（一）整合环境搭建
1.准备所需要的jar包如以下图所示
（二）Mybatis与Spring整合方式一：使用传统DAO方式整合
项目结构：
实现Mybatis与Spring整合的具体步骤如下：
1.编写配置文件
db.properties配置如下：
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis
jdbc.username=root
jdbc.password=root
jdbc.maxTotal=30
jdbc.maxIdle=10
jdbc.initialSize=5
log4j.properties配置如下：
# 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%napplicationContext.xml配置如下：
<?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db.properties -->
<context:property-placeholder location="classpath:db.properties"/>
<!-- 开启扫描用于注解方式-->
<!-- <context:component-scan base-package="com.itheima.service" />-->
<!-- 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="${jdbc.maxTotal}" />
<!--最大空闲连接 -->
<property name="maxIdle" value="${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" />
<!--指定核心配置文件位置 -->
<property name="configLocation" value="classpath:mybatis-config.xml"/>
</bean>
<!--实例化CustomerDaoImp -->
<bean id="customerDao" class="com.wang.Dao.CustomerDaoImp">
<!-- 注入SqlSessionFactory对象实例-->
<property name="sqlSessionFactory" ref="sqlSessionFactory" />
</bean>
<!--实例化CustomerService -->
<bean id="customerService" class="com.wang.service.CustomerService">
<property name="customerdao" ref="customerDao"/>
</bean>
</beans>
mybatis-config.xml配置如下：
<?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>
<!--配置别名 -->
<typeAliases>
<package name="com.wang.po" />
</typeAliases>
<!--配置Mapper的位置 -->
<mappers>
<mapper resource="com/wang/mapper/CustomerMapper.xml" />
</mappers>
</configuration>
2.在com.wang.po包下创建Customer.java
package com.wang.po;
//用于封装查询数据
public class Customer {
private int id;
private String username;
private String jobs;
private String phone;
---省略setter和getter方法---
@Override
public String toString() {
return "Customer [id=" + id + ", username=" + username + ",
jobs=" + jobs + ", phone=" + phone + "]";
}
}
3.在com.wang.mapper包下创建CustomerMapper.xml用于配置SQL
<?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.wang.mapper.CustomerMapper">
<select id="findCustomerById" parameterType="Integer"
resultType="customer">
select*from t_customer where id=#{id}
</select>
</mapper>4.在com.wang.Dao包下创建CustomerDao.java和CustomerDaoImp.java
CustomerDao.java
package com.wang.Dao;
import com.wang.po.Customer;
public interface CustomerDao {
//实现按id查询
public Customer findCustomerById(Integer id);
}
CustomerDaoImp.java
package com.wang.Dao;
import org.mybatis.spring.support.SqlSessionDaoSupport;
import com.wang.po.Customer;
//实现SqlSessionDaoSupport接口，配置Bean时需要setter设值sqlSessionFactory
public class CustomerDaoImp extends SqlSessionDaoSupport
implements CustomerDao {
//实现按id查询
public Customer findCustomerById(Integer id) {
return this.getSqlSession().selectOne("com.wang.mapper"
+ ".CustomerMapper.findCustomerById", 1);
}
}
5.在com.wang.service包下创建CustomerService.java
package com.wang.service;
import com.wang.Dao.CustomerDao;
import com.wang.po.Customer;
public class CustomerService {
private CustomerDao customerdao;
// setter设值注入
public void setCustomerdao(CustomerDao customerdao) {
this.customerdao = customerdao;
}
public Customer findCustomerById(Integer id) {
return this.customerdao.findCustomerById(id);
}
}
6.在com.wang.MybatisTest包下创建MybatisTest.java测试
package com.wang.MybatisTest;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.wang.po.Customer;
import com.wang.service.CustomerService;
public class MybatisTest {
@Test
public void findCustomerById() {
@SuppressWarnings("resource")
ApplicationContext con=
new ClassPathXmlApplicationContext("applicationContext.xml");
CustomerService customerService=(CustomerService)
con.getBean("customerService");
Customer customer=customerService.findCustomerById(1);
System.out.println(customer);
}
}
7.结果输出
Customer [id=1, username=张三, jobs=学生, phone=183999999]