怎样计算下载速度??
URL url = new URL(urls); URLConnection conn = url.openConnection(); conn.connect(); System.out.println(urls + " 长度:" + conn.getContentLength() / 1024 + "KB"); InputStream fis = conn.getInputStream(); long a = System.currentTimeMillis(); FileOutputStream out = new FileOutputStream(path); byte buf[] = new byte[10240]; int n; while ((n = fis.read(buf)) != -1) { out.write(buf, 0, n); } fis.close(); out.close(); long b = System.currentTimeMillis(); System.out.println("[+]: 下载费时:"+ String.valueOf(b-a) + "毫秒");