Log 之Layout

1.Layout的简介

In case you were wondering, layouts have nothing to do with large estates in Florida. Layouts are logback components responsible for transforming an incoming event into a String. 

2.日志格式怎么读

<encoder>
     <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
</encoder>

• %d表示日志每行的时间格式
• %thread表示线程数，
• %5level 当前日志的级别
• %logger{36} 表示日志框架完整类名显示
• %msg表示关联日志
• %n表示分隔符换行符。

2.1 详细配置

这个定义了每个符号代表的意
详情点此

2.2 设置日志每个部分的color

Grouping by parentheses as explained above allows coloring of sub-patterns. As of version 1.0.5, PatternLayout recognizes “%black”, “%red”, “%green”,”%yellow”,”%blue”, “%magenta”,”%cyan”, “%white”, “%gray”, “%boldRed”,”%boldGreen”, “%boldYellow”, “%boldBlue”, “%boldMagenta”“%boldCyan”, “%boldWhite” and “%highlight” as conversion words.

<configuration debug="true">
  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
    <!-- On Windows machines setting withJansi to true enables ANSI
         color code interpretation by the Jansi library. This requires
         org.fusesource.jansi:jansi:1.8 on the class path.  Note that
         Unix-based operating systems such as Linux and Mac OS X
         support ANSI color codes by default. -->
    <withJansi>true</withJansi>
    <encoder>
      <pattern>[%thread] %highlight(%-5level) %cyan(%logger{15}) - %msg %n</pattern>
    </encoder>
  </appender>
  <root level="DEBUG">
    <appender-ref ref="STDOUT" />
  </root>
</configuration>

3.自定义日志格式

实现LayoutBase接口

package chapters.layouts;

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

public class MySampleLayout extends LayoutBase<ILoggingEvent> {

  public String doLayout(ILoggingEvent event) {
    StringBuffer sbuf = new StringBuffer(128);
    sbuf.append(event.getTimeStamp() - event.getLoggingContextVO.getBirthTime());
    sbuf.append(" ");
    sbuf.append(event.getLevel());
    sbuf.append(" [");
    sbuf.append(event.getThreadName());
    sbuf.append("] ");
    sbuf.append(event.getLoggerName();
    sbuf.append(" - ");
    sbuf.append(event.getFormattedMessage());
    sbuf.append(CoreConstants.LINE_SEP);
    return sbuf.toString();
  }
}

在配置文件中的配置

<configuration>

  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
    <encoder class="ch.qos.logback.core.encoder.LayoutWrappingEncoder">
      <layout class="chapters.layouts.MySampleLayout" />
    </encoder>
  </appender>

  <root level="DEBUG">
    <appender-ref ref="STDOUT" />
  </root>
</configuration>