spring注释注入

业务对的代码如下：
@Transactional
@Component("loginService")
public class LoginServiceImp implements LoginService { private LoginDAO loginDao;
public User getUserByNamePass(User user) {
// TODO Auto-generated method stub
//loginDao.getUserByNamePass(user);
return loginDao.getUserByNamePass(user);
} public void save(User user) {
// TODO Auto-generated method stub
System.out.println("Service保存");
loginDao.save(user);
} public LoginDAO getLoginDao() {
return loginDao;
}
@Resource
public void setLoginDao(LoginDAO loginDao) {
this.loginDao = loginDao;
}}我在Struts2中的Action中调用上面的代码如下：
public class LoginAction extends ActionSupport {
private LoginService loginService;

@Override
public String execute() throws Exception {
HttpServletRequest request=ServletActionContext.getRequest();
HttpServletResponse response = ServletActionContext.getResponse();
response.setContentType("text/html");
response.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter();
String userName = request.getParameter("userName");
String password = request.getParameter("password");
System.out.println("�õ���ֵ=="+userName+"=="+password);
User user = new User();
user.setUsername(userName);
user.setPassword(password);
User use = new User();
use = (User)loginService.getUserByNamePass(user);
System.out.println("use==="+use);
if(use!=null){
return "success" ;
}else
{
out.println("<script>alert('����用户名或密码不对，请查证后重登!');history.go(-1);</script>");

return null;
}
} public LoginService getLoginService() {
return loginService;
}
@Resource
public void setLoginService(LoginService loginService) {
this.loginService = loginService;
}}
loginService不是已经交给Spring管理了吗？在程序启动时，Spring不是已经初始化了吗？
我在LoginAction中注入后不是就可以使用了吗？
但是它会报如下的错误：
java.lang.NullPointerException
com.common.action.LoginAction.execute(LoginAction.java:38)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:585)
com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:440)
com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:279)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:242)
com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:163)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:249)
org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:122)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:148)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:93)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:235)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:89)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:128)
web.xml配置如下：
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:beans.xml</param-value>
</context-param>
<!-- 对Spring进行实例化 -->
<listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>
<!-- 配置Struts -->
<!---->
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.FilterDispatcher
</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<welcome-file-list>
<welcome-file>login.jsp</welcome-file>
</welcome-file-list>
</web-app>
spring 的配置beans.xml:
<?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"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-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/context http://www.springframework.org/schema/context/spring-context-2.5.xsd">
           
          <context:annotation-config/>
           <context:component-scan base-package="com.common"></context:component-scan>
        <!-- <aop:aspectj-autoproxy></aop:aspectj-autoproxy> -->  
       
        <!-- 数据库的连接 -->
           <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
             <property name="driverClassName" value="com.microsoft.jdbc.sqlserver.SQLServerDriver"></property>
            <property name="url" value="jdbc:microsoft:sqlserver://127.0.0.1:1433;DatabaseName=bzsms"></property>
            <property name="username" value="sa"></property>
            <property name="password" value="123456"></property> 
           
           </bean>
           <!-- 配置hibernate -->
          <bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
           <property name="dataSource" ref="dataSource"></property>
        
            <property name="annotatedClasses">
             <list>
               
              <value>com.common.module.User</value>
                </list>
            </property>
           <property name="hibernateProperties">
             <value>
                           hibernate.dialect=org.hibernate.dialect.SQLServerDialect
             hibernate.show_sql=false
             hibernate.format_sql=false
             </value>
           </property>
          </bean>
          
          
          
          <!-- 事务管理器 -->
          <bean id="txManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
           <property name="sessionFactory" ref="sessionFactory"></property>
          </bean>
          <!-- 事务打开方式，此处为注解方式打开 -->
          <tx:annotation-driven transaction-manager="txManager"/>
</beans>
struts.xml:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">
    
    
<struts><!--
    <include file="struts2.xml"></include>
   <constant name="struts.custom.i18n.resources" value="message"></constant>
   <constant name="struts.i18n.encoding" value="gbk"></constant>
   -->
 <package name="struts2"  extends="struts-default">
      <action name="login" class="com.common.action.LoginAction">
      <result name="success" >index.jsp</result>       
      <result name="input">login.jsp</result>
     </action>
    
</package>
</struts>各位大哥帮个忙呀。急！！小弟在此谢谢了。。在线等！

解决方案 »

  1.   

    你在xml中没有声明loginservice吧
      

  2.   

    spring 的配置beans.xml:中没有对loginservice进入注入：
    <bean id="orderInfoServiceTarget" class="com.xinwei.shop.order.service.impl.OrderInfoService">
    <property name="sessionFactory">
    <ref local="sessionFactory"/>
    </property>
    </bean><!-应先写DAO的，把DAO注入到Service,楼主没有->
    <!-注入事务->
    <bean id="orderInfoService" parent="txManager">
    <property name="target">
    <ref local="orderInfoServiceTarget"/>
    </property>
    </bean>
      

  3.   

    2楼的兄弟，，我在beans.xml中已经注入service了。。是用注释方式注入的。。在loginservice的业务中用@Component("loginService")注入的。。DAO也是用这种方式注入的。。DAO的注入是成功的。service也注入成功的。。但是调用service时还得用
    ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
    loginService = (LoginService)ctx.getBean("loginService");
    这种方式得到注入的service,但是调用DAO时直接把DAO
    private SessionFactory sessionFactory;

    public SessionFactory getSessionFactory() {
    return sessionFactory;
    }
    @Resource
    public void setSessionFactory(SessionFactory sessionFactory) {
    this.sessionFactory = sessionFactory;
    }    用这种方式得值就OKservice理论上用这种方式也行。。但是就是得不到，，报上面那个错误、、
      

  4.   

    你注解loginService的方式好像错了吧.
    记得好像是
    @Repostory(component="loginservice")
    记不太清了....你自己查一下
      

  5.   

    你可以尝试把你的那段代码 try 一下试试看。。看try 是否可以把null异常处理掉
      

  6.   

    com.common.action.LoginAction.execute(LoginAction.java:38)
    你可以尝试把你的38行那段代码 try 一下试试看。。看try 是否可以把null异常处理掉
      

  7.   

    应该用@Service("loginService") 和 @Resource(name="loginService")吧，楼主那种方式我没有试过，不过我一直都是用前面说的方式注入的