1. Before learning summary
javase
Declare variable data stored in memory to be processed
Logical structure data process loop structure
The method of packaging function code
Object-oriented classes and objects for a process and data integrity of the package
The data acquired from the local want (hard disk), then the IO stream is introduced, it can be obtained from the local data
Local data is disorganized and needed a manager
So with JDBC database and the database connection
Data can not only be a person to use and let other people have been waiting for, so the introduction of multi-threading,
Everything is ready, but you can not just stick console, need to interact with the page a good point. So there has been html
Page appears, and it can add a little pattern, so there css, js
Write dead soulless interface, database and communication needs, so with jsp + servlet + jdbc this set
When people CRUD found that many of the operations are repeated, for people (programmers) very friendly, so there is a framework
Framework encapsulates a lot of class, belong to a semi-finished products, will encapsulate many operations, leaving the programmer needs to fill in the place
Appearance framework improves programmer productivity, but can be hard JVM. Like a template has been written, but certainly not as a precise precision poverty to step back now ..
Once the stuff on-line program, deployed the price to go to modify the source code can be large. So people will probably change written in xml (profile), as long as you can modify the configuration file control program.
The program runs like a train set off, you want to change the track we will need to stop the train, moving on to the next track, which costs little, ah
Profiles like sub-track, when you need to change as long as the joint, you can change route without stopping, pleasant