Generate URL query string from key value parameters

Java class to generate URL query string from key value pairs. Source code below.




Source code:

/**

 * generates url from map

 * @author sergej.sizov

 */

public class UrlGenerator {

    private static String DEFAULT_ENCODING_FOR_URL = "UTF-8";

    private String address;

    private Map<String, String> map = new LinkedHashMap<String, String>();

    public UrlGenerator() {

        this.address = "";

    }

    public UrlGenerator(String address) {

        this.address = address;

    }

    public String getParameter(String param) {

        return map.get(param);

    }

    public void setParameter(String param, Object value) {

        map.put(param, value.toString());

    }

    public void unsetParameter(String param) {

        map.remove(param);

    }

    public String getUrl() {

        StringBuilder sb = new StringBuilder(address);

        List<String> listOfParams = new ArrayList<String>();

        for (String param : map.keySet()) {

            listOfParams.add(param + "=" + encodeString(map.get(param)));

        }

        if (!listOfParams.isEmpty()) {

            String query = StringUtils.join(listOfParams, "&");

            sb.append("?");

            sb.append(query);

        }

        return sb.toString();

    }

    public static String encodeString(String name) throws NullPointerException {

        String tmp = null;

        if (name == null)

            return null;

        try {

            tmp = java.net.URLEncoder.encode(name, DEFAULT_ENCODING_FOR_URL);

        } catch (Exception e) {}

        if (tmp == null)

            throw new NullPointerException();

        return tmp;

    }

}