RichFaces的fileupload和NullPointerException [英] RichFaces fileupload and NullPointerException

问题描述

我试图用rich：fileUpload上传文件到服务器，这里是代码：

  @Name（ fileUploader）
 public class FileUploader {
 
 private byte [] fileData; 
 
 public void uploadFileListener（UploadEvent uploadEvent）{
 fileData = uploadEvent.getUploadItem（）。getData（）; 
 //其他代码
 
 
 code $ $ $ $ $ $ $ $ $ 
页面包含如下：
 
 
  rich：fileUpload fileUploadListener =＃{fileUploader.uploadFileListener}
  
我得到的是uploadEvent包含文件名，大小等等的数据...但是
  uploadEvent.getUploadItem（）。getData（）; 
 
返回null ...  
 
我已经见过类似的问题这里 ...但没有答案... 
 
 
谢谢！
解决方案
您是否在组件xml中配置了multipart-filter？ 
 
 
 
类似这样： 
 
 
 < web：multipart-filter create-temp-files =truemax-request-size =1000000url-pattern =*。seam/> 
  
 更新：我不完全确定这是否用于s ：fileUpload或rich：fileUpload。在考虑这个配置之前，请检查下面的代码。默认情况下，如果我没有记错，你应该使用临时文件，这是我认为的RichFaces的默认配置。对不起，但我没有我的项目来检查它。
 
 
 
如果你像上面那样配置它，你的文件将被保存到一个临时文件（create-temp在这种情况下，您应该使用 
 
 
  uploadEvent.getUploadItem（）。getFile ）
  
您可以检查它是否存储在一个文件中：
  uploadEvent.getUploadItem（）。isTempFile（）
  
既然你说文件元数据在那里，这看起来是个问题，你只是在错误的地方寻找你的数据：）
 
 
 
 
 
 
我还记得上传控件（rich：upload）需要的东西（不完全确定）在h：form里面
 
 
希望有帮助。
 
I'm trying to upload file to the server using rich:fileUpload, here's the code:
@Name("fileUploader")
public class FileUploader {

private byte[] fileData;

    public void uploadFileListener(UploadEvent uploadEvent) {
        fileData = uploadEvent.getUploadItem().getData();
        //other code here
    }   
}
page contains the following :    
rich:fileUpload fileUploadListener="#{fileUploader.uploadFileListener}"
What I'm getting is that uploadEvent contains data about file name, size and so on... but

uploadEvent.getUploadItem().getData();

returns null...

I've already seen similar issue here... but there's no answer...

Thanks!
解决方案
Did you configured multipart-filter in components xml? 

Something like this:
<web:multipart-filter create-temp-files="true" max-request-size="1000000" url-pattern="*.seam"/>
Update: I'm not completely sure if this is used for s:fileUpload or rich:fileUpload. Please check the code bellow before thinking about this configuration. By default, if I remember correctly, you should be using temp files which is the default configuration for RichFaces I think. Sorry but I don't have my project here to check it.

If you have it configured like the above your file will be saved to a temporary file (create-temp-files="true"), in this case you should access your data by using
uploadEvent.getUploadItem().getFile()
You can check if it is stored in a file with:
uploadEvent.getUploadItem().isTempFile()
Since you say that the file "metadata" is there, this looks to be the problem, you are just looking for your data in the wrong place :)

If you have it configured to false, your method should work.

Also I remember something (not completely sure) that the upload control (rich:upload) needed to be inside an h:form 

Hope it helps.

                        
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