如何迭代在Grails中上传的文件

问题描述

我有这个GSP：

 < g：uploadForm name =myFormaction ='save'> 
< input type ='file'name ='documentFile'value =''/> 
< input type ='file'name ='documentFile'value =''/> 
< input type ='file'name ='documentFile'value =''/> 
< input type ='file'name ='documentFile'value =''/> 
< input type ='submit'value ='提交'/> 
< / g：uploadForm> 
  

但是当我试图通过输入来查看控制器中的结果时：

  render（params）; 
返回true; 
  

我得到了这个结果：

<$ p $ documentFile：org.springframework.web.multipart.commons.CommonsMultipartFile@14dcf95


如何读取每个正在上传的文件？
可以得到以下内容吗？

$ p $ documentFile：[File，null，File，null] //第二和第四不被使用）


ps：我正在使用grails 1.2.2
$ b

解决方案 $ b

 < g：uploadForm name =myFormaction =save> 
< input type =filename =documentFile1value =/> 
< input type =filename =documentFile2value =/> 
 ... 
< / g：uploadForm> 
  

然后在您的控制器中，您可以使用：

  //通过名称访问每个文件
 File file = request.getFile（'documentFile1'）
 
 //遍历它们
 request.fileNames.each {
 File file = request.getFile（it）
} 
  

我很确定您的名称属性必须是唯一的。我在API中找不到任何东西，它们将允许您获取使用相同输入名称上传的文件数组。

参考文献：

I have this GSP:

<g:uploadForm name="myForm" action='save'>
    <input type='file' name='documentFile' value=''/>
    <input type='file' name='documentFile' value=''/>
    <input type='file' name='documentFile' value=''/>
    <input type='file' name='documentFile' value=''/>
    <input type='submit' value='Submit'/>
</g:uploadForm>

But when I tried to view the result in controller by typing:

render(params);
return true;

I got this result:

"documentFile":org.springframework.web.multipart.commons.CommonsMultipartFile@14dcf95

How do I read each file that is being uploaded?Could I get the following?

documentFile:[File,null,File,null] // (if the 2nd and the 4th are not being used)

ps: I'm using grails 1.2.2

解决方案

First, you'll need to give unique names to each of your file inputs:

<g:uploadForm name="myForm" action="save">
    <input type="file" name="documentFile1" value=""/>
    <input type="file" name="documentFile2" value=""/>
    ...
</g:uploadForm>

Then in your controller, you can use:

// access each file by name
File file = request.getFile('documentFile1')

// or iterate through them
request.fileNames.each {
    File file = request.getFile(it)
}

I'm pretty sure that your name attributes have to be unique. I can't find anything in the API that will allow you to get an array of files that were uploaded with the same input name.

References:

• http://www.grails.org/File+Upload
• http://www.grails.org/doc/latest/guide/6.%20The%20Web%20Layer.html#6.1.9%20Uploading%20Files

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