Define mysql and host connection only 1 place

Question

Hi everyone,
For my school project i developed a application using servlets and jsp.
In every servlet i make a new connection.
Like this:
public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        System.out.println("MySQL Connect Example.");
        Connection conn = null;
        String url = "jdbc:mysql://127.0.0.1:3306/";
        String dbName = "cijfersysteem";
        String userName = "vishant";
        String password = "vishant";
        String driver = "com.mysql.jdbc.Driver";But if my host changes for example i need to change it in 10 or more files.
that is not efficient.
How can i make the connection in 1 file and require it over every other servlet?
Thnx in advance for the help everyone.

Answer 1

If you are using Tomcat or Jetty, you can define JNDI entries like this:
[http://tomcat.apache.org/tomcat-6.0-doc/jndi-resources-howto.html#JDBC%20Data%20Sources]
[http://docs.codehaus.org/display/JETTY/JNDI]
You should be using resource injection in Glassfish.