Java ¶ÏµãÐø´«

±¾ÎÄ´Óhttp://www.blogjava.net/breezedancer/archive/2007/07/19/131264.htmlתÔØ
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
//¶ÏµãÐø´«
public class Download {
public static void down(String URL, long nPos, String savePathAndFile) {
try {
URL url = new URL(URL);
HttpURLConnection httpConnection = (HttpURLConnection) url
.openConnection();
// ÉèÖÃUser-Agent
httpConnection.setRequestProperty("User-Agent", "NetFox");
// ÉèÖöϵãÐø´«µÄ¿ªÊ¼Î»ÖÃ
httpConnection.setRequestProperty("RANGE", "bytes=" + nPos);
// »ñµÃÊäÈëÁ÷
InputStream input = httpConnection.getInputStream();
RandomAccessFile oSavedFile = new RandomAccessFile(savePathAndFile,
"rw");
// ¶¨Î»ÎļþÖ¸Õëµ½nPosλÖÃ
oSavedFile.seek(nPos);
byte[] b = new byte[1024];
int nRead;
// ´ÓÊäÈëÁ÷ÖжÁÈë×Ö½ÚÁ÷£¬È»ºóдµ½ÎļþÖÐ
while ((nRead = input.read(b, 0, 1024)) > 0) {
(oSavedFile).write(b, 0, nRead);
}
httpConnection.disconnect();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public static long getRemoteFileSize(String url) {
long size = 0;
try {
HttpURLConnection conn = (HttpURLConnection) (new URL(url))
.openConnection();
size = conn.getContentLength();
conn.disconnect();
} catch (Exception e) {
e.printStackTrace();
}
return size;
}
public static void main(String[] args) {
String url = "http://www.blogjava.net/bree