三层架构的电力系统

1.
**使用hibernate，写持久化类，映射文件，hibernate配置文件**
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE
hibernate-mapping PUBLIC "-//Hibernate/Hibernate
Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping

package="com.itcast.elec.domain">
<class
name="ElecText" table="elec_text"> <id name="textID" column="textID" type="string"> <generator class="uuid"/>
</id> <property name="textName" column="textName" type="string"/> <property name="textDate" column="textDate" type="java.util.Date"/>
<property name="textRemark" column="textRemark" type="string"/>
</class>

</hibernate-mapping>
hibernate配置文件
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE
hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

<session-factory>
<!-- Database connection settings -->

<property

name="connection.driver_class">com.mysql.jdbc.Driver</property>

<property

name="connection.url">jdbc:mysql://localhost:3306/itcasttest?useUnicode=true&charEncoding=utf8</property>

<property

name="connection.username">root</property>

<property

name="connection.password">527425</property>
<!-- JDBC connection pool (use the built-in) --> <property name="connection.pool_size">1</property>
<!-- SQL dialect --> <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<!-- Enable Hibernate's automatic session context management --> <property name="current_session_context_class">thread</property>
<!-- Echo all executed SQL to stdout --> <property name="show_sql">true</property>
<!-- Drop and re-create the database schema on startup --> <property name="hbm2ddl.auto">update</property><!--
<property name="hibernate.connection.autocommit">true</property>-->//hibernate事务自动提交

<mapping

resource="com/itcast/elec/domain/ElecText.hbm.xml"/>

</session-factory>

</hibernate-configuration>
2.
**数据访问层**
由于有一些数据库操作是类似的，因此创建一个公共的接口ICommonDao public interface ICommonDao<T>
{ void save(T entity);}其他的类可以继承这个公共接口如IElecTextDao专门负责电力设备管理的接口public
interface IElecTextDao extends ICommonDao<ElecText>{
public static final String SERVICE_NAME = "com.itcast.elec.dao.Impl.IElecTextDaoImpl";//定义实现这个接口的类为常量，便于寻找}**实现类**public
class ICommonImpl<T>
extends HibernateDaoSupport implements ICommonDao<T>
{
@Resource(name="hibernateTemplate")
public final void setHibernateTemplateDi(HibernateTemplate hibernateTemplate){ this.setHibernateTemplate(hibernateTemplate); }
public void save(T entity) { this.getHibernateTemplate().save(entity); }}@Repository(IElecTextDao.SERVICE_NAME)//数据层用@Repository，控制层用@resource，业务层用@service来标注需要被spring配置文件实例化的类public
class IElecTextDaoImpl extends ICommonImpl<ElecText>
implements IElecTextDao {}
3. **引入spring**
<?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 ">

<context:annotation-config/>
<!--
1、配置容器资源扫描的包 ，如@resource，@Repository--> <context:component-scan

base-package="com.itcast.elec"></context:component-scan>
<!--
2、? -->
<!--
3、创建sessionfactory，由spring提供 --> <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> <property
name="configLocation"> <value> classpath:hibernate.cfg.xml </value>
</property> </bean>
<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate"> <property name="sessionFactory" ref="sessionFactory"></property>
</bean> <!-- 4、创建事务管理器 ，spring负责创建--> <bean id="txManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory"></property> </bean> <!-- 5、使用注解管理事务 -->
<tx:annotation-driven transaction-manager="txManager" /></beans>**业务层**跟数据层一样，也是先写一个接口，再写一个实现类public
interface IElecTextService {
public static final String SERVICE_NAME= "com.itcast.elec.service.Impl.ElecTextServiceImpl";
void saveElecText(ElecText elecText);}package
com.itcast.elec.service.Impl;import
javax.annotation.Resource;import
org.springframework.stereotype.Repository;import
org.springframework.stereotype.Service;import
org.springframework.transaction.annotation.Isolation;import
org.springframework.transaction.annotation.Propagation;import
org.springframework.transaction.annotation.Transactional;import
com.itcast.elec.dao.IElecTextDao;import
com.itcast.elec.domain.ElecText;import
com.itcast.elec.service.IElecTextService;@Repository(IElecTextService.SERVICE_NAME)@Transactional(readOnly=true)public
class ElecTextServiceImpl implements IElecTextService {
@Resource(name=IElecTextDao.SERVICE_NAME)
private IElecTextDao iElecTextDao;
//Propagation.REQUIRED,没有事务创建事务，有就在事务中运行，Isolation.DEFAULT与数据库的事务隔离机制一样
@Transactional(isolation=Isolation.DEFAULT,propagation=Propagation.REQUIRED,readOnly=false)//Isolation.DEFAULT使用和数据库一样的事务隔离机制，Propagation.REQUIRED表示有事务就是用当下的事务，没有就创建新事务
public void saveElecText(ElecText elecText) {
iElecTextDao.save(elecText);
}}
4. **控制层，引入Struts2**先建立一个基础action，实现actionsupport，并实现ServletRequestAware,ServletResponseAware，获得request和responsepublic
class BaseAction extends ActionSupport implements ServletRequestAware,ServletResponseAware {
protected ServletRequest request;
protected ServletResponse response;
public void setServletRequest(HttpServletRequest req) {
this.request = req;
}
public void setServletResponse(HttpServletResponse res) { this.response = res; }}@SuppressWarnings("serial")@Controller("elecTextAction")@Scope(value="prototype")//spring
默认scope 是单例模式即@Scope(value="singleton")，这样只会创建一个Action对象每次访问都是同一个Action对象，数据不安全，struts2
是要求 每次次访问 都对应不同的Action，scope="prototype" 可以保证 当有请求的时候 都创建一个Action对象public
class ElecTextAction extends BaseAction implements ModelDriven<ElecText>{
@Resource(name=IElecTextService.SERVICE_NAME)
private IElecTextService iElecTextService;
ElecText elecText = new ElecText();
public ElecText getModel() {
return elecText;
}
public String save(){
iElecTextService.saveElecText(elecText);
return SUCCESS;
}}struts2的xml配置<?xml
version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN"
"http://struts.apache.org/dtds/struts-2.1.7.dtd">

<struts>

<constant

name="struts.devMode"

value="true"></constant>

<constant

name="struts.ui.theme"

value="simple"></constant>

<constant

name="struts.action.extension"

value="do"></constant>//只接受后缀名为.do的action

<package

name="system"

namespace="/system"

extends="struts-default">

<action

name="elecTextAction_*"

class="elecTextAction"

method="{1}">

<result

name="success">/system/textAdd.jsp</result>

</action>

</package>

</struts>xml配置，设置struts2的过滤器,web服务器启动需要加载applicationContext.xml，添加spring监听器<?xml
version="1.0" encoding="UTF-8"?><web-app
version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<welcome-file-list>

<welcome-file>index.jsp</welcome-file>

</welcome-file-list>

<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>

<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></web-app>
5. **junit测试**省略