Example 7.1 Implementing a Filter - Debugging Filter

public class DebuggingFilter implements Processor {
  private Processor target;

  public DebuggingFilter(Processor myTarget) {
    target = myTarget;
  }

  public void execute(ServletRequest req, 
  ServletResponse res) throws IOException, 
    ServletException 	{
    //Do some filter processing here, such as 
    // displaying request parameters
    target.execute(req, res);
  }
}