在Apache Tapestry页面访问上传的文件 [英] Accessing uploaded file in Apache Tapestry page

问题描述

我使用的是Apache Tapestry v5.3.7，我已经在表单中使用了正常的Tapestry上传组件。为了更好的用户体验，我现在尝试在没有任何形式的情况下将Dropzone.js集成到普通的Tapestry页面中。 JavaScript集成工作正常。上传的文件数据传输到我的服务器与一个post请求，我可以访问请求的所有参数。

我现在的问题是如何访问二进制文件上传文件的数据（可能是InputStream）将它们保存在我的系统中？我已经注入了http请求，但getInputStream返回一个空的流。

感谢您的任何建议

  / ** java页面的代码片段* / 
 ... 
 
 @Inject 
 protected HttpServletRequest _request; 
 
 public void onActivate（String rowId）{
 String fileName = _request.getParameter（file）; 
 try {
 InputStream is = _request.getInputStream（）; 
 //如果我读取它是否返回-1 
 // :-( 
 doSomeSaveStuff（is）; //虚拟代码
} 
 catch（Exception e）{
 e.printStackTrace（）; 
} 
} 
 
 ... 
  
解决方案

在他的Tapestry魔术博客上，他整合了一个不同的文件上传器库和Tapestry，我猜你的答案将会在那里。

I'm using Apache Tapestry v5.3.7 and I already use the normal Tapestry upload component in a form. For a better user experience I try now to integrate Dropzone.js in a normal Tapestry page without any form. The JavaScript integration works fine. The uploaded file data are transferred to my server with a post request and I can access the request with all of its parameters.

My question is now how can I access the binary data of the uploaded file (maybe as InputStream) to save them in my system? I already injected the http request but getInputStream returns a empty stream.

Thanks for any suggestions

/** Code snippet of page java part */
...

@Inject
protected HttpServletRequest _request;

public void onActivate (String rowId) {
    String fileName=_request.getParameter("file");
    try {
        InputStream is=_request.getInputStream();
        // if I do read from is it returns -1
        // :-(
        doSomeSaveStuff(is); // dummy code
    }
    catch(Exception e) {
        e.printStackTrace();
    }
}

...

解决方案

Taha has a blog post here on his Tapestry Magic blog he integrates a different file uploader library with Tapestry. I'm guessing your answer will be there.

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