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The main content of this article is to explain "what is the Spring condition Note". Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn "what is the Spring condition Note"!

Conditional annotation

The condition note is that the configuration will not take effect until certain conditions are met. We take the Linux and Windows operating systems as examples, the directory command is ls in the Linux system and dir in the Windos system to achieve different functions according to the current operating system.

1. Display directory command interface

First define an interface that displays directory commands.

2. Implement the interface

Implement the examples under Linux and Windows respectively

Implement interface Condition

Implement the conditions under Linux and Windows

Configure Bean

test

The results show that

Multi-environment switching

In company development, we need to quickly switch between development and production environments. In this case, we can use Profile in Spring to solve this problem, as follows:

You can see that the bottom layer of Profile annotations is also implemented by Condition, and then define a data source class DataSource

Configure Bean

Load configuration classes, test results

You will find that when you set up the prod environment, the data source is the parameter under the prod environment. It is proved that the multi-link switching is realized.

At this point, I believe you have a deeper understanding of "what is the Spring condition comment". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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