log4j可以支持将log输出到文件，数据库，甚至远程服务器，这次给大家分享下如何输出到mysql中。

（1）log4j.properties的配置内容如下：

log4j.rootLogger=ERROR,appender1,appender2    log4j.appender.appender1=org.apache.log4j.ConsoleAppender  log4j.appender.appender1.layout=org.apache.log4j.PatternLayout  log4j.appender.appender1.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss:SSS}[%p]: %m%n      log4j.appender.appender2=org.apache.log4j.jdbc.JDBCAppender  log4j.appender.appender2.driver=com.mysql.jdbc.Driver  log4j.appender.appender2.URL=jdbc:mysql://localhost:3306/zuidaima_log4j_write_mysql?useUnicode=true&characterEncoding=UTF-8  log4j.appender.appender2.user=root  log4j.appender.appender2.password=111111  log4j.appender.appender2.sql=insert into zuidaima_log (create_time,log) VALUES ('%d{yyyy-MM-dd hh:mm:ss}', '%c %p %m %n')  log4j.appender.appender2.layout=org.apache.log4j.PatternLayout

（2）mysql建表语句

    create database `zuidaima_log4j_write_mysql`;        use `zuidaima_log4j_write_mysql`;        CREATE TABLE `zuidaima_log` (          `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,          `create_time` datetime NOT NULL,          `log` varchar(200) NOT NULL,          PRIMARY KEY (`id`)        ) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;