地图行为的Spring自动生成

Question

@Component
public class SpringMapParent {
    @Autowired
    @Qualifier("theMap")
    private Map<String, Object> theMap;

    ...
}

@Configuration
@ComponentScan
public class SpringMapConfiguration {

    @Bean("theMap")
    public Map<String, Object> getTheMap() {
        Map<String, Object> theMap = new HashMap<String, Object>();
        return theMap;
    }

    ...
}

@ContextConfiguration(classes = {SpringMapConfiguration.class})
@RunWith(SpringJUnit4ClassRunner.class)
public class SpringMapIT {

    @Autowired
    private SpringMapParent springMapParent;

    @Test
    public void testSpringMapParentAutowiredCorrectly() {
        Map<String, Object> theMap = springMapParent.getTheMap();
        assertEquals(0, theMap.size());
    }
}

{theMap={}}

Answer 1

map上的@autowired正在以特定方式处理。文件上说：

即使是类型化的映射，只要预期的键类型是String，也可以自动连线。Map值将包含预期类型的所有bean，键将包含相应的bean名称

文件的另一部分说：

@Component
public class SpringMapParent {
    @Resource
    @Qualifier("theMap")
    private Map<String, Object> theMap;

    ...
}