java 动态修改注解值

最新推荐文章于 2025-05-09 14:03:47 发布

转载最新推荐文章于 2025-05-09 14:03:47 发布 · 452 阅读

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原文链接：http://www.cnblogs.com/wangnanhui/p/10334027.html

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#java #runtime

注解部分
@Retention(RetentionPolicy.RUNTIME)
@Target({ ElementType.METHOD })
@Documented
public @interface Cacheable {

    public enum KeyMode {
        CACHEKEY, 
        BASIC, 
        ALL;
    }
    
    public String prefix() default ""; 

    public String key() default ""; 

    public KeyMode keyMode() default KeyMode.BASIC; 

    public int expire() default  1800; 
}

   修改注解内部值
 @Cacheable(keyMode = KeyMode.ALL)
    public Object cached(final ProceedingJoinPoint pjp) throws Throwable {
        Class<?> cls = CacheProxyBiz.class;
        Method method = cls.getMethod("cached", ProceedingJoinPoint.class); 
        Cacheable cacheable = method.getAnnotation(Cacheable.class);//获取注解
        System.out.println("修改前.....");
        System.out.println("模式" + cacheable.keyMode() + "\t 时长" + cacheable.expire());
        InvocationHandler invocationHandler = Proxy.getInvocationHandler(cacheable);
        Field value = invocationHandler.getClass().getDeclaredField("memberValues");
        value.setAccessible(true);
        Map<String, Object> memberValues = (Map<String, Object>) value.get(invocationHandler);
        memberValues.put("expire", 50);
        System.out.println("修改后.....");
        System.out.println("模式" + cacheable.keyMode() + "\t 时长" + cacheable.expire());
        return "";

    }