工作需要，寫了服務器端的支付和退款功能，包含微信和支付寶，網上也有很多demo可以借鑒，我把我的代碼放出來，寫的比較簡單，有問題的歡迎指正，大家一起學習。
微信支付需要調用微信的統一下單接口，而支付寶不用。
我寫的時候微信和支付寶都單獨寫了一個工具類，來調用支付，給前端返回需要的數據。
ps：支付是可以不需要服務器端的，不過為了安全一點點，所以前端需要調起支付的字段都直接從服務器端返回，前端拿到字段直接調起支付就可以了。
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是支付寶支付，20是微信支付，map里存放前端需要的字段，直接返回給手機端
其中out_trade_no這個是商戶自己生成的唯一訂單號
public class WXPay { private static String url = String.format("https://api.mch.weixin.qq.com/pay/unifiedorder"); //統一下單 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", "填寫服務器的支付回調路徑")); 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("訂單付款", "訂單付款",out_trade_no,"0.01"); String orderInfo = getOrderInfo("訂單付款", "訂單付款",out_trade_no,String.valueOf(payAbleAmount)); String sign = sign(orderInfo); try { /** * 僅需對sign 做URL編碼 */ sign = URLEncoder.encode(sign, "UTF-8"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } /** * 完整的符合支付寶參數規范的訂單信息 */ 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) { // 簽約合作者身份ID String orderInfo = "partner=" + "/"" + Constants.PARTNER + "/""; // 簽約賣家支付寶賬號 orderInfo += "&seller_id=" + "/"" + Constants.SELLER + "/""; // 商戶網站唯一訂單號 orderInfo += "&out_trade_no=" + "/"" + out_trade_no + "/""; // 商品名稱 orderInfo += "&subject=" + "/"" + subject + "/""; // 商品詳情 orderInfo += "&body=" + "/"" + body + "/""; // 商品金額 orderInfo += "&total_fee=" + "/"" + price + "/""; // 服務器異步通知頁面路徑 orderInfo += "¬ify_url=" + "/"" + "填寫服務器的支付回調路徑" + "/""; // 服務接口名稱， 固定值 orderInfo += "&service=/"mobile.securitypay.pay/""; // 支付類型， 固定值 orderInfo += "&payment_type=/"1/""; // 參數編碼， 固定值 orderInfo += "&_input_charset=/"utf-8/""; // 設置未付款交易的超時時間 // 默認30分鐘，一旦超時，該筆交易就會自動被關閉。 // 取值范圍：1m～15d。 // m-分鐘，h-小時，d-天，1c-當天（無論交易何時創建，都在0點關閉）。 // 該參數數值不接受小數點，如1.5h，可轉換為90m。 orderInfo += "&it_b_pay=/"30m/""; // extern_token為經過快登授權獲取到的alipay_open_id,帶上此參數用戶將使用授權的賬戶進行支付 // orderInfo += "&extern_token=" + "/"" + extern_token + "/""; // 支付寶處理完請求后，當前頁面跳轉到商戶指定頁面的路徑，可空 orderInfo += "&return_url=/"m.alipay.com/""; // 調用銀行卡支付，需配置此參數，參與簽名， 固定值 （需要簽約《無線銀行卡快捷支付》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
支付寶
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="退款失敗"; } return strResponse; } catch (Exception e) { strResponse="退款出錯"; }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 商戶訂單號 * @param total_fee 總金額 * @param refund_fee 退款金額 * @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證書 是從微信商戶平臺-》賬戶設置-》 API安全 中下載的 */ keyStore = KeyStore.getInstance("PKCS12"); instream = WXRefund.class.getResourceAsStream("/apiclient_cert.p12");//P12文件 /** * 此處要改 */ keyStore.load(instream, key.toCharArray());// 這里寫密碼..默認是MCHID /** * 此處要改 */ SSLContext sslcontext = SSLContexts.custom().loadKeyMaterial(keyStore, key.toCharArray())// 這里也是寫密碼的 .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(); //=======================證書配置完成======================== 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; } //設置請求參數的值 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內容，希望對大家的學習有所幫助，也希望大家多多支持VeVb武林網。
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