for example, when I learn multithreading, I can only write a few simple demo, to write a consumer model. I don"t need it at work. I don"t know the specific application scenarios. For example, dubbo and springcloud, just say that building a simple demo, with a blog has no functions. If I ask something a little deeper during the interview, I can"t hit it. In this case, how can I expand my personal ability?
how complex requirements can be encountered when you are self-taught, so you can't continue to add, delete, modify and search basically. After all, most businesses are really enough from DAO to Controller . CRUD is enough (design patterns, architecture design, layering, etc., are not discussed here, it all depends on the scenario).
it is said that design patterns are good, convenient for refactoring, improving abstraction, and decoupling, but the problem to be solved is not of that magnitude. According to copy a demo , you may still not know what is good about this thing.
so the personal practice is to choose a framework (see your description, Spring Framework should be more appropriate) before meeting more complex requirements, read the official documentation to understand how it exposes interfaces to the outside world, and the names of those interfaces can generally be seen as what design patterns it uses to achieve decoupling. So it can be said to kill many birds with one stone: learn more about Spring , observe the practice of design patterns, and trace the source code to exercise debugging skills.
of course, Spring this kind of thing is too big and complete, even a Hello World is a twist, and a Context Loader is very complicated, so let's start with the earlier version.
Spring Framework
this is the earliest Spring Framework that I can find.0.9version 6.61m is not afraid.
see what's inside:
compiled jar, can ignore
download spring-framework-0.9.zip , extract, and import IDE.
/ samples/skeletons/webapp-minimal this is the smallest skeleton sample ( pagedlist and petclinic are translated to combine some sample scenarios, while webapp-aop and webapp-hibernate introduce some external packages or something)
go straight to / WEB-INF/web.xml , and you can see
Writing demo is just using the basics over and over again, and you'll forget it if you don't use it for a while. The best way is to participate in a certain degree of difficult development, such as going to Github to pull a few projects that are currently understandable but more difficult to study, look at them before you change them, and achieve some of your own functions. After completing one, you will find that the details will be improved.
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