Spring 3使用JSON處理異常

Question

我有一個Controller，我想向用戶反饋錯誤信息。錯誤回調被執行，但錯誤消息不會被髮送回客戶端。

jQuery的電話：

var validateButton = $('#validateSteps'); 
validateButton.bind('click', function() { 
    var stepsInput = $(':input').serializeArray(); 
    $.postJSON('validate.htm', stepsInput, function(data) { 
     alert(data); 
     var steps = $('#steps'); 
     var i = 0; 
     for(i=0;i<data.length;i++) { 
      steps.stepWidget('setValidationStatus', {testStepId: data[i].testStepId, interactionType: data[i].interactionType, validationStatus: data[i].validationStatus}); 
      steps.stepWidget('setErrorDescriptions', {testStepId: data[i].testStepId, interactionType: data[i].interactionType, errorDescriptions: data[i].errorDescriptions}); 
     } 
     return false; 
    }, { 
      error: function (XMLHttpRequest, textStatus, errorThrown, data) { 
       alert("error function"); 
       alert(textStatus); 
       alert(errorThrown);    
       alert("Internal Server Error: " + data); 
      return false; 
     } 
    }); 
    return false; 
}); 

控制器：

@RequestMapping(value = "validate.htm", method = RequestMethod.POST) 
public @ResponseBody 
List<ValidationBean> validateSteps(
     @RequestBody List<Map<String, String>> testCaseInputs, 
     HttpServletResponse response) throws MalformedMessageException, 
     MalformedProfileException, XmlException, IOException, 
     MissingDependencyException, MessageValidationException { 
    List<ValidationBean> validations = new ArrayList<ValidationBean>(); 
    ... 
    return validations; 
} 

在控制器中的異常處理程序：

@ExceptionHandler(Exception.class) 
public @ResponseBody 
String handleException(Exception e, HttpServletResponse response) { 
    response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR); 
    return e.getMessage(); 
} 

我想展現給用戶的是String應該由handleException方法返回。在error回調中data參數爲undefined。

Answer 1

看看我的反應非常類似的問題：Spring MVC returning JSONS and exception Handling