context

The Strategy Design Pattern in Java

Summary: A discussion of the Strategy Design Pattern using Java source code examples.

The Strategy Design Pattern consists of a number of related algorithms encapsulated in a driver class often named Context. A user or a client program typically selects the algorithm they want to use, although the Context class may also select the algorithm automatically.

The intent of the Strategy Pattern is to make the algorithms easily interchangeable, and provide a means to choose the appropriate algorithm at a particular time.

By Alvin Alexander on October 17, 2012

JSP URI/URL - How to get the request URI, URL, and Context from a JSP

JSP URI/URL FAQ: How do I get a URI or URL from a JSP (the request URI or request URL)?

I was just working with a JSP, and trying to remember how to get information that can be very helpful inside of a JSP, specifically how to determine the Context, URI, and URL from within a JSP.

To that end, here's the Java source code for a JSP I wrote that will display the Context, URI, and URL for this JSP when it is accessed from a browser:

By Alvin Alexander on August 5, 2011

How to load a Spring application context file from a standalone Java application

Here's the source code for a standalone Java application where I load a Spring application context file with the ClassPathXmlApplicationContext method. In other blogs I've shown how to load the application context for web applications, but I also wanted to show how to do this for a standalone program.

Here's a source code for my Java program that loads a Spring application context file from the typical main method:

By Alvin Alexander on October 17, 2012

How to load multiple Spring application context files for a web application

Here's an example web.xml configuration file where I show how to configure the Spring Framework to properly load for a Java web application. I'm intentionally trying to keep this Spring example simple, so my web.xml file has almost the bare minimum configuration.

I show how to load the Spring ContextLoaderListener class with the listener-class tag, and also show how to load multiple Spring application context files using the context-param, param-name, and param-value XML tags.

By Alvin Alexander on October 17, 2012

Frustrations with the Mac "Open With..." menu

Ever since I got my Mac I've been wondering how the "Open With..." menu item works. This is the menu item you see when you right-click a file icon.

My particular situation is that I like to use several different applications to edit HTML files, but none of them are named DivX, BuildApplet, QuickTime, Help Viewer, etc. So I want to get all of those choices out of my popup menu.

By Alvin Alexander on October 20, 2012
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