通过反射获取泛型的实际类型

import java.io.Serializable;
import java.lang.reflect.ParameterizedType;
import org.hibernate.Session;
import cn.itcast.domain.Category;

//T extends Serializable & Cloneable   限定处理的类型
public class BaseDao<T extends Serializable & Cloneable> {

private Session session;
private Class clazz;

public BaseDao(){
ParameterizedType pt = (ParameterizedType) this.getClass().getGenericSuperclass();//BaseDao<Category>
clazz = (Class) pt.getActualTypeArguments()[0]; //获取参数化后的实际类型
}

public void add(T t){
session.save(t);
}

public T find(String id){
return (T) session.get(clazz,id);
}

public void update(T t){
session.update(t);
}

public void delete(String id){
T t = (T) session.get(clazz,id);
session.delete(t);
}

}