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【实现过程】

（1）获取参数

由于我这个接口是小程序调取的，获取的参数第一个是从小程序获取的code值，第二个参数是服务传给小程序，然后小程序再传给服务的orderId。

static String wxXcxUrl = "https://api-mop.chinaums.com/v1/netpay/wx/unified-order";

（2）获取OpenId

通过code值获取到OpenId。

@Service@AllArgsConstructorpublic class WxXcxServiceImpl implements WxXcxService {    private static final Logger log = LoggerFactory.getLogger(WxXcxServiceImpl.class);    @Override    public String getOpenId(String code) throws Exception {        log.debug("通过code值获取到OpenId");        Map
   
     rtnMap = new HashMap<>();        String url = "https://api.weixin.qq.com/sns/jscode2session";        url += "?appid=" + getAppId();        url += "&secret=" + getSecret();        url += "&js_code=" + code;        url += "&grant_type=authorization_code";        CloseableHttpClient httpClient = HttpClientBuilder.create().build();        HttpGet httpGet = new HttpGet(url);        CloseableHttpResponse response = null;        RequestConfig requestConfig = RequestConfig.custom()            .setConnectTimeout(5000)            .setConnectionRequestTimeout(5000)            .setSocketTimeout(5000)            .setRedirectsEnabled(false)            .build();        httpGet.setConfig(requestConfig);        response = httpClient.execute(httpGet);        HttpEntity responseEntity = response.getEntity();        if (responseEntity != null) {            String res = EntityUtils.toString(responseEntity);            log.debug("响应内容为: {}", res);            JSONObject jo = JSON.parseObject(res);            String openid = jo.getString("openid");            log.debug("openid: {}", openid);            return openid;        }        throw new RuntimeException("获取OpenId失败");    }}
   

（3）银联的鉴权

@Service @AllArgsConstructorpublic class AppXiaDanServiceImpl implements AppXiaDanService {    private static final String appId = "";    private static final String appKey = "";    private static String authorization;    @Override    public String send(String url, String entity) throws Exception {        authorization = getOpenBodySig(appId, appKey, entity);        CloseableHttpClient httpClient = HttpClients.createDefault();        HttpPost httpPost = new HttpPost(url);        httpPost.addHeader("Authorization", authorization);        StringEntity se = new StringEntity(entity, "UTF-8");        se.setContentType("application/json");        httpPost.setEntity(se);        CloseableHttpResponse response = httpClient.execute(httpPost);        HttpEntity entity1 = response.getEntity();        String resStr = null;        if (entity1 != null) {            resStr = EntityUtils.toString(entity1, "UTF-8");        }        httpClient.close();        response.close();        return resStr;    }    private static String getOpenBodySig(String appId, String appKey, String body) throws Exception {        String timestamp = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date());        String nonce = UUID.randomUUID().toString().replace("-", "");        byte[] data = body.getBytes("UTF-8");        byte[] localSignature = hmacSHA256(data, appKey.getBytes());        String st1_C = appId + timestamp + nonce + bytesToHex(localSignature);        return "OPEN-BODY-SIG AppId=" + "\"" + appId + "\"" + ", Timestamp=" + "\"" + timestamp + "\", Nonce=" + "\"" + nonce + "\", Signature=" + "\"" + st1_C + "\"";    }    private static byte[] hmacSHA256(byte[] data, byte[] key) throws NoSuchAlgorithmException, InvalidKeyException {        Mac mac = Mac.getInstance("HmacSHA256");        mac.init(new SecretKeySpec(key, "HmacSHA256"));        return mac.doFinal(data);    }}

【测试返回】

测试结果：

转载地址：http://hphe.baihongyu.com/