1 <settings>
2     <setting name="logImpl" value="STDOUT_LOGGING"/>
3 </settings>

1 <dependency>
2     <groupId>log4j</groupId>
3     <artifactId>log4j</artifactId>
4     <version>1.2.17</version>
5 </dependency>

1 <settings>
2     <setting name="logImpl" value="LOG4J"/>
3 </settings>

 1 #将等级为DEBUG的日志信息输出到console和file这两个目的地，console和file的定义在下面的代码
 2 log4j.rootLogger=DEBUG,console,file
 3 
 4 #控制台输出的相关设置
 5 log4j.appender.console = org.apache.log4j.ConsoleAppender
 6 log4j.appender.console.Target = System.out
 7 log4j.appender.console.Threshold=DEBUG
 8 log4j.appender.console.layout = org.apache.log4j.PatternLayout
 9 log4j.appender.console.layout.ConversionPattern=[%c]-%m%n
10 
11 #文件输出的相关设置
12 log4j.appender.file = org.apache.log4j.RollingFileAppender
13 log4j.appender.file.File=./log/wzh.log
14 log4j.appender.file.MaxFileSize=10mb
15 log4j.appender.file.Threshold=DEBUG
16 log4j.appender.file.layout=org.apache.log4j.PatternLayout
17 log4j.appender.file.layout.ConversionPattern=[%p][%d{yy-MM-dd}][%c]%m%n
18 
19 #日志输出级别
20 log4j.logger.org.mybatis=DEBUG
21 log4j.logger.java.sql=DEBUG
22 log4j.logger.java.sql.Statement=DEBUG
23 log4j.logger.java.sql.ResultSet=DEBUG
24 log4j.logger.java.sql.PreparedStatement=DEBUG

 1 import edu.ustc.wzh.pojo.User;
 2 import edu.ustc.wzh.utils.MybatisUtils;
 3 import org.apache.ibatis.session.SqlSession;
 4 import org.apache.log4j.Logger;
 5 import org.junit.Test;
 6 
 7 public class UserMapperTest {
 8 
 9     //注意导包：org.apache.log4j.Logger
10     static Logger logger = Logger.getLogger(UserMapperTest.class);
11     
12     @Test
13     public void selectUser() {
14     
15         logger.info("info：进入selectUser方法");
16         logger.debug("debug：进入selectUser方法");
17         logger.error("error: 进入selectUser方法");
18     
19         SqlSession session = MybatisUtils.getSession();
20     
21         UserMapper mapper = session.getMapper(UserMapper.class);
22     
23         User user = mapper.getUserById(1);
24         System.out.println(user);
25     
26         session.close();
27     }
28 
29 }