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View Full Version : Internet Download Manager viết bằng Java [Đầy đủ source code]



Admin
13-01-2014, 11:33 PM
Source code Internet Download Manager này mình lấy từ site 9code.in về chia sẻ cho anh em Diễn đàn cộng đồng C Việt. Ai mong muốn có thể lấy về phát triển thêm.

Internet Download Manager screenshot
13397

Phần code xử lý chính trong chương trình:

public void run()
{
RandomAccessFile file = null;
InputStream stream = null;
try
{
// Open connection to URL.
HttpURLConnection connection =(HttpURLConnection) url.openConnection();

// Specify what portion of file to download.
connection.setRequestProperty("Range","bytes=" + downloaded + "-");

// Connect to server.
connection.connect();

// Make sure response code is in the 200 range.
if (connection.getResponseCode() / 100 != 2)
{
error();
}

// Check for valid content length.
int contentLength = connection.getContentLength();
if (contentLength < 1)
{
error();
}

/* Set the size for this download if it
hasn't been already set. */
if (size == -1)
{
size = contentLength;
stateChanged();
}

// Open file and seek to the end of it.
file = new RandomAccessFile(getFileName(url), "rw");
file.seek(downloaded);
stream = connection.getInputStream();
while (status == DOWNLOADING)
{
/* Size buffer according to how much of the
file is left to download. */
byte buffer[];
if (size - downloaded > MAX_BUFFER_SIZE)
{
buffer = new byte[MAX_BUFFER_SIZE];
}
else
{
buffer = new byte[size - downloaded];
}

// Read from server into buffer.
int read = stream.read(buffer);
if (read == -1)
{
break;
}
// Write buffer to file.
file.write(buffer, 0, read);
downloaded += read;
stateChanged();
}

/* Change status to complete if this point was
reached because downloading has finished. */
if (status == DOWNLOADING)
{
status = COMPLETE;
stateChanged();
}
}
catch (Exception e)
{
error();
}
finally
{
// Close file.
if (file != null) {
try {
file.close();
} catch (Exception e) {
}
}
// Close connection to server.
if (stream != null) {
try {
stream.close();
} catch (Exception e) {
}
}
}
}

Source code ở đính kèm