如何在Java中提供本地PDF文件的下载？ [英] How to offer download of local PDF file in Java?

问题描述

我有JBoss作为应用程序服务器运行，而在我的高清上的某个地方有一个PDF文件，当用户点击一个特定的动作时，该文件被创建。假设文件在这里： C：/PDF/doonot/10.07.2012/doonot.pdf 。如何提供这个文件作为下载？我已经做了一个CSV文件，但我不知道如何用PDF。

非常感谢任何帮助。

解决方案

是否有在jsp中下载所有类型的文件的常见方法？

可以使用这样的东西：

  public HttpServletResponse getFile（HttpServletRequest request，HttpServletResponse httpServletResponse，.......）{
 HttpServletResponse response = httpServletResponse; 
 InputStream in = / *在这里您阅读您的文件作为BinaryStream * / 
 
 String filename =; 
 String agent = request.getHeader（USER-AGENT）; 
 if（agent！= null&&&  agent.indexOf（MSIE）！= -1）
 {
 filename = URLEncoder.encode（/ *这是FILENAME SHOW USER * /，UTF8）; 
 response.setContentType（application / x-download）; 
 response.setHeader（Content-Disposition，attachment; filename =+ filename）; 
} 
 else if（agent！= null&&&agent.indexOf（Mozilla）！= -1）
 {
 response.setCharacterEncoding（UTF-8 ）; 
 filename = MimeUtility.encodeText（/ *这是向用户显示的文件名* /，UTF8，B）; 
 response.setContentType（application / force-download）; 
 response.addHeader（Content-Disposition，attachment; filename = \+ filename +\）; 
} 
 
 
 BufferedOutputStream out = new BufferedOutputStream（response.getOutputStream（））; 
 byte by [] = new byte [32768]; 
 int index = in.read（by，0，32768）; 
 while（index！= -1）{
 out.write（by，0，index）; 
 index = in.read（by，0，32768）; 
} 
 out.flush（）; 
 
返回响应; 
} 
  

更新：

不要忘了你可以使用InputStream：

  //将本地文件读入InputStream 
 InputStream inputStream = new FileInputStream（c：\\\SOMEFILE.xml）; 
  

或者你可以使用它，就像这样

  //从数据库中读取
 Blob blob = rs.getBlob（1）; 
 InputStream in = blob.getBinaryStream（）; 
  

I have JBoss running as application server and somewhere on my HD there is a PDF file, that gets created when the user clicks on a specific action. Let's say the file is here: C:/PDF/doonot/10.07.2012/doonot.pdf. How can I offer this file as download? I already did it for a CSV file, but I don't know how to do it with PDF.

Any help is much appreciated.

解决方案

as i wrote on Is there a common way to download all types of files in jsp?

you can use something like this:

public HttpServletResponse getFile (HttpServletRequest request ,HttpServletResponse httpServletResponse, .......){
          HttpServletResponse response = httpServletResponse;
          InputStream in =/*HERE YOU READ YOUR FILE AS BinaryStream*/

          String filename = "";
          String agent = request.getHeader("USER-AGENT");
          if (agent != null && agent.indexOf("MSIE") != -1)
          {
            filename = URLEncoder.encode(/*THIS IS THE FILENAME SHOWN TO THE USER*/, "UTF8");
            response.setContentType("application/x-download");
            response.setHeader("Content-Disposition","attachment;filename=" + filename);
          }
          else if ( agent != null && agent.indexOf("Mozilla") != -1)
          {
            response.setCharacterEncoding("UTF-8");
            filename = MimeUtility.encodeText(/*THIS IS THE FILENAME SHOWN TO THE USER*/, "UTF8", "B");
            response.setContentType("application/force-download");
            response.addHeader("Content-Disposition", "attachment; filename=\"" + filename + "\"");
          }


          BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream());
          byte by[] = new byte[32768];
          int index = in.read(by, 0, 32768);
          while (index != -1) {
              out.write(by, 0, index);
              index = in.read(by, 0, 32768);
          }
          out.flush();

          return response;
}

UPDATE:

Dont forget that you can use the InputStream as this:

// read local file into InputStream
InputStream inputStream = new FileInputStream("c:\\SOMEFILE.xml");

or you can use it even like this

//read from database
Blob blob = rs.getBlob(1);
InputStream in = blob.getBinaryStream();

这篇关于如何在Java中提供本地PDF文件的下载？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！