grails - 尝试从目录文件系统中删除上载的文件

Question

我有一个Web应用程序，可将文件上传到文件系统并在列表中显示它们。我试图用一个按钮删除该项目。我知道我需要获取目录文件的路径才能删除它，并且我认为这是我的问题所在:

def delete = {

    def doc = Document.get(params.id)
    def path = Document.get(path.id)

    doc.delete(path)

    redirect( action:'list' )
}

我得到的错误:No such property: path for class: file_down.DocumentController Possible solutions: flash
在我看来def path = Document.get(path.id)是错误的，在这种情况下，我们如何找到文档的路径？

这是我上传文件的方法，将其分配给特定的文件大小，日期和fullPath(这是上传的文件夹)

def upload() {
    def file = request.getFile('file')
    if(file.empty) {
        flash.message = "File cannot be empty"
    } else {
        def documentInstance = new Document()
        documentInstance.filename = file.originalFilename
        documentInstance.fullPath = grailsApplication.config.uploadFolder + documentInstance.filename
        documentInstance.fileSize = file.getSize() / (1024 * 1024)
        documentInstance.company = Company.findByName(params.company)
        if (documentInstance.company == null) {
            flash.message = "Company doesn't exist"
            redirect (action: 'admin')
        }
        else {
            file.transferTo(new File(documentInstance.fullPath))
            documentInstance.save()
            redirect (action:'list', params: ['company': params.company])
        }
    }
}

Answer 1

我认为您在此行中有一个错误:

  def path = Document.get(path.id)

您尝试从您刚刚声明的path变量获取path.id。

我很确定你的意思

 def path = new File(doc.fullPath)

 path.delete() // Remove the file from the file-system

 doc.delete() // Remote the domain instance in DB

选择:

 class Document {
      // Add this to your Document domain
      def beforeDelete = {
            new File(fullPath).delete()
      }
 }

然后您可以在 Controller 中执行以下操作:

def delete = {

    def doc = Document.get(params.id)

    doc.delete() // Delete the domain instance in DB

    redirect( action:'list' )
}