微信退款

public class RefundRequest {

  @ApiModelProperty(value = "用户id")
  @JsonProperty(value = "user_id")
  private Integer userId;

  @ApiModelProperty(value = "支付订单交易号")
  @JsonProperty(value = "trade_no")
  private String tradeNo;

  @ApiModelProperty(value = "退款金额(/分)")
  private Integer amount;

  @ApiModelProperty(value = "退款原因")
  private String reason;

  @ApiModelProperty(value = "自定义信息")
  private Map<String, Object> optional;

  @ApiModelProperty(value = "产品标识")
  @JsonProperty(value = "product_key")
  private String productKey;

  @ApiModelProperty(value = "行为标识")
  private String attribute;

  @ApiModelProperty(value = "退款单号")
  private String refundNo;
}

微信退款

 public String refundWX(RefundRequest refundRequest) {

    String refundNo = generateBillNoService.randomRefundNo(12);
    String appId="";
    String mchid="";
    String appKey="";
    //微信退款

    SortedMap<String, Object> sortedMapmap = new TreeMap<>();
    sortedMapmap.put("appid", appId);
    sortedMapmap.put("mch_id", mchid);
    sortedMapmap.put("nonce_str", generateBillNoService.generateRandomString(12));
    sortedMapmap.put("out_trade_no", refundRequest.getTradeNo());
    sortedMapmap.put("total_fee", refundRequest.getAmount().toString());
    sortedMapmap.put("refund_fee", refundRequest.getAmount().toString());
    sortedMapmap.put("out_refund_no", refundNo);
    sortedMapmap.put("notify_url", "回调地址");
    String sign = weiXinProxy.createSign("UTF-8", sortedMapmap, appKey);
    sortedMapmap.put("sign", sign);
    Map<String, String> map = weiXinProxy.refundOrdes(Constant.WX_REFUND_URL, sortedMapmap, mchid);
    log.info("申请退款结果：" + map);
    //校验（方法在上个文章里）
    DefaultResponse defaultResponse = weiXinProxy.checkResultInfo(map, appKey);
    if (defaultResponse.getCode() != 0) {
      log.info(defaultResponse.getMessage());
      return "FAIL";
    }
    return "SUCCESS";
  }

调用微信 证书验证

public Map<String, String> refundOrdes(@RequestBody String url, SortedMap<String, Object> request, String muchid) {
    Map<String, String> map = new HashMap<>();
    try {
      RestTemplate restTemplate = new RestTemplate(certificateVerification(muchid));
      log.info("证书验证成功");
      map = doXMLParse(new String(restTemplate.postForObject(url, getRequestXml(request), String.class).getBytes("ISO-8859-1"), "UTF-8"));
    } catch (Exception e) {
      e.printStackTrace();
      log.info("证书验证失败");
    }
    return map;
  }
//验证证书
  public HttpComponentsClientHttpRequestFactory certificateVerification(String muchid) throws Exception {
    //PKCS12证书 是从微信商户平台-账户设置-API安全 中下载的
    KeyStore keyStore = KeyStore.getInstance("PKCS12");
    //指向你的证书的路径
    InputStream inputStream = this.getClass().getResourceAsStream("/apiclient_cert.p12");

    try {
      //默认密码MCHID
      keyStore.load(inputStream, muchid.toCharArray());
    } finally {
      inputStream.close();
    }
    //SSL通信双向认证
    SSLContext sslContext = SSLContexts.custom().loadKeyMaterial(keyStore, muchid.toCharArray()).build();
    SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslContext, new String[]{"TLSv1"}, null, NoopHostnameVerifier.INSTANCE);
    CloseableHttpClient httpClient = HttpClients.custom().setSSLSocketFactory(sslsf).build();

    return new HttpComponentsClientHttpRequestFactory(httpClient);
  }

退款结果回调

  //微信退款通知
  public String callBackWXRefund(String xml) {
    Map<String, String> map = new HashMap<>();
    try {
      if (xml == null)
        return "FAIL";
      map = weiXinProxy.doXMLParse(xml);
      log.info(map);


      if (map.get("return_code").equals("SUCCESS")) {
        //base64解码
        byte[] decodeReqInfo = Base64.decode(map.get("req_info"));
        log.info(decodeReqInfo);

        String appKey ="";
        //对商户key做md5，得到32位小写key
        String md5Key = weiXinProxy.MD5Encode(appKey, "UTF-8").toLowerCase();
        //PKCS7Padding填充 AES-256-ECB解密 注意：jdk版本低 会报Illegal key size or default parameters
        Security.addProvider(new BouncyCastleProvider());

        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC");
        cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(md5Key.getBytes(), "AES"));
        String reqInfo = new String(cipher.doFinal(decodeReqInfo),"utf-8");
        log.info(reqInfo);

        Map<String, String> reqInfoMap = weiXinProxy.doXMLParse(reqInfo);

        log.info("退款结果回调：" + reqInfoMap);


      }
      return "<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>";
    } catch (Exception e) {
      log.info(e.getMessage());
    }
    return "FAIL";
  }

}