从Android设备下载时文件为空（size = 0） [英] The file is empty(size =0) when down load from android device

问题描述

大家好，



我在设备上下载文件时遇到大问题。

我的文件是从我的网站下载的Android设备为空（文件大小= 0），而我从我的计算机下载数据（文件大小> 0）。（我使用的是Chrome浏览器，以及java上的代码）。



我不知道为什么下载的是空文件？



帮我解决这个问题



提前致谢

  public   void  download（HttpServletResponse response，InputStream attachObj）{
 OutputStream os = response.getOutputStream（）; 
 BufferedInputStream bis = null; 
 尝试 {
 response.setHeader（  Pragma，  private）; 
 response.setHeader（  Cache-Control，  private）; 
 response.setHeader（  Expires，    -  1）; 
 response.setContentType（  application / octet-stream）; 
 response.setHeader（  Content-Disposition，  attachment; +   filename * = utf-8'' + filename）; 
 response.setHeader（  Content-Length，filesize）; 
 bis =  new  BufferedInputStream（attachObj）; 
  int  c; 
  while （（c = bis.read（））！=  -   1 ）{
 os.write（c）; 
} 
} 
 最后 {
 os.flush（）; 
 os.close（）; 
 bis.close（）; 
} 
} 

解决方案

您可以使用此方法下载文件。

  public   void  downloadFile（HttpServletResponse response）抛出IOException 
 {
  byte  [] bytes = getByte（）;  //  此处为您的网站价值 
 response.setHeader（ 内容， 附件，filename =   FileName）; 
 response.setContentLength（bytes.length）; 
 response.setContentType（  image / jpeg）; 
 
  if （bytes.length> 0）
 {
 OutputStream outStream = response.getOutputStream（）; 
 outStream.write（bytes）; 
 outStream.flush（）; 
 outStream.close（）; 
} 
 
} 

更多Java解决方案，Javascript要 techwoodal [ ^ ]

Hi All,

I have a big problem when down load a file on device.
The my file was downloaded from my android device is empty(file size = 0) while I down load from my computer have data(file size > 0).(I am using Chrome browser, and code on java).

I don't know why the downloaded is empty file?

Help me resolve this

Thanks in advance

public void download(HttpServletResponse response, InputStream attachObj){
   OutputStream os = response.getOutputStream();
   BufferedInputStream bis = null;
   try{
       response.setHeader("Pragma", "private");
       response.setHeader("Cache-Control", "private");
       response.setHeader("Expires", "-1");
       response.setContentType("application/octet-stream");
       response.setHeader("Content-Disposition", "attachment;" + "filename*=utf-8''" + filename);
       response.setHeader("Content-Length", filesize);
       bis = new BufferedInputStream(attachObj);
       int c;
       while ((c = bis.read()) != -1) {
           os.write(c);
       }
   }
   finally {
       os.flush();
       os.close();
       bis.close();
   }
}

解决方案

YOU CAN USE THIS METHOD FOR DOWNLOAD FILE.

public void downloadFile(HttpServletResponse response) throws IOException
	{
	    byte[] bytes = getByte(); // HERE YOUR BITE VALUE
	    response.setHeader("Content","attachment",filename="FileName");
	    response.setContentLength(bytes.length);
	    response.setContentType("image/jpeg");

	    if(bytes.length>0)
	    {
	    	 OutputStream outStream = response.getOutputStream();
	 	    outStream.write(bytes);
	 	    outStream.flush();
	 	    outStream.close();
	    }

	}

For More Solution Of Java , Javascript To techwoodal[^]

这篇关于从Android设备下载时文件为空（size = 0）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！