提示：僅微信支付功能模塊類，可供參考，可點贊

一、java后臺實現源碼

package cn.xydx.crowdfunding.controller;import cn.xydx.crowdfunding.util.HttpRequest;import cn.xydx.crowdfunding.util.WXPayUtil;import org.json.JSONObject;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.CrossOrigin;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.ResponseBody;import javax.servlet.http.HttpServletRequest;import java.text.DateFormat;import java.text.SimpleDateFormat;import java.util.Date;import java.util.HashMap;import java.util.Map;import java.util.Random;import static cn.xydx.crowdfunding.util.WXPayConfig.appid;import static cn.xydx.crowdfunding.util.WXPayConfig.appsecret;import static cn.xydx.crowdfunding.util.WXPayConfig.mch_id;import static cn.xydx.crowdfunding.util.WXPayConfig.key;@Controller@RequestMapping(value = 'WeixinService')@CrossOriginpublic class WeixinPayController { /** * @param request * @param code * @return Map * @Description 微信瀏覽器內微信支付/公眾號支付(JSAPI) */ @RequestMapping(value = 'orders', method = RequestMethod.GET) @ResponseBody public Map orders(HttpServletRequest request, String code) { try { //頁面獲取openId接口 String getopenid_url = 'https://api.weixin.qq.com/sns/oauth2/access_token'; String param = 'appid=' + appid + '&secret=' + appsecret + '&code=' + code + '&grant_type=authorization_code'; // 向微信服務器發送get請求獲取openIdStr String openIdStr = HttpRequest.sendGet(getopenid_url, param);// JSONObject json = JSONObject.parseObject(openIdStr);//轉成Json格式 JSONObject json = new JSONObject(openIdStr); String openId = json.getString('openid');//獲取openId //拼接統一下單地址參數 Map<String, String> paraMap = new HashMap<String, String>(); //獲取請求ip地址 String ip = request.getHeader('x-forwarded-for'); if (ip == null || ip.length() == 0 || 'unknown'.equalsIgnoreCase(ip)) { ip = request.getHeader('Proxy-Client-IP'); } if (ip == null || ip.length() == 0 || 'unknown'.equalsIgnoreCase(ip)) { ip = request.getHeader('WL-Proxy-Client-IP'); } if (ip == null || ip.length() == 0 || 'unknown'.equalsIgnoreCase(ip)) { ip = request.getRemoteAddr(); } if (ip.indexOf(',') != -1) { String[] ips = ip.split(','); ip = ips[0].trim(); } paraMap.put('appid', appid); paraMap.put('mch_id', mch_id); paraMap.put('nonce_str', WXPayUtil.generateNonceStr()); paraMap.put('body', 'CrowdFund'); paraMap.put('out_trade_no', getOrderSn());//訂單號 paraMap.put('total_fee', '1'); paraMap.put('spbill_create_ip', ip); paraMap.put('notify_url', 'http://******/index.html');// 此路徑是微信服務器調用支付結果通知路徑隨意寫 paraMap.put('trade_type', 'JSAPI'); paraMap.put('openid', openId); String sign = WXPayUtil.generateSignature(paraMap, key); paraMap.put('sign', sign); String xml = WXPayUtil.mapToXml(paraMap);//將所有參數(map)轉xml格式// System.out.println('xml='+xml); // 統一下單 String unifiedorder_url = 'https://api.mch.weixin.qq.com/pay/unifiedorder'; String xmlStr = HttpRequest.sendPost(unifiedorder_url, xml);//發送post請求'統一下單接口'返回預支付id:prepay_id System.out.println(xmlStr); //以下內容是返回前端頁面的json數據 String prepay_id = '';//預支付id if (xmlStr.indexOf('SUCCESS') != -1) { Map<String, String> map = WXPayUtil.xmlToMap(xmlStr); prepay_id = (String) map.get('prepay_id'); } Map<String, String> payMap = new HashMap<String, String>(); payMap.put('appId', appid); payMap.put('timeStamp', WXPayUtil.getCurrentTimestamp() + ''); payMap.put('nonceStr', WXPayUtil.generateNonceStr()); payMap.put('signType', 'MD5'); payMap.put('package', 'prepay_id=' + prepay_id); String paySign = WXPayUtil.generateSignature(payMap, key); payMap.put('paySign', paySign);// System.out.println('code='+code); System.out.println('openIdStr='+openIdStr); return payMap; } catch (Exception e) { e.printStackTrace(); } return null; } public String getOrderSn() { //創建不同的日期格式 DateFormat df = new SimpleDateFormat('yyyyMMddHHmmss'); Random rm = new Random(); // 獲得隨機數 double pross = (1 + rm.nextDouble()) * Math.pow(10, 6); // 將獲得的獲得隨機數轉化為字符串 String fixLenthString = String.valueOf(pross); String dateNum = df.format(new Date()) + 'WX' + fixLenthString.substring(1,7); return dateNum; } @RequestMapping(value = 'orderquery', method = RequestMethod.GET) @ResponseBody public String orderquery() { try { Map<String, String> reqMap = new HashMap<String, String>(); reqMap.put('appid', appid); reqMap.put('mch_id', mch_id); reqMap.put('nonce_str', WXPayUtil.generateNonceStr()); reqMap.put('out_trade_no', getOrderSn()); //商戶系統內部的訂單號, String sign = WXPayUtil.generateSignature(reqMap, key); reqMap.put('sign', sign); String reqXmlStr = WXPayUtil.mapToXml(reqMap);//將所有參數(map)轉xml格式// System.out.println('xml='+reqXmlStr); // 查詢訂單 https://api.mch.weixin.qq.com/pay/orderquery String orderquery = 'https://api.mch.weixin.qq.com/pay/orderquery'; String xmlStr = HttpRequest.sendPost(orderquery, reqXmlStr); return xmlStr; } catch (Exception e) { e.printStackTrace(); } return null; }}

HttpRequest 類

package cn.xydx.crowdfunding.util;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.URL;import java.net.URLConnection;import java.util.List;import java.util.Map;public class HttpUtil { /** * 向指定URL發送GET方法的請求 * * @param url 發送請求的URL * //@param param 請求參數，請求參數應該是 name1=value1&name2=value2 的形式。 * @return URL 所代表遠程資源的響應結果 */ public static String sendGet(String url) { String result = ''; BufferedReader in = null; try { String urlNameString = url ; URL realUrl = new URL(urlNameString); // 打開和URL之間的連接 URLConnection connection = realUrl.openConnection(); // 設置通用的請求屬性 connection.setRequestProperty('accept', '*/*'); connection.setRequestProperty('connection', 'Keep-Alive'); connection.setRequestProperty('user-agent', 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)'); // 建立實際的連接 connection.connect(); // 獲取所有響應頭字段 Map<String, List<String>> map = connection.getHeaderFields(); // 遍歷所有的響應頭字段 for (String key : map.keySet()) { System.out.println(key + '--->' + map.get(key)); } // 定義 BufferedReader輸入流來讀取URL的響應 in = new BufferedReader(new InputStreamReader( connection.getInputStream())); String line; while ((line = in.readLine()) != null) { result += line; } } catch (Exception e) { System.out.println('發送GET請求出現異常！' + e); e.printStackTrace(); } // 使用finally塊來關閉輸入流 finally { try { if (in != null) { in.close(); } } catch (Exception e2) { e2.printStackTrace(); } } return result; } /** * 向指定 URL 發送POST方法的請求 * * @param url 發送請求的 URL * @param param 請求參數，請求參數應該是 name1=value1&name2=value2 的形式。 * @return 所代表遠程資源的響應結果 */ public static String sendPost(String url, String param) { PrintWriter out = null; BufferedReader in = null; String result = ''; try { URL realUrl = new URL(url); // 打開和URL之間的連接 URLConnection conn = realUrl.openConnection(); // 設置通用的請求屬性 conn.setRequestProperty('accept', '*/*'); conn.setRequestProperty('connection', 'Keep-Alive'); conn.setRequestProperty('user-agent', 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)'); // 發送POST請求必須設置如下兩行 conn.setDoOutput(true); conn.setDoInput(true); // 獲取URLConnection對象對應的輸出流 out = new PrintWriter(conn.getOutputStream()); // 發送請求參數 out.print(param); // flush輸出流的緩沖 out.flush(); // 定義BufferedReader輸入流來讀取URL的響應 in = new BufferedReader( new InputStreamReader(conn.getInputStream())); String line; while ((line = in.readLine()) != null) { result += line; } } catch (Exception e) { System.out.println('發送 POST 請求出現異常！' + e); e.printStackTrace(); } //使用finally塊來關閉輸出流、輸入流 finally { try { if (out != null) { out.close(); } if (in != null) { in.close(); } } catch (IOException ex) { ex.printStackTrace(); } } return result; }}

WXPayUtil 類

package cn.xydx.crowdfunding.util;import cn.xydx.crowdfunding.util.WXPayConstants.SignType;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.w3c.dom.Node;import org.w3c.dom.NodeList;import javax.crypto.Mac;import javax.crypto.spec.SecretKeySpec;import javax.xml.parsers.DocumentBuilder;import javax.xml.transform.OutputKeys;import javax.xml.transform.Transformer;import javax.xml.transform.TransformerFactory;import javax.xml.transform.dom.DOMSource;import javax.xml.transform.stream.StreamResult;import java.io.ByteArrayInputStream;import java.io.InputStream;import java.io.StringWriter;import java.security.MessageDigest;import java.security.SecureRandom;import java.util.*;public class WXPayUtil { private static final String SYMBOLS = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; private static final Random RANDOM = new SecureRandom(); /** * XML格式字符串轉換為Map * * @param strXML XML字符串 * @return XML數據轉換后的Map * @throws Exception */ public static Map<String, String> xmlToMap(String strXML) throws Exception { try { Map<String, String> data = new HashMap<String, String>(); DocumentBuilder documentBuilder = WXPayXmlUtil.newDocumentBuilder(); InputStream stream = new ByteArrayInputStream(strXML.getBytes('UTF-8')); org.w3c.dom.Document doc = documentBuilder.parse(stream); doc.getDocumentElement().normalize(); NodeList nodeList = doc.getDocumentElement().getChildNodes(); for (int idx = 0; idx < nodeList.getLength(); ++idx) { Node node = nodeList.item(idx); if (node.getNodeType() == Node.ELEMENT_NODE) { org.w3c.dom.Element element = (org.w3c.dom.Element) node; data.put(element.getNodeName(), element.getTextContent()); } } try { stream.close(); } catch (Exception ex) { // do nothing } return data; } catch (Exception ex) { WXPayUtil.getLogger().warn('Invalid XML, can not convert to map. Error message: {}. XML content: {}', ex.getMessage(), strXML); throw ex; } } /** * 將Map轉換為XML格式的字符串 * * @param data Map類型數據 * @return XML格式的字符串 * @throws Exception */ public static String mapToXml(Map<String, String> data) throws Exception { org.w3c.dom.Document document = WXPayXmlUtil.newDocument(); org.w3c.dom.Element root = document.createElement('xml'); document.appendChild(root); for (String key: data.keySet()) { String value = data.get(key); if (value == null) { value = ''; } value = value.trim(); org.w3c.dom.Element filed = document.createElement(key); filed.appendChild(document.createTextNode(value)); root.appendChild(filed); } TransformerFactory tf = TransformerFactory.newInstance(); Transformer transformer = tf.newTransformer(); DOMSource source = new DOMSource(document); transformer.setOutputProperty(OutputKeys.ENCODING, 'UTF-8'); transformer.setOutputProperty(OutputKeys.INDENT, 'yes'); StringWriter writer = new StringWriter(); StreamResult result = new StreamResult(writer); transformer.transform(source, result); String output = writer.getBuffer().toString(); //.replaceAll('n|r', ''); try { writer.close(); } catch (Exception ex) { } return output; } /** * 生成帶有 sign 的 XML 格式字符串 * * @param data Map類型數據 * @param key API密鑰 * @return 含有sign字段的XML */ public static String generateSignedXml(final Map<String, String> data, String key) throws Exception { return generateSignedXml(data, key, SignType.MD5); } /** * 生成帶有 sign 的 XML 格式字符串 * * @param data Map類型數據 * @param key API密鑰 * @param signType 簽名類型 * @return 含有sign字段的XML */ public static String generateSignedXml(final Map<String, String> data, String key, SignType signType) throws Exception { String sign = generateSignature(data, key, signType); data.put(WXPayConstants.FIELD_SIGN, sign); return mapToXml(data); } /** * 判斷簽名是否正確 * * @param xmlStr XML格式數據 * @param key API密鑰 * @return 簽名是否正確 * @throws Exception */ public static boolean isSignatureValid(String xmlStr, String key) throws Exception { Map<String, String> data = xmlToMap(xmlStr); if (!data.containsKey(WXPayConstants.FIELD_SIGN) ) { return false; } String sign = data.get(WXPayConstants.FIELD_SIGN); return generateSignature(data, key).equals(sign); } /** * 判斷簽名是否正確，必須包含sign字段，否則返回false。使用MD5簽名。 * * @param data Map類型數據 * @param key API密鑰 * @return 簽名是否正確 * @throws Exception */ public static boolean isSignatureValid(Map<String, String> data, String key) throws Exception { return isSignatureValid(data, key, SignType.MD5); } /** * 判斷簽名是否正確，必須包含sign字段，否則返回false。 * * @param data Map類型數據 * @param key API密鑰 * @param signType 簽名方式 * @return 簽名是否正確 * @throws Exception */ public static boolean isSignatureValid(Map<String, String> data, String key, SignType signType) throws Exception { if (!data.containsKey(WXPayConstants.FIELD_SIGN) ) { return false; } String sign = data.get(WXPayConstants.FIELD_SIGN); return generateSignature(data, key, signType).equals(sign); } /** * 生成簽名 * * @param data 待簽名數據 * @param key API密鑰 * @return 簽名 */ public static String generateSignature(final Map<String, String> data, String key) throws Exception { return generateSignature(data, key, SignType.MD5); } /** * 生成簽名. 注意，若含有sign_type字段，必須和signType參數保持一致。 * * @param data 待簽名數據 * @param key API密鑰 * @param signType 簽名方式 * @return 簽名 */ public static String generateSignature(final Map<String, String> data, String key, SignType signType) throws Exception { Set<String> keySet = data.keySet(); String[] keyArray = keySet.toArray(new String[keySet.size()]); Arrays.sort(keyArray); StringBuilder sb = new StringBuilder(); for (String k : keyArray) { if (k.equals(WXPayConstants.FIELD_SIGN)) { continue; } if (data.get(k).trim().length() > 0) // 參數值為空，則不參與簽名 sb.append(k).append('=').append(data.get(k).trim()).append('&'); } sb.append('key=').append(key); if (SignType.MD5.equals(signType)) { return MD5(sb.toString()).toUpperCase(); } else if (SignType.HMACSHA256.equals(signType)) { return HMACSHA256(sb.toString(), key); } else { throw new Exception(String.format('Invalid sign_type: %s', signType)); } } /** * 獲取隨機字符串 Nonce Str * * @return String 隨機字符串 */ public static String generateNonceStr() { char[] nonceChars = new char[32]; for (int index = 0; index < nonceChars.length; ++index) { nonceChars[index] = SYMBOLS.charAt(RANDOM.nextInt(SYMBOLS.length())); } return new String(nonceChars); } /** * 生成 MD5 * * @param data 待處理數據 * @return MD5結果 */ public static String MD5(String data) throws Exception { java.security.MessageDigest md = MessageDigest.getInstance('MD5'); byte[] array = md.digest(data.getBytes('UTF-8')); StringBuilder sb = new StringBuilder(); for (byte item : array) { sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3)); } return sb.toString().toUpperCase(); } /** * 生成 HMACSHA256 * @param data 待處理數據 * @param key 密鑰 * @return 加密結果 * @throws Exception */ public static String HMACSHA256(String data, String key) throws Exception { Mac sha256_HMAC = Mac.getInstance('HmacSHA256'); SecretKeySpec secret_key = new SecretKeySpec(key.getBytes('UTF-8'), 'HmacSHA256'); sha256_HMAC.init(secret_key); byte[] array = sha256_HMAC.doFinal(data.getBytes('UTF-8')); StringBuilder sb = new StringBuilder(); for (byte item : array) { sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3)); } return sb.toString().toUpperCase(); } /** * 日志 * @return */ public static Logger getLogger() { Logger logger = LoggerFactory.getLogger('wxpay java sdk'); return logger; } /** * 獲取當前時間戳，單位秒 * @return */ public static long getCurrentTimestamp() { return System.currentTimeMillis()/1000; } /** * 獲取當前時間戳，單位毫秒 * @return */ public static long getCurrentTimestampMs() { return System.currentTimeMillis(); }}

二、前端支付關鍵模塊

<li><a rel='external nofollow' >立即訂購</a></li>

需要上面的連接獲取code

//獲取codefunction getQueryString(name) { var reg = new RegExp('(^|&)' + name + '=([^&]*)(&|$)', 'i'); var r = window.location.search.substr(1).match(reg); if (r != null) return unescape(r[2]); return null;}

var code = getQueryString('code'); if (code) { var url = 'http://******/WeixinService/orders?code=' + code + ''; $.get(url, function (data) { var appid = data.appId; var timeStamp = data.timeStamp; var nonceStr = data.nonceStr; var package = data.package; var signType = data.signType; var paySign = data.paySign; if (typeof WeixinJSBridge == 'undefined') { if (document.addEventListener) { document.addEventListener(’WeixinJSBridgeReady’, onBridgeReady, false); } else if (document.attachEvent) { document.attachEvent(’WeixinJSBridgeReady’, onBridgeReady); document.attachEvent(’onWeixinJSBridgeReady’, onBridgeReady); } } else { // onBridgeReady(); WeixinJSBridge.invoke(’getBrandWCPayRequest’, { 'appId': appid, //公眾號名稱,由商戶傳入 'timeStamp': timeStamp, //時間戳,自1970年以來的秒數 'nonceStr': nonceStr, //隨機串 'package': package, 'signType': signType, //微信簽名方式： 'paySign': paySign //微信簽名 }, function (res) { if (res.err_msg == 'get_brand_wcpay_request:ok') { //console.log(’支付成功’); // 支付成功后比如新增數據 $.post('http://******/saveUser', { userName: $(’#inputName’).val(), userIdentity: $(’#inputIdentity’).val(), companyName: $(’#inputCompany’).val(), userPhone: $(’#inputPhone’).val() }, function (data, status) { alert('數據: n你好！' + $(’#inputName’).val() + 'n狀態: ' + status); }, 'json' ); //支付成功后跳轉的頁面 alert('支付成功!將返回首頁!請分享******!'); window.history.go(-1); } else if (res.err_msg == 'get_brand_wcpay_request:cancel') { //console.log(’支付取消’); alert('支付取消!保證數據安全 重新參加訂購!'); //WeixinJSBridge.call(’closeWindow’); window.history.go(-1); } else if (res.err_msg == 'get_brand_wcpay_request:fail') { //console.log(’支付失敗’); alert('支付失敗!重復支付，建議稍后參加訂購'); WeixinJSBridge.call(’closeWindow’); } //使用以上方式判斷前端返回,微信團隊鄭重提示：res.err_msg將在用戶支付成功后返回ok,但并不保證它絕對可靠。 }); } }, 'json') } else { alert('服務器異常') }

提示：前端關鍵通過http連接生成code。后端最后獲取reqXmlStr若不成功，可重置商戶秘鑰key。

總結

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