Application of LOGBACK core module in the Java library

LOGBACK is a framework for Java applications to provide flexible and efficient log records.It was founded by CEKI Gülcü and the successor of the LOG4J project. The core modules of logback include Logger, APPENDER and Layout. Logger is the basic element of logback, which is responsible for recording logs.Logger can be configured according to the needs of the application, and can set different logs (such as debugging, information, warnings, errors, etc.).The following is an example of using a logger to record logs: import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class MyApp { private static final Logger logger = LoggerFactory.getLogger(MyApp.class); public static void main(String[] args) { logger.debug("Debug message"); logger.info("Info message"); logger.warn("Warning message"); logger.error("Error message"); } } In the above example, we use the logger by introducing `organlf4j.logger` and` organlf4j.loggerFactory` classes to use logger.Then, we created a class called `myapp` and obtained a logger instance in it.Finally, in the Main method, we use Logger to record different levels of log messages. Appender is another core component of LOGBACK to control where to output log messages.Logback provides many different types of APPENDER, including consoles, files, databases, syslogs, etc.The following is an example of output log messages to files: <configuration> <appender name="fileAppender" class="ch.qos.logback.core.FileAppender"> <file>app.log</file> <encoder> <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{35} - %msg%n</pattern> </encoder> </appender> <root level="debug"> <appender-ref ref="fileAppender" /> </root> </configuration> The above example is a logback configuration file. We output the log message into a file named `app.log`.The `ENCODER>` element in the configuration file defines the format of the log message.Through `%d {hh: mm: ss.sss}` We designated the format of the timestamp, `%thread]` represents the thread name, `%-level` indicates the log level,`%logger {35} `indicates logger indicating loggerThe name shows up to 35 characters, `%msg%n` indicates the message itself and the row.Finally, we set the log level of the root logger to debug through `<root level =" debug ">` and associate it to the `FileAppender`. Layout refers to the mechanism that converts the log event into a string.Logback provides multiple layout implementation, which can be selected as needed.In the above example, we used the ` %d {hh: mm: ss.sss} [ %thread] %-5Leveel %logger {35} - %msg %n` format to generate the string of the log message. The application of the core module of logback in the Java class library is introduced.It provides a powerful log record function, which can be configured and customized according to the needs of the application.Whether it is a large enterprise application or a small personal project, LOGBACK is a logging solution worth considering.