mybatis+spring+c3p0+maven+ehcache

项目截图

pom.xml如下

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.alibaba</groupId>
    <artifactId>mybatispring</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <springversion>4.0.0.RELEASE</springversion>
        <junitversion>4.12</junitversion>
    </properties>

    <dependencies>

        <!-- junit -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>${junitversion}</version>
            <scope>test</scope>
        </dependency>

        <!-- db -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.35</version>
        </dependency>

        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.1.1</version>
        </dependency>
                <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.2.2</version>
        </dependency>

        <!-- spring -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${springversion}</version>
            <type>jar</type>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>${springversion}</version>
            <type>jar</type>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${springversion}</version>
            <type>jar</type>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>${springversion}</version>
            <type>jar</type>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${springversion}</version>
            <type>jar</type>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${springversion}</version>
            <type>jar</type>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>${springversion}</version>
            <type>jar</type>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>${springversion}</version>
            <type>jar</type>
            <scope>compile</scope>
        </dependency>

        <!-- cglib -->
        <dependency>
            <groupId>cglib</groupId>
            <artifactId>cglib</artifactId>
            <version>2.2.2</version>
        </dependency>

        <!-- log4j -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>

        <!-- c3p0数据源 -->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5-pre10</version>
        </dependency>
    </dependencies>

</project>

然后配置spring,applicationContext.xml

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-4.0.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx-4.0.xsd ">

    <!-- 加载配置文件 -->
    <context:property-placeholder location="classpath:db.properties" />

    <!-- 数据源，使用dbcp -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
        destroy-method="close">
        <property name="driverClass" value="${jdbc.driverClass}" />
        <property name="jdbcUrl" value="${jdbc.jdbcUrl}" />
        <property name="user" value="${jdbc.user}" />
        <property name="password" value="${jdbc.password}" />
        <property name="minPoolSize" value="${jdbc.miniPoolSize}" />
        <property name="maxPoolSize" value="${jdbc.maxPoolSize}" />
        <property name="initialPoolSize" value="${jdbc.initialPoolSize}" />
        <property name="maxIdleTime" value="${jdbc.maxIdleTime}" />
        <property name="acquireIncrement" value="${jdbc.acquireIncrement}" />

        <property name="acquireRetryAttempts" value="${jdbc.acquireRetryAttempts}" />
        <property name="acquireRetryDelay" value="${jdbc.acquireRetryDelay}" />
        <property name="testConnectionOnCheckin" value="${jdbc.testConnectionOnCheckin}" />
        <property name="automaticTestTable" value="${jdbc.automaticTestTable}" />
        <property name="idleConnectionTestPeriod" value="${jdbc.idleConnectionTestPeriod}" />
        <property name="checkoutTimeout" value="${jdbc.checkoutTimeout}" />

    </bean>

    <!-- sqlSessinFactory -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 加载mybatis的配置文件 -->
        <property name="configLocation" value="classpath:mybatis/SqlMapConfig.xml" />
        <!-- 数据源 -->
        <property name="dataSource" ref="dataSource" />
    </bean>

    <!-- 原始dao接口 -->

    <bean id="userDao" class="com.alibaba.dao.UserDaoImpl">
        <property name="sqlSessionFactory" ref="sqlSessionFactory" />
    </bean>

    <!-- mapper配置 MapperFactoryBean：根据mapper接口生成代理对象 -->
    <!-- <bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
        mapperInterface指定mapper接口 <property name="mapperInterface" value="cn.itcast.ssm.mapper.UserMapper"/>
        <property name="sqlSessionFactory" ref="sqlSessionFactory"/> </bean> -->
    <!-- mapper批量扫描，从mapper包中扫描出mapper接口，自动创建代理对象并且在spring容器中注册 遵循规范：将mapper.java和mapper.xml映射文件名称保持一致，且在一个目录
        中 自动扫描出来的mapper的bean的id为mapper类名（首字母小写） -->
    <!-- 指定扫描的包名 如果扫描多个包，每个包中间使用半角逗号分隔 -->
    <!-- <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property
        name="basePackage" value="cn.itcast.ssm.mapper"/> <property name="sqlSessionFactoryBeanName"
        value="sqlSessionFactory"/> </bean> -->

</beans>

引用的db.properties如下

jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.jdbcUrl = jdbc:mysql://localhost:3306/test
jdbc.user = root
jdbc.password = 123456
jdbc.miniPoolSize = 1
jdbc.maxPoolSize = 20
jdbc.initialPoolSize = 1
jdbc.maxIdleTime = 25000
jdbc.acquireIncrement = 1

jdbc.acquireRetryAttempts = 30
jdbc.acquireRetryDelay = 1000
jdbc.testConnectionOnCheckin = true
jdbc.automaticTestTable = c3p0TestTable
jdbc.idleConnectionTestPeriod = 18000
jdbc.checkoutTimeout=3000

SqlMapConfig.xml如下

<?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>

    <!-- 别名定义 -->
    <typeAliases>

        <!-- 批量别名定义
        指定包名，mybatis自动扫描包中的po类，自动定义别名，别名就是类名（首字母大写或小写都可以）
        -->
        <package name="com.alibaba"/>

    </typeAliases>

    <!-- 加载 映射文件 -->
    <mappers>
        <mapper resource="mybatis/UserMapper.xml"/>

        <!-- 批量加载mapper
        指定mapper接口的包名，mybatis自动扫描包下边所有mapper接口进行加载
        遵循一些规范：需要将mapper接口类名和mapper.xml映射文件名称保持一致，且在一个目录 中
        上边规范的前提是：使用的是mapper代理方法

        和spring整合后，使用mapper扫描器，这里不需要配置了
         -->
        <!-- <package name="cn.itcast.ssm.mapper"/> -->

    </mappers>

</configuration>

UserDao.java

package com.alibaba.dao;

import com.alibaba.po.User;

public interface UserDao {
    public User findUserById(int id) throws Exception;
}

UserDaoImpl.java

package com.alibaba.dao;

import org.apache.ibatis.session.SqlSession;
import org.mybatis.spring.support.SqlSessionDaoSupport;

import com.alibaba.po.User;

public class UserDaoImpl extends SqlSessionDaoSupport implements UserDao{

    public User findUserById(int id) throws Exception {
        SqlSession sqlSession = this.getSqlSession();
        User user = sqlSession.selectOne("mapper.UserMapper.getUser", id);
        return user;
    }

}

UserDaoTest.java

package com.alibaba.dao;

import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.alibaba.po.User;

public class UserDaoTest {

    private ApplicationContext applicationContext;

    //在setUp这个方法得到spring容器
    @Before
    public void setUp() throws Exception {
        applicationContext = new ClassPathXmlApplicationContext("classpath:spring/applicationContext.xml");
    }

    @Test
    public void testFindUserById() throws Exception {

        UserDao userDao = (UserDao) applicationContext.getBean("userDao");

        //调用userDao的方法
        User user = userDao.findUserById(1);

        System.out.println(user);

    }

}

log4j如下

# Global logging configuration
#\u5728\u5f00\u53d1\u73af\u5883\u4e0b\u65e5\u5fd7\u7ea7\u522b\u8981\u8bbe\u7f6e\u6210DEBUG\uff0c\u751f\u4ea7\u73af\u5883\u8bbe\u7f6e\u6210info\u6216error
log4j.rootLogger=DEBUG, stdout
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

如果项目运行会报c3p0找不到文件错误，那个没影响，只需要把Log4jdebug改为Info即可，生产环境就不会报错。

---

---

加入ehcache

    <!-- ehcache -->
    <dependency>
        <groupId>org.mybatis.caches</groupId>
        <artifactId>mybatis-ehcache</artifactId>
        <version>1.0.3</version>
    </dependency>
    <dependency>
        <groupId>net.sf.ehcache</groupId>
        <artifactId>ehcache-core</artifactId>
        <version>2.6.11</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.7.12</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>1.7.12</version>
    </dependency>
    <dependency>
        <groupId>cglib</groupId>
        <artifactId>cglib</artifactId>
        <version>2.2.2</version>
    </dependency>

配置文件ehcache.xml

<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:noNamespaceSchemaLocation="../config/ehcache.xsd">
    <diskStore path="D:\develop\ehcache" />
    <defaultCache
        maxElementsInMemory="1000"
        maxElementsOnDisk="10000000"
        eternal="false"
        overflowToDisk="false"
        timeToIdleSeconds="120"
        timeToLiveSeconds="120"
        diskExpiryThreadIntervalSeconds="120"
        memoryStoreEvictionPolicy="LRU">
    </defaultCache>
</ehcache>

<!-- name:缓存名称。
maxElementsInMemory：缓存最大个数。
eternal:对象是否永久有效，一但设置了，timeout将不起作用。
timeToIdleSeconds：设置对象在失效前的允许闲置时间（单位：秒）。仅当eternal=false对象不是永久有效时使用，可选属性，默认值是0，也就是可闲置时间无穷大。
timeToLiveSeconds：设置对象在失效前允许存活时间,最大时间介于创建时间和失效时间之间。仅当eternal=false对象不是永久有效时使用，默认是0.，也就是对象存活时 间无穷大。
overflowToDisk：当内存中对象数量达到maxElementsInMemory时，Ehcache将会对象写到磁盘中。
diskSpoolBufferSizeMB：这个参数设置DiskStore（磁盘缓存）的缓存区大小。默认是30MB。每个Cache都应该有自己的一个缓冲区。
maxElementsOnDisk：硬盘最大缓存个数。
diskPersistent：是否缓存虚拟机重启期数据 Whether the disk store persists between restarts of the Virtual Machine. The default value is false.
diskExpiryThreadIntervalSeconds：磁盘失效线程运行时间间隔，默认是120秒。
memoryStoreEvictionPolicy：当达到maxElementsInMemory限制时，Ehcache将会根据指定的策略去清理内存。默认策略是LRU。你可以设置为 FIFO或是LFU。
clearOnFlush：内存数量最大时是否清除。 -->

在SqlMapConfig.xml里设置，其实是默认设置好的，另外两个是设置延迟加载的没影响，第三个默认是true放这只是方便管理

<settings>
        <!-- 打开延迟加载 的开关 -->
        <setting name="lazyLoadingEnabled" value="true" />
        <!-- 将积极加载改为消极加载即按需要加载 -->
        <setting name="aggressiveLazyLoading" value="false" />
        <!-- 开启二级缓存 -->
        <setting name="cacheEnabled" value="true" />
    </settings>

在UserMapper.xml里配置

<cache type="org.mybatis.caches.ehcache.EhcacheCache"/>

此外User需要序列化，因为有可能缓存是存在硬盘上。

此时就可以使用ehcache了。