java服务器端微信、支付宝支付和退款功能

工作需要，写了服务器端的支付和退款功能，包含微信和支付宝，网上也有很多demo可以借鉴，我把我的代码放出来，写的比较简单，有问题的欢迎指正，大家一起学习。

微信支付需要调用微信的统一下单接口，而支付宝不用。

我写的时候微信和支付宝都单独写了一个工具类，来调用支付，给前端返回需要的数据。

ps：支付是可以不需要服务器端的，不过为了安全一点点，所以前端需要调起支付的字段都直接从服务器端返回，前端拿到字段直接调起支付就可以了。

Map<String,String> map = new HashMap<String,String>();
switch (record.getCheckType()) {
 case 10:
 map = Alipay.prePay(record.getAmount(),out_trade_no);
 return ResponseData.ok(map);
 case 20:
 map = WXPay.prePay(record.getAmount(),out_trade_no);
 return ResponseData.ok(map);
}

10是支付宝支付，20是微信支付，map里存放前端需要的字段，直接返回给手机端

其中out_trade_no这个是商户自己生成的唯一订单号

public class WXPay {
 
 private static String url = String.format("https://api.mch.weixin.qq.com/pay/unifiedorder");
 
 //统一下单
 public static Map<String,String> prePay(BigDecimal amount,String out_trade_no){
 String entity = genProductArgs(amount,out_trade_no); 
 
 byte[] buf = Util.httpPost(url, entity);
 
 String content = new String(buf);
 Map<String,String> xml=decodeXml(content);
 return getRep(xml);
 }
 
 private static Map<String, String> getRep(Map<String, String> xml) {
 Random random = new Random();
 List<NameValuePair> signParams = new LinkedList<NameValuePair>();
 signParams.add(new BasicNameValuePair("appid", Constants.APP_ID_WX));
 signParams.add(new BasicNameValuePair("noncestr", MD5.getMessageDigest(String.valueOf(random.nextInt(10000)).getBytes())));
// signParams.add(new BasicNameValuePair("package", "prepay_id="+xml.get("prepay_id")));
 signParams.add(new BasicNameValuePair("package", "Sign=WXPay"));
 signParams.add(new BasicNameValuePair("partnerid", Constants.MCH_ID));
 signParams.add(new BasicNameValuePair("prepayid", xml.get("prepay_id")));
 signParams.add(new BasicNameValuePair("timestamp", String.valueOf(System.currentTimeMillis() / 1000)));
 xml.put("sign", genPackageSign(signParams));
 for (int i = 0; i < signParams.size(); i++) {
  xml.put(signParams.get(i).getName(),signParams.get(i).getValue());
 }
 return removeElements(xml);
 }
 
 private static Map<String, String> removeElements(Map<String, String> xml) {
 xml.remove("appid");
 xml.remove("mch_id");
 xml.remove("nonce_str");
 xml.remove("trade_type");
 //xml.remove("partnerid");
 xml.remove("prepay_id");
 xml.remove("result_code");
 xml.remove("return_code");
 xml.remove("return_msg");
 return xml;
 }
 
 private static String genProductArgs(BigDecimal amount,String out_trade_no) {
 StringBuffer xml = new StringBuffer();
 
 String nonceStr = genNonceStr();
 
 xml.append("</xml>");
 List<NameValuePair> packageParams = new LinkedList<NameValuePair>();
 packageParams.add(new BasicNameValuePair("appid", Constants.APP_ID_WX));
 packageParams.add(new BasicNameValuePair("body", "APP pay test"));
 packageParams.add(new BasicNameValuePair("mch_id", Constants.MCH_ID));
 packageParams.add(new BasicNameValuePair("nonce_str", nonceStr));
 packageParams.add(new BasicNameValuePair("notify_url", "填写服务器的支付回调路径"));
 packageParams.add(new BasicNameValuePair("out_trade_no",out_trade_no)); 
 packageParams.add(new BasicNameValuePair("spbill_create_ip","127.0.0.1"));
 packageParams.add(new BasicNameValuePair("total_fee", String.valueOf(amount.movePointRight(2))));
// packageParams.add(new BasicNameValuePair("total_fee", "1"));
 packageParams.add(new BasicNameValuePair("trade_type", "APP"));
 
 String sign = genPackageSign(packageParams);
 packageParams.add(new BasicNameValuePair("sign", sign));
 
 
 String xmlstring =toXml(packageParams);
 return xmlstring;
 }
 
 public static String genNonceStr() {
 Random random = new Random();
 return MD5.getMessageDigest(String.valueOf(random.nextInt(10000)).getBytes());
 }
 
 public static String genPackageSign(List<NameValuePair> params) {
 StringBuilder sb = new StringBuilder();
 
 for (int i = 0; i < params.size(); i++) {
  sb.append(params.get(i).getName());
  sb.append('=');
  sb.append(params.get(i).getValue());
  sb.append('&');
 }
 sb.append("key=");
 sb.append(Constants.API_KEY);
 
 
 String packageSign = MD5.getMessageDigest(sb.toString().getBytes()).toUpperCase();
 return packageSign;
 }
 
 public static String toXml(List<NameValuePair> params) {
 StringBuilder sb = new StringBuilder();
 sb.append("<xml>");
 for (int i = 0; i < params.size(); i++) {
  sb.append("<"+params.get(i).getName()+">");
 
 
  sb.append(params.get(i).getValue());
  sb.append("</"+params.get(i).getName()+">");
 }
 sb.append("</xml>");
 
 return sb.toString();
 }
 
}

public class Alipay {
 
 public static Map<String,String> prePay(BigDecimal payAbleAmount,String out_trade_no){
 //String orderInfo = getOrderInfo("订单付款", "订单付款",out_trade_no,"0.01");
 String orderInfo = getOrderInfo("订单付款", "订单付款",out_trade_no,String.valueOf(payAbleAmount));
 
 String sign = sign(orderInfo);
 
 try {
  /**
  * 仅需对sign 做URL编码
  */
  sign = URLEncoder.encode(sign, "UTF-8");
 } catch (UnsupportedEncodingException e) {
  e.printStackTrace();
 }
 
 /**
  * 完整的符合支付宝参数规范的订单信息
  */
 final String payInfo = orderInfo + "&sign=\"" + sign + "\"&" + getSignType();
 
 Map<String,String> map = new HashMap<String, String>();
 map.put("payInfo", payInfo);
 return map;
 }
 
 private static String getOrderInfo(String subject, String body,String out_trade_no,String price) {
 
 // 签约合作者身份ID
 String orderInfo = "partner=" + "\"" + Constants.PARTNER + "\"";
 
 // 签约卖家支付宝账号
 orderInfo += "&seller_id=" + "\"" + Constants.SELLER + "\"";
 
 // 商户网站唯一订单号
 orderInfo += "&out_trade_no=" + "\"" + out_trade_no + "\"";
 
 // 商品名称
 orderInfo += "&subject=" + "\"" + subject + "\"";
 
 // 商品详情
 orderInfo += "&body=" + "\"" + body + "\"";
 
 // 商品金额
 orderInfo += "&total_fee=" + "\"" + price + "\"";
 
 // 服务器异步通知页面路径
 orderInfo += "¬ify_url=" + "\"" + "填写服务器的支付回调路径" + "\"";
 
 
 // 服务接口名称， 固定值
 orderInfo += "&service=\"mobile.securitypay.pay\"";
 
 // 支付类型， 固定值
 orderInfo += "&payment_type=\"1\"";
 
 // 参数编码， 固定值
 orderInfo += "&_input_charset=\"utf-8\"";
 
 // 设置未付款交易的超时时间
 // 默认30分钟，一旦超时，该笔交易就会自动被关闭。
 // 取值范围：1m～15d。
 // m-分钟，h-小时，d-天，1c-当天（无论交易何时创建，都在0点关闭）。
 // 该参数数值不接受小数点，如1.5h，可转换为90m。
 orderInfo += "&it_b_pay=\"30m\"";
 
 // extern_token为经过快登授权获取到的alipay_open_id,带上此参数用户将使用授权的账户进行支付
 // orderInfo += "&extern_token=" + "\"" + extern_token + "\"";
 
 // 支付宝处理完请求后，当前页面跳转到商户指定页面的路径，可空
 orderInfo += "&return_url=\"m.alipay.com\"";
 
 // 调用银行卡支付，需配置此参数，参与签名， 固定值 （需要签约《无线银行卡快捷支付》才能使用）
 // orderInfo += "&paymethod=\"expressGateway\"";
 
 return orderInfo;
 }
 
 
 private static String sign(String content) {
 return SignUtils.sign(content, Constants.RSA_PRIVATE);
 }
 
 private static String getSignType() {
 return "sign_type=\"RSA\"";
 }
}

退款部分

支付宝

String strResponse = null;
AlipayTradeRefundResponse response = null;
try {
   AlipayClient alipayClient = new DefaultAlipayClient(url,Constants.APPID_ALIPAY,Constants.RSA_PRIVATE,"json","utf-8",Constants.RSA_PUBLIC);
   AlipayTradeRefundRequest request = new AlipayTradeRefundRequest();
      
   RefundInfo alidata = new RefundInfo();
   alidata.setOut_trade_no(out_trade_no);
   alidata.setRefund_amount(refund_amount);
      
   request.setBizContent(JSON.toJSONString(alidata));
      
    response = alipayClient.sdkExecute(request);
     if (response.isSuccess()) {
       strResponse="退款成功";
     } else {
     strResponse="退款失败";
     }
      
      return strResponse;
    } catch (Exception e) {
     strResponse="退款出错";
    }
return strResponse;

微信

public class WXRefund {
 private static final String url = "https://api.mch.weixin.qq.com/secapi/pay/refund";
 
 /**
 * 微信退款
 * @param out_trade_no 商户订单号
 * @param total_fee 总金额
 * @param refund_fee 退款金额
 * @return
 */
 public static String doRefund(String out_trade_no,int total_fee,int refund_fee) {
 
 InputStream instream = null;
 KeyStore keyStore = null;
 CloseableHttpResponse response = null;
 CloseableHttpClient httpclient = null;
 StringBuilder text = new StringBuilder();
 String key = Constants.MCH_ID;
 try {
  /**
  * 注意PKCS12证书 是从微信商户平台-》账户设置-》 API安全 中下载的
  */
  keyStore = KeyStore.getInstance("PKCS12");
  instream = WXRefund.class.getResourceAsStream("/apiclient_cert.p12");//P12文件
  
  
  /**
  * 此处要改
  */
  keyStore.load(instream, key.toCharArray());// 这里写密码..默认是MCHID
  
  /**
  * 此处要改
  */
  SSLContext sslcontext = SSLContexts.custom().loadKeyMaterial(keyStore, key.toCharArray())// 这里也是写密码的
  .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();
  
  //=======================证书配置完成========================
  
  
  HttpPost httpPost = new HttpPost(url);
  
  String xmlstring = getRefunArgs(out_trade_no,total_fee,refund_fee);
  
  
  
  httpPost.setEntity(new StringEntity(xmlstring));
  httpPost.setHeader("Accept", "application/json");
  httpPost.setHeader("Content-type", "application/json");
  
  response = httpclient.execute(httpPost);
  
  HttpEntity entity = response.getEntity();
  
  if (entity != null) {
  BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(entity.getContent()));
  
  String str;
  while ((str = bufferedReader.readLine()) != null) {
   text.append(str);
  }
  }
  EntityUtils.consume(entity);
 }catch(Exception e){
  
 }finally {
  if(instream != null){
  try {
   instream.close();
  } catch (IOException e) {
   e.printStackTrace();
  }
  }
  if(response != null){
  try {
   response.close();
  } catch (IOException e) {
   e.printStackTrace();
  }
  }
  
  if(httpclient != null){
  try {
   httpclient.close();
  } catch (IOException e) {
   e.printStackTrace();
  }
  }
 }
 Map<String,String> map = WXPay.decodeXml(text.toString());
 String return_msg = map.get("return_msg");
 if ("OK".equals(return_msg) && "SUCCESS".equals(map.get("return_code"))) {
  return "退款成功";
 }
 return return_msg;
 }
 
 //设置请求参数的值
 private static String getRefunArgs(String out_trade_no,int total_fee,int refund_fee) {
 String nonce_str = WXPay.genNonceStr();
 List<NameValuePair> packageParams = new LinkedList<NameValuePair>();
 packageParams.add(new BasicNameValuePair("appid", Constants.APP_ID_WX));
 packageParams.add(new BasicNameValuePair("mch_id", Constants.MCH_ID));
 packageParams.add(new BasicNameValuePair("nonce_str", nonce_str));
 packageParams.add(new BasicNameValuePair("op_user_id", Constants.MCH_ID));
 packageParams.add(new BasicNameValuePair("out_refund_no",out_trade_no));
 packageParams.add(new BasicNameValuePair("out_trade_no",out_trade_no));
 packageParams.add(new BasicNameValuePair("refund_fee", String.valueOf(refund_fee)));
 packageParams.add(new BasicNameValuePair("total_fee", String.valueOf(total_fee)));
 
 String sign = WXPay.genPackageSign(packageParams);
 packageParams.add(new BasicNameValuePair("sign", sign));
 
 
 return WXPay.toXml(packageParams);
 
 }
 
}

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小牛知识库。