Use the 'Logging Api' framework in the Java class library for error tracking

Use the 'Logging Api' framework in the Java class library for error tracking When developing and maintaining large Java applications, error tracking and log records are very important.Java's Logging API provides a flexible logging framework that can easily record the running process and error of the application.This article will introduce how to use the Java Logging API to achieve error tracking and log records. 1. Introduce Java Logging API First of all, you need to use the Java Logging API to introduce it into the project.Java Logging API is part of the Java standard library, so there is no additional dependencies.You can access the API function by using a class in the java.util.logging package. import java.util.logging.Logger; 2. Create a logger object In the code, a logger object can be created through the Logger class.The Logger class provides many useful methods that can be used to record log information of different levels.You can create different logger objects for different modules and classes to better organize and manage logs. private static final Logger logger = Logger.getLogger(YourClassName.class.getName()); In the above code, a Logger object is created through the logger.getLogger () method, and a unique name is specified for it.The full -limited name of the getName () method returns the class as the name of the logger.This logger object can be used in subsequent log records. 3. Record log The logger class provides a series of log () methods that can be used to record log information of different levels.Here are some commonly used log levels and their corresponding methods: -SEVERE: serious error, use logger.severe () -Warning: Warning information, use logger.warning () -INFO: General information, use logger.info () -CONFIG: Configure information, use logger.config () -Fine: Details, use logger.fine () -Finer: More detailed information, use logger.finer () -Finest: Very detailed information, use logger.finest () For example, use the logger.severe () method to record the serious error log information: logger.severe("An error occurred: " + errorMessage); 4. Configuration log Java Logging API provides a default log configuration that can be configured by using the Logmanager class in the code.However, it is generally recommended to use external configuration files to configure logs such as logging.properties files. The logging.properties file contains some attributes and values, which can be used to configure the format and output location of the log.The configuration file can be loaded when the application starts. java.util.logging.config.file=logging.properties In the above code, the path of the logging file is specified by setting java.util.logging.config.file. 5. Output log to file By default, the log information is output to the console.But in the production environment, we are more willing to output log information into files.You can output the log into the file by configure the logging.properties file. # Output to file handlers=java.util.logging.FileHandler # The path and file name of the file output java.util.logging.FileHandler.pattern=/path/to/logfile.log # The maximum size (byte) of the log file java.util.logging.FileHandler.limit=50000 # java.util.logging.FileHandler.count=5 In the above configuration, the path and name of the log file are specified by setting java.util.logging.filehandler.pattern property.You can use mode%g to name the increasing number of multiple log files.You can also control the size of the log file by setting java.util.logging.filehandler.limit.When the log file reaches the largest size, the system will automatically create a new log file.You can also limit the number of log files by setting java.util.logging.filehandler.Count property. Summarize Using the logging API framework in the Java library can easily achieve error tracking and log records.You can record the log information of different levels through the Logger object, and the log information can be output into the file through the configuration file.This not only helps track errors during the development and maintenance process, but also provides detailed monitoring and analysis of the operating conditions of the application. references: - Java Logging Overview: https://docs.oracle.com/en/java/javase/14/core/java-logging-overview.html - Logger class documentation: https://docs.oracle.com/en/java/javase/14/docs/api/java.logging/java/util/logging/Logger.html