Spring 初始化控制器类中的错误接口

Question

我在项目中运行的某些验证时遇到问题。我正在尝试验证我在控制器中创建的对象中的一些参数，首先接收一个字符串。

@RequestMapping(value = "/publicar", method = { RequestMethod.GET, RequestMethod.POST }, produces = MediaType.APPLICATION_XML_VALUE)
@ResponseBody
public ApiPubPortalPublicarOut publicar(@RequestParam(value = PARAM_XML) String xml, Locale locale) {
//This object is my return, it creates an XML with the validation.
ApiPubPortalPublicarOut xmlTaxOut = new ApiPubPortalPublicarOut();
Errors result = null; //Here is the problem
//validate incoming xml is empty
if ((xml == null) || (xml.length() == 0)) {
xmlTaxOut.setDescription("xml is Empty!");
return xmlTaxOut;
}else{
try{
//I transform the xml into an object
JAXBContext jc = JAXBContext.newInstance(ApiPubPortalPublicarPortal.class);
Unmarshaller unmarshaller = jc.createUnmarshaller();
StreamSource streamSource = new StreamSource(new StringReader(xmlEntrada));
JAXBElement<ApiPubPortalPublicarPortal> je = unmarshaller.unmarshal(streamSource, ApiPubPortalPublicarPortal.class);
//Here is the validation method.
parsingPublicacion(je.getValue(), result, locale);
if(result.hasErrors()){
xmlTaxOut.setDescription(result.getAllErrors().toString());
return xmlTaxOut;
}
}catch(Exception){
xmlTaxOut.setDescription("Error parsing!");
return xmlTaxOut;
}
}
}

这是我的控制器，如您所见，我尝试将字符串转换为对象，然后调用方法parsingPublicacion以进行验证。

主要问题是我无法初始化我的Errors参数，因为它是一个接口，有人知道我如何管理此验证吗？

这是mi验证器方法。

private void parsingPublicacion(ApiPubPortalPublicarPortal portalPublicado,  Errors e, Locale locale) {
ApiPubPortalPublicarPortal pubPortal = portalPublicado;
ValidationUtils.rejectIfEmptyOrWhitespace(e, "name", "name.empty"));
if (pubPortal.getNombre().length() > 50){
e.rejectValue("name", "name.oversize");
}
ValidationUtils.rejectIfEmptyOrWhitespace(e, "idLanguage.empty");
if ((pubPortal.getIdPortal() == 0)){
e.rejectValue("idLanguage", "idLanguage.zero"));
}
}

我无法从该方法调用 Errors，因为我只允许在控制器中调用特定的参数。

Answer 1

Edit 2 由于您没有模型属性，因此需要使用实现 Errors 的具体类。BeanPropertyBindingResult 就是这样一种。

你可以使用BeanPropertyBindingResult如下

@RequestMapping(value = "/publicar", method = { RequestMethod.GET, RequestMethod.POST }, produces = MediaType.APPLICATION_XML_VALUE)
@ResponseBody
public ApiPubPortalPublicarOut publicar(@RequestParam(value = PARAM_XML) String xml, Locale locale) {
//This object is my return, it creates an XML with the validation.
ApiPubPortalPublicarOut xmlTaxOut = new ApiPubPortalPublicarOut();

//validate incoming xml is empty
if ((xml == null) || (xml.length() == 0)) {
xmlTaxOut.setDescription("xml is Empty!");
return xmlTaxOut;
}else{
try{
//I transform the xml into an object
JAXBContext jc = JAXBContext.newInstance(ApiPubPortalPublicarPortal.class);
Unmarshaller unmarshaller = jc.createUnmarshaller();
StreamSource streamSource = new StreamSource(new StringReader(xmlEntrada));
JAXBElement<ApiPubPortalPublicarPortal> je = unmarshaller.unmarshal(streamSource, ApiPubPortalPublicarPortal.class);
// Using concrete implementation of error interface
BeanPropertyBindingResult result = new BeanPropertyBindingResult(je.getValue(), "apiPubPortal");

//Here is the validation method.
parsingPublicacion(je.getValue(), result, locale);
if(result.hasErrors()){
xmlTaxOut.setDescription(result.getAllErrors().toString());
return xmlTaxOut;
}
}catch(Exception){
xmlTaxOut.setDescription("Error parsing!");
return xmlTaxOut;
}
}
}

编辑 1 您也可以使用错误接口作为方法参数。Spring仍将填充一个实现。

使用 BindigResults 作为方法参数，并在错误位置使用它。Spring 会自动为您填充一个实现。

@RequestMapping(value = "/publicar", method = { RequestMethod.GET, RequestMethod.POST }, produces = MediaType.APPLICATION_XML_VALUE)
@ResponseBody
public ApiPubPortalPublicarOut publicar(@RequestParam(value = PARAM_XML) String xml,
BindingResult result, Locale locale) {
//This object is my return, it creates an XML with the validation.
ApiPubPortalPublicarOut xmlTaxOut = new ApiPubPortalPublicarOut();
// Use BindingResult in places of erros

}

BindingResult扩展了错误，因此您将在其中具有错误功能。

https://docs.spring.io/spring/docs/current/spring-framework-reference/web.html#mvc-ann-arguments

Answer 2

You can Binding Result & FieldErrors instead of Errors. Please find the below code.
private void parsingPublicacion(ApiPubPortalPublicarPortal portalPublicado,  BindingResult bindingResult, Locale locale) {
ApiPubPortalPublicarPortal pubPortal = portalPublicado;
String[] codes = {"errorCode"};
ValidationUtils.rejectIfEmptyOrWhitespace(e, "name", "name.empty"));
if (pubPortal.getNombre().length() > 50){
e.rejectValue("name", "name.oversize");
bindingResult.addError(new FieldError(Yourclass.getSimpleName(),"Name", pubPortal.getNombre(), false , codes , null , "name.oversize"));
}
ValidationUtils.rejectIfEmptyOrWhitespace(e, "idLanguage.empty");
if ((pubPortal.getIdPortal() == 0)){
e.rejectValue("idLanguage", "idLanguage.zero"));
bindingResult.addError(new `enter code here`FieldError(Yourclass.getSimpleName(),"idLanguage", pubPortal.getIdPortal(), false , codes , null , "idLanguage.zero"));
}
}