SSM框架整合思想、流程以及配置文件

1.1 建立數據庫

1.2 Mybatis逆向工程

使用mybatis官方提供的mybatis-generator生成pojo、mapper接口及映射文件。

並且將pojo放到對應的pojo工程中，將mapper接口及映射文件放到對應的dao工程中。源碼可以從官方網站中獲取，也可通過https://download.csdn.net/download/qq_18142501/10587658下載。

1.3 整合思路

1.Dao層：

Mybatis的配置文件：

SqlMapConfig.xml：不需要配置任何內容，需要有文件頭。文件必須存在。

applicationContext-dao.xml：mybatis整合spring，通過由spring創建數據庫連接池，spring管理SqlSessionFactory、mapper代理對象。需要mybatis和spring的整合包。

2.Service層：

applicationContext-service.xml：所有的service實現類都放到spring容器中管理。並由spring管理事務。

3.表現層：

Springmvc框架，由springmvc管理controller。Springmvc的三大組件。

1.4 Dao整合

1.4.1 創建SqlMapConfig.xml配置文件

<?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>

</configuration>

1.4.2 Spring整合mybatis

創建applicationcontext-dao.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
	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-4.2.xsd
	http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd
	http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd
	http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.2.xsd">

	<!-- 數據庫連接池 -->
	<!-- 加載配置文件 -->
	<context:property-placeholder location="classpath:conf/db.properties" />
	<!-- 數據庫連接池 -->
	<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
		destroy-method="close">
		<property name="url" value="${jdbc.url}" />
		<property name="username" value="${jdbc.username}" />
		<property name="password" value="${jdbc.password}" />
		<property name="driverClassName" value="${jdbc.driver}" />
		<property name="maxActive" value="10" />
		<property name="minIdle" value="5" />
	</bean>
	<!-- 讓spring管理sqlsessionfactory 使用mybatis和spring整合包中的 -->
	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
		<!-- 數據庫連接池 -->
		<property name="dataSource" ref="dataSource" />
		<!-- 加載mybatis的全局配置文件 -->
		<property name="configLocation" value="classpath:mybatis/SqlMapConfig.xml" />
	</bean>
	<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
		<property name="basePackage" value="cn.e3mall.mapper" />
	</bean>
</beans>

db.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/e3mall?characterEncoding=utf-8
jdbc.username=root
jdbc.password=root

Druid是目前最好的數據庫連接池，在功能、性能、擴展性方面，都超過其他數據庫連接池，包括DBCP、C3P0、BoneCP、Proxool、JBoss DataSource。

Druid已經在阿里巴巴部署了超過600個應用，經過多年多生產環境大規模部署的嚴苛考驗。

1.5 Service 整合

1.5.1 管理Service  創建applicationContext-service.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
	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-4.2.xsd
	http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd
	http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd
	http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.2.xsd">

	<context:component-scan base-package="cn.e3mall.service"/>
</beans>

1.5.2 事務管理 創建applicationContext-trans.xml

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
	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-4.2.xsd
	http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd
	http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd
	http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.2.xsd">
	<!-- 事務管理器 -->
	<bean id="transactionManager"
		class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<!-- 數據源 -->
		<property name="dataSource" ref="dataSource" />
	</bean>
	<!-- 通知 -->
	<tx:advice id="txAdvice" transaction-manager="transactionManager">
		<tx:attributes>
			<!-- 傳播行爲 -->
			<tx:method name="save*" propagation="REQUIRED" />
			<tx:method name="insert*" propagation="REQUIRED" />
			<tx:method name="add*" propagation="REQUIRED" />
			<tx:method name="create*" propagation="REQUIRED" />
			<tx:method name="delete*" propagation="REQUIRED" />
			<tx:method name="update*" propagation="REQUIRED" />
			<tx:method name="find*" propagation="SUPPORTS" read-only="true" />
			<tx:method name="select*" propagation="SUPPORTS" read-only="true" />
			<tx:method name="get*" propagation="SUPPORTS" read-only="true" />
		</tx:attributes>
	</tx:advice>
	<!-- 切面 -->
	<aop:config>
		<aop:advisor advice-ref="txAdvice"
			pointcut="execution(* cn.e3mall.service.*.*(..))" />
	</aop:config>
</beans>

1.6 表現層整合

1.6.1 Springmvc.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:p="http://www.springframework.org/schema/p"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd">
	
	<context:component-scan base-package="cn.e3mall.controller" />
	<mvc:annotation-driven />
	<bean
		class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/WEB-INF/jsp/" />
		<property name="suffix" value=".jsp" />
	</bean>
</beans>

1.6.2 Web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns="http://java.sun.com/xml/ns/javaee"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
	id="WebApp_ID" version="2.5">
	<display-name>e3-manager</display-name>
	<welcome-file-list>
		<welcome-file>index.jsp</welcome-file>
	</welcome-file-list>
	
	<!-- 加載spring容器 -->
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>classpath:spring/applicationContext*.xml</param-value>
	</context-param>
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>
	
<!-- 解決post亂碼 -->
	<filter>
		<filter-name>CharacterEncodingFilter</filter-name>
		<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
		<init-param>
			<param-name>encoding</param-name>
			<param-value>utf-8</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>CharacterEncodingFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>


	<!-- springmvc的前端控制器 -->
	<servlet>
		<servlet-name>e3-manager</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<!-- contextConfigLocation不是必須的， 如果不配置contextConfigLocation， springmvc的配置文件默認在：WEB-INF/servlet的name+"-servlet.xml" -->
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>classpath:spring/springmvc.xml</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>e3-manager</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>
</web-app>

 

整合測試

1.需求

 

根據商品id查詢商品信息，返回json數據。

2.    Dao層

 

由於是單表查詢可以使用逆向工程生成的代碼

3.    Service層

 

參數：商品id

 

返回值：TbItem

 

業務邏輯：根據商品id查詢商品信息。

 

/**

 * 商品管理Service

 * <p>Title: ItemServiceImpl</p>

 * <p>Description: </p>

 * <p>Company: www.itcast.cn</p>

 * @version 1.0

 */

@Service

public class ItemServiceImpl implements ItemService {

     @Autowired

     private TbItemMapper itemMapper;

    

     @Override

     public TbItem getItemById(long id) {

          TbItem item = itemMapper.selectByPrimaryKey(id);

          return item;

     }

}

 

4.    Controller

 

/**

 * 商品管理Controller

 * <p>Title: ItemController</p>

 * <p>Description: </p>

 * <p>Company: www.itcast.cn</p>

 * @version 1.0

 */

@Controller

public class ItemController {

 

     @Autowired

     private ItemService itemService;

    

     @RequestMapping("/item/{itemId}")

     @ResponseBody

     private TbItem getItemById(@PathVariable Long itemId) {

          TbItem tbItem = itemService.getItemById(itemId);

          return tbItem;

     }

}

 

 5.    解決mapper綁定異常

 

原因

 

 

此異常的原因是由於mapper接口編譯後在同一個目錄下沒有找到mapper映射文件而出現的。由於maven工程在默認情況下src/main/java目錄下的mapper文件是不發佈到target目錄下的。

 

解決方法

 

在e3-manager-dao工程的pom文件中添加如下內容：

 

<!-- 如果不添加此節點mybatis的mapper.xml文件都會被漏掉。 -->

     <build>

          <resources>

            <resource>

                <directory>src/main/java</directory>

                <includes>

                    <include>**/*.properties</include>

                    <include>**/*.xml</include>

                </includes>

                <filtering>false</filtering>

            </resource>

        </resources>

     </build>