对象序列化和反序列--Hibernate的查询和新增极其相似

Hibernate几个关键字
持久化，ORM（关系对象映射）（数据库中关系称作是一张表）


应用在项目中，刘一从写的查询代码，每次都挂掉，想要弄出测试数据，自己想着把查询出来的复杂数据弄到文件里
自己要是去造那些复杂数据很麻烦
public class Object1 { ???public static void main(String args[]){ ?????????HashMap<String, Object> obj=new HashMap<String,Object>(); ?????????obj.put("hello","String"); ?????????ArrayList<String> array = new ArrayList<String>(); ?????????array.add("abcdefg"); ?????????writeObjectToFile(array); ?????//将这个瞬时对象写到了磁盘里面了 ????????????ArrayList<String> obj1= ?(ArrayList<String>) readObjectFromFile(); ???????//和hibernate的查询代码极其相似 ???} ???public static ?void writeObjectToFile(Object obj) { ???????File file = new File("D:\\java\\test.dat"); ???????FileOutputStream out; ???????try { ???????????out = new FileOutputStream(file); ???????????ObjectOutputStream objOut = new ObjectOutputStream(out); ???????????objOut.writeObject(obj); ???????????objOut.flush(); ???????????objOut.close(); ???????????System.out.println("write object success!"); ???????} catch (IOException e) { ???????????System.out.println("write object failed"); ???????????e.printStackTrace(); ???????} ???} ???????public static Object readObjectFromFile() { ???????Object temp = null; ???????File file = new File("D:\\java\\test.dat"); ???????FileInputStream in; ???????try { ???????????in = new FileInputStream(file); ???????????ObjectInputStream objIn = new ObjectInputStream(in); ???????????temp = objIn.readObject(); ???????????objIn.close(); ???????????System.out.println("read object success!"); ???????} catch (IOException e) { ???????????System.out.println("read object failed"); ???????????e.printStackTrace(); ???????} catch (ClassNotFoundException e) { ???????????e.printStackTrace(); ???????} ???????return temp; ???}

public static void main(String[] args) { ???????SessionFactory sf = new Configuration().configure().buildSessionFactory(); ???????Session s = sf.openSession(); ???????s.beginTransaction(); ????????????????????Product p = new Product(); ???????p.setName("iphone7"); ???????p.setPrice(1000); ???????s.save(p); ??//将一个内存中的对象转到物理数据库中的一条记录 ???????s.getTransaction().commit(); ???????????????????//根据id查询 ???????Product p4 = (Product)s.get(Product.class,1);

　　　　　　String hql="from Product";
　　　　　　List<Product> list2=(List<Product>) s.createQuery(hql).list();