spring 用了@@Component和@Resource注入 为什么属性还是空的解决方案

spring 用了@@Component和@Resource注入 为什么属性还是空的
这是我的web.xml

XML code

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"    id="WebApp_ID" version="2.5">        <display-name>SpringMailPhoneService</display-name>    <context-param>        <param-name>contextConfigLocation</param-name>        <param-value>             classpath:/bean.xml        </param-value>    </context-param>    <listener>        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>    </listener>        <welcome-file-list>        <welcome-file>index.html</welcome-file>        <welcome-file>index.htm</welcome-file>        <welcome-file>index.jsp</welcome-file>        <welcome-file>default.html</welcome-file>        <welcome-file>default.htm</welcome-file>        <welcome-file>default.jsp</welcome-file>    </welcome-file-list></web-app>

bean.xml

XML code

<?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:context="http://www.springframework.org/schema/context"    xsi:schemaLocation="http://www.springframework.org/schema/beans         http://www.springframework.org/schema/beans/spring-beans-3.0.xsd         http://www.springframework.org/schema/context         http://www.springframework.org/schema/context/spring-context-3.0.xsd">    <context:annotation-config />    <context:component-scan base-package="com.ums.presys" />    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"        destroy-method="close">        <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver">        </property>        <property name="url" value="jdbc:oracle:thin:@localhost:1521:LEAKEY">        </property>        <property name="username" value="scott"></property>        <property name="password" value="tiger"></property>    </bean>    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">        <property name="dataSource" ref="dataSource"></property>    </bean>    <!--============================== 定时操作 ============================== -->    <bean id="SchedulerFactory"        class="org.springframework.scheduling.quartz.SchedulerFactoryBean">        <property name="triggers">            <list>                <ref bean="searchAndSendTrigger" />            </list>        </property>    </bean>    <bean id="searchAndSendScheduler" class="org.springframework.scheduling.quartz.JobDetailBean">        <property name="jobClass">            <value>com.ums.presys.scheduler.SearchAndSend</value>        </property>    </bean>           <bean id="searchAndSendTrigger" class="org.springframework.scheduling.quartz.CronTriggerBean">        <property name="jobDetail" ref="searchAndSendScheduler"></property>        <property name="cronExpression">            <value>10 17 03 * * ?</value>        </property>    </bean> 
 

debug的时候messageService还是空

Java code

@Componentpublic class SearchAndSend extends QuartzJobBean{    private MessageService messageService;        @Resource    public void setMessageService(MessageService messageService) {        this.messageService = messageService;    }    @Override    protected void executeInternal(JobExecutionContext arg0)            throws JobExecutionException {        messageService.sendMessage();    }}

Java code

@Componentpublic class MessageService {    private MessageDao messageDao;    @Resource    public void setMessageDao(MessageDao messageDao) {        this.messageDao = messageDao;    }        public void sendMessage(){        List<Message> listMessages = messageDao.selectMessages();        for (Message message : listMessages) {            System.out.println(message);        }    }}

[解决办法]
@Resource
private MessageDao messageDao;

[解决办法]
@Resource默认按名字注入，
@Autowair默认按类型注入
[解决办法]
你写反了 @Resource放在上边
@Resource
private MessageService messageService;


[解决办法]
你的MessageDao的实现类有没有加上@Component，MessageService必须写成接口，然后去实现，我记得spring必须是一接口，一实现类
[解决办法]

探讨

引用:
你写反了 @Resource放在上边
@Resource
private MessageService messageService;

不是哦

[解决办法]
控制台出异常没？

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