6.Mabatis整合Spring

使用 Spring 簡化 MyBatis

1. 導 入mybatis所有jar和spring基本包,spring-jdbc,spring-tx,spring-aop,spring-web,spring 整合 mybatis 的包(mybaits-spring)等
   

2. 先配置 web.xml

<?xml version="1.0" encoding="UTF-8"?> 
<web-app version="3.0" 
         xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
                             http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
	<!-- 上下文參數 -->
	<context-param> 
 	   <param-name>contextConfigLocation</param-name>
			<!-- spring 配置文件 -->
	    <param-value>classpath:applicationContext.xml</param-value> 
	</context-param>

	<!-- 封裝了一個監聽器,幫助加載 Spring 的配置文件 --> 
	<listener>
 	   <listener-class>
 	       org.springframework.web.context.Con textLoaderListener
 	   </listener-class> 
	</listener>
</web-app>

3. 編寫 spring 配置文件 applicationContext.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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                           http://www.springframework.org/schema/beans/spring-beans.xsd">
	
    <!-- 數據源封裝類 .數據源:獲取數據庫連 接,spring-jdbc.jar 中--> 
    <bean id="dataSouce" 
          class="org.springframework.jdbc.datasource.DriverMana gerDataSource"> 
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://localhost:3306/ssm"></property>
        <property name="username" value="root"></property> 
        <property name="password" value="smallming"></property> 
    </bean>
    
	<!-- 創建 SqlSessionFactory 對象 --> 
    <bean id="factory" class="org.mybatis.spring.SqlSessionFactoryBean">
		<!-- 數據庫連接信息來源於 dataSource --> 
        <property name="dataSource" ref="dataSouce"></property> 
    </bean>
    
	<!-- 掃描器相當於mybatis.xml中mappers下package標籤,掃描mapper包後會給對應接口創建對象--> 
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigu rer">
		<!-- 要掃描哪個包 --> 
        <property name="basePackage" value="com.bjsxt.mapper"></property>
		<!-- 和 factory 產生關係 --> 
        <property name="sqlSessionFactory" ref="factory"></property> 
    </bean>
    
	<!-- 由 spring 管理 service 實現類 --> 
    <bean id="airportService" class="com.bjsxt.service.impl.AirportServiceImpl">
        <property name="airportMapper" ref="airportMapper"></property>
    </bean> 
</beans>

4. 編寫代碼
   1. 正常編寫 pojo
   2. 編寫 mapper 包下時必須使用接口綁定方案或註解方案(必須有接口)
   3. 正常編寫 Service 接口和 Service 實現類
      • 需要在 Service 實現類中聲明 Mapper 接口對象,並生成get/set 方法
   4. spring 無法管理 Servlet,在 service 中取出 Servie 對象

@WebServlet("/airport") 
public class AirportServlet extends HttpServlet{ 
    private AirportService airportService;
    
    @Override 
    public void init() throws ServletException {
    //對 service 實例化 
    // ApplicationContext ac = 
    // new ClassPathXmlApplicationContext("applicationContext.xml");
	//spring 和 web 整合後所有信息都存放在 webApplicationContext
		ApplicationContext ac = 
    WebApplicationContextUtils.getRequiredWebApplicationC ontext(getServletContext());

		airportService=ac.getBean("airportService",AirportS erviceImpl.class); 
    } 
    @Override 
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { 
        req.setAttribute("list", airportService.show());
        req.getRequestDispatcher("index.jsp").forward(req, resp); 
    } 
}

));
req.getRequestDispatcher(“index.jsp”).forward(req, resp);
}
}