签名和demo说明

//md5('aaa')为：47bce5c74f589f4867dbd57e9ca9f808
//md5('中')为：aed1dfbc31703955e64806b799b67645
如果加密对不上，请使用其他方法

//下面为PHP支付接口代码（参数以接口参数为准，加密方式一样）$url = 'https://api.leadnew.com.cn/pay/index';
$data = array(
    'merchantid'=>'平台分配merchantid',    'action'=>'do.pay',
    'pay_code'=>'wxjsapi',
    'serial_number'=>'574618357010137088',
    'amount'=>'0.01',
    'subject'=>'话费test',
    'mobile'=>'18368493887',
    'remark1'=>'',
    'remark2'=>'',
    'notify_url'=>'http://www.baidu.com',
    'server_notify_url'=>'http://xxx/cashier/aboclx/callback',
    'gateway'=>'partners.mini',
    'sub_appid'=>'xxxx',
    'sub_openid'=> 'xxx',
);ksort($data);//按照键名顺序排序
$str = '';
foreach($data as $k=>$v){
    if(is_array($v)){
        $data[$k] = json_encode($v,JSON_UNESCAPED_UNICODE);
        $v = json_encode($v,JSON_UNESCAPED_UNICODE);
    }
    $str .= $k.'='.$v.'&';
}
$str = $str.'key=平台分配pubkey';
str字符串组合后(参考各接口说明)：action=do.pay&amount=0.01&merchantid=XXX&mobile=notify_url=XXX&pay_code=abc&remark1=&remark2=&serial_number=1565583202&server_notify_url=XXX&subject=XXX&key=XXX$data['sign'] = md5($str);

//支付接口
$sHtml = "<form id='paysubmit' name='paysubmit' action='".$url."' method='POST'>";
foreach($data as $k=>$v){
    $sHtml.= "<input type='hidden' name='".$k."' value='".$v."'/>";
}
$sHtml = $sHtml.'<input type="hidden" type="submit" value="Submit" />';
$sHtml = $sHtml."</form>";
$sHtml = $sHtml."<script>document.forms['paysubmit'].submit();</script>";
print_r($sHtml);

//其他接口
//初始化
$curl = curl_init();
//设置抓取的url
curl_setopt($curl, CURLOPT_URL, $url);
//设置头文件的信息作为数据流输出
curl_setopt($curl, CURLOPT_HEADER, 0);
//设置获取的信息以文件流的形式返回，而不是直接输出。
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
//设置post方式提交
curl_setopt($curl, CURLOPT_POST, 1);
//设置post数据
curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE); // https请求 不验证证书和hosts
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);
//执行命令
$result = curl_exec($curl);
//关闭URL请求
curl_close($curl);
//显示获得的数据
//$result = json_decode($result,true);
print_r($result);




//下面为java支付代码（参数以接口参数为准，加密方式一样）
public class test {

	public static String doPost(String url, HashMap map) {
		String response = null;
		HttpClient client = new HttpClient();
		//HttpMethod method = new GetMethod(url);
		PostMethod method = new PostMethod(url);
		method.setRequestHeader("Content-Type","application/x-www-form-urlencoded;charset=utf-8"); 
		for(Object obj : map.keySet()) {     
			Object key = obj;     
			Object value = map.get(obj);   
			method.addParameter(key.toString(), value.toString());
		}

		try {
			client.executeMethod(method);
			if (method.getStatusCode() == HttpStatus.SC_OK) {
				response = method.getResponseBodyAsString();
			}
		} catch (URIException e) {
			System.out.println("执行HTTP Get请求时，编码查询字符串发生异常！");
		} catch (IOException e) {
			System.out.println("执行HTTP Get请求" + url + "时，发生异常！");
		} finally {
			method.releaseConnection();
		}
		return response;
	}	
	
	public static void main(String[] args) {
		try {
			HashMap<String, String> map = new HashMap<>();
			map.put("merchantid","平台分配merchantid");
			map.put("action","do.pay");
			map.put("pay_code","abc");
			//排序
			Map<String, String> resMap = sortMapByKey(map);
			//加密
			String param = "";
			for (Map.Entry<String, String> entry : resMap.entrySet()) {
				param = param + entry.getKey() + "=" + entry.getValue() + "&";
			}
			param = param + "key=平台分配pubkey";
			String sign = getMD5(param);
			map.put("sign",sign);


			1.支付功能请输出form表单
                        //doPost后台请求用于主扫或被扫等其他服务器请求
                        String response = doPost("https://api.leadnew.com.cn/pay/index",map);
			System.out.println(response);
                        
                        
            2.form表单输出
            String param = "<form id='paysubmit' name='paysubmit' action='".$url."' method='POST'>";
            for (Map.Entry<String, String> entry : resMap.entrySet()) {
                 param =  param + "<input type='hidden' name='"+entry.getKey() +"' value='"+entry.getValue()+"'/>";                        }
                        param  = param +'<input type="hidden" type="submit" value="Submit" />';
                        param  = param+"</form>";
                        param = param+"<script>document.forms['paysubmit'].submit();</script>";
                        System.out.println(param );


		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	 
	public static Map<String, String> sortMapByKey(Map<String, String> map) {
		if (map == null || map.isEmpty()) {
			return null;
		}
		Map<String, String> sortMap = new TreeMap<String, String>(new MapKeyComparator());
		sortMap.putAll(map);
		return sortMap;
	}

	public static String timeStamp(){
		long time = System.currentTimeMillis();
		String t = String.valueOf(time/1000);
		return t;
	}
	
	public static String getMD5(String str) throws Exception {
            MessageDigest md5 = MessageDigest.getInstance("MD5"); 
            md5.update(str.getBytes());
            byte[] md5Bytes = md5.digest();
            String res = "";
            for (int i = 0; i < md5Bytes.length; i++){
                int temp = md5Bytes[i] & 0xFF;
                if (temp <= 0XF){
                    res += "0";
                }
                res += Integer.toHexString(temp);
            }
            return res;
        }	
}
//实现一个比较器类

class MapKeyComparator implements Comparator<String> {
 
	@Override
	public int compare(String s1, String s2) {
		return s1.compareTo(s2);  //从小到大排序
	}
}