生成signature

签名规则说明
1. 将参数先按键值排序（只做一级排序），进行key和value的拼接
2. 拼接完后，在最后面再拼接上分配的 appSecret 然后用sha1对拼接串加密
签名示例
假如传入参数：
$param = array(
 'access_token' => '',
 'app_key' => '152968d9af768bf084dad750f78d6866',
 'once' => '911091697599',
 'version' => '1.0',
 'sdk_from' => 'java',
 'phone' => '13800138000',
 'type' => 0,
 'client' => '{"channel":"mcontact_md_ahlrj_api_android","imei":"1","version":"v3.9.8"}',
);
1.将参数先按键值排序（只做一级排序），即变成
$param = array(
 'access_token' => '',
 'app_key' => '152968d9af768bf084dad750f78d6866',
 'client' => '{"channel":"mcontact_md_ahlrj_api_android","imei":"1","version":"v3.9.8"}',
 'once' => '911091697599',
 'phone' => '13800138000',
 'sdk_from' => 'java',
 'type' => 0,
 'version' => '1.0',
);
2.然后拼接起来：
access_token=app_key=152968d9af768bf084dad750f78d6866client={"channel":"mcontact_md_ahlrj_api_android","imei":"1","version":"v3.9.8"}once=911091697599……
3. 拼接完后，在最后面再拼接上分配的 appSecret 然后用sha1对拼接串加密
//////////////////////////////////////////////////////////////
示例代码，仅供参考：
签名生成方式
将需要提交的参数（signature除外）,按key做字典排序。 然后 key=value 形式拼接， 然后在后面 拼上 appscret。 再sha1加密
//具体php实现
function generateSignature($params_array, $appsecret) {
 if(!$appsecret){
 return '';
 }
 $str = '';
ksort($params_array, SORT_STRING);
 foreach ($params_array as $k=>$v) {
 $str .= $k."=".$v;
 }
 $str .= $appsecret;
 return sha1($str);
 }

 $signature = generateSignature($params_array, '分配的appscret'); //$params_array 就是需要提交的参数

//具体java实现
public String getNornmalSignature(HashMap<String, String> params, String appscret) {
 String signature = null;
 Map<String, String> sortedParams = new TreeMap<String, String>(params);
 Set<Entry<String, String>> entrys = sortedParams.entrySet();
 StringBuilder basestring = new StringBuilder();
 for (Entry<String, String> param : entrys) {
 basestring.append(param.getKey())
 .append("=")
 .append(param.getValue() == null ? "" : param.getValue());
 }
 basestring.append(appscret);
 try {
 signature = DigestUtils.shaHex(basestring.toString());
 } catch (Exception e) {
 e.printStackTrace();
 }
 return signature;
 }
 //java调用例子
 String once1 = new SimpleDateFormat("ssSSSS").format(new Date()) + String.valueOf(Math.random()).substring(2, 8);
 HashMap<String, String> hm1 = new HashMap<String, String>();

 hm1.put("app_key", app_key);
 hm1.put("once", once1);
 hm1.put("version", version);
 hm1.put("sdk_from", sdk_from);
 hm1.put("channel", channel);
 hm1.put("mobile", mobile);
 ……
 String signature1 = getNornmalSignature(hm1,appscret);