Here you can find the source of buildQueryString(Map
public static String buildQueryString(Map<String, String> params) throws UnsupportedEncodingException
//package com.java2s; /*// w ww . ja va 2 s . com * Copyright 2010 Rajendra Patil * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.io.UnsupportedEncodingException; import java.net.URLEncoder; import java.util.Map; public class Main { public static String buildQueryString(Map<String, String> params) throws UnsupportedEncodingException { String qs = ""; if (params == null) return qs; int i = 0; for (String param : params.keySet()) { qs += param + "=" + URLEncoder.encode(params.get(param), "UTF-8") + (i++ < (params.size() - 1) ? "&" : ""); } return qs; } }