How to download 100 MB
Hi, everyone here
the cod below is to download large files which mostly discussed in this forum. It download a file about 2-3 MB while it is impossible to download a 100 MB file! always collapsed after charge. 2 Mb is what someone knows another way to download big files, clues will be a great help!
public class _DownloadCombiner extends Thread {
private String remoteName;
private String localName;
private int chunksize;
public _DownloadCombiner(String remoteName, String localName, int chunksize) {
this.remoteName = remoteName;
this.localName = localName;
this.chunksize = chunksize;
}
private void method1()
{
}
public void run() {
try {
int chunkIndex = 0;
int totalSize = 0;
/*
* File connection
*/
FileConnection file = (FileConnection) Connector.open(localName);
if (!file.exists()) {
file.create();
file.setWritable(true);
OutputStream out = file.openOutputStream();
/*
* HTTP Connections
*/
String currentFile = remoteName;
HttpConnection conn;
InputStream in;
int rangeStart = 0;
int rangeEnd = 0;
while (true) {
IOUtil.print("Opening Chunk: " + chunkIndex);
// conn = (HttpConnection) Connector.open(currentFile,
// Connector.READ_WRITE, true);
// ConnectionFactory start
ConnectionFactory conn_fact = new ConnectionFactory();
conn_fact.setAttemptsLimit(3);
ConnectionDescriptor conn_desc = conn_fact.getConnection(currentFile, TransportInfo.TRANSPORT_TCP_WIFI, null);
conn = (HttpConnection) conn_desc.getConnection();
// ConnectionFactory end
rangeStart = chunkIndex * chunksize;
rangeEnd = rangeStart + chunksize - 1;
IOUtil.print("Requesting Range: " + rangeStart + "-"
+ rangeEnd);
conn.setRequestProperty("Range", "bytes=" + rangeStart
+ "-" + rangeEnd);
int responseCode = conn.getResponseCode();
if (responseCode != 200 && responseCode != 206) {
IOUtil.print("Response Code = "
+ conn.getResponseCode());
break;
}
IOUtil.print("Retreived Range: "
+ conn.getHeaderField("Content-Range"));
in = conn.openInputStream();
int length = -1;
byte[] readBlock = new byte[256];
int fileSize = 0;
while ((length = in.read(readBlock)) != -1) {
out.write(readBlock, 0, length);
fileSize += length;
Thread.yield(); // Try not to get cut off
}
totalSize += fileSize;
IOUtil.print("Chunk Downloaded: " + fileSize
+ " Bytes");
chunkIndex++; // index (range) increase
in.close();
conn.close();
in = null;
conn = null;
/*
* Pause to allow connections to close and other Threads to
* run.
*/
Thread.sleep(1000);
}
IOUtil.print("Full file downloaded: " + totalSize
+ " Bytes");
out.close();
file.close();
} else {
IOUtil.print("File already exists...");
}
} catch (InterruptedException ex) {
ex.printStackTrace();
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
The approach outlined in this KB works for me for large files.
Tags: BlackBerry Developers
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