Here you can find the source of convertToDataString(Map
private static String convertToDataString(Map<String, String> data) throws UnsupportedEncodingException
//package com.java2s; /*//from w w w . j av a 2 s.co m * Copyright (c) 2015 iLexiconn * * Permission is hereby granted, free of charge, to any person * obtaining a copy of this software and associated documentation * files (the "Software"), to deal in the Software without * restriction, including without limitation the rights to use, * copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following * conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. */ import java.io.*; import java.net.*; import java.util.Map; public class Main { private static String convertToDataString(Map<String, String> data) throws UnsupportedEncodingException { StringBuilder builder = new StringBuilder(); for (Map.Entry entry : data.entrySet()) { builder.append(URLEncoder.encode(entry.getKey().toString(), "UTF-8")).append("=") .append(URLEncoder.encode(entry.getValue().toString(), "UTF-8")).append("&"); } String result = builder.toString(); return result.length() > 0 ? result.substring(0, result.length() - 1) : ""; } }