Wisdom Podcast Javaweb Day03

ServletContext

This class is mainly about ServletContext the web domain (which can be seen), and the web creates a unique ServletContext domain object when it starts.

Effect: 1. Use for web domain sharing data

1.1 Data sharing by setting domain properties (SetAttribute) and getting domain properties (getattribute)

2. Implement forwarding

2.1 The difference between forwarding and redirection

Forward a request once response (get forward object RequestDispatcher, through the forward method to implement forwarding); REDIRECT two requests two responses

3. Read the resource file

3.1 Get the real file path (get the real path of the file through the Getrealpath method in the parent class)

Wisdom Podcast Javaweb Day03