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主页 / 问题 / 1605585
Accepted
Андрей Рацкевич
Андрей Рацкевич
Asked:2025-01-26 03:25:27 +0000 UTC2025-01-26 03:25:27 +0000 UTC 2025-01-26 03:25:27 +0000 UTC

编译 log4j.xml 文件时出现 Log4J 日志记录错误

  • 772

作为培训任务的一部分,我编写了一个文件 Log4j2.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration status="WARN">
    <appenders>
        <File name="ExceptionsFile" fileName="logs/errors.log">
            <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
            <Filters>
                <ThresholdFilter level="error" onMatch="ACCEPT" onMismatch="DENY"/>
            </Filters>
        </File>
        <File name="QueriesFile" fileName="logs/queries.log">
            <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
            <Filters>
                <ThresholdFilter level="info" onMatch="ACCEPT" onMismatch="DENY"/>
            </Filters>
        </File>
    </appenders>
    <loggers>
        <logger name="Main" level="info" additivity="false">
            <appender-ref ref="QueriesFile"/>
        </logger>
        <logger name="Main" level="error" additivity="false">
            <appender-ref ref="ExceptionsFile"/>
        </logger>
        <root level="warn">
            <appender-ref ref="ExceptionsFile"/>
        </root>
    </loggers>
</configuration>

在pom.xml中连接库

        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-api</artifactId>
            <version>2.18.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.18.0</version>
        </dependency>

将日志添加到主类

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import java.util.Scanner;
public class Main {
    private static final Logger queryLogger = LogManager.getLogger("Main");
    private static final Logger errorLogger = LogManager.getLogger("Main");
    private static final String ADD_COMMAND = "add Василий Петров " +
            "[email protected] +79215637722";
    private static final String COMMAND_EXAMPLES = "\t" + ADD_COMMAND + "\n" +
            "\tlist\n\tcount\n\tremove Василий Петров";
    private static final String COMMAND_ERROR = "Wrong command! Available command examples: \n" +
            COMMAND_EXAMPLES;
    private static final String helpText = "Command examples:\n" + COMMAND_EXAMPLES;
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        CustomerStorage executor = new CustomerStorage();
        while (true) {
            try {
                String command = scanner.nextLine();
                String[] tokens = command.split("\\s+", 2);
                if (tokens[0].equals("add")) {
                    executor.addCustomer(tokens[1]);
                    queryLogger.info("Added customer: {}", tokens[1]); // Логирование успешного добавления
                } else if (tokens[0].equals("list")) {
                    executor.listCustomers();
                } else if (tokens[0].equals("remove")) {
                    executor.removeCustomer(tokens[1]);
                    queryLogger.info("Removed customer: {}", tokens[1]); // Логирование удаления
                } else if (tokens[0].equals("count")) {
                    System.out.println("There are " + executor.getCount() + " customers");
                } else if (tokens[0].equals("help")) {
                    System.out.println(helpText);
                } else {
                    System.out.println(COMMAND_ERROR);
                    queryLogger.warn("Invalid command entered: {}", command); // Логирование неправильных команд
                }
            } catch (Exception e) { // Ловим общее исключение, лучше заменить на конкретные
                errorLogger.error("Error encountered: ", e); // Логирование ошибок
                System.out.println("Error encountered: " + e.getMessage());
            }
        }
    }
}

代码运行正常,训练验证自动测试通过,在日志文件夹中创建了两个日志文件错误和查询,但没有写入任何内容,它们保持为空。请告诉我为什么消息没有写入日志文件。

java
  • 1 1 个回答
  • 34 Views

1 个回答

  • Voted
  1. Best Answer
    Андрей Рацке
    2025-02-04T03:51:24Z2025-02-04T03:51:24Z
        import org.apache.logging.log4j.LogManager;
    import org.apache.logging.log4j.Logger;
    import java.util.Scanner;
    public class Main {
        private static final Logger logger = LogManager.getLogger("Main");
    
        private static final String ADD_COMMAND = "add Василий Петров " +
                "[email protected] +79215637722";
        private static final String COMMAND_EXAMPLES = "\t" + ADD_COMMAND + "\n" +
                "\tlist\n\tcount\n\tremove Василий Петров";
        private static final String COMMAND_ERROR = "Wrong command! Available command examples: \n" +
                COMMAND_EXAMPLES;
        private static final String helpText = "Command examples:\n" + COMMAND_EXAMPLES;
        public static void main(String[] args) {
            Scanner scanner = new Scanner(System.in);
            CustomerStorage executor = new CustomerStorage();
            while (true) {
                try {
                    String command = scanner.nextLine();
                    String[] tokens = command.split("\\s+", 2);
    
                    if (tokens[0].equals("add")) {
                        executor.addCustomer(tokens[1]);
                        logger.info("Added customer: {}", tokens[1]); // Логирование успешного добавления
                    } else if (tokens[0].equals("list")) {
                        executor.listCustomers();
                    } else if (tokens[0].equals("remove")) {
                        executor.removeCustomer(tokens[1]);
                        logger.info("Removed customer: {}", tokens[1]); // Логирование удаления
                    } else if (tokens[0].equals("count")) {
                        System.out.println("There are " + executor.getCount() + " customers");
                    } else if (tokens[0].equals("help")) {
                        System.out.println(helpText);
                    } else {
                        System.out.println(COMMAND_ERROR);
                        logger.warn("Invalid command entered: {}", command); // Логирование неправильных команд
                    }
                } catch (Exception e) { // Ловим общее исключение, лучше заменить на конкретные
                    logger.error("Error encountered: ", e); // Логирование ошибок
                    System.out.println("Error encountered: " + e.getMessage());
                }
            }
        }
    }
    
    
        <?xml version="1.0" encoding="UTF-8"?>
    
    <configuration>
        <appenders>
            <File name="ErrorFile" fileName="logs/error.log">
                <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
                <Filters>
                    <ThresholdFilter level="error" onMatch="ACCEPT" onMismatch="DENY" />
                </Filters>
            </File>
            <File name="QueryFile" fileName="logs/query.log">
                <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
                <Filters>
    
                    <ThresholdFilter level="error" onMatch="DENY" onMismatch="NEUTRAL" />
                </Filters>
            </File>
        </appenders>
    
        <loggers>
    
            <root level="INFO">
                <appender-ref ref="QueryFile" level="info" />
                <appender-ref ref="ErrorFile" level="error" />
            </root>
    
            <Logger name="QueryFile" level="INFO">
                <AppenderRef ref="QueryFile"/>
            </Logger>
    
            <Logger name="ErrorFile" level="ERROR">
                <AppenderRef ref="ErrorFile"/>
            </Logger>
    
        </loggers>
    </configuration>
    
    • -1

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