The function and application of the "logging API" framework in the Java class library

The Logging API framework in the Java library is an important tool for achieving logging functions in the application.In software development, log records can help developers track the execution process, debugging failure and monitoring performance of the code.Logging API provides a set of powerful logging mechanisms that can be embedded in the Java application, which can easily perform logging, log -level control and log output control. Logging API provides logging functions in a modular way, using it to set different logs for different modules for applications.This allows developers to accurately control the records of logs as needed to avoid excessive or too little information records. In Java, the core category of Logging Api is Java.util. Logging.logger.The Logger class is a global log recorder that can create specific log record objects in the application.Each log record object has a unique name, which can obtain the corresponding log record object through the static method of the Logger class.Through the Logger object, different logs can be achieved, including Finest, Finer, Fine, Config, Info, WARNING, Severe, etc. Here are a sample code that uses logging API for logging: import java.util.logging.ConsoleHandler; 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) { ConsoleHandler consoleHandler = new ConsoleHandler(); consoleHandler.setLevel(Level.ALL); logger.addHandler(consoleHandler); logger.setLevel(Level.ALL); logger.finest("Finest log message"); logger.finer("Finer log message"); logger.fine("Fine log message"); logger.config("Config log message"); logger.info("Info log message"); logger.warning("Warning log message"); logger.severe("Severe log message"); } } In the above example, the name of the LoggingExample class is created in the above example.Then create a Consolehandler object and set its log level to level.all.Next, add the Consolehandler object to the Logger object, and set the log level of the logger object itself as the level.all, indicating the record of all levels. Finally, different levels of log information are recorded through the Logger object, from Finest to SEVERE.Depending on the log level, the log record will be displayed on the console. In addition to the Consolehandler in the above example, the logging API also provides other types of Handler, which can output logs to different goals, such as files, databases, etc.By configured proper handler, the log record can be output to the specified position. It should be noted that some related configurations need to be performed when using the Logging API.Configure files usually use standard Java property file formats and named Logging.properties.You can specify the position of the configuration file by setting java.util.logging.config.file system attributes.The configuration file defines information such as the name of the log recorder, the name of the Handler, and the log level. You can customize the configuration as needed. In short, the logging API provides a powerful log record framework that enables developers to easily record and manage the logs in Java applications.It provides flexible log -level control and log output control, which can help developers better understand the execution process of the code and perform fault investigation and performance optimization.