java微信公众号支付开发之现金红包

我们先来看看公众号发放现金红包的效果:

需要调用商户平台的接口,接口发放规则如下:

1.发送频率限制——默认1800/min
2.发送个数上限——按照默认1800/min算
3.金额上限——根据传入场景id不同默认上限不同，可以在商户平台产品设置进行设置和申请，最大不大于4999元/个
4.其他的“量”上的限制还有哪些？——用户当天的领取上限次数,默认是10
5.如果量上满足不了我们的需求，如何提高各个上限？——金额上限和用户当天领取次数上限可以在商户平台进行设置
注意-红包金额大于200时，请求参数scene_id必传，参数说明见下文。
注意2-根据监管要求，新申请商户号使用现金红包需要满足两个条件：1、入驻时间超过90天 2、连续正常交易30天。

请求Url https://api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack
是否需要证书 是（证书及使用说明详见商户证书）
请求方式 POST

请求数据示例：

<xml>

<sign><![CDATA[E1EE61A91C8E90F299DE6AE075D60A2D]]></sign>

<mch_billno><![CDATA[0010010404201411170000046545]]></mch_billno>

<mch_id><![CDATA[888]]></mch_id>

<wxappid><![CDATA[wxcbda96de0b165486]]></wxappid>
<send_name><![CDATA[send_name]]></send_name>
<re_openid><![CDATA[onqOjjmM1tad-3ROpncN-yUfa6uI]]></re_openid>
<total_amount><![CDATA[200]]></total_amount>
<total_num><![CDATA[1]]></total_num>
<wishing><![CDATA[恭喜发财]]></wishing>

<client_ip><![CDATA[127.0.0.1]]></client_ip>
<act_name><![CDATA[新年红包]]></act_name>
<remark><![CDATA[新年红包]]></remark>
<scene_id><![CDATA[PRODUCT_2]]></scene_id>
<consume_mch_id><![CDATA[10000097]]></consume_mch_id>
<nonce_str><![CDATA[50780e0cca98c8c8e814883e5caa672e]]></nonce_str>

<risk_info>posttime%3d123123412%26clientversion%3d234134%26mobile%3d122344545%26deviceid%3dIOS</risk_info>

</xml>

接口需要调用商户平台的证书，证书需要去商户平台下载：

然后在接口中使用证书，首先我们新建一个WeixinSSL 类

@Component
public class WeiXinSSL {

  /**
   * 证书类型
   */
  @Value("${werchant.storekey}")
  private String storekey;

  /**
   * 文件路径
   */
  @Value("${werchant.ssLfile}")
  private String ssLfile;

  /**
   * 商户号
   */
  @Value("${werchant.merchantNumber}")
  private String merchantNumber;

  public String getStorekey() {
    return storekey;
  }

  public void setStorekey(String storekey) {
    this.storekey = storekey;
  }

  public String getSsLfile() {
    return ssLfile;
  }

  public void setSsLfile(String ssLfile) {
    this.ssLfile = ssLfile;
  }

  public String getMerchantNumber() {
    return merchantNumber;
  }

  public void setMerchantNumber(String merchantNumber) {
    this.merchantNumber = merchantNumber;
  }
}

封装HttpClientSSL 类实现 https 请求加证书:

@Component
public class HttpClientSSL {

  @Autowired
  private WeiXinSSL weiXinSSL;

  // 请求超时时间(毫秒) 5秒
  public static RequestConfig requestConfig;

  // 响应超时时间(毫秒) 60秒
  public static int HTTP_RESPONSE_TIMEOUT = 60 * 1000;

  // httpClient字符编码
  public static String encoding = "UTF-8";

  public static RequestConfig getRequestConfig() {
    return RequestConfig.custom().setConnectTimeout(5 * 1000)
        .setConnectionRequestTimeout(HTTP_RESPONSE_TIMEOUT).build();
  }

  public static void setRequestConfig(RequestConfig requestConfig) {
    HttpClientSSL.requestConfig = requestConfig;
  }

  /**
   * https请求伪造证书
   * @return
   */
  public CloseableHttpClient defaultSSLClient() {
    SSLContext sslContext = null;
    try {
      new SSLContextBuilder().loadTrustMaterial(null,new TrustStrategy(){
        @Override
        public boolean isTrusted(X509Certificate[] chain, String authType)
            throws java.security.cert.CertificateException {
          return false;
        }
      });
    } catch (NoSuchAlgorithmException | KeyStoreException e) {
      e.printStackTrace();
    }
    SSLConnectionSocketFactory factory = new SSLConnectionSocketFactory(sslContext);
    return HttpClients.custom().setSSLSocketFactory(factory).build();
  }

  /**
   * https请求加证书
   * @return
   */
  public CloseableHttpClient defaultSSLClientFile() {
    if (this.weiXinSSL == null){
      return this.defaultSSLClient();
    }
    FileInputStream inputStream = null;
    KeyStore keyStore = null;
    try {
      // ssl类型
      keyStore = KeyStore.getInstance(weiXinSSL.getStorekey());
      // ssl文件
      inputStream = new FileInputStream(weiXinSSL.getSsLfile());
      // 设置ssl密码
      keyStore.load(inputStream,weiXinSSL.getMerchantNumber().toCharArray());
    } catch (KeyStoreException | NoSuchAlgorithmException | CertificateException | IOException e1) {
      e1.printStackTrace();
    } finally {
      try {
        inputStream.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
    SSLContext sslContext = null;
    try {
      sslContext = SSLContexts.custom().loadKeyMaterial(keyStore,weiXinSSL.getMerchantNumber().toCharArray()).build();
    } catch (UnrecoverableKeyException | NoSuchAlgorithmException | KeyStoreException | KeyManagementException e) {
      e.printStackTrace();
    }

    SSLConnectionSocketFactory factory = new SSLConnectionSocketFactory(sslContext, new String[] { "TLSv1" }, null,
        SSLConnectionSocketFactory.BROWSER_COMPATIBLE_HOSTNAME_VERIFIER);
    return HttpClients.custom().setSSLSocketFactory(factory).build();
  }

  /**
   * 封装发送请求的方法
   * @throws UnsupportedEncodingException
   */
  public String send(String url, String data, CloseableHttpClient closeableHttpClient)
      throws UnsupportedEncodingException {

    CloseableHttpClient client = closeableHttpClient;
    HttpPost httpPost = new HttpPost(URLDecoder.decode(url, encoding));
    httpPost.addHeader("Connection", "keep-alive");
    httpPost.addHeader("Accept", "*/*");
    httpPost.addHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
    httpPost.addHeader("Host", "api.mch.weixin.qq.com");
    httpPost.addHeader("X-Requested-With", "XMLHttpRequest");
    httpPost.addHeader("Cache-Control", "max-age=0");
    httpPost.addHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0) ");
    httpPost.setConfig(this.getRequestConfig());// 设置超时时间
    CloseableHttpResponse response = null;

    // 参数放入
    StringEntity entity = new StringEntity(data, encoding);
    entity.setContentEncoding(encoding);
    entity.setContentType("application/xml");
    httpPost.setEntity(entity);

    try {
      response = client.execute(httpPost);
      if (response.getStatusLine().getStatusCode() == 200) {
        HttpEntity httpEntity = (HttpEntity) response.getEntity();
        if (response != null) {
          return EntityUtils.toString(httpEntity,encoding);
        }
      }
    } catch (IOException e) {
      e.printStackTrace();
    }
    return null;
  }

}

这样我们就封装了一个https请求加证书的实体类，接下来我们生成请求微信红包接口：
https://api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack 的参数签名：

/**
* 红包参数实体类
 * @throws UnsupportedEncodingException
 */
@Component
public class SendRedPack implements Serializable{

  /**
   *
   */
  private static final long serialVersionUID = -1000489228099916099L;

  private String nonce_str;// 随机字符串
  private String sign;// 签名
  private String mch_billno;// 商户订单号
  private String mch_id;// 商户号
  private String wxappid;// 公众账号
  private String send_name;// 商户名称
  private String re_openid;// 用户
  private int total_amount;// 付款金额 单位：分
  private int total_num;// 红包发放总人数
  private String wishing;// 红包祝福语
  private String client_ip;// Ip地址
  private String act_name;// 活动名称
  private String remark;// 备注
  public String getNonce_str() {
    return nonce_str;
  }
  public void setNonce_str(String nonce_str) {
    this.nonce_str = nonce_str;
  }
  public String getSign() {
    return sign;
  }
  public void setSign(String sign) {
    this.sign = sign;
  }
  public String getMch_billno() {
    return mch_billno;
  }
  public void setMch_billno(String mch_billno) {
    this.mch_billno = mch_billno;
  }
  public String getMch_id() {
    return mch_id;
  }
  public void setMch_id(String mch_id) {
    this.mch_id = mch_id;
  }
  public String getWxappid() {
    return wxappid;
  }
  public void setWxappid(String wxappid) {
    this.wxappid = wxappid;
  }
  public String getSend_name() {
    return send_name;
  }
  public void setSend_name(String send_name) {
    this.send_name = send_name;
  }
  public String getRe_openid() {
    return re_openid;
  }
  public void setRe_openid(String re_openid) {
    this.re_openid = re_openid;
  }
  public int getTotal_amount() {
    return total_amount;
  }
  public void setTotal_amount(int total_amount) {
    this.total_amount = total_amount;
  }
  public int getTotal_num() {
    return total_num;
  }
  public void setTotal_num(int total_num) {
    this.total_num = total_num;
  }
  public String getWishing() {
    return wishing;
  }
  public void setWishing(String wishing) {
    this.wishing = wishing;
  }
  public String getClient_ip() {
    return client_ip;
  }
  public void setClient_ip(String client_ip) {
    this.client_ip = client_ip;
  }
  public String getAct_name() {
    return act_name;
  }
  public void setAct_name(String act_name) {
    this.act_name = act_name;
  }
  public String getRemark() {
    return remark;
  }
  public void setRemark(String remark) {
    this.remark = remark;
  }
}

接下来是发送红包的控制器：

/**
 * 领红包控制器
 * @author zengliang
 */
@Controller
@RequestMapping(value="/redenveLopesReceive")
public class RedEnvelopesReceiveController {

  //微信唯一标识
  @Value("${weixin.appid}")
  private String appid;

  //微信开发者密码标识
  @Value("${weixin.appsecret}")
  public String appsecret;

  @Autowired
  private SendRedPack sendredpack;

  @Autowired
  private HttpClientSSL httpclientssl;

  /**
   * 发送XML参数
   * @author zengliang
   */
  @ResponseBody
  @RequestMapping(value="/sendXml")
  public String sendXml(String openid,Long redenveLopes_id
      ,String mch_billno){
    RedenveLopes redenve = redenveLopesService.findOne(redenveLopes_id);

    XMLUtil xmlUtil= new XMLUtil();
    sendredpack.setAct_name(redenve.getAct_name());
    sendredpack.setNonce_str(xmlUtil.random());
    sendredpack.setRe_openid(openid);
    sendredpack.setClient_ip(redenve.getClient_ip());
    sendredpack.setMch_billno(mch_billno);
    sendredpack.setMch_id(redenve.getMch_id());
    String xx = redenve.getRemark();
    sendredpack.setRemark(StringUtils.isEmpty(xx) == false?xx:"空");
    sendredpack.setSend_name(redenve.getSend_name());
    sendredpack.setTotal_amount(redenve.getTotal_amount());
    sendredpack.setTotal_num(redenve.getTotal_num());
    sendredpack.setWishing(redenve.getWishing());
    sendredpack.setWxappid(redenve.getWxappidxx());
    //生成签名
    String params = this.createSendRedPackOrderSign(sendredpack,redenve.getStore_key());
    sendredpack.setSign(params);

    xmlUtil.xstream().alias("xml",sendredpack.getClass());
    //扩展xstream，使其支持CDATA块
    String requestXml = xmlUtil.xstream().toXML(sendredpack);

    String result;
    try {
      result = httpclientssl.send("https://api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack",requestXml,httpclientssl.defaultSSLClientFile());
      System.out.println("成功返回值"+result);
      return result;
    } catch (UnsupportedEncodingException e) {
      e.printStackTrace();
    }
    return null;
  }

/**
   * 生成签名
   * @param redPack
   * @return
   */
  public String createSendRedPackOrderSign(SendRedPack redPack,String storekey){
    StringBuffer sign = new StringBuffer();
    sign.append("act_name=").append(redPack.getAct_name());
    sign.append("&client_ip=").append(redPack.getClient_ip());
    sign.append("&mch_billno=").append(redPack.getMch_billno());
    sign.append("&mch_id=").append(redPack.getMch_id());
    sign.append("&nonce_str=").append(redPack.getNonce_str());
    sign.append("&re_openid=").append(redPack.getRe_openid());
    sign.append("&remark=").append(redPack.getRemark());
    sign.append("&send_name=").append(redPack.getSend_name());
    sign.append("&total_amount=").append(redPack.getTotal_amount());
    sign.append("&total_num=").append(redPack.getTotal_num());
    sign.append("&wishing=").append(redPack.getWishing());
    sign.append("&wxappid=").append(redPack.getWxappid());
    sign.append("&key=").append(storekey);
    return DigestUtils.md5Hex(sign.toString()).toUpperCase();
  }

}

然后我们需要用一个解析XML的工具类实现解析微信返回的XML

/**
 * 解析XML工具类
 * @author zengliang
 */
@Component
public class XMLUtil {

  /**
   * 解析微信返回的XML
   * @param xml
   * @return
   * @throws Exception
   */
  @SuppressWarnings("unchecked")
  public Map<String, String> parseXml(String xml)throws Exception {
    Map<String,String> map = new HashMap<String,String>();
    Document doc = null;
    try {
      doc = DocumentHelper.parseText(xml); // 将字符串转为XML
      Element rootElt = doc.getRootElement(); // 获取根节点
      List<Element> list = rootElt.elements();//获取根节点下所有节点
      for (Element element : list) { //遍历节点
        map.put(element.getName(), element.getText()); //节点的name为map的key，text为map的value
      }
    } catch (DocumentException e) {
      e.printStackTrace();
    } catch (Exception e) {
      e.printStackTrace();
    }
    return map;
  }

  /**
   * 扩展xstream，使其支持CDATA块
   */
   private XStream xstream = new XStream(new XppDriver(new NoNameCoder()) {
      @Override
      public HierarchicalStreamWriter createWriter(Writer out) {
          return new PrettyPrintWriter(out) {
          // 对所有xml节点的转换都增加CDATA标记
          boolean cdata = true;
          @Override
          @SuppressWarnings("rawtypes")
          public void startNode(String name, Class clazz) {
            super.startNode(name, clazz);
          }
          @Override
          public String encodeNode(String name) {
            return name;
          }
          @Override
          protected void writeText(QuickWriter writer, String text) {
            if (cdata) {
              writer.write("<![CDATA[");
              writer.write(text);
              writer.write("]]>");
            } else {
              writer.write(text);
            }
          }
          };
      }
   });
   private XStream inclueUnderlineXstream = new XStream(new DomDriver(null,new XmlFriendlyNameCoder("_-", "_")));
   public XStream getXstreamInclueUnderline() {
     return inclueUnderlineXstream;
   }

   public XStream xstream() {
     return xstream;
   }

   /**
   * 生成随机数
   * @return
   */
  public String random(){
    String random = UUID.randomUUID().toString().replace("-", "");
    return random;
  }
}

然后我们调用 sendXML 方法公众号就能向用户发送红包了。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。

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