log4j layout ConversionPattern符号说明

如果使用pattern布局就要指定的打印信息的具体格式ConversionPattern，打印参数如下：

 

示例：

log4j.appender.R.layout.ConversionPattern=%d{yyyy-MMM-dd HH:mm:ss,SSS}-[TS] %p %t %c - %m%n

输出：2012-06-06 10:45:30,000-[TS] INFO thread30 TestClass - 记录的日志

PATTERN FORMATS GLOSSARY
  %n - newline
  %m - your log message
  %p - message priority (FATAL, ERROR, WARN, INFO, DEBUG or custom)
  %r - millisecs since program started running
  %% - percent sign in output

SOME MORE CLUTTER IN YOUR LOG
  %c - name of your category (logger), %c{2} will outputs last two components
  %t - name of current thread
  %x - Nested Diagnostic Context (NDC) (you supply it)

SLOW PERFORMANCE FORMATS
  %d - date and time, also %d{ISO8601}, %d{DATE}, %d{ABSOLUTE},
       %d{HH:mm:ss,SSS}, %d{dd MMM yyyy HH:mm:ss,SSS} and so on
  %l - Shortcut for %F%L%C%M
  %F - Java source file name
  %L - Java source line number
  %C - Java class name, %C{1} will output the last one component
  %M - Java method name

FORMAT MODIFIERS
  %-any_letter_above  - Left-justify in min. width (default is right-justify)
  %20any_letter_above - 20 char. min. width (pad with spaces if reqd.)
  %.30any_letter_above- 30 char. max. width (truncate beginning if reqd.)
  %-10.10r            - Example. Left-justify time elapsed within 10-wide field.
                        Truncate from beginning if wider than 10 characters.