从日志应用者类访问Spring Bean

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问题描述

我有log4j dailyrolllingfileappender类，其中setfile()方法我需要检查数据库值以决定要使用哪个文件进行登录.

DailyRollingFileAppender class 

public void setFileName()
{
    isLoginEnabled = authenticationManager.checkLoginLogging();
}

此处'AuthenticationManager'是用于使用Spring依赖注入功能进行数据库调用的类的对象.

spring-beans.xml
<bean id="dailyRollingFileAppender" class="com.common.util.DailyRollingFileAppender">
 <property name="authenticationManager">
     <ref bean="authenticationManager"/>
 </property>
</bean>

<bean id="authenticationManager" class="com.security.impl.AuthenticationManagerImpl">
    <property name="userService">
        <ref bean="userService"/>
</property>
</bean>

现在，当我启动应用程序log4j时，首先启动log4j，并且由于弹簧beans尚未调用，它会将NullPoInterException扔到方法setFilename()中. 因此，有什么方法可以打电话给'AuthenticationManager.CheckLoginLogging();'从每日fileappender类中，以便当log4j加载时应该能够获得数据库值?

推荐答案

迟到几年，但我希望这对某人有帮助.

我也采用了类似的功能 - 我有一个自定义的应用程序，我想使用自动bean使用我们构建的服务执行一些记录.通过使Appender实现ApplicationContextaware接口，并制作我通常会静态的字段，我可以将弹簧控制的BEAN注入Log4J实例化的Appender实例.

@Component
public class SslErrorSecurityAppender extends AppenderSkeleton implements ApplicationContextAware {

    private static SecurityLogger securityLogger;

    @Override
    protected void append(LoggingEvent event) {
        securityLogger.log(new SslExceptionSecurityEvent(SecurityEventType.AUTHENTICATION_FAILED, event.getThrowableInformation().getThrowable(), "Unexpected SSL error"));
    }

    @Override
    public boolean requiresLayout() {
        return false;
    }

    @Override
    public synchronized void close() {
        this.closed = true;
    }


    @Override
    public void setApplicationContext(ApplicationContext applicationContext) {
        if (applicationContext.getAutowireCapableBeanFactory().getBean("securityLogger") != null) {
            securityLogger = (SecurityLogger) applicationContext.getAutowireCapableBeanFactory().getBean("securityLogger");
        }
    }
}

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问题描述

I have log4j DailyRollingFileAppender class in which setFile() method I need to check database value to decide which file to used for logging.

DailyRollingFileAppender class 

public void setFileName()
{
    isLoginEnabled = authenticationManager.checkLoginLogging();
}

Here 'authenticationManager' is object of class used to make database call using spring dependency injection feature.

spring-beans.xml
<bean id="dailyRollingFileAppender" class="com.common.util.DailyRollingFileAppender">
 <property name="authenticationManager">
     <ref bean="authenticationManager"/>
 </property>
</bean>

<bean id="authenticationManager" class="com.security.impl.AuthenticationManagerImpl">
    <property name="userService">
        <ref bean="userService"/>
</property>
</bean>

Now when I start my application log4j gets initiated first and since spring-beans is yet to invoked it throws NullPointerException in method setFileName(). So is there a way I can make call to 'authenticationManager.checkLoginLogging();' from DailyFileAppender class so that when log4j loads it should able to get database value?

推荐答案

A few years late, but I hope this is of help to someone.

I was after similar functionality - I have a custom appender, and i wanted to use an autowired bean to perform some logging using a service we'd built. By making the appender implement the ApplicationContextAware interface, and making the field that i'd normally autowire static, i'm able to inject the spring-controlled bean into the instance of the appender that log4j has instantiated.

@Component
public class SslErrorSecurityAppender extends AppenderSkeleton implements ApplicationContextAware {

    private static SecurityLogger securityLogger;

    @Override
    protected void append(LoggingEvent event) {
        securityLogger.log(new SslExceptionSecurityEvent(SecurityEventType.AUTHENTICATION_FAILED, event.getThrowableInformation().getThrowable(), "Unexpected SSL error"));
    }

    @Override
    public boolean requiresLayout() {
        return false;
    }

    @Override
    public synchronized void close() {
        this.closed = true;
    }


    @Override
    public void setApplicationContext(ApplicationContext applicationContext) {
        if (applicationContext.getAutowireCapableBeanFactory().getBean("securityLogger") != null) {
            securityLogger = (SecurityLogger) applicationContext.getAutowireCapableBeanFactory().getBean("securityLogger");
        }
    }
}

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