@Entity 
public class Forder implements java.io.Serializable { 
  
 //省略无关代码…… 
 
 private List<Sorder> sorders = new ArrayList<Sorder>(); 
 
 @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "forder") 
 public List<Sorder> getSorders() { 
  return this.sorders; 
 } 
 
 public void setSorders(List<Sorder> sorders) { 
  this.sorders = sorders; 
 } 
} 
 
@Entity 
public class Sorder implements java.io.Serializable { 
 
 //省略无关代码…… 
 
 private Forder forder; 
 
 @ManyToOne(fetch = FetchType.LAZY) 
 @JoinColumn(name = "fid") 
 public Forder getForder() { 
  return this.forder; 
 } 
 
 public void setForder(Forder forder) { 
  this.forder = forder; 
 } 
} 

//这是17节中的代码，我们在中间插上一句 
@Service("sorderService") 
public class SorderServiceImpl extends BaseServiceImpl<Sorder> implements 
  SorderService { 
 
 @Override 
 public Forder addSorder(Forder forder, Product product) { 
  boolean isHave = false; //用来标记有没有重复购物项 
  //拿到当前的购物项 
  Sorder sorder = productToSorder(product); 
  //判断当前购物项是否重复，如果重复，则添加数量即可 
  for(Sorder old : forder.getSorders()) { 
   if(old.getProduct().getId().equals(sorder.getProduct().getId())) { 
    //购物项有重复，添加数量即可 
    old.setNumber(old.getNumber() + sorder.getNumber()); 
    isHave = true; 
    break; 
   } 
  } 
  //当前购物项在购物车中不存在，新添加即可 
  if(!isHave) { 
      //我们在这里插入一句： 
   //在向购物中添加购物项之前，先建立购物项与购物车的关联，但是此时forder.id为null， 
   //但是在入库的时候是先入库购物车，再入库购物项，那时候就有主键了 
   sorder.setForder(forder); 
   forder.getSorders().add(sorder); 
  } 
   
  return forder; 
 } 
 
 @Override 
 public Sorder productToSorder(Product product) { 
  Sorder sorder = new Sorder(); 
  sorder.setName(product.getName()); 
  sorder.setNumber(1); 
  sorder.setPrice(product.getPrice()); 
  sorder.setProduct(product); 
  return sorder; 
 } 
} 

@Controller("forderAction") 
@Scope("prototype") 
public class ForderAction extends BaseAction<Forder> { 
  
 @Override 
 public Forder getModel() { 
  model = (Forder) session.get("forder"); 
  return model; 
 } 
 
 //实现购物车（订单）与购物项（订单项）级联入库功能 
 public String save() { 
//  // 把session中的购物项交给当前的model对象 
//  Forder forder = (Forder) session.get("forder"); 
//  //model.setSorders(forder.getSorders()); 
//  forder.setAddress(model.getAddress()); 
//  forder.setName(model.getName()); 
//  forder.setPhone(model.getPhone()); 
//  forder.setRemark(model.getRemark()); 
//  forder.setUser((User)session.get("user")); 
//  forder.setStatus(new Status(1)); 
//  forder.setPost(model.getPost()); 
//  //级联入库(需要在xml或者POJO的注解中配置)，需要sorder关联forder 
//  //在SorderServiceImpl类中追加sorder.setForder(forder); 
//  forderService.save(forder); 
   
  model.setUser((User)session.get("user")); 
  model.setStatus(new Status(1)); 
  forderService.save(model); 
   
  return "bank"; 
 } 
} 

@Controller("forderAction") 
@Scope("prototype") 
public class ForderAction extends BaseAction<Forder> { 
  
 @Override 
 public Forder getModel() { 
  model = (Forder) session.get("forder"); 
  return model; 
 } 
 
 //实现购物车（订单）与购物项（订单项）级联入库功能 
 public String save() { 
//  // 把session中的购物项交给当前的model对象 
//  Forder forder = (Forder) session.get("forder"); 
//  //model.setSorders(forder.getSorders()); 
//  forder.setAddress(model.getAddress()); 
//  forder.setName(model.getName()); 
//  forder.setPhone(model.getPhone()); 
//  forder.setRemark(model.getRemark()); 
//  forder.setUser((User)session.get("user")); 
//  forder.setStatus(new Status(1)); 
//  forder.setPost(model.getPost()); 
//  //级联入库(需要在xml或者POJO的注解中配置)，需要sorder关联forder 
//  //在SorderServiceImpl类中追加sorder.setForder(forder); 
//  forderService.save(forder); 
   
  model.setUser((User)session.get("user")); 
  model.setStatus(new Status(1)); 
  forderService.save(model); 
   
  //此时购物车已经入库，那么原来session中的购物车就应该清空 
  session.put("oldForder", session.get("forder"));//先将原来的购物车信息保存下来，因为后面付款的时候还需要相关信息 
  session.put("forder", new Forder());//new一个新的空购物车（相当于清空了购物车），还可以方便用户再买~ 
  return "bank"; 
 } 
}