在Apache Log4j中编码模式布局

Question

Trying to use the following pattern layout to print encoded log messages, so that \\n will not be printed as a new line in the logs.

  <layout class="org.apache.log4j.PatternLayout">
     <param name="ConversionPattern" value="%d{MM-dd-yyyy HH:mm:ss,SSS} %5p [%t] (%F:%L) - %enc{%m}%n"/>
  </layout>

But it literally prints %enc{ before every message and prints } at the end of the messages, instead of encoding them. \\n is also not being replaced.

Example: For this code logger.info("my \\n message") following is the output log

08-01-2018 01:26:37,642  INFO [localhost-startStop-1] (ClassName1.java:53) - %enc{my 
message}

instead it should be like,

08-01-2018 01:26:37,642  INFO [localhost-startStop-1] (ClassName1.java:53) - my message

Followed this document https://logging.apache.org/log4j/log4j-2.1/manual/layouts.html But I'm not sure what is wrong with the pattern.

Answer 1

You should determine the encoding format in curly brackets. For example %enc{%m}{HTML} encodes the message in HTML format. You could also use CRLF: enc{%m}{CRLF}