設定使用形式和控制器

Question

在一個Spring MVC應用程序中使用的休眠的實體屬性，我當用戶試圖指定（實體是FacilityAddress）的location一個appointment（實體是Encounter）使用JSP遇到錯誤。具體而言，需要由JSP設置屬性Encounter.location。可能的位置列表通過模型屬性praddrs提供給用戶，該屬性通過控制器中的GET方法正確填充到JSP表單中。

有人可以告訴我如何讓這個功能正常工作，而不會引發錯誤嗎？

我可以創建400 error當我下面的代碼行添加到我的JSP：

<form:select path="location" items="${praddrs}" size="3" style="min-width:200px"/> 

的400 error狀態：

The request sent by the client was syntactically incorrect. 

有一個在Eclipse控制檯沒有堆棧跟蹤。

我已經閱讀了一些其他的堆棧溢出發貼，並已完成谷歌搜索與修補我的代碼，但我似乎無法隔離我的獨特情況的解決方案。有人能告訴我如何克服這個錯誤嗎？

這裏是在JSP形式：

<form:form modelAttribute="encounter" method="${method}" class="form-horizontal"> 
    <div class="control-group" id="patient"> 
     <label class="control-label">Patient </label> 
     <c:out value="${encounter.patient.firstName} ${encounter.patient.lastName}"/> 
    </div> 
    <div class="control-group" id="datetime"> 
     <label class="control-label">Date and Time </label> 
     <joda:format value="${encounter.dateTime}" style="SM"/> 
    </div> 

    <div class="control-group"> 
     <label class="control-label">Office</label> 
     <form:select path="location" items="${praddrs}" size="3" style="min-width:200px"/> 
    </div> 

    <petclinic:inputField label="Duration (mins)" name="numMins"/> 

    <td> 
    </td> 
    <div class="form-actions"> 
     <c:choose> 
      <c:when test="${encounter['new']}"> 
       <button type="submit">Add Encounter</button> 
      </c:when> 
      <c:otherwise> 
       <button type="submit">Update Encounter</button> <h3> Link to delete will go here.</h3> 
      </c:otherwise> 
     </c:choose> 
    </div> 
</form:form> 

這裏是用於處理POST這個JSP控制器方法：

//THIS IS THE METHOD THAT HANDLES THE FORM 
@RequestMapping(value = "/patients/{patientId}/encounters/new", method = RequestMethod.POST) 
public String processCreationForm(@ModelAttribute("encounter") Encounter encounter, @RequestParam("providerId") int providerId, BindingResult result, SessionStatus status) { 
    System.out.println("inside processCreationForm() "); 
    System.out.println("encounter.getDateTime() is: "+encounter.getDateTime()); 
    new EncounterValidator().validate(encounter, result); 
    Provider myprovider = this.clinicService.findProviderById(providerId); 
    encounter.addProvider(myprovider); 
    if (result.hasErrors()) { 
     System.out.println("about to return errors. "); 
     return "encounters/createOrUpdateEncounterForm"; 
    } else { 
     System.out.println("about to save encounter "); 
     this.clinicService.saveEncounter(encounter); 
     System.out.println("done saving encounter."); 
     status.setComplete(); 
     System.out.println("finished status.setComplete()"); 
     return "redirect:/encounters?encounterID={encounterId}"; 
    } 
} 

作爲參考，用於處理控制器方法JSP的GET是：

@RequestMapping(value = "/patients/{patientId}/encounters/new", method = RequestMethod.GET) 
public String initCreationForm(@PathVariable("patientId") int patientId, @RequestParam("providerId") int prid, org.springframework.web.context.request.WebRequest webRequest, Map<String, Object> model) { 
    Patient patient = this.clinicService.findPatientById(patientId); 
    LocalDate theday = new LocalDate(webRequest.getParameter("day")); 
    LocalTime thetime = new LocalTime(webRequest.getParameter("time")); 
    DateTime thedatetime = theday.toDateTime(thetime); 
    this.clinicService.findFacilityAddressByProviderId(prid); 
    Encounter encounter = new Encounter(); 
    encounter.setDateTime(thedatetime); 
    patient.addEncounter(encounter); 
    ArrayList<FacilityAddress> praddrs = (ArrayList<FacilityAddress>) this.clinicService.findFacilityAddressByProviderId(prid); 
    Provider pr = clinicService.findProviderById(prid); 
    model.put("encounter", encounter); 
    model.put("praddrs", praddrs); 
    model.put("pr", pr); 
    return "encounters/createOrUpdateEncounterForm"; 
} 

我已發佈了將實體代碼添加到文件共享網站，以便可以更輕鬆地閱讀此郵件。您可以通過點擊以下鏈接閱讀實體代碼：

Encounter實體代碼可以被讀取at this link。
FacilityAddress實體代碼可以被讀取at this link。
BaseEntity代碼可以被讀取爲at this link。

Answer 1

如何將「位置」更改爲「location.id」？

<form:select path="location.id" items="${praddrs}" size="3" style="min-width:200px"/>