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mybatis/mybatis-config.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE configuration
+        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
+        "http://mybatis.org/dtd/mybatis-3-config.dtd">
+<configuration>
+    <settings>
+        <setting name="logImpl" value="JDK_LOGGING"/>
+    </settings>
+    <typeAliases>
+        <package name="com.test.entity"/>
+<!--        mybatis扫描包里的类，别名为类名的小写 resultType不需要写完整的包.类名，直接用别名了-->
+    </typeAliases>
+    <environments default="development">
+        <environment id="development">
+            <transactionManager type="JDBC"/>
+            <dataSource type="POOLED">
+                <property name="driver" value="com.mysql.cj.jdbc.Driver"/>
+                <property name="url" value="jdbc:mysql://localhost:3306/learn"/>
+                <property name="username" value="root"/>
+                <property name="password" value="123456"/>
+            </dataSource>
+        </environment>
+    </environments>
+    <mappers>
+        <package name="com.test.mapper"/>
+<!--        <mapper class="com.test.mapper.TestMapper"/>-->
+<!--        url是xml文件在外部-->
+<!--        resource是xml文件在内部-->
+    </mappers>
+
+</configuration>

mybatis/mybatis.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="lombok" level="project" />
+    <orderEntry type="library" name="mybatis-3.5.7" level="project" />
+    <orderEntry type="library" name="mysql-connector-java-8.0.27" level="project" />
+    <orderEntry type="library" name="junit-4.13.2" level="project" />
+    <orderEntry type="library" name="hamcrest-core-1.1" level="project" />
+  </component>
+</module>

mybatis/src/com/test/Main.java

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+package com.test;
+
+import com.test.MybatisUtil;
+import com.test.entity.Student;
+import com.test.mapper.TestMapper;
+import lombok.SneakyThrows;
+import org.apache.ibatis.session.SqlSession;
+import org.apache.ibatis.session.SqlSessionFactory;
+import org.apache.ibatis.session.SqlSessionFactoryBuilder;
+
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Properties;
+import java.util.logging.*;
+
+public class Main {
+    public static void main(String[] args) throws FileNotFoundException {
+//        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(new FileInputStream("mybatis-config.xml"));
+//        try(SqlSession session=sqlSessionFactory.openSession(true)){
+//            List<Student> list =session.selectList("selectStudent");
+//            list.forEach(System.out::println);
+//
+//        }
+        try (SqlSession session = MybatisUtil.getSession(true)) {
+                TestMapper mapper=session.getMapper(TestMapper.class);
+            System.out.println(mapper.addStudent(new Student().setName("BBB").setSid(114541)));
+            mapper.deleteStudent(65454);
+            XMLFormatter xmlFormatter=new XMLFormatter();
+            SimpleFormatter simpleFormatter=new SimpleFormatter();
+            Logger logger=Logger.getLogger(Main.class.getName());
+
+            FileHandler fileHandler=new FileHandler("test.log",true);
+            fileHandler.setFormatter(simpleFormatter);
+            fileHandler.setLevel(Level.WARNING);
+            logger.addHandler(fileHandler);
+
+
+            logger.setLevel(Level.WARNING);
+            logger.setUseParentHandlers(false);
+            ConsoleHandler consoleHandler=new  ConsoleHandler();
+            consoleHandler.setLevel(Level.WARNING);
+            logger.addHandler(consoleHandler);
+
+            logger.setFilter(record -> !record.getMessage().contains("!"));
+
+            logger.log(Level.SEVERE,"server warning!!!!!");
+            logger.log(Level.WARNING,"warning");
+            logger.log(Level.INFO,"info!!");
+            logger.log(Level.CONFIG,"config!!!");
+            System.out.println(logger.getParent().getClass());
+
+//            Map<String,String>map=new HashMap<>();
+//            map.put("number",null);
+//            System.out.println(map);      区别：map的valuie值可以为空  properties值不能为空
+
+            Properties properties=new Properties();
+            properties.load(new FileInputStream("test.properties"));
+//            properties.put("number",null);
+            properties.store(System.out,"Look here");
+            System.getProperties().forEach((k,v)->System.out.println(k+":"+v));
+
+
+
+
+
+
+
+
+
+
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+}

mybatis/src/com/test/MybatisUtil.java

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+package com.test;
+
+import org.apache.ibatis.session.SqlSession;
+import org.apache.ibatis.session.SqlSessionFactory;
+import org.apache.ibatis.session.SqlSessionFactoryBuilder;
+
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+
+public class MybatisUtil {
+    //在类加载时就进行创建
+    private static SqlSessionFactory sqlSessionFactory;
+    static {
+        try {
+            sqlSessionFactory = new SqlSessionFactoryBuilder().build(new FileInputStream("mybatis-config.xml"));
+        } catch (FileNotFoundException e) {
+            e.printStackTrace();
+        }
+    }
+
+    /**
+     * 获取一个新的会话
+     * @param autoCommit 是否开启自动提交（跟JDBC是一样的，如果不自动提交，则会变成事务操作）
+     * @return SqlSession对象
+     */
+    public static SqlSession getSession(boolean autoCommit){
+        return sqlSessionFactory.openSession(autoCommit);
+    }
+}

mybatis/src/com/test/entity/Student.java

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+package com.test.entity;
+
+import lombok.Data;
+import lombok.experimental.Accessors;
+
+@Data
+@Accessors(chain = true)
+public class Student {
+
+    String name;
+    int sid;
+
+
+
+}

mybatis/src/com/test/log/Main.java

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+package com.test.log;
+
+
+import lombok.extern.java.Log;
+@Log(topic = "小王八")
+public class Main {
+    public static void main(String[] args) {
+        System.out.println(log.getName());
+        log.info("Look here");
+    }
+}

mybatis/src/com/test/mapper/TestMapper.java

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+package com.test.mapper;
+
+import com.test.entity.Student;
+import org.apache.ibatis.annotations.*;
+
+public interface TestMapper {
+    @Insert("insert into student values(#{name},#{sid})")
+    String addStudent(Student student);
+    @Delete("delete from student where sid=#{sid}")
+    void deleteStudent(int sid);
+    @Select("select *from student where sid=#{sid}")
+    String getStudent(int sid);
+}

mybatis/src/com/test/test/MainTest.java

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+package com.test.test;
+
+import com.test.entity.Student;
+import com.test.mapper.TestMapper;
+import lombok.extern.java.Log;
+import org.apache.ibatis.session.SqlSession;
+import org.apache.ibatis.session.SqlSessionFactory;
+import org.apache.ibatis.session.SqlSessionFactoryBuilder;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.util.logging.LogManager;
+
+
+@Log
+public class MainTest {
+
+    private SqlSessionFactory sqlSessionFactory;
+    @Before
+    public void before(){
+        try {
+            sqlSessionFactory = new SqlSessionFactoryBuilder()
+                    .build(new FileInputStream("mybatis-config.xml"));
+            LogManager manager = LogManager.getLogManager();
+            manager.readConfiguration(new FileInputStream("test.properties"));
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    @Test
+    public void test(){
+        try(SqlSession sqlSession = sqlSessionFactory.openSession(true)){
+            TestMapper mapper = sqlSession.getMapper(TestMapper.class);
+            log.info(mapper.getStudent(2).toString());
+        }
+    }
+}

mybatis/src/com/test/test/TestFormatter.java

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+package com.test.test;
+
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.logging.Formatter;
+import java.util.logging.LogRecord;
+
+public class TestFormatter extends Formatter {
+    @Override
+    public String format(LogRecord record) {
+        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
+        String time = format.format(new Date(record.getMillis()));  //格式化日志时间
+        return time + " : " + record.getMessage() + "\n";
+    }
+}

mybatis/test.log

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+八月 15, 2022 7:04:02 下午 com.test.Main main
+严重: server warning!!!!!
+八月 15, 2022 7:04:02 下午 com.test.Main main
+警告: warning
+八月 15, 2022 7:04:21 下午 com.test.Main main
+严重: server warning!!!!!
+八月 15, 2022 7:04:21 下午 com.test.Main main
+警告: warning
+八月 15, 2022 7:12:06 下午 com.test.Main main
+警告: warning
+八月 15, 2022 7:22:20 下午 com.test.Main main
+警告: warning
+八月 15, 2022 7:22:37 下午 com.test.Main main
+警告: warning
+八月 15, 2022 7:23:19 下午 com.test.Main main
+警告: warning
+八月 15, 2022 7:29:38 下午 com.test.Main main
+警告: warning
+八月 15, 2022 7:29:54 下午 com.test.Main main
+警告: warning
+八月 15, 2022 7:30:20 下午 com.test.Main main
+警告: warning
+八月 15, 2022 7:33:22 下午 com.test.Main main
+警告: warning
+八月 15, 2022 7:33:57 下午 com.test.Main main
+警告: warning
+八月 15, 2022 7:38:42 下午 com.test.Main main
+警告: warning
+八月 15, 2022 7:42:55 下午 com.test.Main main
+警告: warning

mybatis/test.properties

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+handlers= java.util.logging.ConsoleHandler
+.level= ALL
+java.util.logging.ConsoleHandler.level = ALL
+java.util.logging.ConsoleHandler.formatter = com.test.TestFormatter