pdf.js跨域请求问题?报错

fileName=" http://114.215.221.123/ueditor/jsp/upload/file/20170413/1492017493544030070.pdf";
    try{
     //http://114.215.221.123/ueditor/jsp/upload/file/20170413/1492017493544030070.pdf
     //纯下载方式
     response.setContentType("application/x-msdownload");
     response.setHeader("Content-Disposition","attachment;filename="+fileName.substring(fileName.lastIndexOf("/"+1),fileName.length()));
     URLurl=newURL(fileName);
     URLConnectionconn=url.openConnection();
  //    
     byte[]b=readInputStream(conn.getInputStream());
     response.getOutputStream().write(b);
     response.getOutputStream().flush();
     response.getOutputStream().close();
    }catch(Exceptione){
     e.printStackTrace();
    }

上面是我项目代码，SERVLET