Question

我正在将一些Web应用程序从Log4j 1.12迁移到Log4j2。由于公司策略，我们的log4j.xml文件位置在应用程序服务器中配置为URL，应用程序必须使用JNDI获取它们。我们实现了一个ServletContextListener，允许我们以这样的方式初始化log4j基础结构：

public void contextInitialized(ServletContextEvent servletContextEvent) {
    ...
    urlLogConfig = (URL) context.lookup("java:comp/env/"+logLocation);
    ...
    //urlLogConfig -> file:///somepath/log4j.xml
    DOMConfigurator.configureAndWatch(urlLogConfig.getPath());
}
public void contextDestroyed(ServletContextEvent servletContextEvent) {
    ServletContext servletContext = servletContextEvent.getServletContext();
    servletContext.log("Log4jConfigurationListener - Shutting down log4j");
    LogManager.shutdown();
}

但是，随着log4j2 API的更改，无法再使用它。 Log4j2提供了lo4j2-web.jar模块，该模块使用Log4jServletContainerInitializer来初始化库。这最终会调用Log4jWebInitializerImpl.getConfigURI()，负责获取配置文件的URI。

有没有办法自定义Log4jWebInitializerImpl的行为以使其从JNDI名称解析xml文件？

Answer 1

如下：

...
import org.apache.logging.log4j.core.config.Configurator;
...

    private LoggerContext loggerContext;

    public void contextInitialized(ServletContextEvent servletContextEvent) {
       ...
       urlLogConfig = (URL) context.lookup("java:comp/env/"+logLocation);
       ...
       //urlLogConfig -> file:///somepath/log4j.xml
       ServletContext servletContext = servletContextEvent.getServletContext();
       String contextName = servletContext.getServletContextName();
       Classloader classloader = this.getClass().getClassloader();
       loggerContext = Configurator.initialize(contextName, classloader, urlLogConfig.toURI());
    }

    public void contextDestroyed(ServletContextEvent servletContextEvent) {
        ServletContext servletContext = servletContextEvent.getServletContext();
        servletContext.log("Log4jConfigurationListener - Shutting down log4j");
        if (loggerContext != null) 
             Configurator.shutdown(loggerContext);
    }

如何从JNDI加载log4j2配置文件

1 个答案: