我在 Internet 上浏览随机 Java 代码，并找到了下载管理器的源代码。它用于RandomAccessFile下载文件。我无法弄清楚的一件事是它会下载到哪里。这是下载文件的方法：
public void startDownload() {
System.out.println("Starting...");
RandomAccessFile file = null;
InputStream stream = null;
try {
URL downloadLink = new URL("http://www.website.com/file.txt");
// Open the connection to the URL
HttpURLConnection connection = (HttpURLConnection) downloadLink.openConnection();
// Specify what portion of file to download
connection.setRequestProperty("Range", "bytes=" + downloaded + "-");
// Connect to the server
connection.connect();
// Make sure the 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 the 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(downloadLink), "rw");
// getFileName returns the name of the file mentioned in the URL
file.seek(downloaded);
stream = connection.getInputStream();
while (status == DOWNLOADING) {
System.out.println("Progress: " + getProgress() + "%");
// Size the 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 the server into the buffer
int read = stream.read(buffer);
if (read == -1) {
break;
}
// Write buffer to file
file.write(buffer, 0, read);
downloaded += read;
stateChanged();
}
if (status == DOWNLOADING) {
status = COMPLETE;
stateChanged();
}
} catch (Exception e) {
error();
} finally {
// Close the stream and RAF
}
System.out.println("Done!");
}
如果这很明显，我很抱歉。我是RandomAccessFile班上的新手，因为我今天才知道。