log4j 简单输出及配置

jar 包

log4j.properties

 1 ### 设置###
 2 log4j.rootLogger = debug,stdout,D,E
 3 
 4 ### 输出信息到控制抬 ###
 5 log4j.appender.stdout = org.apache.log4j.ConsoleAppender
 6 log4j.appender.stdout.Target = System.out
 7 log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
 8 log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n
 9 
10 ### 输出DEBUG 级别以上的日志到=d://logs/log.log ###
11 log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
12 log4j.appender.D.File = D://logs/log.log
13 log4j.appender.D.Append = true
14 log4j.appender.D.Threshold = DEBUG 
15 log4j.appender.D.layout = org.apache.log4j.PatternLayout
16 log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n
17 
18 ### 输出ERROR 级别以上的日志到=d://logs/error.log ###
19 log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
20 log4j.appender.E.File =D://logs/error.log 
21 log4j.appender.E.Append = true
22 log4j.appender.E.Threshold = ERROR 
23 log4j.appender.E.layout = org.apache.log4j.PatternLayout
24 log4j.appender.E.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n

main 方法

 1 package com;
 2 
 3 import org.apache.log4j.Logger;
 4 
 5 public class Test {
 6     private static Logger log = Logger.getLogger(Test.class);
 7     
 8     
 9     public static void main(String[] args) {
10         
11           for(int i=0;i<3;i++){
12                 log.debug("debug message");
13                 log.info("info message");
14                 log.error("error message");
15             }
16         
17         
18     }
19     
20 }

控制台输出

 1 [DEBUG] 2018-08-05 13:16:08,112 method:com.Test.main(Test.java:12)
 2 debug message
 3 [INFO ] 2018-08-05 13:16:08,115 method:com.Test.main(Test.java:13)
 4 info message
 5 [ERROR] 2018-08-05 13:16:08,116 method:com.Test.main(Test.java:14)
 6 error message
 7 [DEBUG] 2018-08-05 13:16:08,116 method:com.Test.main(Test.java:12)
 8 debug message
 9 [INFO ] 2018-08-05 13:16:08,116 method:com.Test.main(Test.java:13)
10 info message
11 [ERROR] 2018-08-05 13:16:08,116 method:com.Test.main(Test.java:14)
12 error message
13 [DEBUG] 2018-08-05 13:16:08,117 method:com.Test.main(Test.java:12)
14 debug message
15 [INFO ] 2018-08-05 13:16:08,117 method:com.Test.main(Test.java:13)
16 info message
17 [ERROR] 2018-08-05 13:16:08,119 method:com.Test.main(Test.java:14)
18 error message

本地文件