How to implement log records by 'logging api' framework
How to implement log records by 'logging api' framework
The log record is a very important part of the software development process. It helps developers to track the operating status of the application, investigate problems and perform performance optimization.'Logging API' (logging application interface) is a commonly used framework that is convenient for logging in the application.
The 'Logging API' framework provides a structured way to record the application and status information of the application.It allows developers to send different levels of log messages (such as debugging information, warnings, errors, etc.) to different output targets, such as consoles, files, databases, etc.The following is the way to implement the logging of the "Logging API" framework:
1. Import log library: First, the appropriate log library needs to be introduced in the project.Common log libraries include log4j, Logback and Java.util. Logging, etc.These libraries can be added to the project dependence through building tools such as Maven and Gradle.
2. Configure log recorder: configure a log recorder object in the application.The log recorder is the core component of the 'Logging API' framework, which is responsible for receiving and processing log messages.You can use the configuration file or programming method to configure the log recorder.The following is an example of configuration using the logback framework:
<!-- logback.xml -->
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{yyyy-MM-dd HH:mm:ss} %-5level %logger{36} - %msg%n</pattern>
</encoder>
</appender>
<root level="debug">
<appender-ref ref="STDOUT" />
</root>
</configuration>
In the above example, a console output target called the console called `Stdout` is defined, and the output format is specified.Then configure a log recorder with a root level, and add the console output target to the root recorder.
3. Record log message: By using the log recorder object, record the log message at different locations of the application.You can use different levels of log methods, such as `debug ()`, `info ()`, `warn () and` error () `, etc., according to the importance and priority of the message.Below is an example of logging using the logback framework:
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class MyClass {
private static final Logger logger = LoggerFactory.getLogger(MyClass.class);
public void doSomething() {
logger.debug("Debug message");
logger.info("Info message");
logger.warn("Warning message");
logger.error("Error message");
}
}
In the above example, obtain a log recorder object through the `loggerFactory`, and use different levels of logs to record different types of log messages in the log method of the` dosometHing () `method.
4. Run application: During the application of the application, the log recorder will receive the log message and send it to the output target of the configuration.According to the configuration log level, the output of the log message can be filtered and controlled.For example, in the above example, the root level is set to `Debug`, then the log message of all levels will be output.If the root level is set to the `Inf`, then the log message of the` Debug` level will not output.
To sum up, the 'Logging API' framework is a convenient and easy -to -use log record tool that helps developers to manage and track the operating status of applications.By importing appropriate log libraries, configuration log recorders and using different levels of log methods, a flexible and configurable log record function can be realized.
Reference materials:
- [LogBack official document] (http://logback.qos.ch/documentation.html)
- [SLF4J Official Website] (http://www.slf4j.org/)
