AOP 日志记录：@Aspect 未在控制台中记录 log4j 默认配置的错误

Question

我是 Spring 的新手，正在尝试使用 log4j 实现 Spring AOP 以在控制台中记录错误。请注意，我的项目中没有 log4j.xml，但这应该没问题，因为我只想使用 Spring AOP 概念在控制台中记录错误。

下面是我的代码，当我运行这个时，我可以在控制台中看到异常堆栈跟踪，但我没有看到我的 LoggingAspect.java 正在控制台中记录错误应该是。

我尝试在 LoggingAspect.java 中添加静态块以使用 System.out.println() 在控制台中打印一些文本，但它没有打印出来。

SpringConfig.java

package exercise5.com.aadi.configuration;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.EnableAspectJAutoProxy;

@Configuration
@EnableAspectJAutoProxy
@ComponentScan(basePackages = "exercise5.com.aadi.service")
public class SpringConfig {
}

LoggingAspect.java

package exercise5.com.aadi.utility;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.stereotype.Component;


@Aspect
@Component
public class LoggingAspect {

    @AfterThrowing(pointcut = "execution(* exercise5.com.aadi.service.*Impl.*(..))", throwing = "exception")
    public void logExceptionFromService(Exception exception) throws Exception {
        Logger logger = LogManager.getLogger(this.getClass());
        logger.error(exception);
    }
}

我的异常来自 DAO

InsuranceServiceImpl.java

package exercise5.com.aadi.service;

...
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

...

@Service(value = "insuranceService")
public class InsuranceServiceImpl implements InsuranceService {

    ...

    @Override
    public List<PolicyReport> getReport(String policyType) throws Exception {
        ...

        if (filteredPolicy.isEmpty())
            throw new Exception("Service.NO_RECORD");

        ...

    }

    ...
}

下面是我收到的控制台消息

ERROR StatusLogger No Log4j 2 configuration file found. Using default configuration (logging only errors to the console), or user programmatically provided configurations. Set system property 'log4j2.debug' to show Log4j 2 internal initialization logging. See https://logging.apache.org/log4j/2.x/manual/configuration.html for instructions on how to configure Log4j 2
Exception in thread "main" java.lang.Exception: Service.NO_RECORD
    at exercise5.com.aadi.service.InsuranceServiceImpl.getReport(InsuranceServiceImpl.java:43)
    at exercise5.com.aadi.ui.UserInterface.generateReport(UserInterface.java:45)
    at exercise5.com.aadi.ui.UserInterface.main(UserInterface.java:20)

但我期待的是

ERROR StatusLogger No Log4j 2 configuration file found. Using default configuration (logging only errors to the console), or user programmatically provided configurations. Set system property 'log4j2.debug' to show Log4j 2 internal initialization logging. See https://logging.apache.org/log4j/2.x/manual/configuration.html for instructions on how to configure Log4j 2
Exception in thread "main" 02:03:52.656 [main] ERROR exercise5.com.aadi.service.InsuranceServiceImpl
java.lang.Exception: Service.NO_RECORD
    at exercise5.com.aadi.service.InsuranceServiceImpl.getReport(InsuranceServiceImpl.java:56) [bin/:?]
    at exercise5.com.aadi.ui.UserInterface.generateReport(UserInterface.java:45) [bin/:?]
    at exercise5.com.aadi.ui.UserInterface.main(UserInterface.java:20) [bin/:?]
java.lang.Exception: Service.NO_RECORD
    at exercise5.com.aadi.service.InsuranceServiceImpl.getReport(InsuranceServiceImpl.java:56)
    at exercise5.com.aadi.ui.UserInterface.generateReport(UserInterface.java:45)
    at exercise5.com.aadi.ui.UserInterface.main(UserInterface.java:20)

请注意，异常日志应该存在两次。第一个来自 Spring AOP LoggingAspect.java，第二个是正常的异常堆栈跟踪。

任何人都可以帮助我，为什么我没有得到第一个？

Answer 1

您正在指定

@ComponentScan(basePackages = "exercise5.com.aadi.service")

这意味着您的 LoggingAspect @Component 不会被 Spring 接收，因为它位于

之下

exercise5.com.aadi.utility

除此之外，您的 AOP 配置似乎是正确的。

AOP 日志记录：@Aspect 未在控制台中记录 log4j 默认配置的错误

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