jodd-http/src/main/java/jodd/http/HttpUtil.java
public static String buildQuery(final HttpMultiMap<?> queryMap, final String encoding) {
		if (queryMap.isEmpty()) {
			return StringPool.EMPTY;
		}

		int queryMapSize = queryMap.size();

		StringBand query = new StringBand(queryMapSize * 4);

		int count = 0;
		for (Map.Entry<String, ?> entry : queryMap) {
			String key = entry.getKey();
			key = URLCoder.encodeQueryParam(key, encoding);

			Object value = entry.getValue();

			if (value == null) {
				if (count != 0) {
					query.append('&');
				}

				query.append(key);
				count++;
			} else {
				if (count != 0) {
					query.append('&');
				}

				query.append(key);
				count++;
				query.append('=');

				String valueString = URLCoder.encodeQueryParam(value.toString(), encoding);
				query.append(valueString);
			}
		}

		return query.toString();
	}
public static String buildQuery(final HttpMultiMap<?> queryMap, final String encoding) {
		if (queryMap.isEmpty()) {
			return StringPool.EMPTY;
		}

		int queryMapSize = queryMap.size();

		StringBand query = new StringBand(queryMapSize * 4);

		int count = 0;
		for (Map.Entry<String, ?> entry : queryMap) {
			String key = entry.getKey();
			key = URLCoder.encodeQueryParam(key, encoding);

			Object value = entry.getValue();

			if (value == null) {
				if (count != 0) {
					query.append('&');
				}

				query.append(key);
				count++;
			} else {
				if (count != 0) {
					query.append('&');
				}

				query.append(key);
				count++;
				query.append('=');

				String valueString = URLCoder.encodeQueryParam(value.toString(), encoding);
				query.append(valueString);
			}
		}

		return query.toString();
	}
Builds a query string from given query map.