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在实际开发中MyBatis都是与Spring整合在一起使用的，在之前学习了MyBatis与Spring，现在来学习如何使他们整合
首先创建一个名为chapter10的web项目
一、环境搭建
1.准备好所有的有关jar包，具体如下：
将上面所有jar包添加到项目lib目录下，并发布到类路径下
2.编写配置文件
在src目录下创建db.properties文件，Spring配置文件以及MyBatis的配置文件，三个文件分别如下所示：
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis
jdbc.username=root
jdbc.password=itcast
jdbc.maxTotal=30
jdbc.maxIdle=10
jdbc.initialSize=5<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.3.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.3.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-4.3.xsd">
<!-- 读取dp.properties -->
<context:property-placeholder location="classpath:db.properties"/>
<!-- 配置数据源 -->
<bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource">
<!-- 数据库驱动 -->
<property name="driverClassName" value="${jdbc.driver}" />
<!-- 连接数据库的url -->
<property name="url" value="${jdbc.url}" />
<!-- 连接数据库的用户名 -->
<property name="username" value="${jdbc.username}" />
<!-- 连接数据库的用户密码 -->
<property name="password" value="${jdbc.password}" />
<!-- 最大连接数-->
<property name="maxTotal" value="${jdbc.maxTotal}" />
<!-- 最大空闲连接数 -->
<property name="maxIdle" value="${jdbc.maxIdle}" />
<!-- 初始化连接数 -->
<property name="initialSize" value="${jdbc.initialSize}" />
</bean>
<!-- 事务管理器，依赖于数据源 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<!-- 开启事务注解 -->
<tx:annotation-driven transaction-manager="transactionManager"/>
<!-- 配置MyBatis工厂 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 注入数据源 -->
<property name="dataSource" ref="dataSource"></property>
<!-- 指定核心配置文件位置 -->
<property name="configLocation" value="classpath:mybatis-config.xml"></property>
</bean>
<bean id="CustomerDao" class="com.itheima.dao.impl.CustomerDaoImpl">
<property name="sqlSessionFactory" ref="sqlSessionFactory"/>
</bean>
</beans><?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>
<properties resource="db.properties"/>
<typeAliases>
<package name="com.itheima.po"/>
</typeAliases>
<mappers>
</mappers>
</configuration>3.此外还需要创建log4j.properties文件
# Global logging configuration
log4j.rootLogger=ERROR, stdout
# MyBatis logging configuration...
log4j.logger.com.itheima=DEBUG
# 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二、基于传统的DAO方式开发整合
1.在src目录下创建com.itheima.po包，并在包中创建持久化类Customer
package com.itheima.po;
public class Customer {
private Integer id;
private String username;
private String jobs;
private String phone;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getJobs() {
return jobs;
}
public void setJobs(String jobs) {
this.jobs = jobs;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
@Override
public String toString() {
return "Customer [id="+id+",username="+username+",jobs="+jobs+",phone="+phone+"]";
}
}
2.在com.itheima.po包中，创建映射文件CustomerMapper.xml在该文件下编写根据id查询的映射语句
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.itheima.po.CustomerMapper">
<select id="findCustomerById" parameterType="Integer" resultType="Customer">
select * from t_customer where id=#{id}
</select>
</mapper>3.在mybatis的配置文件mybatis-config.xml中，配置映射文件Customer.xml的位置，具体如下：
<mapper resource="com/itheima/po/CustomerMapper.xml"/> 4.在src目录下创建一个com.itheima.dao包，并在包中创建接口CustomerDao，在接口中编写一个通过id查询客户的方法findCustomerById（）
package com.itheima.dao;
import com.itheima.po.Customer;
public interface CustomerDao {
public Customer findCustomerById(Integer id);
}
5.在src目录下创建一个com.itheima.dao.impl包，并在包中创建接口CustomerDao的实现类
package com.itheima.dao.impl;
import org.mybatis.spring.support.SqlSessionDaoSupport;
import com.itheima.dao.CustomerDao;
import com.itheima.po.Customer;
public class CustomerDaoImpl extends SqlSessionDaoSupport implements CustomerDao {
@Override
public Customer findCustomerById(Integer id) {
return this.getSqlSession().selectOne("com.itheima.po.CustomerMapper.findCustomerById",id);
}
}
6.在spring的配置文件中，编写实例化CustomerDaoImpl的配置，并将SqlSessionFactory对象注入之中
<bean id="CustomerDao" class="com.itheima.dao.impl.CustomerDaoImpl">
<property name="sqlSessionFactory" ref="sqlSessionFactory"/>
</bean>7、整合测试，在src目录下创建com.itheima.test包，并在包中创建测试类DaoTest类，在类中编写测试方法findCustomerByIdDaoTest（）
package com.itheima.test;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.itheima.dao.CustomerDao;
import com.itheima.po.Customer;
public class DaoTest {
@Test
public void findCustomerByIdTest() {
ApplicationContext act= new ClassPathXmlApplicationContext("applicationContext.xml");
CustomerDao customerDao = act.getBean(CustomerDao.class);
Customer customer = customerDao.findCustomerById(1);
System.out.println(customer);
}
}
8.测试结果如下：
和数据库进行对比
