spring配置log4j

1.引入log4j-xxx.jar包，buildpath.

2.在项目的根目录下新建resources名的文件夹，注意是source folder，并新建log4j.properties文件

3.在log4j.properties中配置：

#LOG_DIR:/usr/local/.../logs
LOG_DIR = E:\\logs
#Level:ERROR,WARN,INFO,DEBUG
log4j.rootLogger = DEBUG,Console,FileInfo,FileError

log4j.appender.Console = org.apache.log4j.ConsoleAppender
log4j.appender.Console.Threshold = DEBUG
log4j.appender.Console.ImmediateFlush = true
log4j.appender.Console.Target = SYSTEM_OUT
log4j.appender.Console.layout = org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n

log4j.appender.FileInfo = org.apache.log4j.DailyRollingFileAppender
log4j.appender.FileInfo.Threshold = INFO
log4j.appender.FileInfo.ImmediateFlush = true
log4j.appender.FileInfo.Append = true
log4j.appender.FileInfo.DatePattern = '_'yyyy-MM-dd'.log'
log4j.appender.FileInfo.encoding=UTF-8
log4j.appender.FileInfo.File = ${LOG_DIR}/info
log4j.appender.FileInfo.layout = org.apache.log4j.PatternLayout
log4j.appender.FileInfo.layout.ConversionPattern = [%-5p][%d{ISO8601}]%m%n

log4j.appender.FileError = org.apache.log4j.DailyRollingFileAppender
log4j.appender.FileError.Threshold = ERROR
log4j.appender.FileError.ImmediateFlush = true
log4j.appender.FileError.Append = true
log4j.appender.FileError.DatePattern = '_'yyyy-MM-dd'.log'
log4j.appender.FileError.encoding=UTF-8
log4j.appender.FileError.File = ${LOG_DIR}/error
log4j.appender.FileError.layout = org.apache.log4j.PatternLayout
log4j.appender.FileError.layout.ConversionPattern = [%-5p][%d{ISO8601}]%m%n

log4j.appender.cn.yivi.service.pay = info,pay
log4j.additivity.cn.yivi.service.pay = false
log4j.appender.pay = org.apache.log4j.DailyRollingFileAppender
log4j.appender.pay.Threshold = WARN
log4j.appender.pay.ImmediateFlush = true
log4j.appender.pay.Append = true
log4j.appender.pay.DatePattern = '_'yyyy-MM-dd'.log'
log4j.appender.pay.encoding=UTF-8
log4j.appender.pay.File = ${LOG_DIR}/pay
log4j.appender.pay.layout = org.apache.log4j.PatternLayout

log4j.appender.pay.layout.ConversionPattern = [%-5p][%d{ISO8601}]%m%n

tips：日志文件的位置

1）绝对路径

log4j.appender.R.File=D:/log/xxx.log

2）相对路径：

log4j.appender.R.File=../logs/app.log，将日志记录到tomcat下的logs文件夹；

log4j.appender.R.File=logs/app.log，将日志记录到tomcat的bin目录下的logs文件夹；

（3）使用环境变量相对路径法：程序会优先找jvm环境变量，然后再找系统环境变量，来查找配置文件中的变量。

        log4j.appender.logfile.File=${user.dir}/logs/app.log，使用tomcat容器时${user.dir}对应tomcat的bin目录；

        log4j.appender.logfile.File=${user.home}/logs/app.log，${user.home}对应操作系统当前用户目录；

log4j.appender.logfile.File=${webApp.root}/logs/app.log，${webApp.root}对应当前应用根目录；

4.在web.xml中配置log4j:

<!-- 配置日志   start-->
    <!-- 加载Log4J 配置文件  -->
    <context-param>
        <param-name>log4jConfigLocation</param-name>
        <param-value> classpath:log4j.properties</param-value>
    </context-param>     

    <context-param>
        <param-name>log4jRefreshInterval</param-name>
          <param-value>3000</param-value>
     </context-param>  

    <listener>
        <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
     </listener>

  <!-- 配置日志   end-->

4.