如何在Log4j2中使用编程配置添加OutputStream？

6yt4nkrj 于 2022-11-06 发布在其他

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你知道如何将我的输出流添加到构建配置中吗？

ConfigurationBuilder<BuiltConfiguration> builder = 
ConfigurationBuilderFactory.newConfigurationBuilder();

AppenderComponentBuilder osAppender = builder.newAppender("os", "OutputStream");
osAppender.addAttribute("target", myStream);
builder.add(osAppender);

BuiltConfiguration config = builder.build();
Configurator.initialize(config);

这是我收到的错误消息：

2022-01-27 15:04:41,203 main ERROR OutputStream contains an invalid element or attribute "target"
2022-01-27 15:04:41,227 main ERROR Could not create plugin of type class org.apache.logging.log4j.core.appender.OutputStreamAppender for element OutputStream: java.lang.NullPointerException java.lang.NullPointerException
at org.apache.logging.log4j.core.appender.OutputStreamAppender.getManager(OutputStreamAppender.java:159)

谢谢

Log4j

来源：https://stackoverflow.com/questions/70879986/how-can-i-add-the-outputstream-using-programmatical-configuration-in-log4j2

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按热度按时间

nwlls2ji1#

ConfigurationBuilder API不允许你设置不能序列化到String的属性。因此你需要直接使用OutputSreamAppender的构建器：

final LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
  final Configuration config = ctx.getConfiguration();
  final Appender appender = OutputStreamAppender.newBuilder()//
                                                .setTarget(myStream)
                                                .setConfiguration(ctx.getConfiguration())
                                                .build();
  config.addLoggerAppender(ctx.getRootLogger(), appender);

有关ConfigurationBuilder API与Log4j组件的直接示例化的另一个示例，请参见this question。
另请查看Log4j's architecture，它解释了所有这些组件如何协同工作。

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如何在Log4j2中使用编程配置添加OutputStream？

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