一,添加log4j依赖包
可从官网上下载该依赖包log4j-x.x.xx.jar,下载后 build path,添加依赖包如使用maven,可以添加如下依赖
<!-- https://mvnrepository.com/artifact/log4j/log4j --> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency>
二,创建 log4j.properties 配置文件
log4j.properties配置文件用来配置 日志的输出格式、输出的地址....
### set log levels ### log4j.rootLogger = INFO, D, E log4j.appender.D = org.apache.log4j.RollingFileAppender log4j.appender.D.File =${scheduleProject}WEB-INF/logs/schedule.log log4j.appender.D.Append = true log4j.appender.D.Threshold = DEBUG log4j.appender.D.MaxFileSize = 50000KB log4j.appender.D.layout = org.apache.log4j.PatternLayout log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n log4j.appender.E = org.apache.log4j.RollingFileAppender log4j.appender.E.File = ${scheduleProject}WEB-INF/logs/schedule.log log4j.appender.E.Append = true log4j.appender.E.Threshold = ERROR log4j.appender.E.MaxFileSize = 50000KB log4j.appender.E.layout = org.apache.log4j.PatternLayout log4j.appender.E.layout.ConversionPattern =%-d{yyyy-MM-dd HH:mm:ss} [ %l:%c:%t:%r ] - [ %p ] %m%n
三,在web.xml文件中 配置 加载 log4j.properties的属性
<!-- 加载log4j的配置文件log4j.properties --> <context-param> <param-name>log4jConfigLocation</param-name> <param-value>/WEB-INF/log4j.properties</param-value> </context-param> <!-- 设定刷新日志配置文件的时间间隔,这里设置为10s --> <context-param> <param-name>log4jRefreshInterval</param-name> <param-value>10000</param-value> </context-param> <!-- 加载Spring框架中的log4j监听器Log4jConfigListener --> <listener> <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class> </listener> <!-- 为避免项目间冲突,定义唯一的 webAppRootKey --> <context-param> <param-name>webAppRootKey</param-name> <param-value>scheduleProject</param-value> </context-param>
四,在代码中使用log4j进行日志记录
public class Test { private static Logger logger = Logger.getLogger(Test.class); public static void main(String[]args) { logger.info("23423"); logger.warn("sdfsdf"); } }
五,参考资料