/**
* 从网络加载分段信息
*
* @param file
* @param url
*/
private void createBlockFromNetFile(DownloadFile file, URL url) throws CreateBlockException {
if (url == null) {
throw new CreateBlockException();
// return;
}
try {
// 分段
final int threadCount = Constants.thread_count;
blocks.clear();
//
HttpURLConnection c = (HttpURLConnection) url.openConnection();
Utils.configCommonHeader(c, file.getSourceUrl());
c.connect();
//
if (c.getResponseCode() == 200) {
file.setFileSize(c.getContentLength());
} else {
throw new CreateBlockException();
// return;
}
long perBlockSize = file.getFileSize() / threadCount;
String filename = getFileName(c, file.getSourceUrl());
file.setFileName(filename);
recorder.updateFile(context, file);
//
File outFile = file.getFile();
if (outFile != null && !outFile.exists()) {
outFile.createNewFile();
}
// RandomAccessFile randOut = new RandomAccessFile(outFile,
// "rw");
// randOut.setLength(file.getFileSize());
//
int lastThread = threadCount - 1;
final String sourceUrl = file.getSourceUrl();
for (int i = 0; i < threadCount; i++) {
long start = i * perBlockSize;
long end;
if (i == lastThread) {
end = file.getFileSize();
} else {
end = (i + 1) * perBlockSize;
}
DownloadBlock b = new DownloadBlock(file, sourceUrl, start, end, 0);
blocks.add(b);
}
// 保存分段记录到数据库
if (!blocks.isEmpty()) {
recorder.addBlocks(context, blocks, file.getSourceUrl());
}
} catch (IOException e) {
e.printStackTrace();
blocks.clear();
throw new CreateBlockException();
}
}
