Learn from the 'Logging API' framework in the Java class library
Logging API framework in the Java class library
Overview:
When developing Java applications, it is very important to record the execution and status information of the application.Java provides a framework called Logging API for the purpose of logging.Logging API provides a flexible and scalable way to record the log of the application and can record the logging behavior through configuration.This article will introduce the characteristics of the Logging API framework in the Java library and demonstrate the method of use through code examples.
Features of Java Logging API:
1. Log level: Logging API defines seven logs, from high to low, Severe, Warning, INFO, Config, Fine, Finer, and Finest.Developers can choose appropriate levels as needed to control the details of the log.
2. Log recorder: Logging API uses the logger class as the log recorder.Developers can use Logger to record log messages at different levels, and can create multiple log recorders in the code as needed.
3. Log processing program: Logging API uses the handler class to define the way of processing logs.Developers can use different Handler to implement log messages, such as writing logs to files, sending emails, or printing to console.
4. Log format: Logging API allows developers to define the format of log messages.Developers can customize the output format of log messages, including date time, log level, thread information, etc.
5. Filter: Logging API provides Filter interface, developers can use filters to filter log messages that are not eligible.Filters can screen log messages according to different standards, such as log levels, source logger, etc.
Example code using logging API:
1. Create a logger object:
import java.util.logging.Logger;
public class LoggingExample {
private static final Logger logger = Logger.getLogger(LoggingExample.class.getName());
public static void main(String[] args) {
logger.info("This is an information message");
logger.warning("This is a warning message");
}
}
2. Configure log processing program:
import java.util.logging.ConsoleHandler;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.Logger;
public class LoggingExample {
private static final Logger logger = Logger.getLogger(LoggingExample.class.getName());
public static void main(String[] args) {
// Create Consolehandler object
Handler consoleHandler = new ConsoleHandler();
// Set the log level
consoleHandler.setLevel(Level.ALL);
// Add Consolehandler to Logger
logger.addHandler(consoleHandler);
logger.info("This is an information message");
logger.warning("This is a warning message");
}
}
in conclusion:
Logging API is a framework used in the Java library for logging, which provides a flexible and scalable log record mechanism.Developers can choose different log levels, configure different processing procedures, and formats and filters that define log messages according to their needs.Using the logging API can better manage and monitor the execution and status information of the application, thereby improving the reliability and maintenance of the application.
