通過servlet將pdf流式傳輸到瀏覽器

我有一個典型的servlet將pdf流式傳輸到瀏覽器。這些pdf存儲在我的servlet從中獲取的內部服務器上。如果我直接從瀏覽器中打開servlet，則會顯示pdf。如果我在網頁中的<IMG>標記中嘗試使用相同的網址，那麼...破損的管道。通過servlet將pdf流式傳輸到瀏覽器

任何洞察力爲什麼這應該是？

作爲一個實驗，我可以流沒有問題的GIF。

這裏，我幾乎從innerwebs清除代碼：

public class PdfServlet extends HttpServlet { 

    private static final Logger log = Logger.getLogger(PdfServlet.class.getName()); 

    @Override 
    public void doGet(HttpServletRequest req, HttpServletResponse res) { 

     String url = (String) req.getParameter("url"); 

     log.info("The URL is " + url); 
     String format = "application/pdf"; 
//   String format = "image/gif"; 

     streamBinaryData(url, format, res); 

    } 

    /* 
    * This Method Handles streaming Binary data 
    * <p> 
    * @param String urlstr ex: http;//localhost/test.pdf etc. 
    * @param String format ex: pdf or audio_wav or msdocuments etc. 
    * @param ServletOutputStream outstr 
    * @param HttpServletResponse resp 
    */ 
    private void streamBinaryData(
      String urlstr, 
      String format, 
      HttpServletResponse resp) { 

     ServletOutputStream outstr = null; 
     String ErrorStr = null; 

     try { 
      outstr = resp.getOutputStream(); 

      //find the right MIME type and set it as contenttype 
      resp.setContentType(format); 
      BufferedInputStream bis = null; 
      BufferedOutputStream bos = null; 
      try { 
       URL url = new URL(urlstr); 
       URLConnection urlc = url.openConnection(); 
       int length = urlc.getContentLength(); 

       resp.setContentLength(length); 
//    resp.setHeader("Content-Length", String.valueOf(+length)); 
//    resp.setHeader("Content-Disposition", "inline"); 

       // Use Buffered Stream for reading/writing. 
       InputStream in = urlc.getInputStream(); 
       bis = new BufferedInputStream(in); 
       bos = new BufferedOutputStream(outstr); 
       byte[] buff = new byte[length]; 
       int bytesRead; 
       // Simple read/write loop. 
       while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) { 
        log.info("Got a chunk of " + bytesRead); 
        bos.write(buff, 0, bytesRead); 
       } 
      } catch (Exception e) { 
       e.printStackTrace(); 
       ErrorStr = "Error Streaming the Data"; 
       outstr.print(ErrorStr); 
      } finally { 
       log.info("finally!!!"); 
       if (bis != null) { 
        bis.close(); 
       } 
       if (bos != null) { 
        bos.close(); 
       } 
       if (outstr != null) { 
        outstr.flush(); 
        outstr.close(); 
       } 
      } 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 
}

...和HTML文件。即使內容類型被返回爲'application/pdf'，pdf也會失敗並顯示一個損壞的管道並顯示gif圖像。

<html> 
    <head> 
     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 
     <title>Cheesy Servlet Experiment</title> 
    </head> 
    <body> 
     <h1>Cheesy Servlet Experiment</h1> 

     <P> 
      <img src="http://10.0.0.9/ServletExperiment/pdf?url=http%3a%2f%2fwww.samplepdf.com%2fsample.pdf" alt="yah mon"> 
     <P> 
      <img src="http://10.0.0.9/ServletExperiment/pdf?url=http%3a%2f%2fbbs.homeshopmachinist.net%2fimages%2fstatusicon%2fforum_new.gif" alt="yah mon"> 
    </body> 
</html>

編輯 - 下面的作品在FF中。我不知道它有多標準。

<object data="http://www.samplepdf.com/sample.pdf" type="application/pdf" width="600" height="600"> 
    alt : <a href="http://www.samplepdf.com/sample.pdf">test.pdf</a> 
</object>

Interesting info here。看起來相當好的支持。

來源

2010-10-06 Tony Ennis

編輯與可能的解決方案在發佈。 – 2010-10-06 06:32:11

什麼是功能要求？在線顯示PDF？「