Use NLOG4J framework to perform performance tuning and log analysis in the Java library

Use NLOG4J framework to perform performance tuning and log analysis in the Java library preface: During the development of Java, the demand for performance tuning and log analysis is very common.Performance tuning can help us find the bottleneck in the code and improve the efficiency and response speed of the program.Log analysis is the key tool for our positioning and solving problems, which can help us understand the operation and abnormal situation of the program.The NLOG4J framework is a powerful Java log management tool, which can also be used for performance tuning. This article will introduce in detail how to use the NLOG4J framework for the performance tuning and log analysis of the Java class library, and provide the corresponding Java code example. Part 1: Performance Title Performance tuning refers to the process of optimizing code to improve the operating efficiency and resource utilization rate.The steps will be introduced below to use NLOG4J in the Java library for performance tuning: 1. Import the nlog4j library First, you need to import the nlog4j library in the project.You can add the following dependencies to the Maven configuration file of the project: <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-core</artifactId> <version>2.14.1</version> </dependency> 2. Configuration log level Add the following in the configuration file: <?xml version="1.0" encoding="UTF-8"?> <Configuration> <Appenders> <Console name="Console" target="SYSTEM_OUT"> <PatternLayout pattern="%-5level %logger{36} - %msg%n"/> </Console> </Appenders> <Loggers> <Root level="info"> <AppenderRef ref="Console"/> </Root> </Loggers> </Configuration> Among them, `<root level =" info ">` `to set the log level to INFO, which means that only the log information of the INFO and the above level will be recorded. 3. Add performance tuning code Before and after the code segment that requires performance tuning, add the code of performance tuning.You can use the nlog4j framework `organpache.logging.log4j.logmanager` and` org.apache.logging.log4j.logger`. import org.apache.logging.log4j.LogManager; import org.apache.logging.log4j.Logger; public class MyClass { private static final Logger logger = LogManager.getLogger(MyClass.class); public void myMethod() { logger.info ("Starting the MyMethod Method"); // Code for performance tuning logger.info ("The Mymethod method is executed"); } } In the above examples, we added log information at the beginning and end of the `MyMethod` method to start and end the monitoring method execution.For performance tuning, you can choose to add appropriate log information as needed. Part 2: Log Analysis Log analysis refers to the analysis of log information to find problems, abnormal conditions, and performance bottlenecks in program operation.The following will introduce how to use nlog4j for log analysis: 1. Add log output In the code, we can use different logs to output different types of log information.Where you need output, use `logger.debug (),` logger.info () `,` logger.warn (), `logger.error ()` method to output the corresponding level of log information. public class MyClass { private static final Logger logger = LogManager.getLogger(MyClass.class); public void myMethod() { logger.info ("Starting the MyMethod Method"); // code logic Logger.error ("" Out abnormality "); } } In the above examples, we output Info -level and ERROR -level log information at the beginning of the method and the occurrence of abnormalities.In this way, when the production environment is running, you can choose which level of log information. 2. Configure log format We can configure the log format to output log output as the format we need.In the configuration file, we can use the `Patternlayout` tag to define different log formats.For example, we can output log output into a combination of time, log level, class name and message. <?xml version="1.0" encoding="UTF-8"?> <Configuration> <Appenders> <Console name="Console" target="SYSTEM_OUT"> <PatternLayout pattern="%d %-5level [%t] %logger{36} - %msg%n"/> </Console> </Appenders> <Loggers> <Root level="info"> <AppenderRef ref="Console"/> </Root> </Loggers> </Configuration> The above example defines the log format as the ` %d %-5level [ %t] %logger {36} - %msg %n`, where: -`%d` indicates the output time -`%-5Level` indicates the output log level, shows up to 5 characters at most -` [%t] `indicates the name of the output thread -`%logger {36}` indicates the output class name, shows up to 36 characters -`%msg%n` indicates the output log message and changing symbols 3. Log file preservation In the development environment or production environment, we can save log information in the file to facilitate subsequent analysis and viewing.Add FileAppender to the configuration file and specify the file path of saving log information. <?xml version="1.0" encoding="UTF-8"?> <Configuration> <Appenders> <Console name="Console" target="SYSTEM_OUT"> <PatternLayout pattern="%d %-5level [%t] %logger{36} - %msg%n"/> </Console> <File name="File" fileName="logs/mylog.log"> <PatternLayout pattern="%d %-5level [%t] %logger{36} - %msg%n"/> </File> </Appenders> <Loggers> <Root level="info"> <AppenderRef ref="Console"/> <AppenderRef ref="File"/> </Root> </Loggers> </Configuration> The above example is equipped with a FileAppender called `File`, and the log information will be stored in the` logs/mylog.log` file.You can change the file name and path as needed. Summarize: This article introduces how to use the NLOG4J framework for the performance tuning and log analysis of the Java class library.In terms of performance tuning, the log information of the NLOG4J framework recording method can be used to monitor the execution of the program.In terms of log analysis, you can configure different levels of log information and output it as the format we need for subsequent analysis and viewing.The NLOG4J framework provides rich functions and configuration options that can meet our performance tuning and log analysis needs in Java development.