通过属性文件为log4j2中的特定记录器配置复合过滤器

Question

Log4j2 提供了各种类型的过滤器 [1]，这些过滤器可以在四个级别进行配置：

1. 上下文范围的
2. Logger
3. Appender
4. Appender 参考

在我的用例中，我想在 设置一个 CompositeFilter使用属性文件语法指定 Logger（上面的级别 2）。

为了举例说明，我们假设我们要设置一个由两个匹配 .*SQL.* 和 .*JPQL.*< 的 RegexFilter 组成的复合过滤器。 /code> 分别。假设我们有以下事件：

logger.info("Messase with no keyword");
logger.info("Messase with SQL keyword");
logger.info("Messase with JPQL keyword");
logger.info("Messase with both SQL and JPQL keywords");

只有最后一个事件应该从复合过滤器传递。

我进行了多次尝试 [2]（也在下面概述）来获得所需的输出，但我无法弄清楚如何使用属性语法正确设置 CompositeFilter，因此我们将不胜感激。

尝试 0

logger.t1.filter.f1.type = RegexFilter
logger.t1.filter.f1.regex = .*SQL.*
logger.t1.filter.f1.onMatch = NEUTRAL
logger.t1.filter.f1.onMismatch = DENY
logger.t1.filter.f2.type = RegexFilter
logger.t1.filter.f2.regex = .*JPQL.*
logger.t1.filter.f2.onMatch = ACCEPT
logger.t1.filter.f2.onMismatch = DENY
logger.t1.appenderRefs = a
logger.t1.appenderRef.a.ref = L0

尝试 1

logger.t1.filters = f1, f2
logger.t1.filter.f1.type = RegexFilter
logger.t1.filter.f1.regex = .*SQL.*
logger.t1.filter.f1.onMatch = NEUTRAL
logger.t1.filter.f1.onMismatch = DENY
logger.t1.filter.f2.type = RegexFilter
logger.t1.filter.f2.regex = .*JPQL.*
logger.t1.filter.f2.onMatch = ACCEPT
logger.t1.filter.f2.onMismatch = DENY

尝试 2

logger.t1.filters.f1.type = RegexFilter
logger.t1.filters.f1.regex = .*SQL.*
logger.t1.filters.f1.onMatch = NEUTRAL
logger.t1.filters.f1.onMismatch = DENY
logger.t1.filters.f2.type = RegexFilter
logger.t1.filters.f2.regex = .*JPQL.*
logger.t1.filters.f2.onMatch = ACCEPT
logger.t1.filters.f2.onMismatch = DENY
logger.t1.appenderRefs = a
logger.t1.appenderRef.a.ref = L0

尝试 3

logger.t1.filter.M.type = Filters
logger.t1.filter.M.f1.type = RegexFilter
logger.t1.filter.M.f1.regex = .*SQL.*
logger.t1.filter.M.f1.onMatch = NEUTRAL
logger.t1.filter.M.f1.onMismatch = DENY
logger.t1.filter.M.f2.type = RegexFilter
logger.t1.filter.M.f2.regex = .*JPQL.*
logger.t1.filter.M.f2.onMatch = ACCEPT
logger.t1.filter.M.f2.onMismatch = DENY
logger.t1.appenderRefs = a
logger.t1.appenderRef.a.ref = L0

一些进一步的说明：

• 我对设置 CompositeFilter，不是 编写一个自定义过滤器，而不是使用单个组合的 RegexFilter 等。
• 我有兴趣了解它是如何使用属性语法完成的，而不是 XML、JSON 或其他。

[1] https://logging.apache.org/log4j/2 .x/manual/filters.html

[2] https://github.com/zabetak/logging-log4j2/commit/a9944885100db42f7e3ba1b3ff81d59b743d0ab7

Answer 1

There are two problems with your configuration:

1. A LoggerConfig accepts only a single filter. If you want to use multiple filters, configure a CompositeFilter explicitly (which has a plugin name "Filters),
2. The order of filters in a properties configuration file is basically random, since Properties is a Hashtable and does not have a predefined order.

Considering the two facts above a variation of your attempt 3 should work:

logger.t1.filter.M.type = Filters
logger.t1.filter.M.f1.type = RegexFilter
logger.t1.filter.M.f1.regex = .*SQL.*
logger.t1.filter.M.f1.onMatch = NEUTRAL
logger.t1.filter.M.f1.onMismatch = DENY
logger.t1.filter.M.f2.type = RegexFilter
logger.t1.filter.M.f2.regex = .*JPQL.*
logger.t1.filter.M.f2.onMatch = NEUTRAL
logger.t1.filter.M.f2.onMismatch = DENY

Both filters return NEUTRAL, when the pattern matches,保证过滤器顺序的反转不会打破逻辑。