Java中 URL實現斷點下載

複製代碼 代碼如下:URL ur = new URL("http://localhost:8080/first/he.txt");
HttpURLConnection conn = (HttpURLConnection) ur.openConnection();//URL.openConnection() -- >return URLCommection(直接子類HttpURLConnection)
conn.setRequestProperty("Range", "bytes=5-");//佈建要求參數屬性，設定下載從第5個位元組開始下載；
InputStream in = conn.getInputStream();
int len = 0;
byte[] buf = new byte[1024];
FileOutputStream out = new FileOutputStream("d:\\a.txt");
while ((len = in.read(buf)) > 0) {
out.write(buf, 0, len);
}
in.close();
out.close();