java - Spring Autowiring 不起作用

Question

我有以下类，并且仅在使用 ctx.getBean() 时才可以使用注释为 @Component 的类。但我想知道下面的情况。

1. 为什么注释@autowired不起作用。

2. 我在 PathVerifier 处收到错误，因为它是接口(interface)并遵循工厂模式。实际的实现对象只会知道运行时的正确性。因此，我为 PathVerifier 接口(interface)的所有实现添加了 @Component。

我的上下文文件中有以下内容:

 <context:annotation-config />  
    <context:component-scan base-package="com.xxx.xxx.process">
 </context:component-scan>

我的主要类(class)如下:

@Component("verifier")
public class Verifier { 

    private static final Logger log = LoggerFactory.getLogger(Verifier.class);

    @Autowired
    private static PathVerifierFactory pathVerifierFactory;
    private static PathVerifer pathVerifier;

    public AutogenPathInfo getXMLPathData() throws Exception {

        ApplicationContext ctx = new ClassPathXmlApplicationContext("context.xml");
        FileInputParser parser = (FileInputParser) ctx.getBean("fileParser");
        pathVerifierFactory=(PathVerifierFactory) ctx.getBean("pathVerifierFactory");
        //pathVerifier=(PathVerifer) ctx.getBean("pathVerifer");
        return parser.process();
    }

    public List<Paths> splitXMLData(AutogenPathInfo pathInfo, String pathTypeId) {

        List<Paths> pathsList = new ArrayList<Paths>();
        List<Paths> pathTypes = pathInfo.getPaths();

        System.out.println("Size of 'Paths' :" + pathTypes.size());
        Iterator<Paths> pathsItr = pathTypes.iterator();

        int typeICnt = 0;

        while (pathsItr != null && pathsItr.hasNext()) {

            Paths paths = pathsItr.next();

            if (paths.getTypeid().equalsIgnoreCase(pathTypeId)) {
                pathsList.add(paths);

            }
            continue;

        }
        System.out.println("total Path types " + typeICnt);
        return pathsList;

    }

    public void verifyPathInfo() throws Exception {
        AutogenPathInfo autogenPathInfo=null;

        autogenPathInfo = getXMLPathData();

        List<String> pathIdList = getPathTypeIds(autogenPathInfo);

        if(pathIdList!=null)
        System.out.println("Size of Paths Element in XML : "+pathIdList.size());

        if(pathVerifierFactory==null){
            log.debug("pathVerifierFactory is null");           
        }

        for(String pathId: pathIdList) {
            List<Paths> pathList = splitXMLData(autogenPathInfo, pathId);
            PathVerifer pathVerifierObj = pathVerifierFactory.getPathVerifier(pathId);

            if(pathVerifierObj==null){
                log.debug("pathVerifierObj is null");           
            }

            pathVerifierObj.verifyPaths(pathList);          
        }

    } 

    private List<String> getPathTypeIds(AutogenPathInfo autogenPathInfo) {

        List<String> typeIdList=new ArrayList<String>();

        List<Paths> pathsList = autogenPathInfo.getPaths();
        Iterator<Paths> pathListIterator = pathsList.iterator();
        while(pathListIterator!=null && pathListIterator.hasNext()){

            Paths paths =  pathListIterator.next();
            if(!StringUtils.isBlank(paths.getTypeid())){
                typeIdList.add(paths.getTypeid().trim());

            }
        }
        List<String> distinctPathIdList = new ArrayList<String>(new HashSet<String>(typeIdList));
        return distinctPathIdList;

    }

}

Answer 1

静态字段无法 Autowiring 。

You cannot autowire or manually wire static fields in Spring. You'll have to write your own logic to do this

。尝试从变量中删除 static 修饰符。

check this out

更新

您可以 Autowiring 实现对象列表，如下所示。

<bean id="stage1" class="Stageclass"/>
<bean id="stage2" class="Stageclass"/>

<bean id="stages" class="java.util.ArrayList">
    <constructor-arg>
        <list>
            <ref bean="stage1" />
            <ref bean="stage2" />                
        </list>
    </constructor-arg>
</bean>

因此将实现注入(inject)工厂以避免有 N @Autowired 注释