1.在pom.xml中引入maven依賴

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

2.在resources資料夾下編寫log4j.properties配置檔案

 1 #將等級為DEBUG的日誌資訊輸出到console和file這兩個目的地，console和file的定義在下面的程式碼
 2
 
 log4j.rootLogger=DEBUG,console,file
 3 
 4 #控制檯輸出的相關設定
 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 #檔案輸出的相關設定
12 log4j.appender.file = org.apache.log4j.RollingFileAppender
13 log4j.appender.file.File=./log/xiaoma.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 #日誌輸出級別
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

3.在mybatis-config.xml核心配置檔案中新增log4j配置

<settings>
   <setting name="logImpl" value="LOG4J"/>
</settings>

4.編寫測試檔案

 1 package com.xiaoma;
 2 
 3 import com.xiaoma.entity.User;
 4 import com.xiaoma.mapper.UserMapper;
 5 import com.xiaoma.util.ConnectMySQLUtil;
 6 import org.apache.ibatis.session.SqlSession;
 7 import org.junit.Test;
 8 
 9 import java.util.List;
10 
11 public class test {
12     static Logger logger = Logger.getLogger(MyTest.class);
13     @Test
14     public void selectUser() {
15        logger.info("info：進入selectUser方法");
16        logger.debug("debug：進入selectUser方法");
17        logger.error("error: 進入selectUser方法");
18        SqlSession session = MybatisUtils.getSession();
19        UserMapper mapper = session.getMapper(UserMapper.class);
20        List<User> users = mapper.selectUser();
21        for (User user: users){
22            System.out.println(user);
23       }
24        session.close();
25     } 
26 }
27