文件下載

@RequestMapping(value = "/downfile", method = RequestMethod.GET)
public void downfile(HttpServletRequest request, HttpServletResponse response) {
    try {
        String fileName = request.getParameter("fileName");
        String newPath = request.getSession().getServletContext().getRealPath("") + File.separator
                    + fileName;
        LoggerUtil.info(this.getClass(),"【獲取到打印模板】:"+newPath);
        File file = new File(newPath);
        if (!file.exists()) {
            response.getWriter().write("<font color='red'>系統打印異常，請聯系管理員</font>");
            return;
        }
        String fileNameShow = fileName.substring(fileName.lastIndexOf("/")+1, fileName.length());
        FileInputStream is = new FileInputStream(file);
        // 設置相應的頭部
        response.addHeader("pragma", "NO-cache");
        response.addHeader("Cache-Control", "no-cache");
        response.addDateHeader("Expries", 0);
        response.setContentType("application/x-download;charset=utf-8");
        response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileNameShow, "UTF-8"));
        IOUtils.copy(is, response.getOutputStream());
        is.close();
    } catch (Exception e) {
        LoggerUtil.error(this.getClass(), "模板打印異常" + e, e);
        try {
            response.getWriter().write("<font color='red'>系統打印異常，請聯系管理員</font>");
        } catch (IOException e1) {
            LoggerUtil.error(this.getClass(), "response寫出異常" + e1, e1);
        }
    }finally {

    }
}