整合数据库连接池dbcp

1.导入jar包

<dependency>
    <groupId>commons-dbcp</groupId>
    <artifactId>commons-dbcp</artifactId>
    <version>1.4</version>
</dependency>

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.38</version>
</dependency>

2.修改beans.xml头文件

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"       
       mlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans      
       http://www.springframework.org/schema/beans/spring-beans.xsd      
       http://www.springframework.org/schema/aop     
       http://www.springframework.org/schema/aop/spring-aop.xsd     
       http://www.springframework.org/schema/context     
       http://www.springframework.org/schema/context/spring-context.xsd">    
       <!--开启注解-->    
       <context:annotation-config></context:annotation-config>    
       <context:component-scan base-package="com.xszx"></context:component-scan>    
       <aop:aspectj-autoproxy></aop:aspectj-autoproxy>

3.配置数据源beans.xml

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">    
    <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>    
    <property name="url" value="jdbc:mysql://localhost:3306/test"></property>    
    <property name="username" value="root"></property>    
    <property name="password" value="root"></property>
</bean>

整合mybatis

1.删除所有dao层的实现层

2.导入包（使用maven进行管理）

<!--mybaits核心包-->
<dependency>
  <groupId>org.mybatis</groupId>
  <artifactId>mybatis</artifactId>
  <version>3.5.5</version>
</dependency>

<!--日志:记录应用程序所有的执行过程-->
<dependency>
  <groupId>log4j</groupId>
  <artifactId>log4j</artifactId>
  <version>1.2.17</version>
</dependency>

<!--整合mybatis与spring需要的jar包-->
<dependency>
  <groupId>org.mybatis</groupId>
  <artifactId>mybatis-spring</artifactId>
  <version>1.3.1</version>
</dependency>
<!--整合spring 内置数据源-->
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-jdbc</artifactId>
  <version>5.0.2.RELEASE</version>
</dependency>

3.配置mybatis-config.xml

<?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>
    <!--配置日志输出-->
    <settings>
        <setting name="logImpl" value="LOG4J"/>
    </settings>
    <!--配置mybatis的映射文件-->
    <mappers>
        <mapper resource="dao/UserMapper.xml"></mapper>
<!--        注解配置下方语句-->
<!--        <mapper class="com.xszx.dao.UserMapper"></mapper>-->
    </mappers>
</configuration>

4. beans.xml

<?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:context="http://www.springframework.org/schema/context"
        xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-3.0.xsd
        ">
<!--    开启注解驱动-->
    <context:annotation-config/>
<!--    开启组件扫描-->
    <context:component-scan base-package="com.xszx"></context:component-scan>
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://localhost:3306/test"></property>
        <property name="username" value="root"></property>
        <property name="password" value="123456"></property>
    </bean>
    <!--创建sqlSessionFactory对象-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--注入数据源对象-->
        <property name="dataSource" ref="dataSource"></property>
        <property name="configLocation" value="classpath:mybatis-config.xml"></property>
    </bean>
    <!--创建sqlSessionTemplate对象-->
    <bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
        <constructor-arg name="sqlSessionFactory" ref="sqlSessionFactory"></constructor-arg>
    </bean>
</beans>

5.业务层（注入SqlSessionTemplate）

@Service
public class UserServiceImpl implements UserService {
    private SqlSessionTemplate sqlSessionTemplate;
@Autowired
    public void setSqlSessionTemplate(SqlSessionTemplate sqlSessionTemplate) {
        this.sqlSessionTemplate = sqlSessionTemplate;
    }
    @Override
    public void adduser(User user) {
        UserDao userDao = sqlSessionTemplate.getMapper(UserDao.class);
        userDao.adduser(user);
    }
}

6.测试

public class UserTest {
    public static void main(String[] args){
        BeanFactory beanFactory = new ClassPathXmlApplicationContext("beans.xml");
        UserController userController = (UserController) beanFactory.getBean("userController");
        userController.adduser();
    }
}

至此整合技术结束，若有任何疑问欢迎大家在评论区讨论或者后台私信我!!!

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