controller 层参数邦定
在前端页面传递id 后端想用receiveId 接收时 需要用到
- 需取的接收 request.getParameter()
// 需取的接收 request.getParameter()
@RequestMapping(value = "/itemEdit.action")
public ModelAndView toEdit(
HttpServletRequest request,
HttpServletResponse response,
Model model){
//Servlet时代开发
String id = request.getParameter("id");
//查询一个商品
Items items = itemService.selectItemsById(Integer.parseInt(id));
ModelAndView mav = new ModelAndView();
//数据
mav.addObject("item", items);
mav.setViewName("editItem");
return mav;
}
- 前后端字段对不上
// 更改后接收
@RequestMapping(value = "/itemEdit.action")
public ModelAndView toEdit(
@RequestParam(value = "id",required = false,defaultValue = "1") Integer receiveId,
HttpServletResponse response,
HttpSession session,
Model model){
//查询一个商品
Items items = itemService.selectItemsById(id);
ModelAndView mav = new ModelAndView();
//数据
mav.addObject("item", items);
mav.setViewName("editItem");
return mav;
}
// @RequestParam(value = "id",required = false,defaultValue = "1")
// value = "id" 接受到前端法的的字段
// required 改字段是否必须 ,默认必须
// defaultValue = "1" 默认值在分页时,前端不传值的情况下默认第一页
- 可以直接接收
// 直接接收
@RequestMapping(value = "/itemEdit.action")
public ModelAndView toEdit(
Integer id,
HttpServletRequest request,
HttpServletResponse response,
Model model){
//查询一个商品
Items items = itemService.selectItemsById(id);
ModelAndView mav = new ModelAndView();
//数据
mav.addObject("item", items);
mav.setViewName("editItem");
return mav;
}
- pojo 类型接收
// i
public void updateItemsById(Items items);
// impl
public void updateItemsById(Items items){
items.setCreatetime(new Date());
itemsMapper.updateByPrimaryKeyWithBLOBs(items);
// controller
//提交修改页面 入参 为 Items对象
@RequestMapping(value = "/updateitem.action")
public ModelAndView updateitem(Items items){
itemService.updateItemsById(vo.getItems());
ModelAndView mav = new ModelAndView();
mav.setViewName("success");
return mav;
}
- 包装类型接收
// 1、
public class Items {
private Integer id;
private String name;
private Float price;
private String pic;
private Date createtime;
private String detail;
// 略...
}
//2、 包装类型绑定数据
public class QueryVo {
//商品
private Items items;
Integer[] ids;
private List<Items> itemsList;
// 略...
}
//3、 controller层
/**
* 前端传递 item.id,item.
*/
//提交修改页面 入参 为 Items对象
@RequestMapping(value = "/updateitem.action")
// public ModelAndView updateitem(Items items){
public String updateitem(QueryVo vo){
//修改
itemService.updateItemsById(vo.getItems());
ModelAndView mav = new ModelAndView();
mav.setViewName("success");
return mav;
}
// 4、service 层
// 接口
public interface ItemService {
//查询商品列表
public List<Items> selectItemsList();
public Items selectItemsById(Integer id);
//修改
public void updateItemsById(Items items);
}
// impl
public class ItemServiceImpl implements ItemService {
@Autowired
private ItemsMapper itemsMapper;
//查询商品列表
public List<Items> selectItemsList(){
return itemsMapper.selectByExampleWithBLOBs(null);
}
public Items selectItemsById(Integer id){
return itemsMapper.selectByPrimaryKey(id);
}
//修改
public void updateItemsById(Items items){
items.setCreatetime(new Date());
itemsMapper.updateByPrimaryKeyWithBLOBs(items);
}
}