按参数名ASCII码从小到大排序（字典序）

TreeMap params = new TreeMap();
params.put("username", merchantDetails.getUsername());
params.put("password", merchantDetails.getPassword());
params.put("agent_id", merchantDetails.getAgentId());
params.put("nonce_str", SybUtil.getValidatecode(8));//随机字符串
//内容进行排序拼接
String signContent = SignatureUtil.getSignContent(params);

• SignatureUtil

  public static String getSignContent(Map<String, String> sortedParams) {
      StringBuffer content = new StringBuffer();
      List<String> keys = new ArrayList<String>(sortedParams.keySet());
      Collections.sort(keys);
      int index = 0;
      for (int i = 0; i < keys.size(); i++) {
          String key = keys.get(i);
          String value = sortedParams.get(key);
          if (null!=key&&null!=value) {
              content.append((index == 0 ? "" : "&") + key + "=" + value);
              index++;
          }
      }
      return content.toString();
  }

• SybUtil

  /**
   * 生成随机码
   * @param n
   * @return
   */
  public static String getValidatecode(int n) {
  	Random random = new Random();
  	String sRand = "";
  	n = n == 0 ? 4 : n;// default 4
  	for (int i = 0; i < n; i++) {
  		String rand = String.valueOf(random.nextInt(10));
  		sRand += rand;
  	}
  	return sRand;
  }

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