不能'；不要在grails中不惜任何代价上传文件

我是圣杯新手。我试了好几次上传一个文件。但失败了。我正在使用Grails2.3.11。在我的config.groovy文件中，我已经包含了

grails.web.disable.multipart=true

我没有在BuildConfig中为文件上传添加任何依赖项。我急需解决这个问题。我在下面给出代码

普惠制代码：

<g:uploadForm action="upload" enctype="multipart/form-data" useToken="true">
        <fieldset class="form">
            <input type="file" name="file" />
        </fieldset>
        <fieldset class="buttons">
            <g:submitButton name="upload" class="save" value="Upload" />
        </fieldset>
    </g:uploadForm>

我还尝试了以下代码：

MultipartRequest multipartRequest =  request as MultipartRequest
    def file = multipartRequest.getFile('file')
    if (file){
      flash.message = "File found!!"
    } else {
      flash.message = "File NOT found.  :-( "
    }
    redirect action:'list'

但每次我都会犯同样的错误：

groovy.lang.MissingMethodException: No signature of method:
    org.apache.catalina.core.ApplicationHttpRequest.getFile()
    is applicable for argument types: (java.lang.String) values: [file]
    Possible solutions: getXML(), getPart(java.lang.String), 
    getAt(java.lang.String), getAt(java.lang.String), getLocale(), getInfo()

---

如何解决这个问题？是否有文件上传的完整示例？

您应该在config.groovy中设置

grails.web.disable.multipart=false

。这意味着您希望启用对服务器的多部分请求。在控制器内部：

String content = request.getContentType()
if (content.contains("multipart/form-data") || (request instanceof MultipartHttpServletRequest)) {
    MultipartFile uploadedFile = request.getFile('file')
    if (!uploadedFile) {
        flash.message = "No attachment found for upload!"
    }else{
        flash.message = "File uploaded successfully."
    }
} else {
    flash.message = "Unable to upload file, Bad Request!")
}

---

您应该在config.groovy中设置

grails.web.disable.multipart=false。这意味着您希望启用对服务器的多部分请求。在控制器内部：

String content = request.getContentType()
if (content.contains("multipart/form-data") || (request instanceof MultipartHttpServletRequest)) {
    MultipartFile uploadedFile = request.getFile('file')
    if (!uploadedFile) {
        flash.message = "No attachment found for upload!"
    }else{
        flash.message = "File uploaded successfully."
    }
} else {
    flash.message = "Unable to upload file, Bad Request!")
}