Master the custom log format and output method in Apache Commonts Logging
The custom log format and output method are one of the very common needs in Apache Commons Logging (Commons Logging).Commons Logging is a general logon facade, which provides a simple log interface that can switch and use between different log implementation frameworks.
Commons Logging supports the logo format and output method through the configuration file.Below we will introduce how to perform these custom configurations and provide corresponding Java code examples.
First of all, we need to introduce the relevant dependence of Apache Commons Logging in the project.In the Maven project, you can add the following dependent configuration to the POM.XML file:
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.2</version>
</dependency>
Next, we need to create a configuration file to define custom logo formats.Create a file called Commons-Logging.properties in the resource directory of the project, and add the following content:
properties
org.apache.commons.logging.Log=org.apache.commons.logging.impl.SimpleLog
org.apache.commons.logging.simplelog.showdatetime=true
org.apache.commons.logging.simplelog.dateTimeFormat=yyyy-MM-dd HH:mm:ss
org.apache.commons.logging.simplelog.log.customLogger=debug
org.apache.commons.logging.simplelog.log.com.example.MyClass=info
The above configuration file specifies the use of Simplelog as a log output implementation, and sets the format of the display date and time.At the same time, we also define a custom log recorder called CustomLogger with log level of Debug.In addition, we also specify the log -level INFO for the com.example.myclass class.
Next is the example of the Java code.We first define a custom logger class:
package com.example;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class MyClass {
private static final Log log = LogFactory.getLog("customLogger");
public static void main(String[] args) {
log.debug("This is a debug message");
log.info("This is an info message");
log.error("This is an error message");
}
}
In the above example, we obtained an instance of the custom log recorder Customlogger through logfactory.getLog ("CustomLogger").
Next, we can run the MyClass class, which will control the output of log output based on the log level in the above configuration file.In the console, we can see a similar output:
2021-01-01 12:34:56 [DEBUG] com.example.MyClass - This is a debug message
2021-01-01 12:34:57 [INFO] com.example.MyClass - This is an info message
2021-01-01 12:34:58 [ERROR] com.example.MyClass - This is an error message
In the above output, it includes information such as date, time, log level, class name and log message. This is exactly the output format defined by our custom configuration.
In summary, through custom configuration files and using Apache Commons logging, we can flexibly control the output format and method of logs.By using the custom Logger recorder, we can set different logs according to different needs, and define the format of the log through the configuration file to facilitate unified management and reuse.This flexible configuration method can easily cope with logs in different projects and environment.
