内部对象ID保存在Spring 3中 [英] Inner object id save in Spring 3

问题描述

我想通过休眠方式保存乡村对象，需要保存已保存的区号.我在下拉列表中填充了区域对象.我在春季2编写了类似的代码，但在春季3上不起作用.

I want to save Village object through hibernate where already persisted District id need to be saved. I populated district object in dropdown. I coded similar work in spring 2, but in spring 3 it doesn't work.

在这里，如果我在POST中记录village.getDistrict()，则将id设置为我设置为下拉列表时的完美值，但是District对象的其他值为null.

here, if I log village.getDistrict() in POST, id is set perfectly as I set to dropdown but other value of district object is null.

@SessionAttributes({"village"})
@Controller
public class VillageController{

    @Autowired(required=true)
    private AddressService addressService;



   @RequestMapping(value="/cp/village.html", method = RequestMethod.GET)
    public String setForm(ModelMap model) {

    Village village = new Village();    
    village.setDistrict(new District());

    model.addAttribute("village", village);
    return "/cp/village";
    }
    @ModelAttribute("districtList")
    public List<District> populateDistrictList() {
    return addressService.getDistrictList();
    }



 @RequestMapping(value="/cp/village.html", method = RequestMethod.POST)
    public String getForm(@ModelAttribute("village") Village village,               
                BindingResult result, 
                SessionStatus status) {

    log.debug("============================="+village.getDistrict());

    addressService.saveVillage(village);
    status.setComplete(); 

    return "redirect:/cp/village.html123";
    }
}

在JSP中:

<form:form commandName ="village" action="village.html" >
      <div>
    <label><fmt:message key="location.district"/></label>
    <form:select path="district.id">
      <form:options items="${districtList}" itemValue="id" itemLabel="districtName"/>
    </form:select>
      </div>

      <div>
    <label><fmt:message key="location.village"/></label>
    <form:input path = "villageName" />    
      </div>


      <div>
    <label><fmt:message key="prompt.remarks"/></label>
    <form:textarea path = "remarks" rows="2" cols="50"/>
      </div>


    <div class = "button-area">
      <input type = "submit" value="Save" class="submit-button" />
      <input type = "button" value="Cancel" onclick="window.location='commonComplaintList.html'" class="submit-button" /> 
    </div>

    <br/>
  </form:form>

推荐答案

您没有在District对象中设置任何值，因此它为空.

You do not set any value in the District object, so it is empty.

如果您期望该区域具有来自List<District> populateDistrictList()的对象的值，那么我不得不说:它不能立即使用.

If you expected that the district has the values of objects from List<District> populateDistrictList(), then I have to say: it does not work out of the box.

一种实现方法是实施

One way to do it, would be implementing a Converter, that converts a string (the id) to the District object, by loading it from the database.

这篇关于内部对象ID保存在Spring 3中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！