MyBatis 的 XML 配置文件結(jié)構(gòu)如下: 
configuration 配置 
	properties 屬性
	settings 設(shè)置
	typeAliases 類型命名
	typeHandlers 類型處理器
	objectFactory 對(duì)象工廠
	plugins 插件
	environments 環(huán)境 
		environment 環(huán)境變量 
		transactionManager 事務(wù)管理器
	dataSource 數(shù)據(jù)源

	databaseIdProviderchinese?
	mappers 映射器

<properties resource="jdbc.property">
	<property name="password" value="123456"/>
</properties>

<?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>
    <!--其他地方可以使用${password}來引用這個(gè)變量-->
    <properties resource="jdbc.property">
        <property name="password" value="123456"/>
    </properties>
    <!--MyBatis設(shè)置信息-->
    <settings>
        <!--啟用延遲加載數(shù)據(jù)、cacheEnabled，lazyLoadingEnabled-->
        <!--
			1、延遲加載：用的時(shí)候就查詢、不用的時(shí)候并不會(huì)查詢
			2、即使加載：不管你用不用、都會(huì)去數(shù)據(jù)庫查詢出來
		-->
        <setting name="cacheEnabled" value="true"/>
        <setting name="lazyLoadingEnabled" value="true"/>
        <!--選擇日志、選擇后需要導(dǎo)入對(duì)應(yīng)的jar包和配置-->
        <setting name="logImpl" value="log4j"/>
    </settings>
    <!--別名掃描包-->
    <typeAliases>
        <package name="package.mybatis.bean"/>
    </typeAliases>
    <!--數(shù)據(jù)源設(shè)置、可以設(shè)置多個(gè)數(shù)據(jù)源environment---
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="${driver}"/>
                <property name="url" value="${url}"/>
                <property name="username" value="${username}"/>
                <property name="password" value="${password}"/>
            </dataSource>
        </environment>
    </environments>
	<!--Mapper映射文件設(shè)置-->
    <mappers>
        <!--XML配置-->
        <mapper resource="package/mybatis/mapper/StudentMapper.xml"/>
        <!--單個(gè)接口配置-->
        <mapper class="package.mybatis.dao.StudentDao"/>
        <!--多個(gè)接口配置、包掃描模式、一次性配置package.mybatis.dao包下面的所有接口-->
        <package name="package.mybatis.dao"/>
    </mappers>
</configuration>

//@Intercepts:標(biāo)識(shí)該類是一個(gè)攔截器
//@Signature：指明自定義攔截器需要攔截哪一個(gè)類型，哪一個(gè)方法；
//	type：對(duì)應(yīng)四種類型中的一種；
//	method：對(duì)應(yīng)接口中的哪類方法（因?yàn)榭赡艽嬖谥剌d方法）；
//	args：方法參數(shù)
@Intercepts({
	@Signature(type = Executor.class, method = "update", args = { MappedStatement.class,Object.class }),
	@Signature(type = Executor.class, method = "query", args = { 				MappedStatement.class,Object.class,RowBounds.class,ResultHandler.class })
})
public class MyPlugin implements Interceptor {
	@Override
	public Object intercept(Invocation invocation) throws Throwable {
		if ("update".equals(invocation.getMethod().getName())) {
			MappedStatement mstt = (MappedStatement) invocation.getArgs()[0];
			Object object = invocation.getArgs()[1];
			Student info=(Student)object;
            //修改用戶sql語句的參數(shù)
			info.setName("我不是漢武帝");
		}
		System.out.println("方法執(zhí)行");
		return invocation.proceed();
	}
	@Override
	public Object plugin(Object target) {
		return Plugin.wrap(target, this);
	}
	@Override
	public void setProperties(Properties properties) {
	}
}
<!--配置文件-->
<plugins>
	<plugin interceptor="package.plugin.MyPlugin">
	    <property name="name" value="admin"/>
	</plugin>
</plugins>

1、修改mybatis-config.xml的setting設(shè)置
	<setting name="cacheEnabled" value="true"/>
2、Mapper.XML：加入：<cache/>
3、緩存的bean要實(shí)現(xiàn)序列化接口 Serializable
4、一定要關(guān)閉第一個(gè)sqlSession

//SqlSession:連接對(duì)象Connection、mybatis的session并不是會(huì)話，指的就是Sql的Connection
		SqlSession session1 = sqlSessionFactory.openSession();
		SqlSession session2 = sqlSessionFactory.openSession();
		
		//為了使用緩存、sql語句一定要統(tǒng)一規(guī)范
		StudentDao dao1=session1.getMapper(StudentDao.class);
		System.out.println("查詢一次數(shù)據(jù)");
		List<Student> list1 = dao1.getStudentAll();
		for (Student student : list1) {
			System.out.println(student);
		}
		session1.close();
		System.out.println("第二次查詢數(shù)據(jù)");
		Thread.sleep(10000);
		StudentDao dao2=session2.getMapper(StudentDao.class);
		System.out.println("查詢一次數(shù)據(jù)");
		List<Student> list2 = dao2.getStudentAll();
		for (Student student : list2) {
			System.out.println(student);
		}