Use the 'Logging API' framework in the Java Class Library for log records

Use the 'Logging API' framework in the Java class library for log records During software development, log records are a vital task.By recording the operating status, abnormalities, warnings, and other information of the application, developers can help developers quickly diagnose and solve problems, and provide good operation and maintenance support in the production environment.The 'Logging API' framework in the Java class library is a widely used log record solution that provides flexible configuration options and powerful log records. This article will introduce how to use the "Logging API" framework for log records and provide a complete example code and related configuration. ## Logging API framework 'Logging API' is part of the core library of the Java platform, which contains some classes and interfaces for recording logs.It provides a custom log recorder, processor and filter, which can be flexibly configured according to the needs of the application.The 'Logging API' framework can output log records to different targets, such as console, files, databases, etc., and can also be filtered according to different logs. ## Use Logging API to perform a sample code for log records The following is a simple example code, demonstrating how to use the 'Logging API' framework for log records. import java.util.logging.Level; import java.util.logging.Logger; public class LoggingExample { // Create a logger instance private static final Logger LOGGER = Logger.getLogger(LoggingExample.class.getName()); public static void main(String[] args) { Logger.info ("This is a information log record."); try { int result = 10 / 0; } catch (ArithmeticException e) { // Record an abnormal log Logger.log (level.severe, "Dive zero abnormalities.", E); } } } In the above example, we first created a `Logger` instance to record the log.Through the method of `logger.getLogger (), we passed a unique name to identify the log recorder.Usually, we can use the name of the current class as the identifier. In the `Main` method, we first used the` Logger.info () method to record a information -level log.Then, a `ArithmeticException` is abnormal in an attempt to remove it with zero operation.In order to record the abnormal information into the log, we used the `logger.log () method, and specified the log level to` level.severe`, and passed the abnormal object. ## Logging API framework configuration To use the "Logging API 'framework for log records, we need to perform some configuration.In Java, log record configurations are usually provided in the form of attribute files, such as `logging.properties`.Here are a sample of `logging.properties` file content, demonstrate some common configuration options: # Define the processor and filter handlers=java.util.logging.ConsoleHandler, java.util.logging.FileHandler filter=java.util.logging.Filter # Configuration processor java.util.logging.ConsoleHandler.level=INFO java.util.logging.ConsoleHandler.formatter=java.util.logging.SimpleFormatter java.util.logging.FileHandler.level=WARNING java.util.logging.FileHandler.pattern=myapp-%u-%g.log java.util.logging.FileHandler.limit=50000 java.util.logging.FileHandler.count=1 java.util.logging.FileHandler.formatter=java.util.logging.XMLFormatter # Configure the root log recorder .level=INFO In the configuration file above, we define two processors: `Consolehandler` and` Filehandler`.`Consolehandler` output the log to the console, and` Filehandler` output the log to the file.We can also add other processors as needed.The level and format of the configuration can also be adjusted according to the needs. We can also specify the configuration file to be used by setting the system attribute.For example, the following commands can be used in the command line: java -Djava.util.logging.config.file=logging.properties LoggingExample ## in conclusion It is a simple and powerful way to use the 'Logging API' framework in the Java library.By configured the appropriate processor and filter, we can record the logs flexibly according to the needs of the application and output it to the appropriate goal.This framework also provides a wealth of log levels and formatting options, allowing developers to better monitor and analyze the operating conditions of the application.