Springboo通过http请求获取文件流下载到浏览器

1.通过url，请求文件下载

public static InputStream doLoad(String address) {
        InputStream in = null;
        try {
            URL url = new URL(address);
            URLConnection urlConnection = url.openConnection();
            HttpURLConnection httpURLConnection = (HttpURLConnection) urlConnection;

            // true -- will setting parameters
            httpURLConnection.setDoOutput(true);
            // true--will allow read in from
            httpURLConnection.setDoInput(true);
            // will not use caches
            httpURLConnection.setUseCaches(false);
            // setting serialized
            httpURLConnection.setRequestProperty("Content-type", "application/x-java-serialized-object");
            // default is GET
            httpURLConnection.setRequestMethod("GET");
            httpURLConnection.setRequestProperty("connection", "Keep-Alive");
            httpURLConnection.setRequestProperty("Charsert", "UTF-8");
            // 1 min
            httpURLConnection.setConnectTimeout(60000);
            // 1 min
            httpURLConnection.setReadTimeout(60000);

            // connect to server (tcp)
            httpURLConnection.connect();

            in = httpURLConnection.getInputStream();
        } catch(Exception e){
            e.printStackTrace();
            try {
                if(in != null){
                    in.close();
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
        return in;
    }

 

 

2.后端文件下载代码

@RequestMapping(value = "loadCompanyApk")
    @ResponseBody
    public void loadCompanyApk(HttpServletResponse response, String browser) throws Exception  {
        String  FIREFOX = "Firefox";
        response.setHeader("content-type", "application/octet-stream");
        response.setContentType("application/octet-stream");
        String fileName ;
        if (FIREFOX.equals(browser)) {
            fileName = new String("云机管家企业版.apk".getBytes(), "iso-8859-1");
        }
        else {
            fileName = URLEncoder.encode("云机管家企业版.apk", "UTF-8") ;
        }
        response.setHeader("Content-Disposition", "attachment;filename=" + fileName);
        InputStream newestApkInputStream = traceVersionService.getNewestApkInputStream(SysDataConstant.APPTYPE_NODE_ENTERPRISE, ConstantClazz.SystemPlatType.Android);
        byte[] buff = new byte[1024];
        OutputStream os = null;
        try {
            os = response.getOutputStream();
            int i = newestApkInputStream.read(buff);
            while (i != -1) {
                os.write(buff, 0, buff.length);
                os.flush();
                i = newestApkInputStream.read(buff);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (newestApkInputStream != null) {
                try {
                    newestApkInputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }