Spring ApplicationContext.xml 配置文件常用注解和详解

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"
       xsi:schemaLocation="http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
        <context:annotation-config />
        <context:component-scan base-package="com.azimiao.tmall.service" />

        <!-- 导入数据库配置文件 -->
        <context:property-placeholder location="classpath:jdbc.properties" />

        <!--配置数据库连接池> -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="clone">
        <!--基本属性 url、user、password-->
        <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="1"/>
        <property name="minIdle" value="1"/>
        <property name="maxActive" value="20"/>

        <!--配置获取连接等待超时的时间 -->
        <property name="maxWait" value="30000"/>

        <!--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="minEvictableIdleTimeMillis" value="300000"/>

        <property name="validationQuery" value="SELECT 1"/>
        <property name="testWhileIdle" value="true" />
        <property name="testOnBorrow" value="false"/>
        <property name="testOnReturn" value="false"/>

        <!--打开PSCache,并且置顶每个连接上的PSCache的大小 -->
        <property name="poolPreparedStatements" value="true"/>
        <property name="maxPoolPreparedStatementPerConnectionSize" value="20"/>
    </bean>

    <!--Mybatis的SessionFactory配置 -->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="typeAliasesPackage" value="com.azimiao.tmall.pojo"/>
        <property name="dataSource" ref="dataSource"/>
        <property name="mapperLocations" value="classpath:mapper/*.xml"/>
        <!--分页插件，目前先注释，后面重构的时候才会使用
        <property name="plugins">
            <array>
                <bean class="com.github.pagehelper.PageInterceptor">
                    <property name="properties">
                        <value>
                        </value>
                    </property>
                </bean>
            </array>
        </property>
        -->
    </bean>

    <!--Mybatis的Mapper文件识别 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.azimiao.tmall.mapper"/>
    </bean>

</beans>

1.

<context:component-scan base-package="com.azimiao.tmall.service" />

 Spring容器在初始化的时候，会扫描com.azimiao.tmall.service下标有@注解的类纳入Spring容器管理

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常用的注解

@Service  表示声明当前类是一个service类

@RequestMapping(value="/") 请求映射，访问地址的后缀

@Autowired 自动装配

@Controller 声明为控制类