mybatis实战教程三：mybatis和springmvc整合

一、搭建maven环境，引入相关jar

参考demo

二、写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"
         xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
         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>Archetype Created Web Application</display-name>
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
    <filter>
        <filter-name>encodingFilter</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>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath*:applicationContext.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <listener>
        <listener-class>org.springframework.web.context.ContextCleanupListener</listener-class>
    </listener>
    <servlet>
        <servlet-name>mvc-dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>mvc-dispatcher</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

三、写springmvc的xml文件mvc-dispatcher-servlet.xml

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       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-3.0.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-3.0.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
    <context:component-scan base-package="com.yihaomen.mybatis" />
    <mvc:annotation-driven />
    <mvc:resources mapping="/static/**" location="/WEB-INF/static/" />
    <mvc:default-servlet-handler/>

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix">
            <value>/WEB-INF/pages/</value>
        </property>
        <property name="suffix">
            <value>.jsp</value>
        </property>
    </bean>
</beans>

四、写spring的配置文件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"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:p="http://www.springframework.org/schema/p"
       xsi:schemaLocation="
            http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
            http://www.springframework.org/schema/aop
            http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
            http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context-3.0.xsd
            http://www.springframework.org/schema/jee
            http://www.springframework.org/schema/jee/spring-jee-3.0.xsd
            http://www.springframework.org/schema/tx
            http://www.springframework.org/schema/tx/spring-tx-3.0.xsd"
       default-autowire="byName" default-lazy-init="false">
    <bean id="propertyConfigurer"
          class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location" value="classpath:jdbc.properties" />
    </bean>
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        <!-- 配置初始化大小、最小、最大 -->
        <property name="initialSize" value="10" />
        <property name="minIdle" value="10" />
        <property name="maxActive" value="20" />
        <!-- 配置获取连接等待超时的时间 -->
        <property name="maxWait" value="60000" />
        <!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 -->
        <property name="timeBetweenEvictionRunsMillis" value="60000" />
        <!-- 配置一个连接在池中最小生存的时间，单位是毫秒 -->
        <property name="minEvictableIdleTimeMillis" value="300000" />
        <property name="validationQuery" value="SELECT 'x'" />
        <property name="testWhileIdle" value="true" />
        <property name="testOnBorrow" value="false" />
        <property name="testOnReturn" value="false" />
        <!-- 打开PSCache，并且指定每个连接上PSCache的大小 -->
        <property name="poolPreparedStatements" value="true" />
        <property name="maxPoolPreparedStatementPerConnectionSize" value="20" />
        <!-- 配置监控统计拦截的filters，去掉后监控界面sql无法统计 -->
        <property name="filters" value="stat" />
    </bean>
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>

　　<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    　　<property name="basePackage" value="com.yihaomen.mybatis.dao"></property>
    　　<property name="sqlSessionFactoryBeanName" value="demoSqlSessionFactory"></property>
　　</bean>

<bean id="demoSqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <!--dataSource属性指定要用到的连接池--> <property name="dataSource" ref="dataSource"/> <!--configLocation属性指定mybatis的核心配置文件--> <property name="configLocation" value="classpath:mybatis-config.xml"/> <property name="mapperLocations" value="classpath:com/yihaomen/mybatis/model/*.xml"/> </bean> </beans>

五、mybatis-config.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>
    <settings>
        <!--这个配置使全局的映射器启用或禁用缓存-->
        <setting name="cacheEnabled" value="true"/>
        <!--
           允许jdbc支持生成的键。需要适合的驱动。如果设置为true，
           则这个设置强制生成的键被使用，尽管一些驱动拒绝兼容但
           仍然有效
        -->
        <setting name="useGeneratedKeys" value="true"/>
        <!--配置默认的执行器。SIMPLE执行器没有什么特别之初。
        REUSE执行器重用预处理语句。BATCH执行器重用语句和批量更新-->
        <setting name="defaultExecutorType" value="REUSE"/>
        <!--设置超时时间，它决定驱动等待一个数据库相应时间-->
        <setting name="defaultStatementTimeout" value="25000"/>
    </settings>
    <!--配置别名-->
    <typeAliases>
        <typeAlias alias="Student" type="com.yihaomen.mybatis.model.Student"/>
    </typeAliases>
    <!--指定映射器路径-->
    <mappers>
        <mapper resource="com\yihaomen\mybatis\model\Student.xml"/>
    </mappers>
</configuration>

六、jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://127.0.0.1:3306/mybatis-learn?characterEncoding=utf8
jdbc.username=root
jdbc.password=tiger

maxActive= 50

七、DAO层

/**
 * 这里的@MapperScan就是上面所讲的Mapper扫描器中所需要的配置，会自动生成代理对象。
 * 注意，接口中的方法名称要和对应的MyBatis映射文件中的语句的id值一样，因为生成的
 * 动态代理，会根据这个匹配相应的Sql语句执行。另外就是方法的参数和返回值也需要注
 * 意。接口中的方法如何定义，对应的MyBatis映射文件就应该进行相应的定义。
 * 最后，标注中的userDao是用来作为Spring的Bean的id(或name)进行使用的，方便我
 * 们在Service层进行注入使用。
 */
@MapperScan
public interface ArticleMapper {
    public List<Article> getUserArticles(int userId);
}

八、service层

public interface ArticleService {
    public List<Article> getArticles();
}

@Service
public class ArticleServiceImpl implements ArticleService {
    @Autowired
    private ArticleMapper articleMapper;
    public List<Article> getArticles() {
        return articleMapper.getUserArticles(1);
    }
}

九、Controller层

@Controller
@RequestMapping("/user")
public class UserController {
    @Autowired
    private ArticleService articleService;
    @RequestMapping("/list")
    public ModelAndView userListAll(HttpServletRequest request, HttpServletResponse response) {
        List<Article> articleList = articleService.getArticles();
        ModelAndView mv = new ModelAndView("list");
        mv.addObject("articles", articleList);
        return mv;
    }
}

https://gitee.com/huayicompany/springmvc-mybatis

参考：

[1] 《mybati实战教程》