[转]Dwr整合spring

Dwr整合spring

我在实战dwr那篇文章里面介绍了怎么调用服务器端的java类，这次我要把数据库的调用通过spring容器注入到这个类里面，然后用dwr来调用这个类里面的方法访从数据库中取得数据

首先，要保证hibernate所需的jar文件都齐全了

其次，写好你的spring-application.xml文件把里面的bean都配置好了。

介绍一下：

关于对数据库的调用，我的习惯是采用3层架构，即web,service,dao。Web层即表现层，就是最终调用层。Service层是业务逻辑层，可以对数据加工。Dao层是最终访问数据库层。Dao层我采用spring的事务代理器TransactionProxyFactoryBean代理；service我采用spring的普通的bean代理器ProxyFactoryBean代理；web层就是上面所说的那个java类，在这里，我也把它配置到spring容器里面了，作为一个spring的bean来使用。通过spring容器，我把dao层注入到service层，把service层注入到web层即那个java类，作为它的一个属性来使用。

我把实例写出来看看：

spring-application.xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">

<beans>

<bean id="dataSource"

              class="org.springframework.jndi.JndiObjectFactoryBean">

              <property name="jndiName">

                     <value>java:comp/env/VSPN18DATASOURCE</value>

              </property>

</bean>

<bean id="dtatImportSessionFactory"

              class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">

              <property name="dataSource">

                     <ref bean="dataSource" />

              </property>

              <property name="mappingResources">

                     <list>                                         <value>com\vstsoft\dataimport\dto\Dealer.hbm.xml</value>

                     </list>

              </property>

              <property name="hibernateProperties">

                     <props>

                            <prop key="hibernate.dialect">

                                   org.hibernate.dialect.MySQLDialect

                            </prop>

                            <prop key="hibernate.show_sql">false</prop>

                     </props>

              </property>

</bean>

<bean id="transactionManager"

              class="org.springframework.orm.hibernate3.HibernateTransactionManager">

              <property name="sessionFactory">

                     <ref local="dtatImportSessionFactory" />

              </property>

</bean>

<bean id="impDealerDAO"

              class="com.vstsoft.dataimport.dao.impl.DealerDAOImpl">

              <property name="sessionFactory">

                     <ref local="dtatImportSessionFactory" />

              </property>

</bean>

<bean id="dealerDAOProxy"

              class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">

              <property name="transactionManager">

                     <ref bean="transactionManager" />

              </property>

              <property name="target">

                     <ref local="impDealerDAO" />

              </property>

              <property name="transactionAttributes">

                     <props>

                            <prop key="insert*">PROPAGATION_REQUIRED</prop>

                            <prop key="find*">PROPAGATION_REQUIRED,readOnly</prop>

                     </props>

              </property>

</bean>

<bean id="dealerManage"

              class="org.springframework.aop.framework.ProxyFactoryBean">

              <property name="proxyInterfaces">

                     <value>com.vstsoft.dataimport.service.DealerManage</value>

              </property>

              <property name="target">

                     <ref bean="dealerManageTarget" />

              </property>

       </bean>

       <bean name="dealerManageTarget"

              class="com.vstsoft.dataimport.service.impl.DealerManageTarget">

              <property name="dealerDAO">

                     <ref bean="dealerDAOProxy" />

              </property>

       </bean>

       <bean name="monitor" singleton="false"

              class="com.vstsoft.dataimport.dto.Monitor">

              <property name="dealerManage">

                     <ref bean="dealerManage" />

              </property>

       </bean>

</beans>

要注意的是这个bean”monitor”它就是最终调用即我们的那个调用类。我把它当作一个spring容器的bean来管理，并且把service层注入了它里面。

那，接下来，我们要修改dwr.xml了：

原来的配置

<create creator="new" javascript="DealerMonitor">

           <param name="class"

              value="com.vstsoft.dataimport.dto.Monitor" />

</create>

联手spring之后的配置

<create creator="spring" javascript="DealerMonitor">

                     <param name="beanName" value="monitor"></param>

       <!-- 指定Spring配置文件的位置，如果没设置DWR会根据web.xml找到主配置文件，不过速度上就慢了    

                            <param name="location" value="applicationContext.xml"></param>-->

</create>

这里的creater改成了spring，并且声明了要调用的spring容器中的bean

Java类Monitor相应的变成了：

package com.vstsoft.dataimport.dto;

 

import java.util.ArrayList;

import java.util.HashMap;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import java.util.Set;

 

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

 

import com.vstsoft.dataimport.service.DealerManage;

 

/**

 * author:sunjianbin <br>

 * email:[e-mail]

 */

public class Monitor {

       private static Log log = LogFactory.getLog(Monitor.class);

 

       private DealerManage dealerManage;

 

       /**

        * 从数据库中取得数据

        */

       public List findDealers() {

              if (dealerManage == null) {

                     log.info("dealerManage 没有注入");

              }

              List list = dealerManage.findDealers();

              log.info("list size:" + list.size());

              return list;

       }

 

       public DealerManage getDealerManage() {

              return dealerManage;

       }

 

       public void setDealerManage(DealerManage dealerManage) {

              this.dealerManage = dealerManage;

       }

}