() to fetch the submitted values of the form controls.

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Bear Bibeault
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posted 13 years ago
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And, generating HTML in a servlet: bad practice. Java code in a JSP: bad practice.

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Sam Saha
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posted 13 years ago
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I am using the code out.println("Message"+request.getAttribute("message")); in the sevlet but I am getting the null value. Please help me. Theanks.
 
Bear Bibeault
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posted 13 years ago
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Please show me, in my reply, where I recommended using request.getAttribute().

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Sam Saha
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public class feedback extends HttpServlet {

private UserFeedbackWSCall feedbackWebServiceCall = new UserFeedbackWSCall();

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {

String applicationCD = "";
String requestedByLanId = "";
UserFeedback feedback = new UserFeedback();

System.out.print("I have successfully Entered into the feedback sevlet"+request.getAttribute("message"));

try{
response.setContentType("text/html");
java.io.PrintWriter out = response.getWriter();

out.println("<html><head>");
out.println("<title>Feedback Submission Connfirmation</title></head><body>");
out.println("<h2>Thank you for your Feedback!</h2>");
out.println("Message"+request.getAttribute("message"));
out.println("</body></html>");

}catch (Exception e){

throw new ServletException(e.getMessage());

}

} //doGet

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
doGet(request, response);
}


}

 
Stefan Evans
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posted 13 years ago
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I would recommend that you look up the difference between request.getParameter and request.getAttribute.

They are very different beasts.
 
Sam Saha
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I am extremely sorry. I am very new in web development. I correct my code and used request.getParameter("message") instead of request.getAttribute("message"). I am geeting the value in the servlet. Thank you very much.
 
Bear Bibeault
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posted 13 years ago
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Programming is all about attention to detail. In my early reply I told you to use getParameter(), not getAttribute(). Paying attention to details like this is mandatory if you are to make progress.

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Sam Saha
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Sure. Thank you for your good suggestion and I will obey you. Thank you one more time.
 
Sam Saha
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I am trying pass the user name value to the servlet from the JSP using out.println("User Name: " + request.getParameter("fdbackurname")); in the servlet. But the user name is showing null. Please help me.

Here is JSP code:

<td align="right">Name:</td>
<td><p id="username" name="fdbackurname"></p></td>
</tr>


User name is displaying in the JSP by the following sript:

<script type='text/javascript' src="scripts/jquery.autocomplete.js"></script>
<script language="JavaScript"><!--

var XMLHttpRequestObjectRVT = false;
var XMLHttpRequestObjectUDN = false;
if (window.XMLHttpRequest) {
XMLHttpRequestObjectRVT = new XMLHttpRequest();
XMLHttpRequestObjectUDN = new XMLHttpRequest();
} else if (window.ActiveXObject) {
XMLHttpRequestObjectRVT = new ActiveXObject("Microsoft.XMLHTTP");
XMLHttpRequestObjectUDN = new ActiveXObject("Microsoft.XMLHTTP");
}
var mccn_viewer = "<%=((String)request.getSession().getAttribute("MCCN_VIEWER"))%>";

function callUserDisplayName(){
var dataSource="userDisplayName";
var obj2 = document.getElementById("username");

var obj3 = document.getElementById("usernameFB");

var str = "";

if(XMLHttpRequestObjectUDN) {
XMLHttpRequestObjectUDN.open("Post", dataSource);
XMLHttpRequestObjectUDN.onreadystatechange = function() {
if (XMLHttpRequestObjectUDN.readyState == 4 &&
XMLHttpRequestObjectUDN.status == 200) {
var responseXML2 = XMLHttpRequestObjectUDN.responseXML;
if (responseXML2 != null ){
var root = responseXML2.documentElement;
var displayName = root.getElementsByTagName("DisplayName")[0].text;
if(displayName != null && displayName != "" && displayName !="Guest"){
obj2.innerHTML = "<Strong>"+displayName+"</Strong>";
if(obj3 != ""){
obj3.innerHTML = "<h5>Name: <strong>"+displayName+"</strong></h5>";
}
}else {
obj2.innerHTML = "<Strong>"+"Guest"+"</Strong>";
if(obj3 != ""){
obj3.innerHTML = "<h5>Name: <strong>"+"Guest"+"</strong></h5><h6>For a direct response, please provide your name in the feedback area below.</h6>";
}
}

}else {
obj2.innerHTML = "Welcome " +"<Strong>"+"Guest"+"</Strong>";
if(obj3 != ""){
obj3.innerHTML = "<h5>Name: <strong>"+"Guest"+"</strong></h5><h6>For a direct response, please provide your name in the feedback area below.</h6>";
}
}
}

}
XMLHttpRequestObjectUDN.send(null);
}

}

WindowOnload(callUserDisplayName);

function WindowOnload(f) {
var prev=window.onload;
window.onload=function(){ if(prev)prev(); f(); }
}


--></script>

 
Bear Bibeault
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Hmmm, I'm trying to look at your code, but the stubborn forum software has made it look all wonky. If you use CODE tags when posting code to the forums (see the FAQ at ⇒ UseCodeTags ⇐) they tell it "Hey! Keep your hands off my formatting!" and your code will look just like when you cut and pasted it into the reply. Cool, no?

The best way to debug this is to use a tool like Firebug in Firefox (or the builtin tools for IE8, Safari or Chrome) to actually look at what is being passed in the HTTP request. That will tell you whether the issued is the client code not sending the info correctly, or the server code not fetching it correctly (or perhaps a little of both).

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Bear Bibeault
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And.... if it turns out that your Ajax code is the issue, do yourself a favor and adopt one of the modern JavaScript libraries (such as jQuery or Dojo) to do your Ajax for you. No self-respecting seasoned developer writes their own Ajax code anymore.

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Sam Saha
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I think the AJAX script is working fine. Because I am getting the User name in the JSP page. But when I am trying to get the user name in the servlet I am getting the user name is null in the servlet.
 
Bear Bibeault
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Once again -- attention to detail. Don't assume that it is working, prove it!

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Sam Saha
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Here is the result in the JSP in the attachment.

form.PNG
[Thumbnail for form.PNG]
The user name display in the JSP
 
Bear Bibeault
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I am not interested in downloading images or seeing what the end result is.

The question remains: are the parameters as you expect them to be, passed correctly in the HTTP request? Looking at the HTTP request itself, not the end result of a JSP, is the fastest and best way to diagnose such issues.

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