How do you use logging in your code?

There are actually two ways to do this.
The first is actually a way that was used a long time ago. You just need to add the following to the code:

private final Logger logger= LoggerFactory.getLogger(DemoApplicationTests.class)

This way is obviously more frivolous, if every class to add it is not very low.
A second
lombok solves this problem for us without having to write a single line of code for every class.
To use lombok, you need to add the following dependencies:

<dependency>
    <groupId>org.projectlombokgroupId>
    <artifactId>lombokartifactId>
dependency>

is also very simple. You just need to annotate the class with a comment @Slf4j as follows:

@Slf4j
class DemoApplicationTests {
@Test
public void test(){
log.debug("输出DEBUG日志.......");
}
}

logger4j is one of the most widely used logging libraries. I suggest you learn how to use it. You use it all the time. There's a lot of information on the Internet, Or I recommend to you: < a href = "https://blog.csdn.net/babdpfi/article/details/127350198" target="_blank"> https://blog.csdn.net/babdpfi/article/details/127350198

Give it up!! May you come into a good fortune