上传文件抛出没有方法异常的签名（在 getFile() 方法中）

Question

我正在尝试上传文件，并将其存储在文件中。这是 GSP 中的代码：

<g:form method="post" enctype="multipart/form-data"  action="update">
<input type="file" name="cv" id="cv"/>
<g:actionSubmit action="upload" name="upload" value="Upload" />
</g:form>

在控制器中：

def upload(){
def f = request.getFile('cv')
InputStream file = f.inputStream
byte[] bytes = file.bytes
println('bytes: '+bytes)
}

正如我在标题中所说，我在这里遇到了一个例外。有什么帮助吗？谢谢。

编辑（完整堆栈跟踪，应要求）：

Error 500: Internal Server Error

URI
/com.publidirecta.azafatas/azafataCertificada/index
Class
groovy.lang.MissingMethodException
Message
No signature of method:org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestWrapper.getFile() is applicable for argument types: (java.lang.String) values: [cv] Possible solutions: getXML(), getPart(java.lang.String), getAt(java.lang.String), getAt(java.lang.String), getLocale(), getJSON()

Around line 1158 of grails-app/controllers/com/publidirecta/AzafataCertificadaController.groovy

1155:           def upload(){
1156:       println("Acción upload. Params: "+params)
1157:       Azafata aza=Azafata.findByUsername(params.user)
1158:       def f = request.getFile('cv')
1159:       InputStream file = f.inputStream
1160:       byte[] bytes = file.bytes
1161:               }


Trace

    Line | Method
->> 1158 | upload  in AzafataCertificadaController.groovy
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|    886 | runTask in java.util.concurrent.ThreadPoolExecutor$Worker
|    908 | run . . in     ''
^    680 | run     in java.lang.Thread

Answer 1

问题在于您的请求未被视为 MultiPartRequest。做这样的事情：

MultipartRequest multipartRequest =  request as MultipartRequest
  if(multipartRequest){
    MultipartFile attachmentFile = multipartRequest.getFile("attachment_file".toString())
    if (attachmentFile) {
        -- copy it ---
    }
  }