package com.gs.xky.config;
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import com.alibaba.fastjson.JSONObject;
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import com.alibaba.fastjson.TypeReference;
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import java.security.MessageDigest;
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import java.util.*;
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public class SignUtils {
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/*
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* 自定义比较器（比较字符串）
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*/
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private static Comparator<String> keyComparator = new Comparator<String>() {
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@Override
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public int compare(String o1, String o2) {
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return o1.compareTo(o2);
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}
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};
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/*
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* 构造签名
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* @param paramJson ApiCommonParam对象转Json后的字符串
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* @param appSecret
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* @return
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*/
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public static String buildCurrentSign(String paramJson, String appSecret) {
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Map<String, String> commonMap = new HashMap<String, String>();
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Map<String, Object> jsonObject = JSONObject.parseObject(paramJson, new TypeReference<Map<String, Object>>() {
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});
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String value = "";
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List<String> keyList = new ArrayList<String>();
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for (Map.Entry<String, Object> entry : jsonObject.entrySet()) {
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value = entry.getValue().toString().trim();
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commonMap.put(entry.getKey(), value);
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if ("sign".equalsIgnoreCase(entry.getKey())) {
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continue;
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}
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keyList.add(entry.getKey());
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}
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// key排序
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Collections.sort(keyList, keyComparator);
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//拼接数据
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StringBuilder sb = new StringBuilder();
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for (String k : keyList) {
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sb.append(commonMap.get(k)).append(":");
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}
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sb.append(appSecret);
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// 计算MD5
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String signStr = null;
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try {
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signStr = getMD5(sb.toString());
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} catch (Exception e) {
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e.printStackTrace();
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return null;
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}
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return signStr.toLowerCase();
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}
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/*
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* 得到MD5值
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* @param str
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* @return
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* @throws Exception
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*/
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private static String getMD5(String str) throws Exception {
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if (str == null || str.length() == 0) {
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return null;
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}
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StringBuffer ret = new StringBuffer();
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try {
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MessageDigest digest = MessageDigest.getInstance("MD5");
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digest.update(str.getBytes("UTF-8"));
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byte[] hash = digest.digest();
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// 转为ASCII码,byte为8位,计算机为32位,采用补码形式,所以要补全.
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for (byte b : hash) {
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if ((0xFF & b) < 0x10) {
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ret.append("0" + Integer.toHexString((b & 0xFF)));
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} else {
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ret.append(Integer.toHexString(b & 0xFF));
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}
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}
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} catch (Exception e) {
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e.printStackTrace();
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throw e;
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}
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return ret.toString().toUpperCase();
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}
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}
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