spring 依赖注入的问题

Question

这是我的applicationContext.xml
<!-- 把Dao注入给Service -->
<bean id="userService" class="com.allen.service.spring.UserServiceImp">
<property name="userDao">
<ref bean="userDao" />
</property>
</bean>
<!-- 把service注入给Action -->
<bean id="userAction" class="com.allen.action.UserAction">
<property name="userService">
<ref bean="userService"/>
</property>
</bean>
这是我的action
ublic class UserAction extends MappingDispatchAction{
    private UserService userService;
public UserService getUserService() {
return userService;
}
public void setUserService(UserService userService) {
this.userService = userService;
}
public ActionForward login(ActionMapping mapping,ActionForm form,
     HttpServletRequest request,HttpServletResponse response){
String name = request.getParameter("loginName");
String passwd = request.getParameter("loginPassword");
System.out.print(this.getUserService());//这里打印的是空
     if(this.getUserService().userLogin(name,passwd)){//空指针
     return mapping.findForward("succcess");
     }
     return mapping.findForward("failed");
    }
}不是在spring的配置文件中 把service注入到action 中 spring会自动创建 service的实力 为什么得到的会是null》？？

Answer 1

有啊 在userService的实现类中有 

Answer 2

 Spring配置里userDao那个实现类的配置写进去了嘛?

Answer 3

spring是在web.xml里配置的吗？是不是没有初始化配置文件你可以直接写一个main函数getbean看看能不能获取service

Answer 4

<?xml version="1.0" encoding="GB2312"?>
<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">    <!-- 注入数据源 -->
<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/test"></property>
<property name="username" value="root"></property>
<property name="password" value="root"></property>
</bean>
<!-- 注入sessionFactory -->
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="dataSource">
<ref bean="dataSource" />
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">
org.hibernate.dialect.MySQLDialect
</prop>
</props>
</property>
<property name="mappingResources">
<list>
<value>com/allen/model/User.hbm.xml</value></list>
</property></bean>
<!-- 把Dao注入给 sessionFactory -->
<bean id="userDao" class="com.allen.dao.hib.UserDAOImp">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean>
<!-- 把Dao注入给Service -->
<bean id="userService" class="com.allen.service.spring.UserServiceImp">
<property name="userDao">
<ref bean="userDao" />
</property>
</bean>
<!-- 把service注入给Action -->
<bean id="userAction" class="com.allen.action.UserAction">
<property name="userService">
<ref bean="userService"/>
</property>
</bean>
</beans>这是整个spring的配置文件  是不是 web.xml中需要配置什么啊？

Answer 5

啊 web.XML配置好了 又出新问题了 呵呵 我再看看 +分怎么加啊？

Answer 6

严重: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Invocation of init method failed; nested exception is org.hibernate.MappingException: entity class not found: User
Caused by: org.hibernate.MappingException: entity class not found: User这是我的hibernate 配置文件<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- 
    Mapping file autogenerated by MyEclipse Persistence Tools
-->
<hibernate-mapping>
    <class name="User" table="t_users" catalog="test">
        <id name="id" type="java.lang.Long">
            <column name="id" />
            <generator class="native" />
        </id>
        <property name="name" type="java.lang.String">
            <column name="name" length="32" />
        </property>
        <property name="loginName" type="java.lang.String">
            <column name="login_name" length="10" />
        </property>
        <property name="loginPassword" type="java.lang.String">
            <column name="login_password" length="32" not-null="true" />
        </property>
        <property name="status" type="java.lang.Integer">
            <column name="status" not-null="true" />
        </property>
        <property name="phone" type="java.lang.String">
            <column name="phone" length="32" />
        </property>
        <property name="email" type="java.lang.String">
            <column name="email" length="32" />
        </property>
        <property name="enrollDate" type="java.util.Date">
            <column name="enroll_date" length="10" />
        </property>
        <property name="closeDate" type="java.util.Date">
            <column name="close_date" length="10" />
        </property>
        <property name="paymentStyle" type="java.lang.Integer">
            <column name="payment_style" />
        </property>
        <property name="career" type="java.lang.String">
            <column name="career" length="32" />
        </property>
        <property name="nationality" type="java.lang.String">
            <column name="nationality" length="32" />
        </property>
        <property name="gender" type="java.lang.String">
            <column name="gender" length="8" />
        </property>
        <property name="company" type="java.lang.String">
            <column name="company" length="32" />
        </property>
        <property name="address" type="java.lang.String">
            <column name="address" length="32" />
        </property>
        <property name="postCode" type="java.lang.String">
            <column name="post_code" length="16" />
        </property>
    </class>
</hibernate-mapping>

Answer 7

没有找到实体类USER.  
SPRING中你没把ORMAPPING那个映射配置文件写进去

Answer 8

 那个USER类有包路劲吗? 

Answer 9

Caused by: org.hibernate.MappingException: entity class not found: User        

Answer 10

property name="mappingResources"> 
<list> 
<value>com/allen/model/User.hbm.xml </value> </list> 
</property>
这一句不是配置进去了吗

Answer 11

在你的<hibernate-mapping package="包名">