log4j笔记

记录到能用的程度

首先官网下载

http://logging.apache.org/log4j/2.x/download.html

下载bin的那个

从中取出log4j-api-XX.jar和log4j-core-XX.jar导入进eclipse中(从properties--build path里面添加)

或者这些dependence加到pom.xml里面

<dependency>
         <groupId>org.slf4j</groupId>
         <artifactId>slf4j-api</artifactId>
         <version>1.7.2</version>
     </dependency>
     <dependency>
         <groupId>org.slf4j</groupId>
         <artifactId>slf4j-log4j12</artifactId>
         <version>1.7.2</version>
     </dependency>

classpath(src根目录或是src/main/resources,具体未解)下面建立log4j.properties

内容如下

#config root logger
log4j.rootLogger = INFO,system.out
log4j.appender.system.out=org.apache.log4j.ConsoleAppender
log4j.appender.system.out.layout=org.apache.log4j.PatternLayout
log4j.appender.system.out.layout.ConversionPattern=%5p{%F:%L} - %m%n
#log级别{文件名:行数} - 信息 换行


#config this Project.file logger
log4j.logger.thisProject.file=INFO,thisProject.file.out
log4j.appender.thisProject.file.out=org.apache.log4j.DailyRollingFileAppender
log4j.appender.thisProject.file.out.File=logContentFile.log
log4j.appender.thisProject.file.out.layout=org.apache.log4j.PatternLayout

配置就算好了

在想要输出log的类里创建logger对象并使用

首先import这些

import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;

创建logger对象

private static final Logger logger = LoggerFactory.getLogger(类名.class.getName());

然后用

logger.info("info");

logger.warn("warn");

logger.error("error");

等语句输出,输出格式在properties里面设置,具体不知

参考:

http://blog.csdn.net/lu8000/article/details/25754415

http://blog.sina.com.cn/s/blog_5f7d1a610100ebph.html

http://www.cnblogs.com/suman/archive/2010/10/23/1858864.html