解决getOutputStream() has already been called for this response
我是在TagSupport中使用了
response.getOutputStream(),导致的这个异常,参考http://gqsunrise.iteye.com/blog/1935758,解决方案如下,添加代码:pageContext.getOut().clear()
HttpServletResponse response = (HttpServletResponse)pageContext.getResponse(); response.setHeader("Content-disposition", "attachment;filename="+fileName+"."+fileExt); File file = new File(fileURI); try { FileInputStream fileInputStream = new FileInputStream(file); BufferedInputStream bufferedInputStream = new BufferedInputStream(fileInputStream); ServletOutputStream servletOutputStream = response.getOutputStream(); BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(servletOutputStream); byte[] buffer = new byte[2048]; int bytesRead; while ((bytesRead=bufferedInputStream.read(buffer,0,buffer.length))!=-1) { bufferedOutputStream.write(buffer,0,bytesRead); } bufferedOutputStream.flush(); pageContext.getOut().clear(); if (bufferedInputStream!=null) { bufferedInputStream.close(); } if (bufferedOutputStream!=null) { bufferedOutputStream.close(); } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); }