Spring注入static属性

转载自：https://blog.youkuaiyun.com/z69183787/article/details/25365873

第一种方法:

@Component
public class UserUtils {
    private static UserAccessor userAccessor;

    @Autowired(required = true)
    public void setUserAccessor(UserAccessor userAccessor) {
        UserUtils.userAccessor = userAccessor;
    }

    public static void deal(){
        userAccessor.sys();
    }
}

第二种方法:

@Component
public class UserUtils {
    private static UserAccessor userAccessor;

    @Autowired(required = true)
    public UserUtils(UserAccessor userAccessor) {
         UserUtils.userAccessor = userAccessor;
    }

    public static void deal(){
        userAccessor.sys();
    }
}

第三种方法:

@Component
public class UserUtils {

    private static UserUtils userUtils;

    @Autowired
    private  UserAccessor userAccessor;

    @PostConstruct
    public void init() {
        userUtils = this;
        userUtils.userAccessor = this.userAccessor;
    }

    public static void deal(){
        userUtils.userAccessor.sys();
    }
}

第四种方法:

@Component
public class ContextProvider implements ApplicationContextAware {

    private static ApplicationContext CONTEXT;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        ContextProvider.CONTEXT = applicationContext;
    }

    public static <T> T getBean(Class<T> beanClass) {
        return ContextProvider.CONTEXT.getBean(beanClass);
    }

    public static <T> T getBean(String beanName) {
        return (T)ContextProvider.CONTEXT.getBean(beanName);
    }
}

@Component
public class UserUtils {
    private static UserAccessor userAccessor = 
        ContextProvider.getBean(UserAccessor.class);

    public static void deal(){
        userAccessor.sys();
    }
}