Spring中为什么我每次getBean()都为空

[atong3079]

Spring中为什么我每次getBean()都为空，我明明配置了applicationContext.xml。为什么没给我注入进去啊，
public class SaveUserAction extends ActionSupport {
User user;
UserService userService;

public UserService getUserService() {
return userService;
}

public void setUserService(UserService userService) {
this.userService = userService;
}

public User getUser() {
return user;
}

public void setUser(User user) {
this.user = user;
}
public String execute() throws Exception {
BeanFactory factory=new ClassPathXmlApplicationContext("applicationContext.xml");
UserService userSerice=(UserService)factory.getBean("userService");
userSerice.add(user);
return SUCCESS;
}

}

[atong3079]

各位大侠们，求解啊。我定义了bean为什么提示No bean named 'userService' is defined

[tanwan]

[Quote=引用 1 楼 atong3079 的回复:]
各位大侠们，求解啊。我定义了bean为什么提示No bean named 'userService' is defined
[/Quote]
把applicationContext.xml贴出来看看

[cntaizi]

[Quote=引用 2 楼 tanwan 的回复:]

引用 1 楼 atong3079 的回复:
各位大侠们，求解啊。我定义了bean为什么提示No bean named 'userService' is defined

把applicationContext.xml贴出来看看
[/Quote]

+1

[atong3079]

原来大小写搞错了，请问大家，是不是每次都要构建一个beanfactory？
public String execute() throws Exception {
BeanFactory factory=new ClassPathXmlApplicationContext("applicationContext.xml");
UserService userSerice=(UserService)factory.getBean("userService");
userService.add(user);
可不可以不构建beanfactory来获得实例直接写
userService.add(user)吗？
我看郎溪老师就是这样写的，我的出空指针异常，他的怎么没问题？

[aini136234058]

BeanFactory factory=new ClassPathXmlApplicationContext("applicationContext.xml");
没这样写过

private UserService userService；
直接这样就可以拿到啊。。

[haixiang710]

可以不用工厂去加载的..
在web.xml里配spring

<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>

启动时spring就会自动在配置的classpath去加载applicationContext.xml
spring就会根据配置文件去自动注入.

[重o0o生]

你可以写一个创建BeanFactory的单例类，，这样就不会次次都得加载applicationContext.xml

[yangfeihu]

难道没访问一次据加载xml构建beanfactory一次吗?

就没有这样写代码的. 可能那个老师是涂个方面给你们写测试例子吧；

[atong3079]

为什么我配置了spring还是没给我注入呢。难道一定要写工厂？

[atong3079]

<?xml version="1.0" encoding="UTF-8"?>
<beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd" >


<bean id="datasource" class="org.apache.commons.dbcp.BasicDataSource" >
<property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
<property name="url" value="jdbc:mysql://localhost:3306/student"></property>
<property name="username" value="root" />
<property name="password" value="chenlin"></property>

</bean>
<bean id="sessionfactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">


<property name="mappingResources">
<list>
<value>com/bean/User.hbm.xml</value>
</list>
</property>

<property name="dataSource" ref="datasource"></property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
<prop key="hibernate.show_sql">true</prop>
</props>

</property>

</bean>
<bean id="userDao" class="com.dao.imp.UserDaoImp">
<property name="sessionFactory">
<ref bean="sessionfactory"/>
</property>
</bean>
<bean id="UserService" class="com.manager.imp.Usermanager">
<property name="userDao" ref="userDao"></property>

</bean>
<bean id="saveUserAction" class="com.action.user.SaveUserAction">
<property name="userService" >
<ref bean="UserService"/>
</property>
</bean>