Java微信退款開發(fā)

更新時間：2018年09月29日 10:14:10 作者：thinkhui

這篇文章主要為大家詳細介紹了Java微信退款開發(fā)的相關(guān)資料，具有一定的參考價值，感興趣的小伙伴們可以參考一下

一、下載證書并導入到系統(tǒng)

微信支付接口中，涉及資金回滾的接口會使用到商戶證書，包括退款、撤銷接口。商家在申請微信支付成功后，可以按照以下路徑下載：微信商戶平臺(pay.weixin.qq.com)-->賬戶設(shè)置-->API安全-->證書下載。

下載的時候需要手機驗證及登錄密碼。下載后找到apiclient_cert.p12這個證書，雙擊導入，導入的時候提示輸入密碼，這個密碼就是商戶ID,且必須是在自己的商戶平臺下載的證書。否則會出現(xiàn)密碼錯誤的提示：

導入正確的提示：

二、編寫代碼

首先初始化退款接口中的請求參數(shù)，如微信訂單號transaction_id（和商戶訂單號只需要知道一個）、訂單金額total_fee等；其次調(diào)用MobiMessage中的RefundResData2xml方法解析成需要的類型；最后調(diào)用RefundRequest類的httpsRequest方法觸發(fā)請求。

/**
 * 處理退款請求
 * @param request
 * @return
 * @throws Exception
 */
 @RequestMapping("/refund")
 @ResponseBody
 public JsonApi refund(HttpServletRequest request) throws Exception {
  //獲得當前目錄
  String path = request.getSession().getServletContext().getRealPath("/");
  LogUtils.trace(path);
 
  Date now = new Date();
  SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMddHHmmss");//可以方便地修改日期格式
  String outRefundNo = "NO" + dateFormat.format( now );
 
  //獲得退款的傳入?yún)?shù)
  String transactionID = "4008202001201609012791655620";
  String outTradeNo = "20160901141024";
  Integer totalFee = 1;
  Integer refundFee = totalFee;
 
  RefundReqData refundReqData = new RefundReqData(transactionID,outTradeNo,outRefundNo,totalFee,refundFee);
 
  String info = MobiMessage.RefundReqData2xml(refundReqData).replaceAll("__", "_");
  LogUtils.trace(info);
 
  try {
   RefundRequest refundRequest = new RefundRequest();
   String result = refundRequest.httpsRequest(WxConfigure.REFUND_API, info, path);
   LogUtils.trace(result);
 
   Map<String, String> getMap = MobiMessage.parseXml(new String(result.toString().getBytes(), "utf-8"));
   if("SUCCESS".equals(getMap.get("return_code")) && "SUCCESS".equals(getMap.get("return_msg"))){
    return new JsonApi();
   }else{
    //返回錯誤描述
    return new JsonApi(getMap.get("err_code_des"));
   }
  }catch(Exception e){
   e.printStackTrace();
   return new JsonApi();
  }
}

初始化退款接口需要的數(shù)據(jù)，隱藏了get和set方法。

public class RefundReqData {
 
 //每個字段具體的意思請查看API文檔
 private String appid = "";
 private String mch_id = "";
 private String nonce_str = "";
 private String sign = "";
 private String transaction_id = "";
 private String out_trade_no = "";
 private String out_refund_no = "";
 private int total_fee = 0;
 private int refund_fee = 0;
 private String op_user_id = "";
 
 /**
  * 請求退款服務(wù)
  * @param transactionID 是微信系統(tǒng)為每一筆支付交易分配的訂單號，通過這個訂單號可以標識這筆交易，它由支付訂單API支付成功時返回的數(shù)據(jù)里面獲取到。建議優(yōu)先使用
  * @param outTradeNo 商戶系統(tǒng)內(nèi)部的訂單號,transaction_id 、out_trade_no 二選一，如果同時存在優(yōu)先級：transaction_id>out_trade_no
  * @param outRefundNo 商戶系統(tǒng)內(nèi)部的退款單號，商戶系統(tǒng)內(nèi)部唯一，同一退款單號多次請求只退一筆
  * @param totalFee 訂單總金額，單位為分
  * @param refundFee 退款總金額，單位為分
  */
 public RefundReqData(String transactionID,String outTradeNo,String outRefundNo,int totalFee,int refundFee){
 
  //微信分配的公眾號ID（開通公眾號之后可以獲取到）
  setAppid(WxConfigure.AppId);
 
  //微信支付分配的商戶號ID（開通公眾號的微信支付功能之后可以獲取到）
  setMch_id(WxConfigure.Mch_id);
 
  //transaction_id是微信系統(tǒng)為每一筆支付交易分配的訂單號，通過這個訂單號可以標識這筆交易，它由支付訂單API支付成功時返回的數(shù)據(jù)里面獲取到。
  setTransaction_id(transactionID);
 
  //商戶系統(tǒng)自己生成的唯一的訂單號
  setOut_trade_no(outTradeNo);
 
  setOut_refund_no(outRefundNo);
 
  setTotal_fee(totalFee);
 
  setRefund_fee(refundFee);
 
  setOp_user_id(WxConfigure.Mch_id);
 
  //隨機字符串，不長于32 位
  setNonce_str(StringUtil.generateRandomString(16));
 
 
  //根據(jù)API給的簽名規(guī)則進行簽名
  SortedMap<Object, Object> parameters = new TreeMap<Object, Object>();
  parameters.put("appid", appid);
  parameters.put("mch_id", mch_id);
  parameters.put("nonce_str", nonce_str);
  parameters.put("transaction_id", transaction_id);
  parameters.put("out_trade_no", out_trade_no);
  parameters.put("out_refund_no", out_refund_no);
  parameters.put("total_fee", total_fee);
  parameters.put("refund_fee", refund_fee);
  parameters.put("op_user_id", op_user_id);
 
 
  String sign = DictionarySort.createSign(parameters);
  setSign(sign); //把簽名數(shù)據(jù)設(shè)置到Sign這個屬性中
 
 }

MobiMessage實現(xiàn)json數(shù)據(jù)類型和xml數(shù)據(jù)之間的轉(zhuǎn)換。

public class MobiMessage {
 
 public static Map<String,String> xml2map(HttpServletRequest request) throws IOException, DocumentException {
  Map<String,String> map = new HashMap<String, String>();
  SAXReader reader = new SAXReader();
  InputStream inputStream = request.getInputStream();
  Document document = reader.read(inputStream);
  Element root = document.getRootElement();
  List<Element> list = root.elements();
  for(Element e:list){
   map.put(e.getName(), e.getText());
  }
  inputStream.close();
  return map;
 }
 
 
 //訂單轉(zhuǎn)換成xml
 public static String JsApiReqData2xml(JsApiReqData jsApiReqData){
  /*XStream xStream = new XStream();
  xStream.alias("xml",productInfo.getClass());
  return xStream.toXML(productInfo);*/
  MobiMessage.xstream.alias("xml",jsApiReqData.getClass());
  return MobiMessage.xstream.toXML(jsApiReqData);
 }
 
 public static String RefundReqData2xml(RefundReqData refundReqData){
  /*XStream xStream = new XStream();
  xStream.alias("xml",productInfo.getClass());
  return xStream.toXML(productInfo);*/
  MobiMessage.xstream.alias("xml",refundReqData.getClass());
  return MobiMessage.xstream.toXML(refundReqData);
 }
 
 public static String class2xml(Object object){
 
  return "";
 }
 public static Map<String, String> parseXml(String xml) throws Exception {
  Map<String, String> map = new HashMap<String, String>();
  Document document = DocumentHelper.parseText(xml);
  Element root = document.getRootElement();
  List<Element> elementList = root.elements();
  for (Element e : elementList)
   map.put(e.getName(), e.getText());
  return map;
 }
 
 //擴展xstream，使其支持CDATA塊
 private static XStream xstream = new XStream(new XppDriver() {
  public HierarchicalStreamWriter createWriter(Writer out) {
   return new PrettyPrintWriter(out) {
    // 對所有xml節(jié)點的轉(zhuǎn)換都增加CDATA標記
    boolean cdata = true;
 
    //@SuppressWarnings("unchecked")
    public void startNode(String name, Class clazz) {
     super.startNode(name, clazz);
    }
 
    protected void writeText(QuickWriter writer, String text) {
     if (cdata) {
      writer.write("<![CDATA[");
      writer.write(text);
      writer.write("]]>");
     } else {
      writer.write(text);
     }
    }
   };
  }
 });
 
 
}

RefundRequest類中initCert方法加載證書到系統(tǒng)中，其中證書地址如下：

public static String certLocalPath = "/WEB-INF/cert/apiclient_cert.p12";

RefundRequest類中httpsRequest方法調(diào)用微信接口，觸發(fā)請求。

/**
 * User: rizenguo
 * Date: 2014/10/29
 * Time: 14:36
 */
public class RefundRequest {
 
 //連接超時時間，默認10秒
 private int socketTimeout = 10000;
 
 //傳輸超時時間，默認30秒
 private int connectTimeout = 30000;
 
 //請求器的配置
 private RequestConfig requestConfig;
 
 //HTTP請求器
 private CloseableHttpClient httpClient;
 
 /**
  * 加載證書
  * @param path
  * @throws IOException
  * @throws KeyStoreException
  * @throws UnrecoverableKeyException
  * @throws NoSuchAlgorithmException
  * @throws KeyManagementException
  */
 private void initCert(String path) throws IOException, KeyStoreException, UnrecoverableKeyException, NoSuchAlgorithmException, KeyManagementException {
  //拼接證書的路徑
  path = path + WxConfigure.certLocalPath;
  KeyStore keyStore = KeyStore.getInstance("PKCS12");
 
  //加載本地的證書進行https加密傳輸
  FileInputStream instream = new FileInputStream(new File(path));
  try {
   keyStore.load(instream, WxConfigure.Mch_id.toCharArray()); //加載證書密碼，默認為商戶ID
  } catch (CertificateException e) {
   e.printStackTrace();
  } catch (NoSuchAlgorithmException e) {
   e.printStackTrace();
  } finally {
   instream.close();
  }
 
  // Trust own CA and all self-signed certs
  SSLContext sslcontext = SSLContexts.custom()
    .loadKeyMaterial(keyStore, WxConfigure.Mch_id.toCharArray())  //加載證書密碼，默認為商戶ID
    .build();
  // Allow TLSv1 protocol only
  SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(
    sslcontext,
    new String[]{"TLSv1"},
    null,
    SSLConnectionSocketFactory.BROWSER_COMPATIBLE_HOSTNAME_VERIFIER);
 
  httpClient = HttpClients.custom()
    .setSSLSocketFactory(sslsf)
    .build();
 
  //根據(jù)默認超時限制初始化requestConfig
  requestConfig = RequestConfig.custom().setSocketTimeout(socketTimeout).setConnectTimeout(connectTimeout).build();
 
 }
 
 
 /**
  * 通過Https往API post xml數(shù)據(jù)
  * @param url API地址
  * @param xmlObj 要提交的XML數(shù)據(jù)對象
  * @param path 當前目錄，用于加載證書
  * @return
  * @throws IOException
  * @throws KeyStoreException
  * @throws UnrecoverableKeyException
  * @throws NoSuchAlgorithmException
  * @throws KeyManagementException
  */
 public String httpsRequest(String url, String xmlObj, String path) throws IOException, KeyStoreException, UnrecoverableKeyException, NoSuchAlgorithmException, KeyManagementException {
  //加載證書
  initCert(path);
 
  String result = null;
 
  HttpPost httpPost = new HttpPost(url);
 
  //得指明使用UTF-8編碼，否則到API服務(wù)器XML的中文不能被成功識別
  StringEntity postEntity = new StringEntity(xmlObj, "UTF-8");
  httpPost.addHeader("Content-Type", "text/xml");
  httpPost.setEntity(postEntity);
 
  //設(shè)置請求器的配置
  httpPost.setConfig(requestConfig);
 
  try {
   HttpResponse response = httpClient.execute(httpPost);
 
   HttpEntity entity = response.getEntity();
 
   result = EntityUtils.toString(entity, "UTF-8");
 
  } catch (ConnectionPoolTimeoutException e) {
   LogUtils.trace("http get throw ConnectionPoolTimeoutException(wait time out)");
 
  } catch (ConnectTimeoutException e) {
   LogUtils.trace("http get throw ConnectTimeoutException");
 
  } catch (SocketTimeoutException e) {
    LogUtils.trace("http get throw SocketTimeoutException");
 
  } catch (Exception e) {
    LogUtils.trace("http get throw Exception");
 
  } finally {
   httpPost.abort();
  }
 
  return result;
 }
}

以上就是本文的全部內(nèi)容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。

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