4.门面Slf4j+slf4j-log4j12+log4j

1.导入pom依赖

<!--slf4j core 使用slf4j必須添加-->
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>1.7.27</version>
</dependency>
<!--log4j实现-->
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-log4j12</artifactId>
    <version>1.7.27</version>
</dependency>
<dependency>
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>1.2.17</version>
</dependency>

2.增加log4j配置文件

log4j.properties
### set log levels ###
log4j.rootLogger = INFO,stdout,E

### out console ###
log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target = System.out
log4j.appender.stdout.Threshold = INFO
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern =%d{yyyy-M-d HH\:mm\:ss}%x[%5p](%F\:%L) %m%n
log4j.appender.stdout.MaxFileSize=10000KB
log4j.appender.stdout.MaxBackupIndex=5


### out error log ###
log4j.appender.E =org.apache.log4j.DailyRollingFileAppender
log4j.appender.E.File =../logs/easyAom_error.log
log4j.appender.E.Append = true
log4j.appender.E.Threshold = WARN
log4j.appender.E.layout = org.apache.log4j.PatternLayout
log4j.appender.E.layout.ConversionPattern =%d{yyyy-M-d HH\:mm\:ss}%x[%5p](%F\:%L) %m%n

3.使用

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class Test {
    private final static Logger log = LoggerFactory.getLogger(Test.class);
    public static void main(String[] args) {
        log.info("ddddd");
    }
}