springboot获取类指定注解的方法

此处以@xxlJob注解举例

**1、实现 SmartInitializingSingleton, ApplicationContextAware **

2、MethodIntrospector.selectMethods()获取类方法

@Configuration
public class XxlJobConfig implements SmartInitializingSingleton, ApplicationContextAware {

    private Logger logger = LoggerFactory.getLogger(XxlJobConfig.class);

    private ApplicationContext applicationContext;

    @Value("${xxl.job.admin.addresses}")
    private String adminAddresses;

    @Value("${xxl.job.accessToken}")
    private String accessToken;

    @Value("${xxl.job.executor.appname}")
    private String appname;

    @Value("${xxl.job.executor.address}")
    private String address;

    @Value("${xxl.job.executor.ip}")
    private String ip;

    @Value("${xxl.job.executor.port}")
    private int port;

    @Value("${xxl.job.executor.logpath}")
    private String logPath;

    @Value("${xxl.job.executor.logretentiondays}")
    private int logRetentionDays;


    @Bean
    public XxlJobSpringExecutor xxlJobExecutor() {
        logger.info(">>>>>>>>>>> xxl-dispatch config init.");
        XxlJobSpringExecutor xxlJobSpringExecutor = new XxlJobSpringExecutor();
        xxlJobSpringExecutor.setAdminAddresses(adminAddresses);
        xxlJobSpringExecutor.setAppname(appname);
        xxlJobSpringExecutor.setAddress(address);
        xxlJobSpringExecutor.setIp(ip);
        xxlJobSpringExecutor.setPort(port);
        xxlJobSpringExecutor.setAccessToken(accessToken);
        xxlJobSpringExecutor.setLogPath(logPath);
        xxlJobSpringExecutor.setLogRetentionDays(logRetentionDays);

        return xxlJobSpringExecutor;
    }

    @Override
    public void afterSingletonsInstantiated() {
        String[] beanNamesForType = applicationContext.getBeanNamesForType(Object.class, false, false);
        for (String s : beanNamesForType) {
            Object bean = applicationContext.getBean(s);
            Map<Method, XxlJob> selectMethods = MethodIntrospector.selectMethods(bean.getClass(), (MethodIntrospector.MetadataLookup<XxlJob>) method -> {
                return AnnotatedElementUtils.findMergedAnnotation(method, XxlJob.class);
            });
            if (MapUtil.isEmpty(selectMethods)) {
                continue;
            }
            for (Map.Entry<Method, XxlJob> entry : selectMethods.entrySet()) {
                XxlJob value = entry.getValue();
                Method key = entry.getKey();
                xxlJobMap.put(value.value(), key);
            }
        }
    }

    private ConcurrentHashMap<String, Method> xxlJobMap = new ConcurrentHashMap<>();

    @Override

    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }
}