android 网络下载获取文件大小

HttpURLConnection conn = (HttpURLConnection) url.openConnection();//建立连接

conn.setConnectTimeout(6*1000);

conn.setRequestMethod("GET");

conn.setRequestProperty("Accept-Language", "zh-CN");

conn.setRequestProperty("Referer", downloadUrl);

conn.setRequestProperty("Charset", "UTF-8");

conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.2; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)");

conn.connect();

if (conn.getResponseCode()==200) {

this.fileSize = conn.getContentLength();

if (this.fileSize <= 0) throw new RuntimeException("1无法获知文件大小 ");

fileSize就是获得的网络文件大小