如何从GWTUpload SingleUploader将照片保存到MySQL？ [英] How to save a photograph to MySQL from GWTUpload SingleUploader?

问题描述

我正在使用Eclipse Juno和GWTUpload SingleUploader来选择和显示照片。有一些小问题，但下一个主要的工作是将输入保存到MySQL。那么如何将照片传递给MySQL呢？我打算做的是将照片存储在临时文件夹中，在写入数据库时​​从临时文件夹中取出，然后从临时文件夹中删除照片（清理）。我有以下代码（从 https://code.google.com/的步骤7复制） p / gwtupload / wiki / GwtUpload_GettingStarted ）在服务器端，但我有两个问题，我无法解决。

I am using Eclipse Juno and GWTUpload SingleUploader to select and display a photograph. There are a few minor issues however the next major thing to do is save the input to MySQL. So how do I now pass the photograph to MySQL. What I plan to do is store the photograph in a temp folder, pick it up from the temp folder when writing to the DB and then delete the photograph from the temp folder (clean up). I have the following code (copied from step 7 of https://code.google.com/p/gwtupload/wiki/GwtUpload_GettingStarted) on the server side however I have two issues in that I have been unable to resolve.

/**
   * Get the content of an uploaded file.
   */
  @Override
  public void getUploadedFile(HttpServletRequest request, HttpServletResponse response) throws IOException {
    String fieldName = request.getParameter(UConsts.PARAM_SHOW);
    File f = receivedFiles.get(fieldName);
    if (f != null) {
      response.setContentType(receivedContentTypes.get(fieldName));
      FileInputStream is = new FileInputStream(f);
      copyFromInputStreamToOutputStream(is, response.getOutputStream());
    } else {
      renderXmlResponse(request, response, XML_ERROR_ITEM_NOT_FOUND);
   }
  }

第一个问题是String fieldName = request .getParameter（UConsts.PARAM_SHOW）;我收到错误UConsts无法解析为变量我的选项是：创建常量，创建类，创建接口，创建局部变量，创建字段，创建枚举，创建参数，修复项目设置。

The first issue is at line "String fieldName = request.getParameter(UConsts.PARAM_SHOW);" where I get the error "UConsts cannot be resolved to a variable" my options are: create constant, create class, create interface, create local variable, create field, create enum, create parameter, fix project setup.

第二个问题是renderXmlResponse（request，response，XML_ERROR_ITEM_NOT_FOUND）;在那里我得到错误XML_ERROR_ITEM_NOT_FOUND无法解析为变量我的选项是：创建常量，创建局部变量，创建字段，创建参数和一些更改选项，我怀疑是答案，因为这是作者的证明代码。

The second issue is at line "renderXmlResponse(request, response, XML_ERROR_ITEM_NOT_FOUND);" where I get the error "XML_ERROR_ITEM_NOT_FOUND cannot be resolved to a variable" my options are: create constant, create local variable, create field, create parameter, and some change options which I doubt are the answer as this is proven code from the author.

非常感谢您的帮助。

问候，Glyn

推荐答案

您的项目要求将图像保存到DB吗？

Is it your project requirement to save the image to DB?

另一种方法可能是将图像文件保存到本地文件系统，并将文件的完整路径存储在数据库中。这将从重数据库中保存。

Another approach might be saving the image file to the local file system and storing the full path of the file in DB. This will save from heavy database.

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