事实上主要是log4j配置，跟SSI关系不大。

web.xml中加入

<context-param>

      <param-name>log4jConfigLocation</param-name>

      <param-value>/WEB-INF/localconf/log4j.properties</param-value>

   </context-param>

   <context-param>

      <param-name>log4jRefreshInterval</param-name>

      <param-value>6000</param-value>

   </context-param>

    <listener>

      <listener-class>

        org.springframework.web.util.Log4jConfigListener

      </listener-class>

加入log4j.properties文件

#log4j.rootLogger = [ level ] , appenderName, appenderName, ...

log4j.rootLogger = DEBUG, console, R

#level=INFO,all can be output

#console is set to be a ConsoleAppender

log4j.appender.console = org.apache.log4j.ConsoleAppender

#console have four patterns

#org.apache.log4j.HTMLLayout

#org.apache.log4j.PatternLayout

#org.apache.log4j.SimpleLayout

#org.apache.log4j.TTCCLayout

log4j.appender.console.layout = org.apache.log4j.PatternLayout

#define the output type

log4j.appender.console.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [%c]-[%p] %m%n

#file is set to output to a extra file

log4j.appender.R = org.apache.log4j.RollingFileAppender

#the absolute route of the log4j file

log4j.appender.R.File = /log.txt

#the size

log4j.appender.R.MaxFileSize = 500KB

#back up a file

log4j.appender.R.MaxBackupIndex = 1

log4j.appender.R.layout = org.apache.log4j.PatternLayout

log4j.appender.R.layout.ConversionPattern=%-d{yyyy-MM-dd HH:mm:ss} [%c]-[%p] - %m%n

log4j.logger.com.ibatis=DEBUG

log4j.logger.com.ibatis.common.jdbc.SimpleDataSource=DEBUG

log4j.logger.com.ibatis.common.jdbc.ScriptRunner=DEBUG

log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate=DEBUG

log4j.logger.java.sql.Connection=DEBUG

log4j.logger.java.sql.Statement=DEBUG

log4j.logger.java.sql.PreparedStatement=DEBUG

log4j.logger.java.sql.ResultSet=DEBUG