In the Java class library, using the SCALA LOGGING SLF4J frame step

Steps to use the SCALA LOGGING SLF4J framework in the Java library SCALA Logging SLF4J is a simple bridge connection framework for logging in the Scala application. It allows you to use SLF4J (SIMPLE LOGGING FACADE for Java) interface to record the log and use different log implementations in the background (such as logback, log4jjwait).In this article, we will introduce how to use the Scala Logging SLF4J framework in the Java class library. Step 1: Add dependencies First, you need to add the Scala Logging SLF4J framework to the dependence of the project.You can complete this operation by adding the following dependencies in Maven or Gradle constructing files: Maven dependence: <dependency> <groupId>com.typesafe.scala-logging</groupId> <artifactId>scala-logging-slf4j_2.12</artifactId> <version>3.9.6</version> </dependency> Gradle dependencies: gradle implementation group: 'com.typesafe.scala-logging', name: 'scala-logging-slf4j_2.12', version: '3.9.6' Step 2: Configuration log implementation Before continuing, you need to choose a Java log implementation (such as logback, log4j, etc.).After choosing your favorite implementation, you need to add it to the dependence of the project. For example, if you want to use logback as a log, you can add the following dependencies to Maven or Gradle to build files: Maven dependence: <dependency> <groupId>ch.qos.logback</groupId> <artifactId>logback-classic</artifactId> <version>1.2.6</version> </dependency> Gradle dependencies: gradle implementation group: 'ch.qos.logback', name: 'logback-classic', version: '1.2.6' Step 3: Create a log recorder In your Java library, you need to create a class for log records.You can use the tool class provided by the SCALA Logging SLF4J to facilitate the creation and use of the log recorder. import com.typesafe.scalalogging.Logger; import org.slf4j.LoggerFactory; public class MyLibraryClass { private static final Logger logger = Logger(LoggerFactory.getLogger(MyLibraryClass.class)); public void doSomething() { // Record log logger.info("Doing something..."); // ... } } In the above example, we use LoggerFactory to obtain the SLF4J log recorder and pass it to the constructor of the Logger tools provided by the SCALA LOGGING SLF4J to create a log recorder.Now, you can use the Logger object in the class method to record the log messages of various levels. Step 4: Configure log level and output format You can configure the log level and output format through the corresponding configuration in the resource file or configuration file of the project. For the logback log implementation, you can create a logback.xml or logback.xml configuration file, and define the required log level and output format in it.Below is a basic example of logback.xml: <configuration> <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender"> <encoder> <pattern>%date [%thread] %-5level %logger{35} - %message%n</pattern> </encoder> </appender> <root level="INFO"> <appender-ref ref="CONSOLE"/> </root> </configuration> In the above example, we configure the log level to Info and define an output format.You can customize formats and other configurations according to the needs. Step 5: Record log Now, you can use the Logger object in the class method to record the log. public void doSomething() { logger.info("Doing something..."); logger.error("An error occurred!"); // ... } In the above example, we use the Logger object to record an INFO -level log and a Error -level log. Summarize By following the above steps, you can successfully use the Scala Logging SLF4J framework in the Java library for log records.This will help you better organize and manage the logs of applications and easily switch or replace the underlying log implementation.