log4j可以支援將log輸出到檔案，資料庫，甚至遠端伺服器，這次給大家分享下如何輸出到mysql中。

1、配置log4j.properties檔案

log4j.properties的配置內容如下：

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/lyz_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、建立資料資料庫表

  create database `lyz_log4j_write_mysql`;  
  use `lyz_log4j_write_mysql`;  
  CREATE TABLE `zuidaima_log` (  
    `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,  
    `create_time` datetime NOT NULL,  
    `log` text default NULL,  
    PRIMARY KEY (`id`)  
  ) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;