在META-INF/druid-filter.properties文件中配置Filter的别名。

Filter类名	别名
default	com.alibaba.druid.filter.stat.StatFilter
stat	com.alibaba.druid.filter.stat.StatFilter
mergeStat	com.alibaba.druid.filter.stat.MergeStatFilter
encoding	com.alibaba.druid.filter.encoding.EncodingConvertFilter
log4j	com.alibaba.druid.filter.logging.Log4jFilter
slf4j	com.alibaba.druid.filter.logging.Slf4jLogFilter
commonlogging	com.alibaba.druid.filter.logging.CommonsLogFilter