Java文件流下载「终于解决」

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用java流的形式输出到页面，实现文件下载

    @RequestMapping(value = "/page/file/download")
    @ResponseBody
    public void download(HttpServletRequest request, HttpServletResponse response,String fileName) throws Exception { 
   
    	File file = CSVUtils.createCSVFile("temp"+System.currentTimeMillis()+".csv");
    	try { 
   
        	OutputStream out = response.getOutputStream();
        	byte[] buffer = filewsUtil.download(fileName);
            if (null != buffer && buffer.length > 0) { 
   
				// 清空response
				response.reset();
				// 设置response的Header
				response.addHeader("Content-Disposition","attachment;filename="+ file.getName());
				response.addHeader("Content-Length", "" + buffer.length);
				response.setContentType("application/octet-stream");
				out.write(buffer);
				out.flush();
				out.close();
			}
        } catch (Exception e) { 
   
            e.printStackTrace();
        } finally { 
   
        	file.delete();
        }
    }