logback自定义格式转换器

package chapters.layouts; 
 
import ch.qos.logback.classic.Level; 
import ch.qos.logback.classic.pattern.ClassicConverter; 
import ch.qos.logback.classic.spi.ILoggingEvent; 
 
public class MySampleConverter extends ClassicConverter { 
 
  private static final String END_COLOR = "\u001b[m"; 
 
  private static final String ERROR_COLOR = "\u001b[0;31m"; 
  private static final String WARN_COLOR = "\u001b[0;33m"; 
 
  @Override 
  public String convert(ILoggingEvent event) { 
    StringBuffer sbuf = new StringBuffer(); 
    sbuf.append(getColor(event.getLevel())); 
    sbuf.append(event.getLevel()); 
    sbuf.append(END_COLOR); 
    return sbuf.toString(); 
  }

  /** 
   * Returns the appropriate characters to change the color for the 
specified 
   * logging level. 
   */ 
  private String getColor(Level level) { 
    switch (level.toInt()) { 
    case Level.ERROR_INT: 
      return ERROR_COLOR; 
    case Level.WARN_INT: 
      return WARN_COLOR; 
    default: 
      return ""; 
    } 
  } 
} 

<configuration> 
 <conversionRule conversionWord="sample"  converterClass="chapters.layouts.MySampleConverter" /> 
 <appender name="STDOUT" 
class="ch.qos.logback.core.ConsoleAppender"> 
    <encoder> 
      <pattern>%-4relative [%thread] %sample - %msg%n</pattern> 
    </encoder> 
  </appender> 
 
  <root level="DEBUG"> 
    <appender-ref ref="STDOUT" /> 
  </root> 

</configuration> 

java  chapters.layouts.SampleLogging src/main/java/chapters/layouts/mySampleConverterConfig.xml 

0        [main] DEBUG - Everything‘s going  well 
3        [main] ERROR - maybe not quite... 

 <conversionRule conversionWord="sample" converterClass="chapters.layouts.MySampleConverter" /> 

package ch.qos.logback.classic;

import java.util.HashMap;
import ...........;
/**
 * <p>
 * A flexible layout configurable with pattern string. The goal of this class is
 * to {@link #format format} a {@link ILoggingEvent} and return the results in a
 * {#link String}. The format of the result depends on the
 * <em>conversion pattern</em>.
 * <p>
 * For more information about this layout, please refer to the online manual at
 * http://logback.qos.ch/manual/layouts.html#PatternLayout
 * 
 */

public class PatternLayout extends PatternLayoutBase<ILoggingEvent> {

  public static final Map<String, String> defaultConverterMap = new HashMap<String, String>();
  public static final String HEADER_PREFIX = "#logback.classic pattern: ";
  
  static {
    defaultConverterMap.putAll(Parser.DEFAULT_COMPOSITE_CONVERTER_MAP);

    defaultConverterMap.put("d", DateConverter.class.getName());
    defaultConverterMap.put("date", DateConverter.class.getName());

    defaultConverterMap.put("r", RelativeTimeConverter.class.getName());
    defaultConverterMap.put("relative", RelativeTimeConverter.class.getName());

    defaultConverterMap.put("level", LevelConverter.class.getName());
    defaultConverterMap.put("le", LevelConverter.class.getName());
    defaultConverterMap.put("p", LevelConverter.class.getName());

   ....

  }... 
}

defaultConverterMap.put("highlight", HighlightingCompositeConverter.class.getName());