Use Apache Commons Logging to implement log management in the Java class library
Use Apache Commons Logging to implement log management in the Java class library
Overview:
When developing the Java class library, in order to better debug and review the code, we often use log records to track the execution of the code and output related information.Apache Commons Logging is a log record tool provided by the Apache organization. It provides a universal log record API that can integrate with other popular log recorders such as log4j and SLF4J.This article will introduce how to use Apache Commonts Logging to implement log management in the Java class library.
step:
1. Import the Apache Commons logging library: First of all, we need to guide the Apache Commons logging library into our Java project.It can be achieved by adding the following dependencies to pom.xml files:
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.2</version>
</dependency>
2. Create a log recorder: Using Apache Commons Logging, we can create a log recorder in the following way:
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class MyClass {
private static final Log log = LogFactory.getLog(MyClass.class);
public void myMethod() {
log.debug("Debugging information");
log.info("Informational message");
log.warn("Warning message");
log.error("Error message");
log.fatal("Fatal error message");
}
}
3. Configuration log recorder: Apache Commons Logging provides multiple log levels that can be used to control the severity of the output.Set the log level by setting up the Properties file in the project or using other configuration methods.For example, in the log4j.properties file, you can add the following configuration:
properties
log4j.logger.com.example=INFO
This will set the log level to INFO and only output the Info level and higher level log messages.
4. Record log: Once the configuration is configured and create a log recorder, we can use the log record in the code.The commonly used log levels are: Debug, Info, Warn, ERROR and FATAL.Here are examples of some examples of recording logs using Apache Commonts Logging:
log.debug("Debugging information");
log.info("Informational message");
log.warn("Warning message");
log.error("Error message");
log.fatal("Fatal error message");
It should be noted that the log message will be printed to the console by default.If you need to output log messages to other places, you can use the implementation of other log recorders, such as log4j or SLF4J.
Summarize:
Apache Commons Logging provides a universal log record API that helps us better manage the logs in the Java library.Using Apache Commons Logging, we can easily create a log recorder, configure log level, and record various log messages.This enables us to better debug and review code and better understand the execution of the code.
