微信支付签名---利用TreeMap实现对参数ASCII升序排序

淩亂°似流年 2022-05-26 13:22 195阅读 0赞

ASCII码值是：48~57是十个阿拉伯数字；65~90为26个大学英文字母A-Z;97~122是26个小写英文字母a-z；

参数做ASCII码值从小到大排序（字典序）是可以巧妙的借助TreeMap实现

直接看代码：

package com.ifunpay.portal.service;
    import com.ifunpay.util.common.StringUtil;
    import org.apache.commons.lang.StringUtils;
    import java.util.HashMap;
    import java.util.Map;
    import java.util.TreeMap;
    
    /** * @Author: lilong * @Data: Created on 2018/5/3 * @Desc:微信支付接口 */ public class WXPayInterface{     /** * @Author : lilong * @Description :根据签名算法得出签名---参数按照参数名ASCII码从小到大排序（字典序） * @Date : 10:16 2018/5/3 * @Param : params 参数是一个集合的map **/ private String getSign(Map<String, String> params) {
            String Appkey = "lilong123456";
            Map<String, String> map = new TreeMap<>();
            map.putAll(params);
            //以key1 = value1&key2 = value2拼接参数 StringBuilder stringBuilder = new StringBuilder();
            for (Map.Entry<String, String> s : map.entrySet()) {
                String key = s.getKey();
                String value = s.getValue();
                if (StringUtils.isBlank(value)) {
      //过滤空值 continue;
                }
                //拼接 stringBuilder.append(key).append("=").append(value).append("&");
            }
            //拼接商户秘钥 stringBuilder.append(Appkey);
            if (!map.isEmpty()) {
                stringBuilder.deleteCharAt(stringBuilder.length() - 1);
            }
            //根据微信支付文档要求要进行 String md5 = StringUtil.getMd5HexByUtf8Encoding(stringBuilder.toString());
            return md5;
        }

/** * @Author : lilong * @Description :微信支付签约 * @Date : 10:40 2018/5/3 **/ public String wxContract() {
        //签名所需要的参数 String appid = "wxd930ea5d5a258f4f";
        String mch_id = "1200009811";
        String device_info = "1000";
        String body = "test";
        String nonce_str = "ibuaiVcKdpRxkhJA";
        Map<String, String> signMap = new HashMap<>();
        signMap.put("appid", appid);
        signMap.put("mch_id", mch_id);
        signMap.put("device_info", device_info);
        signMap.put("body", body);
        signMap.put("nonce_str", nonce_str);
        String sign = getSign(signMap);
        //签约所需要的其他参数 String plan_id = "12535";
        String contract_code = "100000";
        Integer request_serial = 1000;
        String contract_display_account = "微信代扣";
        String notify_url = "https://weixin.qq.com";
        String version = "1.0";
        String timestamp = "1414488825";
        String url = "https://api.mch.weixin.qq.com/papay/entrustweb?appid=" + appid
                + "&contract_code=" + contract_code + "&contract_display_account=" + contract_display_account + "&mch_id=" + mch_id + "&notify_url=" +
                notify_url + "&plan_id=" + plan_id + "&request_serial=" + request_serial
                + "&timestamp=" + timestamp + "&version=" + version + "&sign=" + sign;
        System.err.println("*************" + url + "***********");
        return url;
    }