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
