What does the Java backend do?

Whether it is a single application or a distributed application, the backend is nothing more than doing one thing, receiving data from the front end, and then storing it in the database according to a certain data format.

The entire process can add cache from the front end→backend→database, and store some commonly used data in it to reduce access time and thereby improve response speed.

The commonly used backend development model can be divided into three layers. From bottom to top, they are the dao layer, the service layer and the controller layer. The dao layer mainly deals with the database, adding, deleting, modifying and checking, and the service layer handles some business logic. The controller layer mainly interacts with the front-end, receives data from the front-end and returns the data to the front-end.

The entire system has a clear division of labor, which is the basis for good display and interaction of the front-end.

Front-end and back-end The classic scenarios of interaction include the following:

Form submission

Receives data from the front end, then submits it to the background through ajax, and the background returns success or failure.

Paging

Query data from the background and then display it in pages

Search

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Verification code verification

Send the verification code via mobile phone or email, generate a token and store it in the cache , and then proofread it with the verification code entered at the front end

The so-called development is nothing more than using code to implement business logic. The code part needs to be familiar with the basic syntax of the language and common tools, and then hook it up with the business logic , find practical application scenarios, extract common things from many business scenarios, and find out what the core essence of the problem is. Only in this way can you improve the efficiency of your own development.

In addition, you must understand Keep confidence in yourself and know that most of the problems you encounter have been encountered by others. Don’t reinvent the wheel. Learn to use search engines such as Google to find the best practices for a problem and think about and use them. Keep an eye on new things. If you are curious and diligent in hands-on practice, over time, you will eventually become a very powerful programmer.

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