55.ReentrantReadWriteLock应用于缓存

简单的缓存案例

模拟一个数据层dao

@Slf4j
public class GenericDao {
 
 
    public  T queryOne(Class beanClass, String sql, Object... args) {
        try {
            log.debug("进入数据库查询.....");
 
            Constructor constructor = beanClass.getDeclaredConstructor();
            constructor.setAccessible(true);
            T t = constructor.newInstance();
            Field username = beanClass.getDeclaredField("name");
            Field age = beanClass.getDeclaredField("age");
            username.setAccessible(true);
            age.setAccessible(true);
            username.set(t, "xiaoming");
            age.set(t, 32);
            return t;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
 
    public int update(String sql, Object... args) {
        return 1;
    }
 
}
 
class Student {
    private String name;
    privat