55.ReentrantReadWriteLock应用于缓存

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简单的缓存案例

模拟一个数据层dao

@Slf4j
public class GenericDao {public <T> T queryOne(Class<T> beanClass, String sql, Object... args) {try {log.debug("进入数据库查询.....");Constructor<T> 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

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