springboot使用反射后@Autowired 失效问题解决

比眉伴天荒 2023-09-23 13:40 132阅读 0赞

**我写在注释里面了,看看能不能看懂**

//通过反射获得类对象,注意不能 new 否则为空
      Class<?> aClass = Class.forName("com.seven.handlers." + s);
    String simpleName = aClass.getSimpleName();
    //类名前缀大写转换
    String firstLowerName  = simpleName.substring(0, 1).toLowerCase() + simpleName.substring(1);
                    /**
                     * 只会扫描带@Component注解的
                     */
    Object obj = MianMianApplication.SpringContextUtil.getBean(firstLowerName, aClass);
              此时的OBj就是咱们想要的反射

配置文件如下

@Component
        @Lazy(value=false)
        public static class SpringContextUtil implements ApplicationContextAware {
        
            // Spring应用上下文环境
            private static ApplicationContext applicationContext;
            /**
             * Spring容器启动后，会把 applicationContext 给自动注入进来，然后我们把 applicationContext 赋值到静态变量中，方便后续拿到容器对象
             */
            @Override
            public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        
                SpringContextUtil.applicationContext = applicationContext;
            }
            /**
             * @return ApplicationContext
             */
            public static ApplicationContext getApplicationContext() {
        
                return applicationContext;
            }
            /**
             * 获取对象
             *
             * @param name
             * @return Object
             * @throws BeansException
             */
            public static Object getBean(String name) throws BeansException {
        
                return applicationContext.getBean(name);
            }
            public static Object getBean(String name, Class cla) throws BeansException {
        
                return applicationContext.getBean(name, cla);
            }
        }