ssh整合

ssh分别是：struts是表现层 hibernate是持久层 spring是容器工具，他们3个整合后的目标是：表现层和持久层所有对象实例交给ioc统一管理,降低层次间的依赖，包括持久层SessionFactory 以及事务管理都给spring管理。

第一是在web应用中什么实际加载springioc容器以及如何加载？

这个时机选在Servlet加载的时候将ioc添加到ServletContent作用域中。

具体需要在web.xml加入ServletContext监听器

<context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>
             //默认spring的xml配置文件和Servlet-name相同  如果给xml取别名，则在此定义
      <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

第二是spring如何整合hibernate的SessionFactory以及事务管理的整合?

注入spring自带的LocalSessionFactory

具体的步骤应该在先配置数据源再配置SessionFactory和事务

<?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:context="http://www.springframework.org/schema/context"
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/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">



    <!-- 导入资源文件 -->
    <context:property-placeholder location="classpath:db.properties"/>

    <!-- 配置 C3P0 数据源 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="user" value="${jdbc.user}"></property>
        <property name="password" value="${jdbc.password}"></property>
        <property name="driverClass" value="${jdbc.driverClass}"></property>
        <property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>
        
        <property name="initialPoolSize" value="${jdbc.initPoolSize}"></property>
        <property name="maxPoolSize" value="${jdbc.maxPoolSize}"></property>
    </bean>
    
    <!-- 配置 SessionFactory -->
    <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <property name="configLocation" value="classpath:hibernate.cfg.xml"></property>
        <property name="mappingLocations" value="classpath:com/atguigu/ssh/entities/*.hbm.xml"></property>
    </bean>
    
    <!-- 配置 Spring 的声明式事务 -->
    <!-- 1. 配置 hibernate 的事务管理器 -->
    <bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory"></property>
    </bean>

    <!-- 2. 配置事务属性 -->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <tx:method name="get*" read-only="true"/>
            <tx:method name="lastNameIsValid" read-only="true"/>
            <tx:method name="*"/>
        </tx:attributes>
    </tx:advice>
    
    <!-- 3. 配置事务切入点, 再把事务属性和事务切入点关联起来 -->
    <aop:config>
        <aop:pointcut expression="execution(* com.atguigu.ssh.service.*.*(..))" id="txPointcut"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointcut"/>
    </aop:config>

第三是如何将strutsAction的实例交给spring管理？

引用strtus框架中的接入spring的插件【struts2-spring-plugin-vesion】

加入struts第一步向web.xml引入struts的独有StrutsPrepareAndExecuteFilter

<!-- 配置 Struts2 的 Filter -->
    <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

第四是spring如何管理持久层和服务层的接口和实现？

有2各种方案，第一种使用spring的注解方式，配置使用扫描形式自动注入已注解的类的实例。

第二种是统一使用spring配置文件方式统一采用seter设值方式注入。

这里展示xml配置的方式，配置如下：

 //设值注入dao层接口
<bean id="employeeDao" class="com.atguigu.ssh.dao.EmployeeDao">
        <property name="sessionFactory" ref="sessionFactory"></property>
    </bean>
    
    <bean id="departmentDao" class="com.atguigu.ssh.dao.DepartmentDao">
        <property name="sessionFactory" ref="sessionFactory"></property>
    </bean>
    //注入服务
    <bean id="employeeService" class="com.atguigu.ssh.service.EmployeeService">
        <property name="employeeDao" ref="employeeDao"></property>
    </bean>
    
    <bean id="departmentService" class="com.atguigu.ssh.service.DepartmentService">
        <property name="departmentDao" ref="departmentDao"></property>
    </bean>
    //注入action的服务
    <bean id="employeeAction" class="com.atguigu.ssh.actions.EmployeeAction"
        scope="prototype"> //注意因为struts 每个action是新的请求 scope必须配成原型 不然默认是single
        <property name="employeeService" ref="employeeService"></property>    
        <property name="departmentService" ref="departmentService"></property>
    </bean>

hibernate.cfg.xml---------------------------------------------------------------------------------------------

<session-factory>



<property name="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>


<property name="hibernate.show_sql">true</property>
<property name="hibernate.format_sql">true</property>


<property name="hibernate.hbm2ddl.auto">update</property>



</session-factory>

db.properties---------------------------------------------------------------------------------------------

jdbc.user=root
jdbc.password=
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.jdbcUrl=jdbc:mysql:///test

jdbc.initPoolSize=2
jdbc.maxPoolSize=4
#...

struts.xml---------------------------------------------------------------------------------------------

<package name="default" namespace="/" extends="struts-default">


<interceptors>
<interceptor-stack name="sshStack">
<interceptor-ref name="paramsPrepareParamsStack">
<param name="prepare.alwaysInvokePrepare">false</param>
</interceptor-ref>
</interceptor-stack>
</interceptors>


<default-interceptor-ref name="sshStack"></default-interceptor-ref>

<action name="emp-*" class="employeeAction"
method="{1}">
<result name="list">/WEB-INF/views/emp-list.jsp</result>
<result type="stream" name="ajax-success">
<param name="contentType">text/html</param>
<param name="inputName">inputStream</param>
</result>
<result name="input">/WEB-INF/views/emp-input.jsp</result>
<result name="success" type="redirect">/emp-list</result>
</action>

</package>

</struts>

Department.hbm.xml ---------------------------------------------------------------------------------------------

Employee.hbm.xml 多对一---------------------------------------------------------------------------------------------

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
<class name="com.atguigu.ssh.entities.Employee" table="SSH_EMPLOYEE">

<id name="id" type="java.lang.Integer">
<column name="ID" />
<generator class="native" />
</id>

<property name="lastName" type="java.lang.String">
<column name="LAST_NAME" />
</property>

<property name="email" type="java.lang.String">
<column name="EMAIL" />
</property>

<property name="birth" type="java.util.Date">
<column name="BIRTH" />
</property>

<property name="createTime" type="java.util.Date">
<column name="CREATE_TIME" />
</property>


<many-to-one name="department" class="com.atguigu.ssh.entities.Department">
<column name="DEPARTMENT_ID" />
</many-to-one>

</class>
</hibernate-mapping>