java-servlet--"How to read a resource file from a common Java program in the 12-web application." MP4 "in doubt.

\ fifth day-servlet development and ServletConfig and ServletContext object \12-web How to read a resource file from a common Java program in the application. mp4;

Multi-layer, DAO in order to get the configuration parameters in the resource file;

Get ServletContext in the Doget method in the servlet
ServletContext context = This.getservletcontext ();
The context object is then passed to the DAO, so the coupling is high and unreasonable.

So: How to pass the class loader

This properties is used in multiple places, typically in static code blocks:

　　

To be wrapped with a try, not to be thrown, and eventually changed to:

　　

10 of this video: 28 seconds, why this exception can not be thrown directly, try to catch out; what is the difference?

But the method above has drawbacks: it is not possible to get configuration data that is updated in real time, "The ClassLoader is loaded only once when the class is created"

　　

java-servlet--"How to read a resource file from a common Java program in the 12-web application." MP4 "in doubt.