Spring MVC 在线预览

/**
     * 合同URL转换-空白合同（服务器加了白名单）
     * @return
     * @throws IOException
     */
    @RequestMapping(value = "/yunji/agreement/get_template", method = RequestMethod.GET)
    public void get_template(String s, HttpServletResponse response) {
        String path = formsOpenapiConfig.getZd_post_url()+"api/v1/yunji/agreement/get_template?s="+s;
        try {
            byte[] html = yunJiService.createHtml(path);
            response.setContentType("text/html;charset=UTF-8");
            response.setCharacterEncoding("utf-8");
            response.getWriter().write(new String(html));
        } catch (IOException e) {
            e.printStackTrace();
        }
        response.setStatus(HttpServletResponse.SC_OK);
    }

    /**
     * 合同URL转换-PDF（服务器加了白名单）
     * @return
     * @throws IOException
     */
    @RequestMapping(value = "/link", method = RequestMethod.GET)
    public void link(String s, HttpServletResponse response) {
        String path = formsOpenapiConfig.getZd_post_url()+"api/v1/link?s="+s;
        try {
            byte[] html = yunJiService.createHtml(path);
            response.setContentType("application/pdf;charset=UTF-8");
            response.setCharacterEncoding("utf-8");
            response.getOutputStream().write(html);
        } catch (IOException e) {
            e.printStackTrace();
        }
        response.setStatus(HttpServletResponse.SC_OK);
    }

public byte[] createHtml(String path) throws IOException {
       URL url = new URL(path);
       HttpURLConnection conn = (HttpURLConnection) url.openConnection();
       // 设置超时间为3秒
       conn.setConnectTimeout(3000);
       // 防止屏蔽程序抓取而返回403错误
       conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");

       // 得到输入流
       InputStream is = conn.getInputStream();
       byte[] body = readInputStream(is);

       // 关闭流
       is.close();

       return body;
   }

   /**
 * 从输入流中获取字节数组
 * @param inputStream
 * @return
 * @throws IOException
 */
private byte[] readInputStream(InputStream inputStream) throws IOException {
   byte[] buffer = new byte[1024];
   int len = 0;
   ByteArrayOutputStream bos = new ByteArrayOutputStream();
   while ((len = inputStream.read(buffer)) != -1) {
      bos.write(buffer, 0, len);
   }
   bos.close();
   return bos.toByteArray();
}