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我正在尝试为每个日志添加用户名。我发现 MDC 是合适的解决方案,我遵循了该教程

这是一个日志片段,用于测试目的;我打印单词“TEST”而不是用户名:

2013-09-30 11:24:03,087 INFO  company.filter.AuthenticationFilter - TEST - AuthenticationFilter is called
2013-09-30 11:24:03,089 INFO  company.filter.AuthenticationFilter - TEST - userName is removed
2013-09-30 11:24:03,089 INFO  company.filter.AuthenticationFilter - TEST - AuthenticationFilter is called
2013-09-30 11:24:03,089 INFO  company.filter.AuthenticationFilter - TEST - userName is removed
2013-09-30 11:24:03,093 INFO  company.interceptors.AuthentificationInterceptor -  - Interceptor, actionName : Company_getTab redirect to Login_timeOut : false
2013-09-30 11:24:03,094 INFO  company.interceptors.AuthentificationInterceptor -  - Interceptor, actionName : Company_getTop redirect to Login_timeOut : false
2013-09-30 11:24:03,095 INFO  company.interceptors.AuthentificationInterceptor -  - Interceptor, actionName : Company_getBottom redirect to Login_timeOut : false
2013-09-30 11:24:03,124 INFO  company.actions.CompanyAction -  - sample log

如您所见,它似乎只在Struts2 拦截器或操作中有效AuthenticationFilter,但在 Struts2 拦截器或操作中无效。我是AuthenticationFilter这样实现的:

public class AuthenticationFilter implements Filter {
  private final Logger logger = Logger.getLogger(AuthenticationFilter.class);

  @Override
  public void doFilter(ServletRequest request, ServletResponse response,
        FilterChain chain) throws IOException, ServletException {

    try {
        MDC.put("userName", "TEST");
        logger.info("AuthenticationFilter is called");
        chain.doFilter(request, response);
    } finally {
        logger.info("userName is removed.");
        MDC.remove("userName");
    }
  }

  @Override
  public void destroy() {}

  @Override
  public void init(FilterConfig arg0) throws ServletException {}
}

我将此添加到文件中web.xml

    <filter>
        <filter-name>AuthFilter</filter-name>
        <filter-class>company.filter.AuthenticationFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>AuthFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

这就是我使用的模式log4j.xml

<layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%d %-5p %c - %X{userName} - %m%n"/>
</layout>

我想我对 MDC 有一些不明白的地方。我认为将为每个请求调用 MDC,以便它可以设置映射,ThreadLocal并且每个请求都有它自己的线程(我可能也无法ThreadLocal正确理解。)。

我应该查找/修改什么以便在我的配置中使用 MDC?

编辑:

我添加了一个日志,这样我就可以看到地图中的数据何时被删除。在第一个动作/拦截器日志之前,它们在地图中什么都没有。我希望看到这样的东西:

  • AuthenticationFilter - 测试 -
  • 拦截器日志
  • AuthenticationFilter 用户名已删除
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