SSH2（Struts2、Spring3与Hibernate3）的整合

Struts2、Spring与Hibernate是当前比较流行的开源框架，下面介绍一下他们的整合方法：

1、添加Spring、Hibernate、Struts2支持，

首先通过MyEclipse对项目添加Spring支持，添加时选择这些包：

Spring3.0 AOP Libraries

Spring3.0 Core Libraries

Spring3.0 Persistence Core Libraries

Spring3.0Persistence JDBC Libraries

Spring3.0 Web Libraries。

然后添加Hibernate支持，在项目中添加数据库驱动，并引入Hibernate jar包 （hibernate core 和hibernate anotations）

然后添加Struts2的jar包，引入下面这些jar包

struts2-core-2.1.8.1.jar

xwork-core-2.1.6.jar

ognl-2.7.3.jar

freemarker-2.3.15.jar

commons-fileupload-1.2.1.jar

commons-logging-1.0.4.jar

struts2-spring-plugin-2.1.8.1.jar

2、配置web.xml

首先web在.xml文件中配置监听器，用于在系统启动时载入Spring的配置文件

<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>

若需要加入spring编码过滤器，则还需在web.xml中加入如下代码：

<filter>
<filter-name>characterEncodingFilter</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>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>characterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

然后在web.xml文件中配置Spring中OpenSessionInViewFilter过滤器解决hibernate延迟加载的问题

<!-- 解决hibernate延迟加载带来的异常，配置过滤器使Session在请求完成之后再关闭 -->
<filter>
<filter-name>OpenSessionInViewFilter</filter-name>
<filter-class>
org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>OpenSessionInViewFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

3、配置applicationContext.xml

数据源采用c3p0,

<?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:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<context:property-placeholder location="classpath:jdbc.properties"/>

<!-- 配置c3p0数据源 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${jdbc.driverClass}"/>
<property name="jdbcUrl" value="${jdbc.jdbcUrl}"/>
<property name="user" value="${jdbc.user}"/>
<property name="password" value="${jdbc.password}"/>

<property name="maxPoolSize" value="${c3p0.pool.maxPoolSize}"/>
<property name="minPoolSize" value="${c3p0.pool.minPoolSize}"/>
<property name="initialPoolSize" value="${c3p0.pool.initialPoolSize}"/>
<property name="acquireIncrement" value="${c3p0.pool.acquireIncrement}"/>
</bean>

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource">
<ref bean="dataSource" />
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">${hibernate.dialect}</prop>
<prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
<prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}</prop>
</props>
</property>

<property name="packagesToScan">
<list>
<value>com.xiaoyu.pvod.model</value>
</list>
</property>
</bean>
<!-- 配置事物管理器 -->
<bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory"></property>
</bean>

<!-- 配置advice 事物传播特性 -->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="save*" propagation="REQUIRED" isolation="DEFAULT"/>
<tx:method name="update*" propagation="REQUIRED" isolation="DEFAULT"/>
<tx:method name="delete**" propagation="REQUIRED" isolation="DEFAULT"/>
<tx:method name="batch*" propagation="REQUIRED" isolation="DEFAULT"/>

<tx:method name="get*" propagation="REQUIRED" isolation="DEFAULT" read-only="true"/>
<tx:method name="load*" propagation="REQUIRED" isolation="DEFAULT" read-only="true"/>
<tx:method name="find*" propagation="REQUIRED" isolation="DEFAULT" read-only="true"/>

<tx:method name="*" propagation="REQUIRED" isolation="DEFAULT" />
</tx:attributes>
</tx:advice>

<!-- 事务管理器应用范围 -->
<aop:config>
<aop:pointcut id="affectMethods" expression="execution(* com.xiaoyu.pvod.dao.*.*(..))" />
<aop:advisor advice-ref="txAdvice" pointcut-ref="affectMethods" />
</aop:config>

<!-- HibernateTemplate -->
<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate">
<property name="sessionFactory" ref="sessionFactory"></property>
</bean>

</beans>

配置jdbc.properties

jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.jdbcUrl=jdbc:mysql://localhost:3306/pvod
jdbc.user=root
jdbc.password=rootroot

c3p0.pool.maxPoolSize=10
c3p0.pool.minPoolSize=2
c3p0.pool.initialPoolSize=3
c3p0.pool.acquireIncrement=2

hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
hibernate.hbm2ddl.auto=update
hibernate.show_sql=true

配置log4j.properties(src/log4j.properties)

log4j.rootLogger=info,A1,B1
#,B1

log4j.appender.A1=org.apache.log4j.RollingFileAppender
log4j.appender.A1.File=${catalina.home}/webapps/pvod/logs/pvod.log
log4j.appender.A1.MaxFileSize=200KB
log4j.appender.A1.MaxBackupIndex=10
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.A1.layout.ConversionPattern=%5p [%t] (%F:%L) -%d %m%n

log4j.appender.B1=org.apache.log4j.ConsoleAppender
log4j.appender.B1.layout=org.apache.log4j.PatternLayout
log4j.appender.B1.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n

4、配置struts.xml

<?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 name="struts.i18n,encoding" value="UTF-8"/>
<constant name="struts.ui.theme" value="simple"/>

<package name="com.xiaoyu.pvod.struts" namespace="/" extends="struts-default">

</package>

</struts>

配置工作基本就完成了，注意删除项目中得一些重复jar包，删除以asm带头的jar包，如asm-2.2.3.jar，否则可能导致项目启动失败

5、测试

在项目中创建好DAO、Service、Action层的类文件，并在struts.xml和applicationContext.xml中作相应的配置后，写好JSP测试文件后就可以测试了。具体过程比较简单，这里就不谈了。