package com.example.demo.utils;
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import java.util.*;
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public class untils {
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/**
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* 把数组所有元素排序，并按照“参数=参数值”的模式用“&”字符拼接成字符串
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* @param params 需要排序并参与字符拼接的参数组
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* @return 拼接后字符串
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* @throws UnsupportedEncodingException
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*/
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public static String createLinkString(Map<String, String> params) {
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Map<String, String> mapparams =sortMapByKey(params);
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if (mapparams == null) {
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return "";
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}
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List<String> keys = new ArrayList<String>(mapparams.keySet());
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Collections.sort(keys);
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String prestr = "";
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for (int i = 0; i < keys.size(); i++) {
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String key = keys.get(i);
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String value = mapparams.get(key);
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if (i == keys.size() - 1) {////拼接时，不包括最后一个&字符
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prestr = prestr + key + "=" + value;
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} else {
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prestr = prestr + key + "=" + value + "&";
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}
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}
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return prestr;
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}
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/**
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* 使用 Map按key进行排序
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* @param map
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* @return
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*/
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public static Map<String, String> sortMapByKey(Map<String, String> map) {
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if (map == null || map.isEmpty()) {
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return null;
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}
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Map<String, String> sortMap = new TreeMap<String, String>(new MapKeyComparator());
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sortMap.putAll(map);
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return sortMap;
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}
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}
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