Log4j2、Log4j、Logback自定义Appender实现_appenderskeleton log4j2-优快云博客

本文介绍了如何自定义日志Appender，分别针对Log4j2、Log4j和Logback进行详细讲解。以Gwarn为例，展示了在logback中配置异常收集Appender的代码，以及Log4j和Log4j2对应的配置方法。

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1、Log4j2自定义Appender

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.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;

import java.io.Serializable;

/**
 * 自定义实现log4j2的输出源
 */
@Plugin(name = "Gwarn", category = "Core", elementType = "appender", printObject = true)
public final class GwarnLog4j2Appender extends AbstractAppender {
   /**
    * 
    */
   private static final long serialVersionUID = -3650550892005283720L;

   private static final byte[] lock = new byte[1];

   protected GwarnLog4j2Appender(String name, Filter filter, Layout<? extends Serializable> layout, 
          final boolean ignoreExceptions) {
      super(name, filter, layout, ignoreExceptions);
   }


   @Override
   public void append(LogEvent event) {
      if (event != null && event.getMessage() != null) {
            // 此处自定义实现输出
      }
   }

   @PluginFactory
   public static GwarnLog4j2Appender createAppender(@PluginAttribute("name") String name,
         @PluginElement("Layout") Layout<? extends Serializable> layout,
         @PluginElement("Filter") final Filter filter, @PluginAttribute("sysCode") String sysCode,
         @PluginAttribute("period") String period) {
      if (name == null) {
         LOGGER.error("No name provided for MyCustomAppenderImpl");
         return null;
      }
      if (layout == null) {
         layout = PatternLayout.createDefaultLayout();
      }
      return new GwarnLog4j2Appender(name, filter, layout, true);
   }

}

2、Log4j自定义Appender

import org.apache.log4j.AppenderSkeleton;
import org.apache.log4j.spi.LoggingEvent;

/**
 * 自定义实现log4j的输出源<br/>
 * 
 * 调用Log4j输出日志时，调用各个组件的顺序: <br/>
 * 1、日志信息传入 Logger。<br/>
 * 2、将日志信息封装成 LoggingEvent 对象并传入 Appender。 <br/>
 * 3、在 Appender 中调用 Filter 对日志信息进行过滤，调用 Layout 对日志信息进行格式化，然后输出
 */
public class GwarnLog4jAppender extends AppenderSkeleton {


   private static final byte[] lock = new byte[1];

   @Override
   public void close() {
   }

   // 是否需要按格式输出文本
   @Override
   public boolean requiresLayout() {
      return false;
   }

   @Override
   protected void append(LoggingEvent event) {
      if (event != null && event.getMessage() != null) {
         // 自定义实现
      }
   }
}

3、Logback自定义Appender

import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.AppenderBase;

/**
 * 自定义实现logback的输出源
 */
public class GwarnLogbackAppender extends AppenderBase<ILoggingEvent> {


   private static final byte[] lock = new byte[1];

   @Override
   protected void append(ILoggingEvent eventObject) 
      if (eventObject != null && eventObject.getMessage() != null) {
          // 自定义实现
      }
   }

}