实现http续传下载的方式

public void download() throws Exception {URL url = new URL("http://localhost/down.zip");HttpURLConnection httpConnection = (HttpURLConnection) url.openConnection();httpConnection.setRequestProperty("User-Agent", "Firefox");// range:-1000(like 1-1000)// range:1000-2000httpConnection.setRequestProperty("Range", "bytes=1024000-5689013");InputStream input = httpConnection.getInputStream();RandomAccessFile file = new RandomAccessFile("c:\\down.zip", "rw");long pos = 1024000;file.seek(pos);byte[] buff = new byte[1024];int read;while ((read = input.read(buff, 0, 1024)) > 0) {file.write(buff, 0, read);}}