SLF4J API module: fast entry guide

SLF4J API module: fast entry guide SLF4J (Simple Logging Facade for Java) is a log record framework for Java applications.It provides a simple and unified log record interface that allows applications to use different log records to implement during runtime.The design goal of SLF4J is to shield the logs to achieve details so that the application can easily switch the logging framework without the need to modify the source code. This guide will introduce the basic use of the SLF4J API module.First of all, you need to add SLF4J dependency library to the application.You can add the following dependencies in Maven or Gradle: <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>1.7.32</version> </dependency> Next, use SLF4J in your Java code for log records.First, you need to import the Logger class of the SLF4J: import org.slf4j.Logger; import org.slf4j.LoggerFactory; Then you can use loggerFactory to get the logger instance: Logger logger = LoggerFactory.getLogger(YourClass.class); In the above code, YourClass is the category you want to record the log.Through the Logger instance, you can use different logs for log records.Common log levels include Trace, DEBUG, Info, Warn and Error.Here are some examples: logger.trace("This is a trace level log"); logger.debug("This is a debug level log"); logger.info("This is an info level log"); logger.warn("This is a warning level log"); logger.error("This is an error level log"); You can choose the appropriate log level according to actual needs.The log record message can contain variables, and can transmit variable values in the mode of placeholders.For example: String name = "Alice"; int age = 25; logger.info("User {} is {} years old", name, age); In the above code, {} is a placeholder, which will be replaced with value of name and Age in order.This method can avoid the performance expenses generated during string stitching. In addition to the basic log records, SLF4J also provides some other features, such as MDC (Mapped Diagnostic Context) and Marker.MDC allows you to pass the context information when recording logs, such as request ID or user ID.Marker can be used to mark specific log records. To sum up, the SLF4J API is an easy -to -use log record framework, which provides a unified interface to record the log of the application.Through SLF4J, you can easily switch different log record implementations, and reduce the attention of log implementation details.Hope this article will help the SLF4J API module quickly. In order to better understand the use of SLF4J, you can refer to SLF4J's official documentation and related example code.