response實現文件下載

    /**
     * 
     * 功能描述: <br>
     * 輸出文件
     *
     * @param response
     * @param parth 文件物理路徑
     * @param fileName 文件名
     * @param file 文件
     * @see [相關類/方法](可選)
     * @since [產品/模塊版本](可選)
     */
    protected void outputFile(HttpServletResponse response, String parth, String fileName, byte[] file) {
        if (ArrayUtils.isEmpty(file)) {
            logger.info("get file download url failed.");
            return;
        }
        // 設置相關頭信息
        response.setContentType("multipart/form-data");
        fileName = StringUtils.isNotEmpty(fileName) ? fileName : parth.substring(parth.lastIndexOf("/"));
        // 文件名編碼
        try {
            fileName = URLEncoder.encode(fileName, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            logger.error("fileName encode failed. errorMessage[{}]", e.getMessage());
        }
        response.setHeader("Content-disposition", "attachment;filename=" + fileName);
        response.addHeader("Pragma", "no-cache");
        response.addHeader("Cache-Control", "no-cache");
        response.addDateHeader("Expries", 0);
        // 返回文件
        OutputStream out = null;
        try {
            out = response.getOutputStream();
            out.write(file);
            out.flush();
        } catch (IOException e) {
            logger.error("download file failed. errorMessage[{}]", e.getMessage());
        } finally {
            if (null != out) {
                try {
                    out.close();
                } catch (IOException e) {
                    logger.error("OutputStream close failed. errorMessage[{}]", e.getMessage());
                }
            }
        }
    }