web下载文件

【web下载图片】

@Override
  protected void service(HttpServletRequest req, HttpServletResponse resp)
      throws ServletException, IOException {
    getimg(req,resp);
  }
  
  /**
   * 下载图片
   * @param req
   * @param resp
   */
  protected void getimg(HttpServletRequest req, HttpServletResponse resp){
    InputStream foutput;
    try {
      foutput = new FileInputStream(new File(this.getServletContext().getRealPath("/WEB-INF/classes/小黄人.jpg")));
      byte[] bs=new byte[1024];
      int b=0;
      //通知浏览器以下载的方式打开文件
      resp.setHeader("Content-Disposition", "attachment;filename="+URLEncoder.encode("小黄人","utf-8")+".jpg");
      while ((b=foutput.read(bs)) !=-1) {
        resp.getOutputStream().write(bs, 0, b);
      }
    } catch (Exception e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
  }