How to configure and customize SCALA Logging SLF4J framework in the Java class library
How to configure and customize SCALA Logging SLF4J framework in the Java class library
Overview:
Scala Logging is a SCALA log framework based on SLF4J, which provides a convenient way to record log records in the Scala application.This article will introduce how to configure and customize the SCALA Logging SLF4J framework in the Java library.
Step 1: Add dependencies
First, add Scala Logging SLF4J dependencies in your Java -class library building tools (such as Maven or Gradle).In the Build.gradle file, add the following:
dependencies {
implementation 'com.github.typesafe:scala-logging_2.13:3.9.4'
}
Step 2: Configure log recorder
Next, create a Java class as the entrance point of your application and configure the log recorder.In this category, you need to do the following:
Import related classes and methods:
import com.typesafe.scalalogging.Logger;
import org.slf4j.LoggerFactory;
Create a logger object:
private static final Logger logger = Logger.apply(LoggerFactory.getLogger(YourClass.class));
Use the logger object to perform a log record:
logger.info("This is an info message.");
logger.error("This is an error message.");
Step 3: Configure log level
By default, Scala Logging uses SLF4JLOGER to record the log, which will print all levels of log messages.In order to customize the log level, you can specify the appropriate log level in the configuration file.Taking logback as an example, create a file called "logback.xml", place it under the class path, and then define the following in this file:
<configuration>
<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%date{yyyy-MM-dd HH:mm:ss} %-5level %logger{36} - %msg%n</pattern>
</encoder>
</appender>
<root level="info">
<appender-ref ref="CONSOLE" />
</root>
</configuration>
In this configuration file, we set up the root log level "Info", which means that only the "Info" level and higher level log message will be recorded.You can customize the root log level as needed.In this example, we also define a log additional called "Console", which prints the log message to the console.
Step 4: Custom logic format
If you want to customize the format of the log message, you can modify the "pattern" element in the above configuration file.You can use different markers in the "Pattern" element to represent the date, log level, log name and log message.For more marking options, you can refer to the logback document.
For example, if you want to modify the date format to "yyyy/mm/dd HH: mm: ss", change the relevant part in your configuration file to:
<pattern>%date{yyyy/MM/dd HH:mm:ss} %-5level %logger{36} - %msg%n</pattern>
Then restart the application, you will see the log message recorded in the new date format.
in conclusion:
Through this article, you learn how to configure and customize the SCALA Logging SLF4J framework in the Java library.You can use this powerful log framework to simplify and improve the log records in your Java project.Through appropriate configuration and customization, you can meet your specific needs and get clear and useful log messages.
Java code example:
import com.typesafe.scalalogging.Logger;
import org.slf4j.LoggerFactory;
public class YourClass {
private static final Logger logger = Logger.apply(LoggerFactory.getLogger(YourClass.class));
public static void main(String[] args) {
logger.info("This is an info message.");
logger.error("This is an error message.");
}
}
