微信退款

1.请登录微信支付商户平台，点击【账户中心】->【账户设置】->【API安全】->【下载证书】中。

安装这个到本地任意路径，安装的时候需要输入密码（密码默认是mch_id）；

2.注意参数设置（微信支付与退款的的支付金额退款金额都是以分为单位的）*

3.核心代码

        设置参数

 

        发送请求

   //微信退款
public static String wePayRefund(String url,String xmlInfo) throws Exception {
    KeyStore keyStore  = null;
    try {
        keyStore = KeyStore.getInstance("PKCS12");
    } catch (KeyStoreException e) {
        e.printStackTrace();
    }
    FileInputStream instream = new FileInputStream(new File("C:\\Users\\admin\\Desktop\\apiclient_cert.p12"));//P12文件目录
    try {
        keyStore.load(instream, Constants.JTS_WCHART_MCH_ID.toCharArray());//这里写密码..默认是你的MCHID
    } finally {
        instream.close();
    }
    SSLContext sslcontext = null;
    try {
        sslcontext = SSLContexts.custom()
                .loadKeyMaterial(keyStore, Constants.JTS_WCHART_MCH_ID.toCharArray())//这里也是写密码的
                .build();
    } catch (KeyManagementException e) {
        e.printStackTrace();
    } catch (KeyStoreException e) {
        e.printStackTrace();
    } catch (UnrecoverableKeyException e) {
        e.printStackTrace();
    }
    SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(
            sslcontext,
            new String[] { "TLSv1" },
            null,
            SSLConnectionSocketFactory.BROWSER_COMPATIBLE_HOSTNAME_VERIFIER);
    CloseableHttpClient httpclient = HttpClients.custom()
            .setSSLSocketFactory(sslsf)
            .build();
    try {
        HttpPost httpost = new HttpPost(url); // 设置响应头信息
        httpost.addHeader("Connection", "keep-alive");
        httpost.addHeader("Accept", "*/*");
        httpost.addHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
        httpost.addHeader("Host", "api.mch.weixin.qq.com");
        httpost.addHeader("X-Requested-With", "XMLHttpRequest");
        httpost.addHeader("Cache-Control", "max-age=0");
        httpost.addHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0) ");
        httpost.setEntity(new StringEntity(xmlInfo, "UTF-8"));
        CloseableHttpResponse response = null;
        response = httpclient.execute(httpost);
        try {
            HttpEntity entity = response.getEntity();
            String jsonStr = null;
                jsonStr = EntityUtils.toString(response.getEntity(), "UTF-8");
                EntityUtils.consume(entity);
            return jsonStr;
        } finally {
                response.close();
        }
    } finally {
            httpclient.close();
    }
}

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