SSM整合过程（一）

于 2019-06-24 10:22:33 发布
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本文链接：https://blog.youkuaiyun.com/qq_33646685/article/details/93463303
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技术：Spring SpringMVC Mybatis
数据库：mysql

首先创建maven工程，导入依赖，导入静态资源

步骤一（Mybatis独立测试）

1.创建pojo(User.java)，mapper（接口UserMapper.java）

public interface UserMapper {
    User queryUserById(@Param("id")Long id);
}

2.全局配置文件(mybatis-config.xml)，对应的映射文件(UserMapper.xml)

<!--mybatis-config.xml -->
<?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>
    <!-- 引入外部资源文件 resource:默认引入classpath路径下的资源文件 -->
    <properties resource="jdbc.properties"></properties>
    <settings>
        <!-- 设置驼峰参数 -->
        <setting name="mapUnderscoreToCamelCase" value="true" />
    </settings>

    <!-- 配置别名 -->
    <typeAliases>
        <!-- 配置包扫描：解决多个pojo别名问题，默认将类名作为笔名，大小写不敏感 -->
        <package name="cn.itcast.pojo"/>
    </typeAliases>


    <!-- 配置环境：可以配置多个环境，default：配置某一个环境的唯一标识，表示默认使用哪个环境 -->
    <environments default="development">
        <!-- 配置环境,id:环境的唯一标识 -->
        <environment id="development">
            <!-- 事务管理器，type:使用jdbc的事务管理器 -->
            <transactionManager type="JDBC" />
            <!-- 数据源，type:池类型的数据源 -->
            <dataSource type="POOLED">
                <!-- 配置连接信息 -->
                <property name="driver" value="${jdbc.driverClass}" />
                <property name="url" value="${jdbc.url}" />
                <property name="username" value="${jdbc.username}" />
                <property name="password" value="${jdbc.password}" />
            </dataSource>
        </environment>
    </environments>
    <!-- 配置映射文件：用来配置sql语句和结果集类型等 -->
    <mappers>
        <mapper resource="mybatis/mappers/UserMapper.xml"/>
    </mappers>
</configuration>

<!-- UserMapper.xml -->
<?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="cn.itcast.mapper.UserMapper">
    <select id="queryUserById" resultType="User">
        select * from tb_user where id = #{id}
    </select>
</mapper>

3.测试

public class UserMapperTest {

    @Test
    public void queryUserById() throws IOException {
        String resource = "mybatis/mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        SqlSession sqlSession = sqlSessionFactory.openSession(true);
        UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
        User user = userMapper.queryUserById(1l);
        System.out.println(user);
    }
}

步骤二：Spring和mybatis整合

就是将sqlSessionFactory交给Spring管理，Mybatis和spring的整合包提供了一个SqlsessionFactory类。（用Spring的IOC容器管理其他框架的API）
1.创建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:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       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/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd">

    <!-- (3)加载资源文件 -->
    <context:property-placeholder location="classpath:jdbc.properties"/>

    <!-- (1)装配sqlSessionFactory -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 注入mybatis的核心配置文件 -->
        <property name="configLocation" value="classpath:mybatis/mybatis-config.xml"></property>
        <!-- 注入mybatis的数据源 -->
        <property name="dataSource" ref="dataSource"></property>
        <!-- 配置别名扫描 -->
        <property name="typeAliasesPackage" value="cn.itcast.pojo"></property>
        <!-- 配置映射文件管理：mybatis/mappers目录下的所有的映射文件 -->
        <property name="mapperLocations" value="classpath:mybatis/mappers/**/*.xml"></property>
    </bean>

    <!-- (2)装配数据源 -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driverClass}"></property>
        <property name="url" value="${jdbc.url}"></property>
        <property name="username" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>
    
    <!--(4)装配单个Mapper-->
    <bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
        <property name="mapperInterface" value="cn.itcast.mapper.UserMapper"></property>
        <property name="sqlSessionFactory" ref="sqlSessionFactory"></property>
    </bean>

    
</beans>

2.修改mybatis-config.xml
mybatis-config.xml和applicationContext.xml中的dataSource重复了，此时删除mybatis-config.xml中的dataSource（装配数据源），加载资源文件也不需要了,别名扫描，配置映射文件也不需要了


<?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>
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>
</configuration>

3.测试

public class UserMapper2Test {
    @Test
    public void queryUserById() throws IOException {
    /*ApplicationContext ac = new ClassPathXmlApplicationContext("spring/applicationContext.xml");
	  SqlSessionFactory sqlSessionFactory = (SqlSessionFactory) ac.getBean("sqlSessionFactory");
	  SqlSession sqlSession = sqlSessionFactory.openSession(true);
	  UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
	  User user = userMapper.queryUserById(1l);
	  System.out.println(user);*/
      ApplicationContext ac = new ClassPathXmlApplicationContext("spring/applicationContext.xml");
      UserMapper userMapper = (UserMapper) ac.getBean("userMapper");
      User user = userMapper.queryUserById(1l);
      System.out.println(user);

    }
}

步骤三：springmvc的整合

1.配置web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">

    <!--（1） 编码过滤器，以UTF8编码 -->
    <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>
    </filter>
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!--（2）Spring的监听器 -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring/applicationContext.xml</param-value>
    </context-param>


    <!--（3） 配置SpringMVC -->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring/springmvc-servlet.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <!--拦截所有的请求，jsp除外 -->
        <url-pattern>/</url-pattern>
    </servlet-mapping>

2.编写controller

@Controller
@RequestMapping("user")
public class UserController {
    @RequestMapping("users")
    public String toUsers(){
        return "users";
    }
}

3.配置springmvc-servlet.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"
       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/mvc 
        http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context.xsd">

    <!-- 开启注解扫描 -->
    <context:component-scan base-package="cn.itcast.controller"></context:component-scan>


    <!--配置注解驱动-->
    <mvc:annotation-driven></mvc:annotation-driven>

    <!--配置视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/views/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>
</beans>

步骤四：配置事务

修改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:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:aop="http://www.springframework.org/schema/aop"
       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/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd">

    <!--配置注解扫描-->
    <context:component-scan base-package="cn.itcast.service"></context:component-scan>

    <!--加载外部资源文件-->
    <context:property-placeholder location="classpath:jdbc.properties"></context:property-placeholder>

    <!--装配SqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 注入mybatis的核心配置文件 -->
        <property name="configLocation" value="classpath:mybatis/mybatis-config.xml"></property>
        <!-- 注入mybatis的数据源 -->
        <property name="dataSource" ref="dataSource"></property>
        <!-- 配置别名扫描 -->
        <property name="typeAliasesPackage" value="cn.itcast.pojo"></property>
        <!-- 配置映射文件管理 -->
        <property name="mapperLocations" value="classpath:mybatis/mappers/**/*.xml"></property>

    </bean>

    <!--装配数据源-->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driverClass}"></property>
        <property name="url" value="${jdbc.url}"></property>
        <property name="username" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>

    <!--装配多个Mapper-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="cn.itcast.mapper"></property>
    </bean>

    <!--装配事务管理器-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!--配置事务策略-->
    <tx:advice id="txAdvice">
        <tx:attributes>
            <tx:method name="*"/>
        </tx:attributes>
    </tx:advice>

    <!--配置AOP-->
    <aop:config>
        <aop:pointcut id="pt1" expression="execution(* cn.itcast.service.impl.*.*(..))"></aop:pointcut>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="pt1"></aop:advisor>
    </aop:config>

步骤五：使用注解方式的事务

注意：使用注解事务前，先将applicationContext-tx.xml中的xml事务配置注释掉。
在applicationContext.xml中开启注解事务

tx:annotation-driven</tx:annotation-driven>
在类上使用注解:
在这里插入图片描述

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