Log4j 2不再支持log4j.properties文件了吗？ [英] Log4j 2 doesn't support log4j.properties file anymore?

问题描述

我正在使用log4j 2.0-rc1和 log4j.properties 文件运行一个示例，但log4j lib始终使用默认配置（日志级别，appender等）运行它。我也尝试将名称更改为 log4j2.properties ，但没有任何反应。

I am running an example using log4j 2.0-rc1 and log4j.properties file, but log4j lib always runs it with the default configuration (log level, appender, etc). I also tried changing the name to log4j2.properties and nothing happened.

推荐答案

Log4j 2不再支持Log4j v1.properties格式（但是，从v2.4开始，Log4j支持Property格式，但其语法是与v1格式完全不同）。新格式是XML，JSON和YAML，请参阅文档 （注意：如果您在名为.properties的文件中使用其中一种格式，则可能会造成混淆）。

Log4j 2 doesn't support the Log4j v1 ".properties" format anymore (yet, since v2.4, Log4j supports a Property format, but its syntax is totally different from v1 format). New formats are XML, JSON, and YAML, see the documentation (note: if you used one of these formats in a file called ".properties", it may be confusing).

要指定配置文件的位置，是否使用系统属性 log4j.configurationFile ，Log4j类 ConfigurationFactory ，还是其他什么？
您是否阅读过本手册页？它解释了：
尽管Log4j 2的配置语法与Log4j 1.x的语法不同，但大多数（如果不是全部）相同的功能都可用。

To specify the location of your configuration file, do you use the system property log4j.configurationFile, the Log4j class ConfigurationFactory, or something else? Did you read this manual page? It explains that: Although the Log4j 2 configuration syntax is different than that of Log4j 1.x, most, if not all, of the same functionality is available.

因此，似乎不支持传统的Log4j1.x log4j.properties 文件，必须将其迁移到v2.x格式。迁移似乎很容易，看看我上面给出的链接中的示例。以下是摘录：

So it seems that a legacy Log4j1.x log4j.propertiesfile is not supported as is, it must be migrated to v2.x format. The migration seems quite easy though, looking at the example in the link I gave above. Here is an extract:

Log4j v1.x配置文件示例：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration PUBLIC "-//APACHE//DTD LOG4J 1.2//EN" "log4j.dtd">
<log4j:configuration xmlns:log4j='http://jakarta.apache.org/log4j/'>
    <appender name="STDOUT" class="org.apache.log4j.ConsoleAppender">
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%d %-5p [%t] %C{2} (%F:%L) - %m%n"/>
        </layout>
    </appender>
    <category name="org.apache.log4j.xml">
        <priority value="info" />
    </category>
    <Root>
        <priority value ="debug" />
        <appender-ref ref="STDOUT" />
    </Root>
</log4j:configuration>

将相同的配置文件迁移到Log4j v2：

<?xml version="1.0" encoding="UTF-8"?>
<Configuration>
    <Appenders>
        <Console name="STDOUT" target="SYSTEM_OUT">
            <PatternLayout pattern="%d %-5p [%t] %C{2} (%F:%L) - %m%n"/>
        </Console>
    </Appenders>
    <Loggers>
    <Logger name="org.apache.log4j.xml" level="info"/>
        <Root level="debug">
            <AppenderRef ref="STDOUT"/>
        </Root>
    </Loggers>
</Configuration>

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