Log4j模板【按天生成日志，根据日志类型分别】

1. 重写日志类型判断

import org.apache.log4j.DailyRollingFileAppender;
import org.apache.log4j.Priority;


public class MyAppender extends DailyRollingFileAppender {
    
    
    @Override
    public boolean isAsSevereAsThreshold(Priority priority) {
    
    
        // 只判断是否相等，而不判断优先级
        return this.getThreshold().equals(priority);
    }
}

2. 编写配置文件【main/resources/log4j.properties】

log4j.rootLogger=DEBUG,console,D,E

# 按天保存INFO类型日志
log4j.appender.D=conf.MyAppender
log4j.appender.D.File=D:/logs/info/info
log4j.appender.D.DatePattern='.'yyyy-MM-dd'.txt'
log4j.appender.D.Append = true
log4j.appender.D.Threshold = INFO 
log4j.appender.D.layout=org.apache.log4j.PatternLayout
log4j.appender.D.layout.ConversionPattern=%-d{
    
    yyyy-MM-dd HH:mm:ss,SSS} - [%p]-[%l] %m%n
# 按天保存ERROR类型日志
log4j.appender.E=conf.MyAppender
log4j.appender.E.File=D:/logs/error/error
log4j.appender.E.DatePattern='.'yyyy-MM-dd'.txt'
log4j.appender.E.Append = true
log4j.appender.E.Threshold = ERROR 
log4j.appender.E.layout=org.apache.log4j.PatternLayout
log4j.appender.E.layout.ConversionPattern=%-d{
    
    yyyy-MM-dd HH:mm:ss,SSS} - [%p]-[%l] %m%n