cxdm我又来了。这次我带来了微信Native退款V1.同样需要沟通的踩坑日记，请添加wx:w18013425493 大哥们轻点！！少说闲话，上菜！

先给你发垃圾微信官方支付文件地址。我用的是v1:https://pay.weixin.qq.com/wiki/doc/api/native.php?chapter=9_4

我没有使用过这个新的官方文件：

https://pay.weixin.qq.com/wiki/doc/apiv3/wxpay/pages/index.shtml

好了，开始正片

退款流程：

接口链接：https://api.mch.weixin.qq.com/secapi/pay/refund

看需要双向证书的字吗？ 这是点，他没有告诉你怎么用。 我来告诉你:

申请证书的流程：

首先:你要和你的财务部门协商，让他申请证书，也就是注册这个微信的人，也就是说app_id 和 mch_id至于申请流程，我理解你。那些人可能不明白。你必须去找它。让我告诉你这个过程

一步一步完成，这就是证书的样子

第二步 将证书放在改放的位置 当时自测放在当地 测试是放在linux服务器，映射到docker

代码实现：

点击使用证书

点击SDK与DEMO下载

把下载的解压出来你使劲往里点，这里会解压出来好多工具类，可以点进去看看，有些用不到的

这个是我导入的工具类，可以参考一下

参数拼接 调用验证证书：

/**  * 微信退款  */ @RefreshScope @Component @Slf4j public class WxRefund {      // =======【微信小程序】========     public static String WXMINI_APPID = "";     private static String WXMINI_MCHID = "";     public static String KEY = "";     /**      * 这些URl本来要写nacos在动态配置中，但当事人赶工期，就没时间写了，有空就搬过去，别骂！！！！????      */ //    @Value("${wxRefundUrl}")     private static String wxRefundUrl = "https://api.mch.weixin.qq.com/secapi/pay/refund";     private static String mac_file_path = "";     private static String linux_file_path = "";      /**      * 调用微信退款流程      * @param ""      * @param ""      * @return      * @throws WxPayException      * @throws IOException      * @throws NoSuchAlgorithmException      * @throws ParserConfigurationException      * @throws SAXException      */    public static Map<String, String> wxRefund(Long "", String "", BigDecimal "") throws Exception {        ///参数拼接        SortedMap<String, String> param = new TreeMap<String, String>();        param.put("appid", "");        param.put("mch_id", "");        //这个参数可以是雪花算法就好，这是我们公司生成的工具，你可以去cv一个        param.put("nonce_str", IdWorkerKit.get32UUID());         param.put("out_trade_no","");        param.put("out_refund_no", "");        int moneyToInt = money.multiply(new BigDecimal(100)).intValue();        ///微信支付不接受小数，按分计算 这是个小坑        param.put("total_fee", String.valueOf(moneyToInt));        param.put("refund_fee", String.valueOf(moneyToInt));        ///这个地方用上面提到的工具        String generateSignature = WXPayUtil.generateSignature(param, KEY, WXPayConstants.SignType.MD5);        param.put("sign", generateSignature);        ///以微信退款格式生成参数        String requestParam = WXPayUtil.generateSignedXml(param, KEY);        ///验证证书是否正确，并调用微信退款界面        String result = CommonUtil.postData(wxRefundUrl, requestParam,linux_file_path, WXMINI_MCHID);        return WXPayUtil.xmlToMap(result);    } }

验证证书 调用微信退款接口

import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.nio.file.Files; import java.nio.file.Paths; import java.security.*; import java.security.cert.CertificateException;  import javax.net.ssl.KeyManagerFactory; import javax.net.ssl.SSLContext;  import lombok.extern.slf4j.Slf4j; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.client.HttpClient; import org.apache.http.client.config.RequestConfig; import org.apache.http.client.methods.HttpPost; import org.apache.http.config.RegistryBuilder; import org.apache.http.conn.socket.ConnectionSocketFactory; import org.apache.http.conn.socket.PlainConnectionSocketFactory; import org.apache.http.conn.ssl.DefaultHostnameVerifier; import org.apache.http.conn.ssl.SSLConnectionSocketFactory; import org.apache.http.conn.ssl.SSLContexts; import org.apache.http.entity.StringEntity; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClientBuilder; import org.apache.http.impl.client.HttpClients; import org.apache.http.impl.conn.BasicHttpClientConnectionManager; import org.apache.http.util.EntityUtils;  import static com.wxrefund.WXPayConstants.USER_AGENT;   @Slf4j public class CommonUtil {     // 连接超时间，默认10秒     private static int socketTimeout = 10000;     // 超时传输时间默认为30秒    private static int connectTimeout = 30000;
    // 请求器的配置
    private static RequestConfig requestConfig;
    // HTTP请求器
    private static CloseableHttpClient httpClient;

    /**
     * 通过Https往API post xml数据
     *
     * @param url    API地址
     * @param xmlObj 要提交的XML数据对象
     * @return
     */
    public static String postData(String url, String xmlObj, String path, String mchId) throws IOException {
        BasicHttpClientConnectionManager basicHttpClientConnectionManager = null;
        try {
            // 加载证书 和验证证书
            basicHttpClientConnectionManager = initCertV1(path, mchId);
        } catch (Exception e) {
            e.printStackTrace();
        }
        //调用微信退款接口
        HttpClient httpClient = HttpClientBuilder.create()
                .setConnectionManager(basicHttpClientConnectionManager)
                .build();
        HttpPost httpPost = new HttpPost(url);
        RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(socketTimeout).setConnectTimeout(connectTimeout).build();
        httpPost.setConfig(requestConfig);
        StringEntity postEntity = new StringEntity(xmlObj, "UTF-8");
        httpPost.addHeader("Content-Type", "text/xml");
        httpPost.addHeader("User-Agent", USER_AGENT + " " + mchId);
        httpPost.setEntity(postEntity);
        HttpResponse httpResponse = httpClient.execute(httpPost);
        HttpEntity httpEntity = httpResponse.getEntity();
        return EntityUtils.toString(httpEntity, "UTF-8");

    }

    /**
     * 加载证书和验证证书
     * @param path
     * @param mchId
     * @return
     * @throws KeyStoreException
     * @throws CertificateException
     * @throws IOException
     * @throws NoSuchAlgorithmException
     * @throws UnrecoverableKeyException
     * @throws KeyManagementException
     */
    public static BasicHttpClientConnectionManager initCertV1(String path, String mchId) throws KeyStoreException, CertificateException, IOException, NoSuchAlgorithmException, UnrecoverableKeyException, KeyManagementException {

        char[] password = mchId.toCharArray();

        InputStream certStream = Files.newInputStream(Paths.get(path));
        KeyStore ks = KeyStore.getInstance("PKCS12");
        ks.load(certStream, password);

        // 实例化密钥库 & 初始化密钥工厂
        KeyManagerFactory kmf = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
        kmf.init(ks, password);

        // 创建 SSLContext
        SSLContext sslContext = SSLContext.getInstance("TLS");
        sslContext.init(kmf.getKeyManagers(), null, new SecureRandom());
        //这里有个大坑，这个调用是微信提供的调用demo，但是会有个问题，就是要去掉一个参数
        //这里我已经填平了，放心使用，外面会给你放图片
        SSLConnectionSocketFactory sslConnectionSocketFactory = new SSLConnectionSocketFactory(
                sslContext,
                null,
                null,
                new DefaultHostnameVerifier());


        return new BasicHttpClientConnectionManager(
                RegistryBuilder.<ConnectionSocketFactory>create()
                        .register("http", PlainConnectionSocketFactory.getSocketFactory())
                        .register("https", sslConnectionSocketFactory)
                        .build(),
                null,
                null,
                null
        );
    }
}

这个是一个大坑微信提供的文档是这个样子，一定要把他弄成null，不然他就一直会报错

No appropriate protocol (protocol is disabled or cipher suites are inappropriate)

好了大概到里基本就完事了，5000字吧，不少了，慢慢写别急，多要工期，摸摸鱼学学习，还是希望能帮到你，如果实在来不及就不用点赞了，来得及就还是点点赞哈哈哈哈哈哈！！！都兄弟客气啥，回见了您吶;