The best practical method of Logging API framework in the Java class library
Log is a very important part of the software development process. It can help developers track and debug programs, as well as recording the operation status and abnormalities of the system.There are many popular log frameworks in the Java class library, such as the Java.util. Logging built by LOG4J, LOGBACK and Java.In order to maximize the effect of the log framework, the following are the best practical methods to use the log framework in the Java class library.
1. Use the appropriate log level:
The log level can be configured according to the detailed degree required.Generally speaking, the following levels can be used: TRACE, Debug, Info, Warn, ERROR, FATAL (most serious).During the development process, appropriate log levels can be set as needed to reduce the redundant and excessive records of the log.
2. Select the right log framework:
When choosing a log frame, you should choose according to the needs of the project and the preferences of the development team. The most common choice is log4j and logback.These two frameworks have similar configurations and APIs, which can be selected as needed.
3. Configure log output according to the needs:
The log output can be configured by the configuration file to determine the output of the log to the console, file or other locations.You can choose the appropriate configuration method according to the project requirements and ensure that the appropriate log level is configured.
4. Appropriate log format:
Use the appropriate format in the log output to facilitate viewing and analyzing the log.Generally, the log format includes time stamps, log levels, class names, method names, and log messages.You can use the appropriate placement to format the log message to improve the readability of the log.
The following is an example code using log4j:
First, you need to add LOG4J dependence.
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.17.1</version>
</dependency>
Next, create a configuration file log4j2.xml and place it in the resource directory of the project.
<Configuration status="WARN">
<Appenders>
<Console name="Console" target="SYSTEM_OUT">
<PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
</Console>
</Appenders>
<Loggers>
<Root level="debug">
<AppenderRef ref="Console"/>
</Root>
</Loggers>
</Configuration>
Finally, use the logger object in the Java code for log records.
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.LogManager;
public class MyClass {
private static final Logger logger = LogManager.getLogger(MyClass.class);
public void doSomething() {
logger.debug("Debug message");
logger.info("Info message");
logger.warn("Warning message");
logger.error("Error message");
}
}
Through the above examples, you can implement the best practice of the log framework in the Java library.These methods can help you record logs and provide strong debugging and tracking tools to better develop and maintain software systems.
