java 自定义注解的Demo

• 1. 创建注解

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface Key {
    public String name() default "";
}

• 2. 使用注解

@Key(name = "Description")
private String description;

• 3. 业务逻辑实现

// 利用反射获取注解实现个性化业务
 Field[] fields = getEntityClass().getDeclaredFields();
 for (int j = 0; j < fields.length; j++) {
     Field _field = fields[j];
     Key attr = _field.getAnnotation(Key.class);
     if (attr != null) {
         keys.add(attr.name());
     }
 }