java httpclient post 文件到server

public void sendFileToServer (String url, File logFiles) {
        HttpURLConnection connection = null;
        OutputStream os = null;
        DataInputStream is = null;
        try {
//            StringBuilder fullUrl = new StringBuilder(url);
            connection = (HttpURLConnection) new URL(url).openConnection();
            connection.setRequestMethod("POST");
            connection.setRequestProperty("Content-Type", "application/octet-stream");
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setRequestProperty("Connection", "Keep-Alive");
            connection.addRequestProperty("uid", "1935");
            connection.addRequestProperty("strlen","11791");
            connection.addRequestProperty("bid","16");
            connection.addRequestProperty("count", "1");
            connection.addRequestProperty("num", "1");
            connection.addRequestProperty("type", "3");
//            if (customizedHeader != null)  
//                for (String key : customizedHeader.keySet()) {  
//                    connection.addRequestProperty(key, customizedHeader.get(key));  
//                }
            connection.connect();
            FileInputStream iso = new FileInputStream (logFiles);
            os = new BufferedOutputStream(connection.getOutputStream());
            
            byte[] buffer = new byte[4096];
            int bytes_read;
            while ((bytes_read = iso.read(buffer)) != -1) {
                os.write(buffer, 0, bytes_read);
            }
            os.close();
            iso.close();
            
            System.out.println("Done... ");
            
            if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) {
                System.out.println("Upload file success" + connection.getResponseCode());
                System.out.println(connection.getContent());
                System.out.println(connection.getResponseMessage());
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e1) {
            e1.printStackTrace();
        }finally {
            try {
                if(os != null) {
                    os.close();
                }
            } catch (IOException e) {
                System.out.println(e.toString());
            }
            try {
                if(is != null) {
                    is.close();
                }
            } catch (IOException e) {
                System.out.println(e.toString());
            }
            if(connection != null) {
                connection.disconnect();
            }
           }
    }