如何在 Java 中检索重定向的 URL？

URLConnection con = new URL(url).openConnection();

// Connect to the URL
con.connect();

// Obtain the redirected URL
URL redirectedURL = con.getURL();

HttpURLConnection con = (HttpURLConnection)(new URL(url).openConnection());

// Deactivate automatic redirection following
con.setInstanceFollowRedirects(false);

// Establish the connection
con.connect();

// Retrieve the response code
int responseCode = con.getResponseCode();

// Examine the response code for redirection
if (responseCode == HttpURLConnection.HTTP_MOVED_TEMP ||
    responseCode == HttpURLConnection.HTTP_MOVED_PERM ||
    responseCode == HttpURLConnection.HTTP_SEE_OTHER) {
    
    // Fetch the "Location" header field
    String location = con.getHeaderField("Location");
    
    // Print the redirected URL
    System.out.println(location);
}