用filter下载文件

最新推荐文章于 2024-10-16 10:16:36 发布

原创最新推荐文章于 2024-10-16 10:16:36 发布 · 555 阅读

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#filter #wrapper #string #浏览器 #firefox #os

public void doFilter(ServletRequest req, ServletResponse resp,FilterChain chain) throws IOException, ServletException {

  HttpServletResponse response = (HttpServletResponse)resp;
  HttpServletRequest request=(HttpServletRequest)req;
  JResponseWrapper wrapper = new JResponseWrapper((HttpServletResponse) response);//转换为pdf包装
  chain.doFilter(request, wrapper);
  String result = wrapper.getResult();

  if (!StringUtils.isBlank(result)) {
   result = result.replaceAll("&", "&");
   response.reset();
   HttpServletResponse aa = (HttpServletResponse) response;

   String filename = (String) request.getAttribute("pdfFileName");
   if(null==filename){
    return;
   }

//文件名中文编码
   if (request.getHeader("User-Agent").toLowerCase().indexOf("firefox") > 0){
    filename = new String(filename.getBytes("UTF-8"), "ISO8859-1");//firefox浏览器
   }else{
    /*if (request.getHeader("User-Agent").toUpperCase().indexOf("MSIE") > 0)*/
    filename = URLEncoder.encode(filename, "UTF-8");//IE浏览器
   }
   aa.setContentType("application/x-download;charset=utf-8");
   aa.addHeader("Content-Disposition", "attachment;filename="+ filename+ ".pdf");
   OutputStream os = aa.getOutputStream();

ITextRenderer renderer = new ITextRenderer();
renderer.setDocumentFromString(result);

   try {
    ITextFontResolver fontResolver = renderer.getFontResolver();
    fontResolver.addFont("C:/Windows/Fonts/SIMSUN.TTC",
      BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
    //解决图片路径问题
//    renderer.getSharedContext().setBaseURL("file:/D:/myeclipseWorkspace/test/WebRoot/");

    renderer.layout();
    renderer.createPDF(os);

    os.flush();
    os.close();
   } catch (DocumentException e) {
    e.printStackTrace();
   }
  }
}

使用的包IText.jar