这篇文章主要介绍了log4j2动态修改日志级别及拓展性使用详解，小编觉得挺不错的，现在分享给大家，也给大家做个参考。一起跟随小编过来看看吧
一、供参考的完整日志配置
${sys:vmparam} ${basePath}/app.log
二、动态修改日志级别
Collectioncurrent = LoggerContext.getContext(false).getLoggers(); Collection notcurrent = LoggerContext.getContext().getLoggers(); Collection allConfig = current; allConfig.addAll(notcurrent); for (org.apache.logging.log4j.core.Logger log:allConfig){ log.setLevel(Level.DEBUG); }
三、自定义appender
以上介绍，均依赖于log4j2提供的官方配置，当对日志的业务逻辑复杂时，光靠配置也许满足不了需要，此时我们会想自己能操控打印的日志，做日志的路由，或保存等操作，这个时候就需要有自定义的appender，可以配置的就靠配置完成，不能的就自己写代码干预，而log4j2刚好提供了这样的拓展性。
如下代码即是自定义的Appender，通过实现AbstractAppender接口，配置@Plugin注解对应的信息并在eppend方法中写自己的业务逻辑，从而实现了对日志更大自由度的控制，如下展示的log4j配置文件中的配置节点名称要和注解中配置的name属性一致，并在Configuration节点配置好自定义Appender所在的包路径即可。
package com.jyk.log4j2.log4j2_test; import java.io.Serializable; import java.util.concurrent.locks.Lock; import java.util.concurrent.locks.ReadWriteLock; import java.util.concurrent.locks.ReentrantReadWriteLock; import org.apache.logging.log4j.core.Filter; import org.apache.logging.log4j.core.Layout; import org.apache.logging.log4j.core.LogEvent; import org.apache.logging.log4j.core.appender.AbstractAppender; import org.apache.logging.log4j.core.appender.AppenderLoggingException; import org.apache.logging.log4j.core.config.plugins.Plugin; import org.apache.logging.log4j.core.config.plugins.PluginAttribute; import org.apache.logging.log4j.core.config.plugins.PluginElement; import org.apache.logging.log4j.core.config.plugins.PluginFactory; import org.apache.logging.log4j.core.layout.PatternLayout; @Plugin(name = "MyAppender", category = "Core", elementType = "appender", printObject = true) public class MyAppender extends AbstractAppender { /** * @fields serialVersionUID */ private static final long serialVersionUID = -830237775522429777L; private final ReadWriteLock rwLock = new ReentrantReadWriteLock(); private final Lock readLock = rwLock.readLock(); //需要实现的构造方法，直接使用父类就行 protected MyAppender(final String name, final Filter filter, final Layout layout, final boolean ignoreExceptions) { super(name, filter, layout, ignoreExceptions); } @Override public void append(LogEvent event) { readLock.lock(); try { final byte[] bytes = getLayout().toByteArray(event);//日志二进制文件，输出到指定位置就行 //拿到每次打印的日志，写自己的业务逻辑 System.out.println("enter my append..."); } catch (Exception ex) { if (!ignoreExceptions()) { throw new AppenderLoggingException(ex); } } finally { readLock.unlock(); } } // 下面这个方法可以接收配置文件中的参数信息 @PluginFactory public static MyAppender createAppender(@PluginAttribute("name") String name, @PluginElement("Filter") final Filter filter, @PluginElement("Layout") Layout layout, @PluginAttribute("ignoreExceptions") boolean ignoreExceptions) { if (name == null) { LOGGER.error("No name provided for MyCustomAppenderImpl"); return null; } if (layout == null) { layout = PatternLayout.createDefaultLayout(); } return new MyAppender(name, filter, layout, ignoreExceptions); } }以上就是log4j2动态修改日志级别及拓展性使用详解的详细内容，更多请关注0133技术站其它相关文章！
