How to use the "Utilities Logging" framework record day in the Java library
How to use the "Utilities Logging" framework in the Java library to record logs
The log is very important for debugging and monitoring the operation of the Java program.The "Utilities Logging" framework in the Java library provides a flexible and easy way to use it to record and manage log information.This article will introduce how to use the "Utilities Logging" framework in the Java library to record logs to record logs and provide some example code to help you better understand its usage.
1. Import "Utilities Logging" framework in the Java library
Before starting, you need to ensure that the "Utilities Logging" framework has been added to the dependency item of the Java project.You can import the framework by maven or directly introduce jar packages.The following is an example code that uses Maven to add dependencies:
<dependencies>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.32</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-simple</artifactId>
<version>1.7.32</version>
</dependency>
</dependencies>
Among them, `SLF4J-API` is the core API of the" Utilities Logging "framework, and` SLF4J-SIMPLE` is a simple implementation it provides.
2. Create and configure the log recorder
In the project, you need to create a log recorder that will be responsible for the log information of each part of the program.You can use the following example code to create a log recorder:
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class MyLogger {
private static final Logger logger = LoggerFactory.getLogger(MyLogger.class);
public void logInfo(String message) {
logger.info(message);
}
public void logError(String message, Throwable throwable) {
logger.error(message, throwable);
}
}
In the above sample code, we obtain a log recorder by calling the `loggerFactory.getLogger (mylogger.class)`, and use the `Logger.Info` and` Logger.error` in the method of `loginfo` and` Logerror` methods, respectively.Record log information of different levels.
3. Use a log recorder in the code
In your Java library, you can use the created log recorder to record the log information of each part.Here are some example code, which shows how to use the log recorder to record different log information:
public class MyLibrary {
private static final Logger logger = LoggerFactory.getLogger(MyLibrary.class);
public void method1() {
logger.debug("Debug information for method1");
logger.info("Information for method1");
}
public void method2() {
try {
// Some business logic
} catch (Exception e) {
logger.error("Error occurred in method2", e);
}
}
}
In the above sample code, the use of the `Mylibrary` class to obtain a log recorder in the same way as before, and use the recorder to record the log information of different levels of log information in the` Method1` and `Method2` methods.
Fourth, configuration log framework
The "Utilities Logging" framework provides flexible configuration options, and you can customize the output method and level of the log according to your needs.Usually, you need to create a file called `LogBack.xml` and place it in the` Resources` directory of the project.The following is a basic example of `logback.xml` configuration:
<configuration>
<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
</encoder>
</appender>
<root level="info">
<appender-ref ref="CONSOLE"/>
</root>
</configuration>
In the above example code, we are equipped with an output called `console` and specify the output format and level.Here, the log level is set to `Info`, which means that only the log information of the` Info` level and above will be exported to the console.
5. Run and view log information
After configured the log framework, you can run the project and observe the log information output from the console.According to your configuration, only the log information of the designated level will be displayed.By observing log information, you can understand the operation of the program, as well as positioning and solving potential problems.
In summary, by using the "Utilities Logging" framework in the Java library, you can easily record and manage log information.Through the correct configuration and use, the log will be a powerful tool for your debugging and monitoring procedures.I hope this article can help you better understand how to use the "Utilities Logging" framework in the Java class library to record the log.
