http接口返回文件 服务端和客户端

 ???@RequestMapping(value = "/lsj", method = {RequestMethod.POST, RequestMethod.GET}, produces = {"text/plain;charset=UTF-8"}) ???@ResponseBody ???public String searchLsjDzzz(String jsonStr,HttpServletResponse httpServletResponse) { ???????byte[] dzzz = null; ???????//下载PDF ???????httpServletResponse.setHeader("Content-Disposition", "attachment;Filename=" + UUID.randomUUID()+".pdf"); ???????OutputStream outputStream = httpServletResponse.getOutputStream(); ???????outputStream.write(dzzz); ???????outputStream.close(); ???????return ""; ???}

 ???public byte[] requestByGetToByte(String url,String charset){ ???????if (url == null || "".equals(url)) ???????{ ???????????log.error("request url is empty."); ???????????return null; ???????} ???????HttpClient httpClient = CustomHttpClient.GetHttpClient(); ???????HttpGet get = new HttpGet(url); ???????get.setHeader("Content-Type", "text/html;charset="+charset); ???????HttpResponse resp = null; ???????try ???????{ ???????????// 发起交易 ???????????resp = httpClient.execute(get); ???????????// 响应分析 ???????????HttpEntity entity = resp.getEntity(); ???????????byte[] bytes= EntityUtils.toByteArray(entity); ???????????return bytes; ???????} catch (ConnectTimeoutException cte){ ???????????log.error(cte.getMessage(), cte); ???????????return null; ???????} catch (SocketTimeoutException cte){ ???????????log.error(cte.getMessage(), cte); ???????????return null; ???????} catch (Exception e){ ???????????log.error(e.getMessage(), e); ???????????return null; ???????}finally{ ???????????try { ???????????????if(resp!=null){ ???????????????????resp.getEntity().getContent().close(); ???????????????} ???????????} catch (IllegalStateException e) { ???????????????log.error(e.getMessage(), e); ???????????} catch (IOException e) { ???????????????log.error(e.getMessage(), e); ???????????} ???????} ???}