sping+struts+iBatis框架搭建

一、配置spring文件，applicationContext-db-config.xml，如下

<?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"

xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd

http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd

http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd

">

 

<!--tomcatJNDI配置方式配置，默认JNDI名字为default，如果修改JNDI名字，请修改本配置的jndiName属性-->

<bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean">  

      <property name="jndiName" value="java:comp/env/default"/>  

</bean>

        <bean id="jdbcExtractor" class="org.springframework.jdbc.support.nativejdbc.C3P0NativeJdbcExtractor" />

 

<bean id="lobHandler" class="org.springframework.jdbc.support.lob.OracleLobHandler"

lazy-init="true">

<property name="nativeJdbcExtractor" ref="jdbcExtractor" />

</bean>

 

<!--ibatisSqlMapClient  -->

<bean id="ibatisSqlMapClient" class="org.springframework.orm.ibatis.SqlMapClientFactoryBean"

scope="prototype">

<property name="configLocation" value="classpath:sqlmap-config.xml" />

<property name="lobHandler" ref="lobHandler" />

<property name="dataSource" ref="dataSource" />

</bean>

 

<bean id="ibatisDao" class="com.dao.IbatisDaoImpl">

<property name="sqlMapClient" ref="ibatisSqlMapClient" />

</bean>

 

<!-- ibatis事务管理 -->

<bean id="ibatisTransactionManager"

class="org.springframework.jdbc.datasource.DataSourceTransactionManager">

<property name="dataSource" ref="dataSource" />

</bean>

 

<tx:advice id="ibatisTxAdvice" transaction-manager="ibatisTransactionManager">

<tx:attributes>

<tx:method name="insert*" />

<tx:method name="update*" />

<tx:method name="delete*" />

<tx:method name="execute*" />

<tx:method name="*" read-only="true" />

</tx:attributes>

</tx:advice>

 

<aop:config>

<aop:advisor pointcut="execution(* *..*DaoFactory.*(..))"

advice-ref="ibatisTxAdvice" />

</aop:config>

</beans>

二、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>

<!-- struts2中action后缀名 -->

<constant name="struts.action.extension" value="action" />

 

<!-- 默认编码方式 -->

<constant name="struts.i18n.encoding" value="utf-8" />

 

<!-- 是否为开发模式，在开发模型中可以获得更多的跟踪信息 -->

<constant name="struts.devMode" value="false" />

 

<!-- 标签主题 -->

<constant name="struts.ui.theme" value="xframe" />

 

<!-- 资源文件名称 -->

<constant name="struts.custom.i18n.resources" value="globalMessages" />

 

<!--静态资源文件配置 -->

<constant name="struts.serve.static" value="true" />

 

<!-- 在开发模式下启用 配置改变时自动加载 -->

<constant name="struts.convention.classes.reload" value="true" />

 

<!--  允许Ognl表达式访问静态方法-->

<constant name="struts.ognl.allowStaticMethodAccess" value="true" />

 

<!-- 上传文件的最大文件大小 -->

<constant name="struts.multipart.maxSize" value="20485760" />

 

<!-- 在寻找资源时是否忽略大小写 -->

<constant name="struts.configuration.classpath.forceLowerCase"

value="false" />

 

<!-- codebehind中查找action的返回结果资源时的默认文件夹 -->

<constant name="struts.codebehind.pathPrefix" value="/pages/" /

</struts>

三、IbatisDaoImpl需继承SqlMapClientDaoSupport

四、sping中 FactoryBean接口及机制

在上面的配置片段中可以，类ShopDaoRelease是我们具体的一个dao实现，其继承了SqlMapClientDaoSupport，后者暴露出一个sqlMapClient属性，用于接受Spring的注射。SqlMapClientDaoSupport会对其中封装的SqlMapClientTemplate做相应的设置，所以DAO子类便可在取用SqlMapClientTemplate时正常地工作了。

但是我们可以通过查看源码发现在SqlMapClientDaoSupport类中，关于setSqlMapClient方法的定义：

 

 /**
     * Set the iBATIS Database Layer SqlMapClient to work with.
     * Either this or a "sqlMapClientTemplate" is required.
     * @see #setSqlMapClientTemplate
     */
    public final void setSqlMapClient(SqlMapClient sqlMapClient) {
        if (!this.externalTemplate) {
            this.sqlMapClientTemplate.setSqlMapClient(sqlMapClient);
        }
    }

而我们的配置文件中名字为“sqlMapClient”的bean的类型却为org.springframework.orm.ibatis.SqlMapClientFactoryBean，而非为com.ibatis.sqlmap.client.SqlMapClient。这不免让人产生疑问，怎么能把org.springframework.orm.ibatis.SqlMapClientFactoryBean类型的实例注入给com.ibatis.sqlmap.client.SqlMapClient类型的属性呢？

 

 

这是因为Spring的机制的缘故。简单的说，如果一个bean实现了 FactoryBean接口，那么Spring就不会把该bean本身实例化并返回，而是返回该bean的getObject()返回的对象。这是Sprign的游戏规则。我们来看一眼 SqlMapClientFactoryBean的源码片段：

public class SqlMapClientFactoryBean implements  FactoryBean,InitializingBean {
    private SqlMapClient sqlMapClient;
    protected SqlMapClient buildSqlMapClient(Resource configLocation,Properties properties) throws IOException {
        InputStream is = configLocation.getInputStream();
        if (properties != null) {
            if (buildSqlMapClientWithInputStreamAndPropertiesMethodAvailable) {
                return SqlMapClientBuilder.buildSqlMapClient(is,properties);
            } else {
                return SqlMapClientBuilder.buildSqlMapClient(new InputStreamReader(is), properties);
            }
        } else {
            if (buildSqlMapClientWithInputStreamMethodAvailable) {
                return SqlMapClientBuilder.buildSqlMapClient(is);
            } else {
                return SqlMapClientBuilder.buildSqlMapClient(new InputStreamReader(is));
            }
        }
    }
    //这里就是返回的、并会被注入到其它类里的对象
    public Object getObject() {
        return this.sqlMapClient;
    }
}