Question

Get Client IP info from a Servlet into a Class

Asked by: jandersonwidener

I can successfully get the Host IPAddress of the requesting client to return to the screen fine in (File 1 my.jsp) and on all .jps page(s) via my serializable servlet session thanks to File 2 ViewDefinition Class.

But when I try to Add the IP information to send that info to an email notification not just return it to the JSP Screen I get null or it blows up the page no matter how I try it using File 3 MailNotification Class, File 4 Email Notifications I stream in vis File 5 webconfig which assigns the email address as a global variable and my File 6 which Processes the Email to be sent.

I know what I need to do -- also carry the getSessionIPAddress into other classes
but cannot seem to figure out how can I extend the instance life of the servlet variable  this.sessionIPAddress and assign it to a variable to email ?

Please help.

Thanks sooo much !

Should I add the String to my Default constructor or something else ?
When I try to make getSessionIPAddress static to carry the IP, the IP is returned but then the rest of my surrounding code blows out...

------------------------------------------ File 1 ----------------------------------------------------
<!-- /WEB-INF/jsp/my.jsp -->
<jsp:useBean id="viewDefinition" scope="request" class="mytld.mycompany.projectpackage.MVC_view.ViewDefinition" />
<jsp:getProperty name="viewDefinition" property="sessionIPAddress"/>
<!-- this works fine -->
 
------------------------------------------ File 2 ----------------------------------------------------
/** ViewDefiition **/
package mytld.mycompany.projectpackage.MVC_view;
 
public class ViewDefinition implements java.io.Serializable {
  public String sessionIPAddress;
 
 /**   * Default Constructor   **/
  public ViewDefinition() {
  }
 
// and accessor method ::.
  public String getSessionIPAddress() {
	  return sessionIPAddress;
  }
 
// and mutator method ::.
  public void setSessionIPAddress(String sessionIPAddress) {
	  this.sessionIPAddress = sessionIPAddress;
  }
} // end class
 
------------------------------------------ File 3 ----------------------------------------------------
/** Mail notification **/
package mytld.mycompany.projectpackage.MVC_model;
 
 
public class MailNotification implements Serializable  {
private static final String IP_PATTERN =  "${userhostip}";
 
 /**   * Default Constructor   **/
public MailNotification() {
}
 
public String getMessage() {
 
// I know this is WRONG -- it works but blow out other code... Any ideas ?
ViewDefinition ipview = new ViewDefinition();		
String reapIP = ipview.getSessionIPAddress();
 
String text = message;
text = replace(text, IP_PATTERN, reapIP);
return text;
}
 
} // end class
------------------------------------------ File 4  ----------------------------------------------------
<!-- /WEB-INF/notifications.xml -->
 
<notification notificationType="EMAIL_IP">
<subject>IP Alert</subject>
<message><![CDATA[
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252" />
<title>IP Notice</title>
</head><body>
    <p style="${style}">User's IP: <strong>${userhostip}</strong></p>
</body></html>
]]></message>
<mime_type>text/html</mime_type>
</notification>
------------------------------------------ File 5  ----------------------------------------------------
 
<!--  /WEB-INF/webconfig.xml -->
 
<servlet>
<servlet-name>controlservlet</servlet-name>
<servlet-class>mytld.mycompany.projectpackage.controller.ControlServlet</servlet-class>
<init-param>
<description>Email Destination</description>
<param-name>infosecEmail</param-name>
<param-value>myTargetEmail@myDomainName.tld</param-value>
</init-param>
</servlet>
 
------------------------------------------ File 6  ----------------------------------------------------
/** Processor Class **/
package mytld.mycompany.projectpackage.controller;
 
import java.io.IOException;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
 
import mytld.mycompany.projectpackage.MVC_model.*;
import mytld.mycompany.projectpackage.MVC_view.*;
 
try {
MailNotification notification = MailNotification.loadNotification(ctx.getResourceAsStream("/WEB-INF/notifications.xml"), NotificationType.EMAIL_IP);
Util.sendMail(Util.INFOSEC_EMAIL, Util.DEFAULT_FROM, notification.getSubject(), notification.getMessage(resetAccount), notification.getMimeType());
catch (Exception mex) {
mex.printStackTrace();
logger.log(Logger.ERROR, "IP Error +mex.getMessage(), request.getRemoteAddr()); // it works here ? Why cant I pass the HostInetAddress to the Email Message Object ? AUURRGGGHH ! ;)
}							
return viewDefinition;
}
break;

                                  
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Asked On
2009-10-13 at 12:10:58ID24808890
Tags

java

,

InetAddress

,

Host IP

,

Client Request

,

Server Response

,

Servlet

,

Class

,

beginner java

Topics

Java Server Pages (JSP)

,

TCP/IP

,

Java Servlets

Participating Experts
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Points
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Comments
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Answers

 

by: mwvisa1Posted on 2009-10-13 at 17:22:52ID: 25566151

jandersonwidener,

Since you are storing the bean in the "request" scope :

<jsp:useBean
   id="viewDefinition" <strong>scope="request"</strong>
   class="mytld.mycompany.projectpackage.MVC_view.ViewDefinition" />

It will have to be accessed as such in the servlet :

<strong>
ViewDefinition ipview = (ViewDefinition)request.getAttribute("viewDefinition");
</strong>

To ensure that the request object was carried from the JSP page to the Servlet page I used :

<jsp:forward page="./ControlServlet" />

Where /ControlServlet is the url-pattern mapped to my version of mytld.mycompany.projectpackage.controller.ControlServlet.

Also (just in case since you only show getProperty above), I set the property of my bean as such :

<jsp:<strong>setProperty</strong>
   name="viewDefinition" property="sessionIPAddress"
   <strong>value="<%= request.getRemoteAddr() %>"</strong> />

I am not sure of your implementation of MailNotification.loadNotification, but in mine I took in the InputStream with the XML you supplied and converted that to a string I stored in an instance variable called "message" on a new MailNotificaiton instance and then returned the instance.

Now in my servlet I have an instance of MailNotification.  This is probably not what you want to do totally, but hopefully it gives you the idea of what I am suggesting here -- which is to read the ViewDefinition from HttpRequest in Servlet and then pass it to the MailNotification object somehow -- I chose to do it through getMessage().

public String getMessage(<strong>ViewDefinition ipview</strong>) {

       String reapIP = ipview.getSessionIPAddress();

       String text = message; // <-- message was loaded via xml.
       // note fix to replace call.
       <strong>
       text = text.replace(IP_PATTERN, reapIP);
       </strong>
       
       return text;
   }


So putting this together in the servlet, I did :
ViewDefinition ipview = (ViewDefinition)request.getAttribute("viewDefinition");
<strong>notification.getMessage(ipview))</strong>

If anything is unclear OR you still can't get this to work in your environment, please share the code for JSP that you are using to set the IP address in the first place and how you are passing to the servlet.

Also show the rest of the servlet code where you are reading the bean again.  You had this in the MailNotification class which will probably not work that way.  You can try it from a different scope like application OR session, but request would require the HttpRequest object in order to read the bean from so another alternative would be to pass that to the getMessage() function instead of ViewDefinition.

Hope that helps.

--isa

 

by: jandersonwidenerPosted on 2009-10-19 at 06:36:41ID: 25604995

I figured it out last week and was trying to get it together to post.
In file No.3 MailNotificaation I simply re-access the current this.session a different way and NOT make a new viewDefinition object like I was thinking I needed to.

MailNotification notification = MailNotification.loadNotification(ctx.getResourceAsStream("/WEB-INF/notifications.xml"), NotificationType.FIRST_FAILURE_NOTICE);
Util.sendMail(Util.SUPPORT_EMAIL, Util.DEFAULT_FROM, notification.getSubject(), MailNotification.replace(notification.getMessage(resetAccount), "${userhostip}", request.getRemoteAddr()), notification.getMimeType());
                                              
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by: mwvisa1Posted on 2009-10-19 at 08:51:02ID: 25606336

Glad you found that.
It was my point above that the code :

ViewDefinition ipview = new ViewDefinition();          
String reapIP = ipview.getSessionIPAddress();

Was not valid which is why I suggested passing it the viewDefinition stored in session or request scope :

ViewDefinition ipview = (ViewDefinition)request.getAttribute("viewDefinition");

Anyway, glad you found a way to do that in MailNotification itself.

Regards and happy coding!

Kevin

20120131-EE-VQP-002

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