总结步骤如下：
- 建立一个log4j.properties文件，放到工程源文件夹下，如果是eclipse那么放到src下，eclipse会自动将这个文件加载到class目录下。如下图
如果是JB，那么要设置，这类型的文件也加载到目标项目中。 - 将log4j.jar和commons-logging.jar（我这次就是落下了这个jar，日了！）放到项目的类路径中，如果是web项目就是lib下。
- 配置的log4j.properties文件的例子。证明可用！
Xml代码
1. #--------------------------------
2. #
3. log4j.rootLogger=DEBUG, stdout, fileout
4. log4j.logger.test=info
5. log4j.logger.org.apache.jasper = DEBUG
6. log4j.logger.org.apache.catalina.startup.TldConfig = DEBUG
7. log4j.logger.org.apache.catalina.session.ManagerBase = DEBUG
8.
9. log4j.logger.com.fiscal = DEBUG
10. log4j.logger.com.system = DEBUG
11.
12. log4j.logger.com.ibatis = DEBUG
13. log4j.logger.com.ibatis.common.jdbc.SimpleDataSource = DEBUG
14. log4j.logger.com.ibatis.common.jdbc.ScriptRunner = DEBUG
15. log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate = DEBUG
16. log4j.logger.java.sql.Connection = DEBUG
17. log4j.logger.java.sql.Statement = DEBUG
18. log4j.logger.java.sql.PreparedStatement = DEBUG
19. log4j.logger.java.sql.ResultSet = DEBUG
20.
21. log4j.appender.stdout=org.apache.log4j.ConsoleAppender
22.
23. log4j.appender.fileout=org.apache.log4j.RollingFileAppender
24. log4j.appender.fileout.File=C:\\ibatis.log
25. log4j.appender.fileout.MaxFileSize=10000KB
26.
27. log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
28. log4j.appender.stdout.layout.ConversionPattern=[%-5p] %d{yyyy-MM-dd HH:mm:ss} :%m%n
29. log4j.appender.fileout.layout=org.apache.log4j.PatternLayout
30. log4j.appender.fileout.layout.ConversionPattern=[%-5p]_%d{yyyy-MM-dd HH:mm:ss} :%m%n
31.
32. log4j.appender.stdout.layout=org.apache.log4j.SimpleLayout
33.
34. log4j.logger.org=info
35. #--------------------------------#--------------------------------
#
log4j.rootLogger=DEBUG, stdout, fileout
#log4j.logger.test=info
#log4j.logger.org.apache.jasper = DEBUG
#log4j.logger.org.apache.catalina.startup.TldConfig = DEBUG
#log4j.logger.org.apache.catalina.session.ManagerBase = DEBUG
log4j.logger.com.fiscal = DEBUG
log4j.logger.com.system = DEBUG
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
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.fileout=org.apache.log4j.RollingFileAppender
log4j.appender.fileout.File=C:\\ibatis.log
log4j.appender.fileout.MaxFileSize=10000KB
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=[%-5p] %d{yyyy-MM-dd HH:mm:ss} :%m%n
log4j.appender.fileout.layout=org.apache.log4j.PatternLayout
log4j.appender.fileout.layout.ConversionPattern=[%-5p]_%d{yyyy-MM-dd HH:mm:ss} :%m%n
#log4j.appender.stdout.layout=org.apache.log4j.SimpleLayout
# log4j.logger.org=info
要看到SQL只要在connection和prepareStatement这里设置就可以了，其它的可不必 一大堆东西，扰乱视线
