52 lines
1.6 KiB
Java
52 lines
1.6 KiB
Java
|
Accessing servlet jndi environment variables
|
||
|
|
|
||
|
|
package com.ack.web.servlet;
|
||
|
|
|
||
|
|
import java.io.IOException;
|
||
|
|
import java.io.PrintWriter;
|
||
|
|
import javax.naming.Context;
|
||
|
|
import javax.naming.InitialContext;
|
||
|
|
import javax.naming.NamingException;
|
||
|
|
import javax.servlet.ServletException;
|
||
|
|
import javax.servlet.http.HttpServlet;
|
||
|
|
import javax.servlet.http.HttpServletRequest;
|
||
|
|
import javax.servlet.http.HttpServletResponse;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* It is better to use environment variables within a J2EE
|
||
|
|
* context for values that can be changed a deployment time
|
||
|
|
* instead of Context attributes within the web.xml. This
|
||
|
|
* way you don't have to update the web.xml to change the
|
||
|
|
* values.
|
||
|
|
*
|
||
|
|
*
|
||
|
|
<env-entry>
|
||
|
|
<description>the guy responsible for this site</description>
|
||
|
|
<env-entry-name>webmaster</env-entry-name>
|
||
|
|
<env-entry-value>x@xxx</env-entry-value>
|
||
|
|
<env-entry-type>java.lang.String</env-entry-type>
|
||
|
|
</env-entry>
|
||
|
|
*/
|
||
|
|
public class AccessingServletJndiEnvironmentVariables extends HttpServlet {
|
||
|
|
|
||
|
|
public void doGet( HttpServletRequest req, HttpServletResponse res )
|
||
|
|
throws ServletException, IOException {
|
||
|
|
res.setContentType( "text/html" );
|
||
|
|
PrintWriter pw = res.getWriter();
|
||
|
|
|
||
|
|
String webMaster = null;
|
||
|
|
try {
|
||
|
|
// get a handle on the JNDI root context
|
||
|
|
Context ctx = new InitialContext();
|
||
|
|
|
||
|
|
// and access the environment variable for this web component
|
||
|
|
webMaster = (String) ctx.lookup( "java:comp/env/webmaster" );
|
||
|
|
}
|
||
|
|
catch( NamingException ex ) {
|
||
|
|
ex.printStackTrace();
|
||
|
|
}
|
||
|
|
|
||
|
|
pw.println( "the web master is -> " + webMaster );
|
||
|
|
}
|
||
|
|
}
|