package download.impl;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import download.api.Connection;
public class ConnectionImpl implements Connection {
private URL url = null;;
private HttpURLConnection conn = null;
public ConnectionImpl(String url) {
try {
this.url = new URL(url);
} catch (MalformedURLException e) {
e.printStackTrace();
}
}
@Override
public byte[] read(int startPos, int endPos) throws IOException {
try {
conn = (HttpURLConnection) url.openConnection();
} catch (IOException e) {
e.printStackTrace();
}
conn.setRequestProperty("Range", "bytes=" + startPos + "-" + endPos);
InputStream inputStream = conn.getInputStream();
byte[] result = new byte[endPos - startPos + 1];
byte[] data = new byte[1024];
int read = -1;
int i = 0;
while ((read = inputStream.read(data, 0, data.length)) != -1) {
System.arraycopy(data, 0, result, i, read);
i += read;
}
return result;
}
@Override
public int getContentLength() {
HttpURLConnection openConnection = null;
try {
openConnection = (HttpURLConnection) url.openConnection();
} catch (IOException e) {
e.printStackTrace();
}
int contentLength = openConnection.getContentLength();
openConnection.disconnect();
return contentLength;
}
@Override
public void close() {
}
}