/**

*

* 方法用途: 对所有传入参数按照字段名的 ASCII 码从小到大排序(字典序)，并且生成url参数串

* 实现步骤:

*

* @param paraMap 要排序的Map对象

* @param urlEncode 是否需要URLENCODE

* @param keyToLower 是否需要将Key转换为全小写

* true:key转化成小写，false:不转化

* @return

*/

public static String formatUrlMap(Map paraMap, boolean urlEncode, boolean keyToLower)

{

String buff = "";

Map tmpMap = paraMap;

try

{

List> infoIds = new ArrayList>(tmpMap.entrySet());

// 对所有传入参数按照字段名的 ASCII 码从小到大排序(字典序)

Collections.sort(infoIds, new Comparator>()

{

@Override

public int compare(Map.Entry o1, Map.Entry o2)

{

return (o1.getKey()).toString().compareTo(o2.getKey());

}

});

// 构造URL 键值对的格式

StringBuilder buf = new StringBuilder();

for (Map.Entry item : infoIds)

{

if (StringUtils.isNotBlank(item.getKey()))

{

String key = item.getKey();

String val = item.getValue();

if (urlEncode)

{

val = URLEncoder.encode(val, "utf-8");

}

if (keyToLower)

{

buf.append(key.toLowerCase() + "=" + val);

} else

{

buf.append(key + "=" + val);

}

buf.append("&");

}

}

buff = buf.toString();

if (buff.isEmpty() == false)

{

buff = buff.substring(0, buff.length() - 1);

}

} catch (Exception e)

{

return null;

}

return buff;

}

DEMO演示

package com.zhiweism.easemob.api;

import java.util.HashMap;

import java.util.Map;

import com.zhiweism.util.Util;

public class test {

public static void main(String[] args) {

// TODO Auto-generated method stub

//字典序列排序

Map paraMap = new HashMap();

paraMap.put("total_fee","200");

paraMap.put("appid", "wxd678efh567hg6787");

paraMap.put("body", "腾讯充值中心-QQ会员充值");

paraMap.put("out_trade_no","20150806125346");

String url = Util.formatUrlMap(paraMap, true, true);

System.out.println(url);

}

}控制台输出

appid=wxd678efh567hg6787&body=%E8%85%BE%E8%AE%AF%E5%85%85%E5%80%BC%E4%B8%AD%E5%BF%83-QQ%E4%BC%9A%E5%91%98%E5%85%85%E5%80%BC&out_trade_no=20150806125346&total_fee=200