要求

    1. 首先，排除sign参数之外，将其它参数（空值除外）按名称进行字母排序，并和它的取值一起组成name=value样式的字符串，然后用&把它们拼装为一个大字符串，对于嵌套的参数，嵌套的参数列表也需按照字母排序进行拼装。
      a) 比如，要传递下列参数
      i.version=1.0.0
      ii.return_code=0
      iii.拼装之后的字符串为：return_code=0&version=1.0.0
      b) 比如，要传递下列参数
      i.a=1
      ii.b={“d”:”3”,”c”:”2”}
      iii.拼装之后的字符串为：a=1&b=c=2&d=3
      c)比如，要传递下列参数
      i.a=1
      ii.b=[{“d”:”3”,”c”:”2”},{“d”:”5”,”c”:”4”}]
      iii.拼装之后的字符串为：a=1&b=c=2&d=3&c=4&d=5
      d)比如，要传递下列参数
      i.a=1
      ii.b=[“2”,”3”]
      iii.拼装之后的字符串为：a=1&b=2&3
      e)比如，要传递下列参数
      i.a=1
      ii.b=[[{“d1”:”1”,”c1”:”2”},{“d2”:”3”,”c2”:”4”}],[{“d3”:”5”,”c3”:”6”},{“d4”:”7”,”c4”:”8”}]]
      iii.拼装之后的字符串为：a=1&b=c1=2&d1=1&c2=4&d2=3&c3=6&d3=5&c4=8&d4=7
    2. 在上述拼装之后的字符串后面直接拼装accesskey的值。
      a)比如，上述参数return_code=0&version=1.0.0，假设accesskey是123456789ABCDEF，拼装以后，成为下述字符串：
      b)return_code=0&version=1.0.0123456789ABCDEF
    3. 对上述第2步得到的字符串，进行MD5运算（32位大写），得到sign
    1. package cn.hkrt.haipay.common.utils;
    3. import net.sf.json.JSONArray;
    4. import net.sf.json.JSONObject;
    5. import org.bouncycastle.jce.provider.BouncyCastleProvider;
    7. import java.security.MessageDigest;
    8. import java.util.*;
    10. /**
    11.  * 签名工具类，按字母升序排列，拼接key
    12.  * @author zhaoyilong
    13.  *
    14.  */
    15. public class SignUtils {
    16.     private static BouncyCastleProvider provider = new BouncyCastleProvider();
    18.     /**
    19.      * 直接拼接key在最后面
    20.      * 例：key=123456789的时候待签名的字符串为，aa=3&bb=1&cc=1&dd=20160426999123456789
    21.      * @param partnerKey
    22.      * @param params
    23.      * @return
    24.      */
    25.     public  static String signParams(String partnerKey,Map params){
    26.         //直接拼接key
    27.         String tobesign = getToBeSign(params) + partnerKey;
    28.         return md5dataToSign(tobesign);
    29.     }
    32.     public static String md5dataToSign(String data){
    33.         String algorithm = "MD5";
    34.         try {
    35.             //BouncyCastleProvider provider = new BouncyCastleProvider();
    36.             MessageDigest md = MessageDigest.getInstance(algorithm, provider);
    37.             byte[] rtn = md.digest(data.getBytes("UTF-8"));
    38.             return byte2Hex(rtn).toUpperCase();
    39.         } catch (Exception e) {
    40.             e.printStackTrace();
    41.             throw new RuntimeException("不支持的算法:"+algorithm);
    42.         }
    43.     }
    45.     public static String getToBeSign(Map params){
    46.         TreeMap tm = new TreeMap();
    47.         tm.putAll(params); //参数排序
    48.         Set set = tm.entrySet();
    49.         StringBuffer sb = new StringBuffer();
    50.         int i = 0;
    51.         for (Iterator iterator = set.iterator(); iterator.hasNext();) {
    52.             Map.Entry e = (Map.Entry) iterator.next();
    53.             String k = (String)e.getKey();
    54.             //String v = (String)e.getValue();
    55.             if(e.getValue() == null || "".equals(e.getValue()) || "sign".equals(k) || "mac".equals(k)){
    56.                 continue;
    57.             }
    58.             String v = "";
    59.             if(e.getValue() instanceof JSONArray){
    60.                 v = getJsonArrayStr((JSONArray)e.getValue());
    61.             }else if(e.getValue() instanceof JSONObject){
    62.                 v = getToBeSign((JSONObject)e.getValue());
    63.             }else{
    64.                 v = e.getValue().toString();
    65.             }
    66.             if(i != 0){
    67.                 sb.append("&");
    68.             }
    69.             sb.append(k+"="+v);
    70.             i = i + 1;
    71.         }
    72.         return sb.toString();
    73.     }
    75.     public static String getJsonArrayStr(JSONArray a){
    76.         String r = "";
    77.         for(int j=0; j < a.size() ; j++){
    78.             Object b = (Object) a.get(j);
    79.             String v = "";
    80.             if(b instanceof JSONArray){
    81.                 v = getJsonArrayStr((JSONArray)b);
    82.             }else if(b instanceof JSONObject){
    83.                 v = getToBeSign((JSONObject)b);
    84.             }else{
    85.                 v = b.toString();
    86.             }
    87.             if(j ==0){
    88.                 r = v;
    89.             }else{
    90.                 r += "&" + v;
    91.             }
    92.         }
    93.         return r;
    94.     }
    96.     public static String byte2Hex(byte[] b) {
    97.         StringBuilder sb = new StringBuilder();
    98.         String stmp = "";
    99.         for (int n = 0; n < b.length; n++) {
    100.             stmp = (Integer.toHexString(b[n] & 0XFF));
    101.             if (stmp.length() == 1) {
    102.                 sb.append("0").append(stmp);
    103.             } else {
    104.                 sb.append(stmp);
    105.             }
    106.         }
    107.         return sb.toString().toUpperCase();
    108.     }
    109. }