下载网络文件HttpURLConnection.getContentLength()大小为 0

HttpURLConnection conn = (HttpURLConnection)url.openConnection();

conn.setRequestProperty("Accept-Encoding", "identity");    // 加上这句话解决问题

conn.connect();

int length = conn.getContentLength();

InputStream is = conn.getInputStream();

来自为知笔记(Wiz)