How to use the 'Logging API' framework in the Java class library for debugging

How to use the logging API framework in the Java library for debugging Overview: During the development of the Java application, debugging is a very important link.In order to more conveniently obtain the information of the program and solve the potential problems, Java provides the Logging API framework.The Logging API framework can help developers to record the information during runtime and flexibly control the output level of the log as needed.This article will introduce how to use the logging API framework in the Java library to debug and provide some example code. step: 1. Import the logging API framework library: In the JAVA project's dependency management, add the dependency item of the Logging API framework library.Common logging API frameworks include java.util.logging, log4j, SLF4J, etc., and choose the appropriate framework according to personal preferences and project needs. 2. Initialize Logger Object: In the Java class that needs to be debugged, the Logger object must be initialized.The Logger object is the main component used in the logging API framework to record the log.You can obtain the logger object through the logger.getLogger () method. This method accepts a parameter to represent the name of the log recorder. Generally, the name of the current class is used. Example code: import java.util.logging.Logger; public class MyClass { private static final Logger logger = Logger.getLogger(MyClass.class.getName()); // ... } 3. Record log: Once the Logger object is initialized, you can use the logger object to record the log.The Logging API framework provides different levels of logging methods, including debugging information, error information, warning information, etc.Select the right level as needed.Common log record methods include: logger.debug (), logger.info (), loger.warn (), loger.error (), etc. Example code: public class MyClass { private static final Logger logger = Logger.getLogger(MyClass.class.getName()); public void doSomething() { logger.info ("Starting the Dosomething method"); // Execute code logger.info ("Dosomething method is executed"); } } 4. Configuration log output: In the logging API framework, you can control the output level, output format and output position of the logging file or program code.The specific configuration method depends on the framework used.In the configuration file, you can set the log output level as Debug, Info, Warn, ERROR, etc., and specify the output to the console or file. Example configuration file (log4j.properties): properties # Set the log output level as Debug log4j.rootLogger=DEBUG, stdout # Console output log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target=System.out log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %5p %c{1}:%L - %m%n Summarize: Use the Logging API framework for debugging can help developers more conveniently obtain information during program runtime and quickly locate the problem.Through reasonable recording and output logs, the maintenance and debugging efficiency of the program can be improved.During the development process, you need to carefully select the appropriate logging API framework, and configure and use it according to project needs.