The integration and configuration steps of the NLOG4J framework in the Java library
The integration and configuration steps of the NLOG4J framework in the Java library
NLOG4J is a popular Java log framework that helps developers perform flexible log records and management in the application.This article will introduce the integration and configuration steps of the NLOG4J framework in the Java class library, and the corresponding Java code example.
Step 1: Add NLOG4J dependencies
First, you need to add NLOG4J dependency items to the project construction file.Suppose you are using Maven building tools, adding the following dependencies to the pom.xml file of the project:
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.14.1</version>
</dependency>
This will ensure that when the project is constructed, the NLOG4J framework and its core components are introduced correctly.
Step 2: Create log4j2.xml configuration file
Next, you need to create a configuration file called log4j2.xml and place it under the class path.This file is used to configure the logging behavior of the NLOG4J framework.Below is a simple log4j2.xml configuration file:
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="INFO">
<Appenders>
<Console name="Console" target="SYSTEM_OUT">
<PatternLayout pattern="%d %-5p [%t] %C{2} (%F:%L) - %m%n"/>
</Console>
</Appenders>
<Loggers>
<Root level="info">
<AppenderRef ref="Console"/>
</Root>
</Loggers>
</Configuration>
In the above configuration file, a output target called Console is defined, and the log information is output to the standard output stream of the system.At the same time, the format of the log output is configured using the patternLayout.The root level is set to INFO, which means that only the log information of the INFO level and above will be recorded.
You can modify the configuration file according to your needs, such as adding file output targets, setting log levels, etc.
Step 3: Use nlog4j in the Java class
It is very simple to use NLOG4J in the Java class.You only need to introduce LOG4J -related packages and create a logger object to start recording logs.The following is an example code:
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
public class MyClass {
private static final Logger logger = LogManager.getLogger(MyClass.class);
public static void main(String[] args) {
logger.info ("This is a information log");
logger.warn ("This is a warning log");
logger.error ("This is a wrong log");
}
}
In the above examples, we first created a logger object through the GetLogger method of the Logmanager class.We can then record different levels of log information using different methods (such as INFO, Warn, ERROR).
After running the above code, the corresponding log information will be output according to the configuration in log4j2.xml.
Through the above integration and configuration steps, you have successfully integrated the NLOG4J framework into the Java class library, and can flexibly record and manage log information as needed.You can further understand the various functions and configuration options of the NLOG4J framework according to the actual project needs, and customize according to your own needs.
