package impl;
import api.Connection;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
public class ConnectionImpl implements Connection {
private HttpURLConnection urlConnection;
private InputStream inputStream;
public ConnectionImpl(HttpURLConnection urlConnection) {
this.urlConnection=urlConnection;
}
@Override
public byte[] read(int startPos, int endPos) throws IOException {//TODO 实际下载
urlConnection.setRequestProperty("Range", "bytes=" + startPos + "-" + endPos);
urlConnection.connect();
InputStream inputStream = urlConnection.getInputStream();
byte[] buffer = new byte[endPos-startPos+1];
inputStream.read(buffer);
return buffer;
}
@Override
public int getContentLength() {
try {
urlConnection.connect();
} catch (IOException e) {
e.printStackTrace();
}
return urlConnection.getContentLength();
}
@Override
public void close() {
}
}