11 july

DOWNLOAD CLASS
import java.io.*;
import java.net.*;
import java.util.*;

class Download extends Observable implements Runnable {

private static final int MAX_BUFFER_SIZE = 1024;

public static final String STATUSES[] = {"Downloading",
"Paused", "Complete", "Cancelled", "Error"};

public static final int DOWNLOADING = 0;
public static final int PAUSED = 1;
public static final int COMPLETE = 2;
public static final int CANCELLED = 3;
public static final int ERROR = 4;
private URL url;
private int size;
private int downloaded;
private int status;

public Download(URL url) {
this.url = url;
size = -1;
downloaded = 0;
status = DOWNLOADING;

download();
}

public String getUrl() {
return url.toString();
}

public int getSize() {
return size;
}

public float getProgress() {
return ((float) downloaded / size) * 100;
}

public int getStatus() {
return status;
}

public void pause() {
status = PAUSED;
stateChanged();
}

public void resume() {
status = DOWNLOADING;
stateChanged();
download();
}

public void cancel() {
status = CANCELLED;
stateChanged();
}

private void error() {
status = ERROR;
stateChanged();
}

private void download() {
Thread thread = new Thread(this);
thread.start();
}

private String getFileName(URL url) {
String fileName = url.getFile();
return fileName.substring(fileName.lastIndexOf('/') + 1);
}

public void run() {
RandomAccessFile file = null;
InputStream stream = null;
try {

HttpURLConnection connection =
(HttpURLConnection) url.openConnection();

connection.setRequestProperty("Range","bytes=" + downloaded + "-");

connection.connect();

if (connection.getResponseCode() / 100 != 2) {
error();
}

int contentLength = connection.getContentLength();
if (contentLength < 1) {
error();
}

if (size == -1) {
size = contentLength;
stateChanged();
}

file = new RandomAccessFile(getFileName(url), "rw");
file.seek(downloaded);
stream = connection.getInputStream();
while (status == DOWNLOADING) {

byte buffer[];
if (size - downloaded > MAX_BUFFER_SIZE) {
buffer = new byte[MAX_BUFFER_SIZE];
} else {
buffer = new byte[size - downloaded];
}

int read = stream.read(buffer);
if (read == -1)
break;

file.write(buffer, 0, read);
downloaded += read;
stateChanged();
}

if (status == DOWNLOADING) {
status = COMPLETE;
stateChanged();
}
} catch (Exception e) {
error();
} finally {

if (file != null) {
try {
file.close();
} catch (Exception e) {}
}

if (stream != null) {
try {
stream.close();
} catch (Exception e) {}
}
}
}

private void stateChanged() {
setChanged();
notifyObservers();
}
}