Spring+Servlet整合(如何向Servlet注入属性(转),servlet获取spring容器中的bean)

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1.Spring数据库的配置

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<?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:tx="http://www.springframework.org/schema/tx"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd ">
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"
scope="singleton">
<property name="dataSource" ref="dataSource"/>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">
org.hibernate.dialect.SQLServerDialect
</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="jdbc.use_scrollable_resultset">true</prop>
<prop key="hbm2ddl">true</prop>
</props>
</property>
<property name="mappingResources">
<list>
<value>abu/csdn/bean/User.hbm.xml</value>
</list>
</property>
</bean>
<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate" scope="singleton">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>
<bean id="dataSource"
class="org.apache.commons.dbcp.BasicDataSource" scope="singleton">
<property name="driverClassName"
value="com.microsoft.sqlserver.jdbc.SQLServerDriver">
</property>
<property name="url"
value="jdbc:sqlserver://localhost:1433;databaseName=csu">
</property>
<property name="username" value="liky"/>
<property name="password" value="redhat"/>
</bean>
<bean id="transactionManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="save*" propagation="REQUIRED" />
<tx:method name="delete*" propagation="REQUIRED" />
<tx:method name="update*" propagation="REQUIRED" />
<tx:method name="find*" read-only="true" />
</tx:attributes>
</tx:advice>
<aop:config>
<aop:advisor pointcut-ref="allServiceMethods"
advice-ref="txAdvice" />
</aop:config>
</beans>

2.Servlet

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package abu.csdn.servlet;
import java.io.IOException;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.orm.hibernate3.HibernateTemplate;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;
/**
*
* 演示使用Spring向Servlet注入对象
*
* User: Abu Date: 2009-7-2 Time: 14:30:55
*/
public class CopyOfShowImageServlet extends HttpServlet {
HibernateTemplate hibernateTemplate;
/**
*
* 在Servlet中注入对象的步骤:
* 1.取得ServletContext
* 2.利用Spring的工具类WebApplicationContextUtils得到WebApplicationContext
* 3.WebApplicationContext就是一个BeanFactory,其中就有一个getBean方法
* 4.有了这个方法就可像平常一样为所欲为了,哈哈!
*
*/
@Override
public void init() throws ServletException {
super.init();
ServletContext servletContext = this.getServletContext();
WebApplicationContext ctx = WebApplicationContextUtils.getWebApplicationContext(servletContext);
hibernateTemplate = (HibernateTemplate)ctx.getBean("hibernateTemplate");
}
@Override
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
@Override
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
}
}

3.总结

你应该看到了,我在Spring中使用了声明式事务,如果直接使用Spring的工厂类在这里是不行的,因为所有的对象都已经有Spring的IoC管理了,所以只能借助WebApplicationContextUtils这个工具类来获得Bean.