Spring框架学习day4--Spring集成Mybatis（IOC)

Spring集成Mybatis

Spring集成Mybatis其核心是将SqlSessionFactory交由Spring管理，并由 Spring管理对dao接口的代理实现。 导入mybatisjar包

创建新的ssm项目为例文件结构如下

1.添加jar包（pom.xml）

<?xml version="1.0" encoding="UTF-8"?>
<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>org.example</groupId>
    <artifactId>ssm</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.2.2.RELEASE</version>
        </dependency>
    <!-- spring-jdbc-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.2.RELEASE</version>
        </dependency>
        <!-- 阿里数据源-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.10</version>
        </dependency>
        <!--        mysql驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.16</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.2</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.1</version>
        </dependency>
    </dependencies>
</project>

2.配置sqlSessionFactiory（spring.xml)

<!--    spring管理生成SqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <property name="configLocation" value="classpath:mybatis.xml"></property>
<!--        指定配置文件-->
        <property name="mapperLocations" value="classpath:mappers/*Mapper.xml">
<!--            指定文件地址-->
        </property>
    </bean>

生成接口代理(spring.xml)

<!--    spring管理生成接口代理对象-->
    <bean id="mapperFactory" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="org.example.dao"></property>
<!--        对指定包下的接口进行扫描，并生成接口代理的对象-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory">
        </property>
    </bean>

完整spring.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:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
">
    <!--        开启注解扫描  对指定包下的注解进行扫描 ，检查添加spring类注解标签的类-->
    <context:component-scan base-package="org.example" ></context:component-scan>
    <context:property-placeholder location="config.properties"/>
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <!--       方法一：通过配置文件配置数据源-->
        <!--                <property name="driverClassName" value="com.mysql.jdbc.cj.Driver"/>-->
        <!--        <property name="url" value="数据库连接/>-->
        <!--        <property name="username" value="root"/>-->
        <!--        <property name="password" value="root"/>-->
        <!--        <property name="initialSize" value="1"/>-->
        <!--        <property name="maxActive" value="1"/>-->
        <!-- 方法二：通过注解配置数据源-->
        <property name="driverClassName" value="${driverClassName}"/>
        <property name="url" value="${url}"/>
        <property name="username" value="${username}"/>
        <property name="password" value="${password}"/>
        <property name="initialSize" value="${initialSize}"/>
        <property name="maxActive" value="${maxActive}"/>
    </bean>
<!--    spring管理生成SqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <property name="configLocation" value="classpath:mybatis.xml"></property>
<!--        指定配置文件-->
        <property name="mapperLocations" value="classpath:mappers/*Mapper.xml">
<!--            指定文件地址-->
        </property>
    </bean>
<!--    spring管理生成接口代理对象-->
    <bean id="mapperFactory" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="org.example.dao"></property>
<!--        对指定包下的接口进行扫描，并生成接口代理的对象-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory">
        </property>
    </bean>
</beans>

注：对应的mybatis.xml文件有所变化

<?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>
    <settings>
        <!--        打印日志-->
        <setting name="logImpl" value="STDOUT_LOGGING"/>
        <!--            开启驼峰命名规则-->
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>
    <!--    为类配置起别名-->
    <typeAliases>
        <!--        下面别名怎么引用呢？  直接在xml文件中使用别名就可以了-->
        <typeAlias type="org.example.model.Admin" alias="Admin"/>
    </typeAliases>
</configuration>

3.再service类中注入Dao代理接口

@Service("loginService")
public class LoginService {
    @Autowired
    LoginDao loginDao;

   public Admin login(Admin admin){
        return loginDao.login(admin);
    }
}

4.测试类

package org.example.test;

import org.example.model.Admin;
import org.example.service.LoginService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class test {
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");
        Admin admin = context.getBean("admin", Admin.class);
        admin.setAccount("admin");
        admin.setPassword("111");
        LoginService loginService = context.getBean("loginService", LoginService.class);
        Admin result = loginService.login(admin);
        System.out.println(result);

    }
}

5文件结构