BinaryFileDownloader.java
import java.io.BufferedInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
public class BinaryFileDownloader {
public static void main(String args[]) {
for (int i = 0; i < args.length; i++) {
try {
URL root = new URL(args[i]);
saveBinaryFile(root);
} catch (MalformedURLException e) {
System.err.println(args[i] + " is not URL I understand.");
} catch (IOException e) {
System.err.println(e);
}
}
}
public static void saveBinaryFile(URL u) throws IOException {
URLConnection uc = u.openConnection();
String contentType = uc.getContentType();
int contentLength = uc.getContentLength();
if (contentType.startsWith("text/") || contentLength == -1) {
throw new IOException("This is not a binary file.");
}
InputStream raw = uc.getInputStream();
InputStream in = new BufferedInputStream(raw);
byte[] data = new byte[contentLength];
int bytesRead = 0;
int offset = 0;
while (offset < contentLength) {
bytesRead = in.read(data, offset, data.length - offset);
if (bytesRead == -1)
break;
offset += bytesRead;
}
in.close();
if (offset != contentLength) {
throw new IOException("Only read " + offset + " bytes; Expected " + contentLength + " bytes");
}
String filename = u.getFile();
filename = filename.substring(filename.lastIndexOf('/') + 1);
FileOutputStream fout = new FileOutputStream(filename);
fout.write(data);
fout.flush();
fout.close();
}
}
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