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 java后台通过http请求下载文件，直接反馈给前端

public void downLoad(HttpServletResponse response,String HTTP_URL, String filename) {	        BufferedInputStream bis = null;	        BufferedOutputStream bos = null;	        try {	            URL url = new URL(HTTP_URL);	            HttpURLConnection connection = (HttpURLConnection)url.openConnection();	            connection.setRequestMethod("GET");	            connection.setConnectTimeout(5000);	            connection.setReadTimeout(6000);	            connection.connect();	            int responseCode = connection.getResponseCode();	            System.out.println("responseCode=" + responseCode);	            if (responseCode == 200) {	                InputStream is = connection.getInputStream();	                bis = new BufferedInputStream(is);	                response.reset();	                response.setContentType("application/x-msdownload");	                response.setHeader("Content-Disposition", "attachment;filename=".concat(new String(filename.getBytes("GBK"), "ISO-8859-1")));	                OutputStream fos = response.getOutputStream();	                bos = new BufferedOutputStream(fos);	                boolean b = false;	                byte[] byArr = new byte[1024];	                int b1;	                while((b1 = bis.read(byArr)) != -1) {	                    bos.write(byArr, 0, b1);	                }	                bos.flush();	            }	            connection.disconnect();	        } catch (Exception var21) {	            var21.printStackTrace();	        } finally {	            try {	                if (bis != null) {	                    bis.close();	                }	                if (bos != null) {	                    bos.close();	                }	            } catch (IOException var20) {	                var20.printStackTrace();	            }	        }	    }

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