public void fun(URLConnection connection) {
try {
connection.connect();
// print header fields
Map<String, List<String>> headers = connection.getHeaderFields();
for (Map.Entry<String, List<String>> entry : headers.entrySet()) {
String key = entry.getKey();
for (String value : entry.getValue()) System.out.println(key + ": " + value);
}
// print convenience functions
System.out.println("----------");
System.out.println("getContentType: " + connection.getContentType());
System.out.println("getContentLength: " + connection.getContentLength());
System.out.println("getContentEncoding: " + connection.getContentEncoding());
System.out.println("getDate: " + connection.getDate());
System.out.println("getExpiration: " + connection.getExpiration());
System.out.println("getLastModifed: " + connection.getLastModified());
System.out.println("----------");
Scanner in = new Scanner(connection.getInputStream());
// print first ten lines of contents
for (int n = 1; in.hasNextLine() && n <= 10; n++) System.out.println(in.nextLine());
if (in.hasNextLine()) System.out.println(". . .");
} catch (IOException e) {
e.printStackTrace();
}
}
public static String doPost(String urlString, Map<Object, Object> nameValuePairs)
throws IOException {
URL url = new URL(urlString);
URLConnection connection = url.openConnection();
connection.setDoOutput(true);
String encoding = connection.getContentEncoding();
if (encoding == null) encoding = "ISO-8859-1";
try (PrintWriter out = new PrintWriter(connection.getOutputStream())) {
boolean first = true;
for (Map.Entry<Object, Object> pair : nameValuePairs.entrySet()) {
if (first) first = false;
else out.print('&');
String name = pair.getKey().toString();
String value = pair.getValue().toString();
out.print(name);
out.print('=');
out.print(URLEncoder.encode(value, encoding));
}
}
StringBuilder response = new StringBuilder();
try (Scanner in = new Scanner(connection.getInputStream(), encoding)) {
while (in.hasNextLine()) {
response.append(in.nextLine());
response.append("\n");
}
} catch (IOException e) {
if (!(connection instanceof HttpURLConnection)) throw e;
InputStream err = ((HttpURLConnection) connection).getErrorStream();
if (err == null) throw e;
Scanner in = new Scanner(err);
response.append(in.nextLine());
response.append("\n");
}
return response.toString();
}