Web服务中的Spring Autowired不工作

Question

我一定错过了一些简单的东西，但是我很难将Autowired属性分配给bean。这里贴出的所有类似答案似乎都围绕着三种解决方案之一：

null

我试图制作一个最简的bean来表示我的DAO并将其注入到Web服务中。

DAO接口：

package wb;
public interface FooDAO {
    public String doNothing();
}

DAO实现：

package wb;
import org.springframework.stereotype.Component;

@Component
public class FooDAOImpl implements FooDAO {
    public FooDAOImpl() {
        System.out.println("FooDAOImpl: Instantiated " + this);
    }

    @Override
    public String doNothing() {
        System.out.println("FooDAOImpl: doNothing() called");
        return "Did nothing!";
    }
}

package ws;

import javax.jws.WebService;
import javax.jws.WebMethod;
import javax.jws.WebResult;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.context.support.SpringBeanAutowiringSupport;
import wb.FooDAO;

@WebService(serviceName = "WS")
public class WS extends SpringBeanAutowiringSupport {

    @Autowired(required = true)
    private FooDAO fooDAO;

    @WebMethod(exclude = true)
    public void setFooDAO(FooDAO fooDAO) {
        this.fooDAO = fooDAO;
        System.out.println("WS: fooDAO set = " + fooDAO);
    }

    public WS() {
        System.out.println("WS: WS bean instantiated!");
    }

    @WebMethod(operationName = "doNothing")
    @WebResult(name = "whatDidIDo")
    public String doNothing() {
        System.out.println("WS: doNothing() says DAO = " + fooDAO);
        return fooDAO == null ? "Could not do nothing!" : fooDAO.doNothing();
    }
}

<context:annotation-config />
<context:component-scan base-package="ws"/>

<bean id="fooDAO" class="wb.FooDAOImpl" />

11:01:46,767 INFO  [stdout] (MSC service thread 1-6) WS: WS bean instantiated!
11:01:47,571 INFO  [stdout] (MSC service thread 1-15) FooDAOImpl: Instantiated wb.FooDAOImpl@11176682

11:03:07,097 INFO  [stdout] (http--127.0.0.1-8080-1) WS: doNothing() says DAO = null

我错过了什么？

Answer 1

SpringBeanAutowiringSupport必须是bean。您需要使用@service或其他注释（如@component)对该类进行注释，以指示当组件扫描发生时类应该是bean。这些将被spring拾取并制成bean。

请记住，为了成为自动连接的参与者，例如注入另一个bean，类本身必须是一个bean，并由Spring的IOC容器管理。