spring中整合mybatis
一 先添加spring框架
1.创建一个maven项目
2.在pom.xml中添加spring jar包
<!-- Spring --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>4.1.3.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>4.1.3.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>4.1.3.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context-support</artifactId> <version>4.1.3.RELEASE</version> </dependency>
3.创建基本mvc结构
pojo层:
Items类
package com.test.pojo; import java.util.Date; public class Items { private int id; private String name; private float price; private String detail; private String pic; private Date createtime; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public float getPrice() { return price; } public void setPrice(float price) { this.price = price; } public String getDetail() { return detail; } public void setDetail(String detail) { this.detail = detail; } public String getPic() { return pic; } public void setPic(String pic) { this.pic = pic; } public Date getCreatetime() { return createtime; } public void setCreatetime(Date createtime) { this.createtime = createtime; } @Override public String toString() { return "Items{" + "id=" + id + ", name='" + name + '\'' + ", price=" + price + ", detail='" + detail + '\'' + ", pic='" + pic + '\'' + ", createtime=" + createtime + '}'; } }
dao层
接口 IItemsDao
package com.test.dao; import com.test.pojo.Items; import java.util.List; public interface IItemsDao { public List<Items> selectItems(); }
实现类 ItemsDao
package com.test.dao.impl; import com.test.dao.IItemsDao; import com.test.mapper.ItemsMapper; import com.test.pojo.Items; import org.springframework.stereotype.Component; import java.io.InputStream; import java.util.List; public class ItemsDao implements IItemsDao { public ItemsDao() { } public List<Items> selectItems() { return null; } }
service层
接口:IItemsService
package com.test.service; import com.test.pojo.Items; import java.util.List; public interface IItemsService { public List<Items> selectItems(); }
实现类:ItemsService
package com.test.service.impl; import com.test.dao.IItemsDao; import com.test.mapper.ItemsMapper; import com.test.pojo.Items; import com.test.service.IItemsService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import java.util.List; public class ItemsService implements IItemsService { private IItemsDao itemsDao; public List<Items> selectItems() { return itemsDao.selectItems(); } }
4.创建spring的配置文件
applicationContext-ioc.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-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd"> </beans>
5.在配置文件中添加注解扫描包
<?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-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd"> <!-- 设置注解 扫描 的包 --> <context:component-scan base-package="com.test" /> </beans>
- 在mvc各层中添加注解
package com.test.dao.impl; import com.test.dao.IItemsDao; import com.test.mapper.ItemsMapper; import com.test.pojo.Items; import org.springframework.stereotype.Component; import java.io.InputStream; import java.util.List; @Component public class ItemsDao implements IItemsDao { public ItemsDao() { } public List<Items> selectItems() { return null; } } @Service public class ItemsService implements IItemsService { @Autowired private IItemsDao itemsDao; public List<Items> selectItems() { return itemsDao.selectItems(); } }
二.在spring中引入mybatis
1.导入mybatis jar包
<!-- 导入mybatis需要的jar包 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.37</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.4.6</version> </dependency> <dependency> <groupId>com.mchange</groupId> <artifactId>c3p0</artifactId> <version>0.9.5.2</version> </dependency> <!-- 配置日志信息--> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency>
2.导入spring整合mybatis架包
<!-- spring 整合 mybatis--> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.3.0</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>4.1.3.RELEASE</version> </dependency>
3.创建mapper文件
<?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.test.mapper.ItemsMapper"> <select id="selectItems" resultType="Items"> select * from items; </select> </mapper>
4.创建mapper文件的代理接口
package com.test.mapper; import com.test.pojo.Items; import java.util.List; public interface ItemsMapper { public List<Items> selectItems(); }
5.创建mybatis配置文件
mybatis.xml文件
<?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> <!-- 设置日志的输出方法 --> <settings> <setting name="logImpl" value="STDOUT_LOGGING" /> </settings> <!-- 给pojo下面的类设置别名--> <typeAliases> <package name="com.test.pojo"/> </typeAliases> <mappers> <mapper resource="com/test/mapper/ItemsMapper.xml"/> </mappers> </configuration>
6. 创建db.properties文件
jdbc.driver=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/ssm?characterEncoding=utf-8 jdbc.username=root jdbc.password=123
7. 修改applicationContext-ioc.xml文件
将之前在mybatis文件中配置的数据源 交给spring来管理,并创建sqlSessionFactory对象
<?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-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd"> <!-- 设置注解 扫描 的包 --> <context:component-scan base-package="com.test" /> <!-- 导入db.properties文件 --> <context:property-placeholder location="classpath:db.properties"></context:property-placeholder> <!-- 创建一个连接池对象 --> <bean id="comboPooledDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="driverClass" value="${jdbc.driver}" /> <property name="jdbcUrl" value="${jdbc.url}"/> <property name="user" value="${jdbc.username}" /> <property name="password" value="${jdbc.password}" /> </bean> <!-- 创建sqlSessionfactory对象--> <bean id="sqlSessionfactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="comboPooledDataSource"/> <property name="configLocation" value="classpath:mybatis.xml"/> </bean> </beans>
8.修改dao层
package com.test.dao.impl; import com.test.dao.IItemsDao; import com.test.mapper.ItemsMapper; import com.test.pojo.Items; import org.apache.ibatis.session.SqlSession; import org.apache.ibatis.session.SqlSessionFactory; import org.apache.ibatis.session.SqlSessionFactoryBuilder; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Component; import java.io.InputStream; import java.util.List; @Component public class ItemsDao implements IItemsDao { @Autowired private SqlSessionFactory sqlSessionFactory; public ItemsDao() { } public List<Items> selectItems() { SqlSession sqlSession= sqlSessionFactory.openSession(); ItemsMapper itemsMapper= sqlSession.getMapper(ItemsMapper.class); List<Items> itemsList= itemsMapper.selectItems(); return itemsList; } }
9.在pom.xml文件中添加mapper.xml文件的路径
在build标签中添加
<resources> <resource> <!-- 将Mapper的映射文件拷贝出来 --> <directory>src/main/java</directory> <includes> <include>**/*.xml</include> </includes> <filtering>true</filtering> </resource> </resources>
10.测试
@Test public void fun() { ClassPathXmlApplicationContext classPathXmlApplicationContext=new ClassPathXmlApplicationContext("/applicationContext-ioc.xml"); IItemsService itemsService= classPathXmlApplicationContext.getBean("itemsService",IItemsService.class); System.out.println(itemsService.selectItems()); }
三 给mapper接口创建代理,替代原dao层的功能
1.在applicationContext-ioc.xml文件中 添加
<!-- 配置映射文件的扫描器 --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.test.mapper"/> </bean>
- 修改service代码
将之前的
@Autowired
private IItemsDao itemsDao;
修改为
@Autowired
private ItemsMapper itemsMapper;
完整代码如下
package com.test.service.impl; import com.test.dao.IItemsDao; import com.test.mapper.ItemsMapper; import com.test.pojo.Items; import com.test.service.IItemsService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Component; import org.springframework.stereotype.Service; import java.util.List; @Service public class ItemsService implements IItemsService { @Autowired private ItemsMapper itemsMapper; public List<Items> selectItems() { return itemsMapper.selectItems(); }
}
- 原来的dao层可以删除
- 测试代码不变