Log4j specific level and output information configuration method Introduction

Log4j a total of 5 log output levels:

FATAL (0) <error (3) <warn (4) <info (6) DEBUG < (7)

Example:

Log4j.rootlogger=debug,console, File
The above settings can fetch the throw new RuntimeException ();
Log4j.rootlogger=info,console, File
The info level will not catch the throw new RuntimeException ();

The reason is that this error belongs to DEBUG level debug>info>error so INFO cannot be caught

Console output log information configuration, such as:

Modify the Log4j.properties log level, the general error is sure to output, there is a warning message warn:log4j.rootlogger=warn  on it.