Spring 之@Autowired注入集合类List、Set、Map

首先创建一个接口和两个实现类：

public interface BeanInterface {
}

@Component
public class BeanImplOne implements BeanInterface {
}

@Component
public class BeanImplTwo implements BeanInterface {
}

下面将这两个实现类实例注入到集合中：

@Component
public class BeanInvoke {
    @Autowired
    private List<BeanInterface> beanInterfaceList;
    @Autowired
    private Map<String, BeanInterface> beanInterfaceMap;
    @Autowired
    private Set<BeanInterface> beanInterfaceSet;

    public void say() {
        System.out.println("list...");
        if (null != beanInterfaceList && 0 != beanInterfaceList.size()) {
            for (BeanInterface bean : beanInterfaceList) {
                System.out.println(bean.getClass().getName());
            }
        }
        System.out.println("map...");
        if (null != beanInterfaceMap && 0 != beanInterfaceMap.size()) {
            for (Map.Entry<String, BeanInterface> m : beanInterfaceMap.entrySet()) {
                System.out.println(m.getKey() + "    " + m.getValue().getClass().getName());
            }
        }
        System.out.println("set...");
        if (null != beanInterfaceSet && 0 != beanInterfaceSet.size()) {
            for (BeanInterface bean : beanInterfaceSet) {
                System.out.println(bean.getClass().getName());
            }
        }
    }
}

测试：

@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringBootDemoApplicationTests {

    @Autowired
    BeanInvoke beanInvoke;

    @Test
    public void test1(){
        beanInvoke.say();
    }
}

结果：
list...
com.demo.spring.BeanImplOne
com.demo.spring.BeanImplTwo
map...
beanImplOne    com.demo.spring.BeanImplOne
beanImplTwo    com.demo.spring.BeanImplTwo
set...
com.demo.spring.BeanImplOne
com.demo.spring.BeanImplTwo

看到已经将两个实例注入到集合中了。