IO流下载文件，支持中文

来源：互联网发布：javascript用户名验证编辑：程序博客网时间：2024/05/17 08:40

private String fileName;

   public String getFileName() throws UnsupportedEncodingException {
       return fileName;
   }

   public void setFileName(String fileName) throws UnsupportedEncodingException {
       this.fileName = fileName;
   }

//下载Excel文件

public void downloadexcel() {

       try {

           HttpServletRequest request = ServletActionContext.getRequest();
           HttpServletResponse response = ServletActionContext.getResponse();

           String realPath = ServletActionContext.getServletContext().getRealPath("/upload") + "\\" + fileName;
           System.out.println(realPath);
           File file = new File(realPath);// 得到一个file对象

           if (file.exists()) {

               // 以流方式输出
               response.setCharacterEncoding("UTF-8");
               response.setContentType("application/octet-stream");

               setFileDownloadHeader(request, response, fileName);

               InputStream in = new FileInputStream(new File(realPath));
               OutputStream fileOut = response.getOutputStream();
               int b;
               while ((b = in.read()) != -1) {
                   fileOut.write(b);
               }
               in.close();
               fileOut.close();
           }
       } catch (Exception e) {
           e.printStackTrace();
       }
   }

   public void setFileDownloadHeader(HttpServletRequest request, HttpServletResponse response, String fileName) {
       String userAgent = request.getHeader("USER-AGENT");
       try {
           String finalFileName = null;
           if (userAgent.contains("MSIE")) {// IE浏览器
               finalFileName = URLEncoder.encode(fileName, "UTF8");
           } else if (userAgent.contains("Mozilla")) {// google,火狐浏览器
               finalFileName = new String(fileName.getBytes(), "ISO8859-1");
           } else {
               finalFileName = URLEncoder.encode(fileName, "UTF8");// 其他浏览器
           }
           response.setHeader("Content-Disposition", "attachment; filename=\"" + finalFileName + "\"");// 这里设置一下让浏览器弹出下载提示框，而不是直接在浏览器中打开
       } catch (UnsupportedEncodingException e) {
           e.printStackTrace();
       }
   }

1 0