使用Spring注解开发项目

ApplicationContext.xml配置

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns="http://www.springframework.org/schema/beans" 
        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-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 ">
    <!-- 读取db.properties文件 -->
    <context:property-placeholder location="classpath:db.properties" />
    <!-- 开启扫描类中的注解 -->
    <context:component-scan base-package="cn.itcast"></context:component-scan>
    <!-- 配置c3p0连接池 -->
    <bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" >
        <property name="jdbcUrl" value="${jdbc.jdbcUrl}" ></property>
        <property name="driverClass" value="${jdbc.driverClass}" ></property>
        <property name="user" value="${jdbc.user}" ></property>
        <property name="password" value="${jdbc.password}" ></property>
    </bean>
    <!-- 核心事务管理器 -->
    <bean name="transactionManager" class="org.springframework.orm.hibernate5.HibernateTransactionManager" >
        <property name="sessionFactory" ref="sessionFactory" ></property>
    </bean>
    <tx:annotation-driven transaction-manager="transactionManager" />
    <bean name="sessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean" >
        <property name="dataSource" ref="dataSource" ></property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect" >org.hibernate.dialect.MySQLDialect</prop>
                <!--  可选配置 -->
                <prop key="hibernate.show_sql" >true</prop>
                <prop key="hibernate.format_sql" >true</prop>
                <prop key="hibernate.hbm2ddl.auto" >update</prop>
            </props>
        </property>
        <property name="mappingDirectoryLocations" value="classpath:cn/itcast/domain" ></property>
    </bean>
</beans>

开启注解

    <!-- 开启扫描类中的注解 -->
    <context:component-scan base-package="(项目的包的位置))"></context:component-scan>

Dao层

有技术含量一点的是在Dao层注入SessionFactory，就是下面这几句话

@Resource(name="sessionFactory")
    public void setSF(SessionFactory sf){
        super.setSessionFactory(sf);
    }

注册加注入

Service层

注册@Service(“serviceName”) ，放到类上面。
注入：

    @Resource(name="customerDao")
    private CustomerDao cd;

事务：在service层的类上面直接加。

@Transactional(isolation=Isolation.REPEATABLE_READ,propagation=Propagation.REQUIRED,readOnly=false)

Action层

注册：@Controller(“actionName”)
注入：

    @Resource(name="customerService")
    private CustomerService cs;

多例：@Scope(“prototype”)