与Spring3集成
Spring作为基础框架，可以集成后端框架，如Hibernate，MyBatis等。
前面是介绍单独使用MyBatis的，大致逻辑是：
sqlSessionFactory <- configuration file (包括数据库连接配置)
IXxxMapper <- sqlSession <- sqlSessionFactory
<- mapper interface <- mapper xml
得到IxxMapper后，就可以调用其方法进行数据交互了。
和Spring集成时，上面的这些对象需要作为bean来管理：
dataSource bean <- 数据库连接配置
sqlSessionFactory bean <- dataSource
<- configuration file
userMapper bean <- sqlSessionFactory
<- mapper interface
1. 在pom.xml中加入依赖：
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<properties> <mybatis.spring.version>1.2.1</mybatis.spring.version> <dbcp.version>1.4</dbcp.version> <spring.version>3.1.2.RELEASE</spring.version> </properties> <dependencies> <dependency><!-- mybatis的几个对象包装成spring的bean --> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>${mybatis.spring.version}</version> </dependency> <dependency><!-- spring上下文用spring-jdbc连接数据库 --> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>${spring.version}</version> </dependency> <dependency><!-- dataSource是BasicDataSource的实例 --> <groupId>commons-dbcp</groupId> <artifactId>commons-dbcp</artifactId> <version>${dbcp.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>${spring.version}</version> </dependency> </dependencies> |
2. 在类路径下创建beans-da.xml文件：
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<?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"> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"><!-- 数据库连接bean --> <property name="driverClassName" value="com.mysql.jdbc.Driver" /> <property name="url" value="jdbc:mysql://localhost:3306/hbatis?characterEncoding=utf8" /> <property name="username" value="root" /> <property name="password" value="123456" /> </bean> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"><!-- sqlSessionFactory bean --> <property name="dataSource" ref="dataSource" /><!-- 数据源 --> <property name="configLocation" value="classpath:Configuration.xml" /><!-- 配置文件 --> </bean> <bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean"><!-- user映射bean--> <property name="sqlSessionFactory" ref="sqlSessionFactory" /> <property name="mapperInterface" value="com.john.hbatis.mapper.IUserMapper" /><!-- 映射接口 --> </bean> </beans> |
3. 测试类：
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@ContextConfiguration(locations = { "classpath:beans-da.xml" }) public class SpringIntegrationTest extends AbstractTestNGSpringContextTests { private static final Logger log = LoggerFactory.getLogger(SpringIntegrationTest.class); @Resource IUserMapper mapper; @Test public void queryTest() { User user = mapper.getUserById(1); log.info("Name: {}, address: {}", user.getName(), user.getAddress()); } } |
与SpringMVC集成
这里我们建立在与Spring3集成基础上来讲：
1. 往pom.xml添加SpringMVC和Freemarker依赖：
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<properties> <freemarker.version>2.3.19</freemarker.version> <servlet.version>2.5</servlet.version> </properties> <dependency> <groupId>org.freemarker</groupId> <artifactId>freemarker</artifactId> <version>${freemarker.version}</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>${servlet.version}</version> <scope>provided</scope> </dependency> |
2. 在web.xml中加入Spring的监听器和SpringMVC的servlet：
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<listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class><!-- 监听容器事件，初始化和关闭Web应用上下文并调用ContextCleanupListener清理资源 --></listener> <listener> <listener-class>org.springframework.web.context.ContextCleanupListener</listener-class><!-- Web应用关闭时，清理ServletContext中spring相关的可销毁资源 --></listener> <servlet> <servlet-name>hbatis</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <!--<init-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/hbatis-servlet.xml</param-value> </init-param>--><!-- 未配置时，SpringMVC会到WEB-INF目录下找${project.name}-servlet.xml --> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>hbatis</servlet-name> <url-pattern>*.htm</url-pattern> </servlet-mapping> |
3. 在WEB-INF下新建：
Spring配置文件applicationContext.xml：
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<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:p="http://www.springframework.org/schema/p" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <context:property-placeholder location="classpath:/database.properties" /><!-- 数据库配置文件 --> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" p:driverClassName="${driverClassName}" p:url="${url}" p:username="${user_name}" p:password="${password}" /><!-- 数据源配置 --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"><!-- sqlSessionFactory对象 --> <property name="dataSource" ref="dataSource" /><!-- 数据源 --> <property name="configLocation" value="classpath:Configuration.xml" /><!-- myBatis配置文件 --> <!--<property name="mapperLocations" value="classpath*:com/john/hbatis/model/*.xml" />--><!-- 可以在Configuration.xml或此处配置映射文件，但其中不能有相同id的parameterMap, resultMap或sql等 --> </bean> <bean id="mapperConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer"><!-- 扫描指定包以获取映射器 --> <property name="basePackage" value="com.john.hbatis.mapper" /> </bean> </beans> |
类路径下的database.properties：
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driverClassName=com.mysql.jdbc.Driver url=jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf8 user_name=root password=123456 |
注：因为MapperScannerConfigurer可能会导致username取的是系统用户的账号，而造成数据库连接失败，所以改成其它值：user_name。
SpringMVC配置文件hbatis-servlet.xml：
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<?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" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"> <mvc:annotation-driven /><!-- 注册RequestMappingHandlerMapping, RequestMappingHandlerAdapter和ExceptionHandlerExceptionResolver以提供对@RequestMapping,@ExceptionHandler等注解的支持 --> <context:component-scan base-package="com.john.hbatis.controller" /><!-- 扫描控制器包下有特定注解的类，并实例化和依赖注入 --> <!-- FreeMarker视图处理器 --> <bean id="viewResolverFtl" class="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver"> <property name="viewClass" value="org.springframework.web.servlet.view.freemarker.FreeMarkerView"/> <property name="contentType" value="text/html;charset=utf-8"/> <property name="prefix" value="" /> <property name="cache" value="false"/> <property name="viewNames"> <array> <value>*.ftl</value> </array> </property> <!--<property name="suffix" value=".ftl"/>--> <property name="order" value="0"/><!-- 优先级，数值越小优先级越高 --> </bean> <bean id="freemarkerConfig" class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer"> <property name="templateLoaderPaths"> <list> <value>/WEB-INF/ftl/</value><!-- 模板加载路径 --> </list> </property> </bean> </beans> |
4. MVC：
控制层：UserController.java
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@Controller@RequestMapping("/article") public class UserController { @Autowired IUserMapper mapper; @RequestMapping("/list") public String showAll(ModelMap modelMap) { List<Article> articles = mapper.getArticlesByUserId(1); modelMap.addAttribute("articles", articles); return "main.ftl"; } } |
视图层：main.ftl:
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<#list articles as article> <div>${article.id}. ${article.title}: ${article.content}</div> </#list> |
5. 启动工程，浏览器输入：http://localhost:8080/hbatis/article/list.htm查看结果。
