在写java 的文件下载的时候一直抛出异常
getOutputStream() has already been called for this response
抛出异常getOutputStream() has already been called for this response
直到使用了下面的方法：
/ * 稿源周报excel表格下载 * @return */ @RequestMapping(value = "/downExcel", method = RequestMethod.GET, produces = "application/json;charset=UTF-8") @ResponseBody public String downExcel(HttpServletResponse response) throws UnsupportedEncodingException { LocalDate end = LocalDate.now(); LocalDate start = end.minusDays(14); String filename = "稿源抓取周报-" + end.format(DateTimeFormatter.ISO_DATE) + ".xlsx"; String filepath = "files/" + filename; writeExcelFile(start, end, filepath); // 如果文件名不为空，则进行下载 if (filename != null) { File file = new File(filepath); // 如果文件存在，则进行下载 if (file.exists()) { // 配置文件下载 response.setHeader("content-type", "application/octet-stream"); response.setContentType("application/octet-stream"); // 下载文件能正常显示中文 response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(filename, "UTF-8")); // 实现文件下载 byte[] buffer = new byte[1024]; FileInputStream fis = null; BufferedInputStream bis = null; try { fis = new FileInputStream(file); bis = new BufferedInputStream(fis); OutputStream os = response.getOutputStream(); int i = bis.read(buffer); while (i != -1) { os.write(buffer, 0, i); i = bis.read(buffer); } System.out.println("Download successfully!"); return "successfully"; } catch (Exception e) { System.out.println("Download failed!"); return "failed"; } finally { if (bis != null) { try { bis.close(); } catch (IOException e) { e.printStackTrace(); } } if (fis != null) { try { fis.close(); } catch (IOException e) { e.printStackTrace(); } } } } } return ""; } $.ajax({ url:"/down/downExcel", type:"GET", dataType:"json", success:function(result){ }}); 换成：
window.location.href="/down/downExcel";OK！
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