Java后台实现微信支付和微信退款

都是我自己工作中开发的，亲测可用，不喜勿喷。

controller中我是这么写的，你们需要根据自己的业务需求改动。ResponseBean是我自己封装的，你们可以改成你们想要的形式。

 /**
   * 微信统一下单接口
   * @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 {
      //初始化证书
      myConfig.initCert();
      wxpay= new WXPay(myConfig);
    } catch (Exception e) {
      e.printStackTrace();
    }
    //生成的随机字符串
    String nonce_str = WXPayUtil.generateNonceStr();
    //获取客户端的ip地址
    //获取本机的ip地址
    InetAddress addr = null;
    try {
      addr = InetAddress.getLocalHost();
    } catch (UnknownHostException e) {
      e.printStackTrace();
    }
    //支付金额，需要转成字符串类型，否则后面的签名会失败
    String payOutMoney = WxMoney.changeY2F(String.valueOf(req.get(\"money\")));
    String tradeName = (String) req.get(\"tradeName\");
    if(tradeName!=null&&tradeName.length()>0){

    }else{
      tradeName = \"课程支付\";
    }
    String body = tradeName;
    //商户订单号
    String out_trade_no= WXPayUtil.generateNonceStr();
    //统一下单接口参数
    HashMap<String, String> data = new HashMap<String, String>();
    data.put(\"appid\", 你的appid);
    data.put(\"mch_id\", 商户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\", 回调地址);
    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\");
          //这边要将返回的时间戳转化成字符串，不然小程序端调用wx.requestPayment方法会报签名错误
          resultMap.put(\"timeStamp\", timeStamp + \"\");
          //再次签名，这个签名用于小程序端调用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(),\"微信支付失败\",\"微信支付失败\");
        return responseBean;
      }
    } catch (Exception e) {
      ResponseBean responseBean = new ResponseBean(HttpStatus.OK.value(),\"微信支付失败\",\"微信支付失败\");
      e.printStackTrace();
      return responseBean;
    }
  }

微信退款代码（需要传退款的订单id）

  public ResponseBean refund(Map<String, Object> req) {
    Map resultMap=new HashMap();
    String buyId = (String) req.get(\"buyId\");
    WXPay wxpay =null;
    try {
      myConfig.initCert();//初始化证书
      wxpay= new WXPay(myConfig);
    } catch (Exception e) {
      e.printStackTrace();
    }
    //生成的随机字符串
    String nonce_str = WXPayUtil.generateNonceStr();
    //获取客户端的ip地址
    //获取本机的ip地址
    InetAddress addr = null;
    try {
      addr = InetAddress.getLocalHost();
    } catch (UnknownHostException e) {
      e.printStackTrace();
    }
    //支付金额，需要转成字符串类型，否则后面的签名会失败
//    int total_fee= (int) req.get(\"money\");
    String payOutMoney = WxMoney.changeY2F(String.valueOf(req.get(\"money\")));

//    String body = (String) req.get(\"z\");
    //商户订单号
    String out_trade_no= WXPayUtil.generateNonceStr();
    //统一下单接口参数
    HashMap<String, String> data = new 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);//微信订单号
      data.put(\"out_refund_no\", out_trade_no);//商户退款单号
      data.put(\"total_fee\",payOutMoney);//支付金额，微信支付提交的金额是不能带小数点的，且是以分为单位,这边需要转成字符串类型，否则后面的签名会失败
      data.put(\"refund_fee\",payOutMoney);//退款总金额,订单总金额,单位为分,只能为整数
      //MD5运算生成签名，这里是第一次签名，用于调用统一下单接口
      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(),\"微信退款失败\",\"微信支付失败\");
        return responseBean;
      }


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

需要用到的工具类

Java后台实现微信支付和微信退款

然后在MyConfig中配置一下你们的小程序参数就行了，如果需要添加退款功能必须配置商户证书（对应在你项目中的位置）。不需要的话就把initCert方法去掉。

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

  private byte[] certData;


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

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

  @Override
  public String getKey() {
    return \"商户秘钥\";
  }

  @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\";//从微信商户平台下载的安全证书存放的目录
    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();
  }
}

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