@Entity 
public class Forder implements java.io.Serializable { 
  
 //省略無關(guān)代碼…… 
 
 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 { 
 
 //省略無關(guān)代碼…… 
 
 private Forder forder; 
 
 @ManyToOne(fetch = FetchType.LAZY) 
 @JoinColumn(name = "fid") 
 public Forder getForder() { 
  return this.forder; 
 } 
 
 public void setForder(Forder forder) { 
  this.forder = forder; 
 } 
} 

//這是17節(jié)中的代碼，我們在中間插上一句 
@Service("sorderService") 
public class SorderServiceImpl extends BaseServiceImpl<Sorder> implements 
  SorderService { 
 
 @Override 
 public Forder addSorder(Forder forder, Product product) { 
  boolean isHave = false; //用來標(biāo)記有沒有重復(fù)購物項 
  //拿到當(dāng)前的購物項 
  Sorder sorder = productToSorder(product); 
  //判斷當(dāng)前購物項是否重復(fù)，如果重復(fù)，則添加數(shù)量即可 
  for(Sorder old : forder.getSorders()) { 
   if(old.getProduct().getId().equals(sorder.getProduct().getId())) { 
    //購物項有重復(fù)，添加數(shù)量即可 
    old.setNumber(old.getNumber() + sorder.getNumber()); 
    isHave = true; 
    break; 
   } 
  } 
  //當(dāng)前購物項在購物車中不存在，新添加即可 
  if(!isHave) { 
      //我們在這里插入一句： 
   //在向購物中添加購物項之前，先建立購物項與購物車的關(guān)聯(lián)，但是此時forder.id為null， 
   //但是在入庫的時候是先入庫購物車，再入庫購物項，那時候就有主鍵了 
   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; 
 } 
 
 //實(shí)現(xiàn)購物車（訂單）與購物項（訂單項）級聯(lián)入庫功能 
 public String save() { 
//  // 把session中的購物項交給當(dāng)前的model對象 
//  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()); 
//  //級聯(lián)入庫(需要在xml或者POJO的注解中配置)，需要sorder關(guān)聯(lián)forder 
//  //在SorderServiceImpl類中追加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; 
 } 
 
 //實(shí)現(xiàn)購物車（訂單）與購物項（訂單項）級聯(lián)入庫功能 
 public String save() { 
//  // 把session中的購物項交給當(dāng)前的model對象 
//  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()); 
//  //級聯(lián)入庫(需要在xml或者POJO的注解中配置)，需要sorder關(guān)聯(lián)forder 
//  //在SorderServiceImpl類中追加sorder.setForder(forder); 
//  forderService.save(forder); 
   
  model.setUser((User)session.get("user")); 
  model.setStatus(new Status(1)); 
  forderService.save(model); 
   
  //此時購物車已經(jīng)入庫，那么原來session中的購物車就應(yīng)該清空 
  session.put("oldForder", session.get("forder"));//先將原來的購物車信息保存下來，因?yàn)楹竺娓犊畹臅r候還需要相關(guān)信息 
  session.put("forder", new Forder());//new一個新的空購物車（相當(dāng)于清空了購物車），還可以方便用戶再買~ 
  return "bank"; 
 } 
}