Use of log4j

1. introduce it in Maven Pom. xml

<Dependency> <groupid> log4j </groupid> <artifactid> log4j </artifactid> </dependency>

In Java programs, it is best not to use statements such as system. Out. println (); because such statements are too slow and occupy a lot of memory. Therefore, we recommend that you use log4j to output information.

2. Examples used in Java:

Public class userserviceimpl implement userservice {Private Static final logger = logger. getlogger (userserviceimpl. class); Public void test () {logger.info ("information display ..... ");}}

3. For log4j configuration, in log4g. properties, you can configure the attributes of this file on your own.

 

Use of log4j