[Java] ParameterUtils

package xxx.xxx.common.web;
 
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import javax.servlet.http.HttpServletRequest;
import net.bogo.common.util.StringUtil;
 
public class ParameterUtils {
    public static boolean isEmpty(HttpServletRequest request, String param) {
        return ((request.getParameter(param) == null) || (request.getParameter(param).equals("")));
    }
 
    public static String getStringParameter(HttpServletRequest request, String param, String def) {
        if (isEmpty(request, param)) {
            return def;
        }
        return request.getParameter(param);
    }
 
    public static int getIntegerParameter(HttpServletRequest request, String param, int def) {
        if (isEmpty(request, param)) {
            return def;
        }
        String str = request.getParameter(param);
        return StringUtil.toInteger(str, def);
    }
 
    public static String setParameterValue(HttpServletRequest request, String paramName, String paramValue)
            throws UnsupportedEncodingException {
        String queryString = request.getQueryString();
        StringBuilder newQueryString = new StringBuilder();
        String[] parameter = queryString.split("\\&");
 
        for (String s : parameter) {
            String[] p = s.split("\\=");
            if (p.length != 2)
                continue;
            if (p[0].equals(paramName)) {
                p[1] = paramValue;
            }
            p[1] = URLEncoder.encode(p[1], "UTF-8");
            newQueryString.append(p[0] + "=" + p[1] + "&");
        }
 
        return newQueryString.toString();
    }
    public static Map<String, Object> getRequestParameterMap(HttpServletRequest req) {
        Map<String, Object> reqParamMaps = new HashMap<String, Object>();
        Map<String, Object> reqMap = new HashMap<String, Object>();
 
        reqParamMaps.putAll(req.getParameterMap());
        Set<?> keySet = reqParamMaps.keySet();
 
        for (Object key : keySet) {
            Object obj = reqParamMaps.get(key);
            if (obj.getClass().isArray() || Array.getLength(obj) == 1) {
                reqMap.put(key.toString(), Array.get(obj, 0));
            } else {
                reqMap.put(key.toString(), obj);
            }
        }
    return reqMap;
    }
}
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