微信支付流程

都是我自己工作中開發的，親測可用，不喜勿噴。

controller中我是這麼寫的，你們需要根據自己的業務需求改動。ResponseBean是我自己封裝的，你們可以改成你們想要的形式。

 /**
   * 微信統一下單介面
   * @return
   */
  @RequestMapping(value = "/doUnifiedOrder",method = RequestMethod.POST)
  public ResponseBean doUnifiedOrder(@RequestBody Map<String,Object> req) {
    Map resultMap=new HashMap();
    String openid = (String) req.get("openId");

    WXPay wxpay =null;

    try {
      //初始化證書
      myConfig.initCert();
      wxpay= new WXPay(myConfig);
    } catch (Exception e) {
      e.printStackTrace();
    }
    //生成的隨機字串
    String nonce_str = WXPayUtil.generateNonceStr();
    //獲取客戶端的ip地址
    //獲取本機的ip地址
    InetAddress addr = null;
    try {
      addr = InetAddress.getLocalHost();
    } catch (UnknownHostException e) {
      e.printStackTrace();
    }
    //支付金額，需要轉成字串型別，否則後面的簽名會失敗
    String payOutMoney = WxMoney.changeY2F(String.valueOf(req.get("money")));
    String tradeName = (String) req.get("tradeName");
    if(tradeName!=null&&tradeName.length()>0){

    }else{
      tradeName = "課程支付";
    }
    String body = tradeName;
    //商戶訂單號
    String out_trade_no= WXPayUtil.generateNonceStr();
    //統一下單介面引數
    HashMap<String,String> data = new HashMap<String,String>();
    data.put("appid",你的appid);
    data.put("mch_id",商戶id);
    data.put("nonce_str",nonce_str);
    data.put("body",body);
    data.put("out_trade_no",out_trade_no);
    data.put("total_fee",payOutMoney);
    data.put("spbill_create_ip","127.0.0.1");
    data.put("notify_url",回撥地址);
    data.put("trade_type","JSAPI");
    data.put("openid",openid);
    try {
      Map<String,String> rMap = wxpay.unifiedOrder(data);
      String return_code = (String) rMap.get("return_code");
      String result_code = (String) rMap.get("result_code");
      String nonceStr = WXPayUtil.generateNonceStr();
      resultMap.put("nonceStr",nonceStr);
      Long timeStamp = System.currentTimeMillis() / 1000;
      if ("SUCCESS".equals(return_code) && return_code.equals(result_code)) {
          String prepayid = rMap.get("prepay_id");
          resultMap.put("package","prepay_id="+prepayid);
          resultMap.put("signType","MD5");
          //這邊要將返回的時間戳轉化成字串，不然小程式端呼叫wx.requestPayment方法會報簽名錯誤
          resultMap.put("timeStamp",timeStamp + "");
          //再次簽名，這個簽名用於小程式端呼叫wx.requesetPayment方法
          resultMap.put("appId",myConfig.getAppID());
          String sign = WXPayUtil.generateSignature(resultMap,myConfig.getKey());
          resultMap.put("paySign",sign);
          resultMap.put("out_trade_no",out_trade_no);
          ResponseBean responseBean = new ResponseBean(HttpStatus.OK.value(),"微信支付",resultMap);
          return responseBean;

      }else{
        ResponseBean responseBean = new ResponseBean(HttpStatus.OK.value(),"微信支付失敗","微信支付失敗");
        return responseBean;
      }
    } catch (Exception e) {
      ResponseBean responseBean = new ResponseBean(HttpStatus.OK.value(),"微信支付失敗");
      e.printStackTrace();
      return responseBean;
    }
  }

微信退款程式碼（需要傳退款的訂單id）

  public ResponseBean refund(Map<String,Object> req) {
    Map resultMap=new HashMap();
    String buyId = (String) req.get("buyId");
    WXPay wxpay =null;
    try {
      myConfig.initCert();//初始化證書
      wxpay= new WXPay(myConfig);
    } catch (Exception e) {
      e.printStackTrace();
    }
    //生成的隨機字串
    String nonce_str = WXPayUtil.generateNonceStr();
    //獲取客戶端的ip地址
    //獲取本機的ip地址
    InetAddress addr = null;
    try {
      addr = InetAddress.getLocalHost();
    } catch (UnknownHostException e) {
      e.printStackTrace();
    }
    //支付金額，需要轉成字串型別，否則後面的簽名會失敗
//    int total_fee= (int) req.get("money");
    String payOutMoney = WxMoney.changeY2F(String.valueOf(req.get("money")));

//    String body = (String) req.get("z");
    //商戶訂單號
    String out_trade_no= WXPayUtil.generateNonceStr();
    //統一下單介面引數
    HashMap<String,String>();

    try {
      data.put("appid",myConfig.getAppID());
      data.put("mch_id",myConfig.getMchID());
      data.put("nonce_str",nonce_str);
      data.put("sign_type","MD5");
      data.put("out_trade_no",buyId);//微信訂單號
      data.put("out_refund_no",out_trade_no);//商戶退款單號
      data.put("total_fee",payOutMoney);//支付金額，微信支付提交的金額是不能帶小數點的，且是以分為單位,這邊需要轉成字串型別，否則後面的簽名會失敗
      data.put("refund_fee",payOutMoney);//退款總金額,訂單總金額,單位為分,只能為整數
      //MD5運算生成簽名，這裡是第一次簽名，用於呼叫統一下單介面
      String sign = WXPayUtil.generateSignature(data,myConfig.getKey());
      data.put("sign",sign);

      Map<String,String> rMap = wxpay.refund(data);
      String return_code = (String) rMap.get("return_code");
      String result_code = (String) rMap.get("result_code");

      Long timeStamp = System.currentTimeMillis() / 1000;
      if ("SUCCESS".equals(return_code) && return_code.equals(result_code)) {

        ResponseBean responseBean = new ResponseBean(HttpStatus.OK.value(),"微信退款成功",rMap);
        return responseBean;

      }else{
        ResponseBean responseBean = new ResponseBean(HttpStatus.OK.value(),"微信退款失敗","微信支付失敗");
        return responseBean;
      }


    } catch (Exception e) {
      ResponseBean responseBean = new ResponseBean(HttpStatus.OK.value(),"微信支付失敗");
      e.printStackTrace();
      return responseBean;
    }
  }

需要用到的工具類

然後在MyConfig中配置一下你們的小程式引數就行了，如果需要新增退款功能必須配置商戶證書（對應在你專案中的位置）。不需要的話就把initCert方法去掉。

public class MyConfig extends WXPayConfig {
  @Value("${res.imgPath}")
  public String imgPath;

  private byte[] certData;


  @Override
  public String getAppID() {
    return "你的小程式id";
  }

  @Override
  public String getMchID() {
    return "商戶id";
  }

  @Override
  public String getKey() {
    return "商戶祕鑰";
  }

  @Override
  public InputStream getCertStream() {
    ByteArrayInputStream certBis = new ByteArrayInputStream(this.certData);
    return certBis;
  }

  @Override
  public int getHttpConnectTimeoutMs() {
    return 8000;
  }

  @Override
  public int getHttpReadTimeoutMs() {
    return 10000;
  }

  @Override
  IWXPayDomain getWXPayDomain() {
    return new IWXPayDomain() {
      @Override
      public void report(String domain,long elapsedTimeMillis,Exception ex) {
      }

      @Override
      public DomainInfo getDomain(WXPayConfig config) {
        return new DomainInfo("api.mch.weixin.qq.com",false);
      }
    };
  }
  
  @Override
  public void initCert() throws Exception {
    String certPath = this.imgPath+"/upload/cert/"+"apiclient_cert.p12";//從微信商戶平臺下載的安全證書存放的目錄
    System.out.println(certPath);
    File file = new File(certPath);
    InputStream certStream = new FileInputStream(file);
    this.certData = new byte[(int) file.length()];
    certStream.read(this.certData);
    certStream.close();
  }
}

到此這篇關於Java後臺實現微信支付和微信退款的文章就介紹到這了,更多相關Java 微信支付和微信退款內容請搜尋我們以前的文章或繼續瀏覽下面的相關文章希望大家以後多多支援我們！