微信支付H5調用支付詳解（java版）

最近項目需要微信支付，然後看了下微信公眾號支付，，雖然不難，但是細節還是需要注意的，用了大半天時間寫了個demo，並且完整的測試了一下支付流程，下面分享一下微信公眾號支付的經驗。

一、配置公眾號微信支付

需要我們配置微信公眾號支付地址和測試白名單。

比如：支付JS頁面的地址為http://www.xxx.com/shop/pay/

那此處配置www.xxx.com/shop/pay/

二、開發流程

借用微信公眾號支付api(地址http://pay.weixin.qq.com/wiki/doc/api/index.PHP?chapter=7_4)，我們需要開發的為紅色標記出的。如下：

三、向微信服務器端下訂單

調用統一下單接口，這樣就能獲取微信支付的prepay_id（http://pay.weixin.qq.com/wiki/doc/api/index.php?chapter=9_1）。

在調用該接口前有幾個字段是H5支付必須填寫的openid

3.1 獲取openid

可以通過網頁授權形式（http://mp.weixin.qq.com/wiki/17/c0f37d5704f0b64713d5d2c37b468d75.html）

在微信中發送如下鏈接
https://open.weixin.qq.com/connect/oauth2/authorize?appid=wx520c15f417810387&redirect_uri=要跳轉的下訂單的url&response_type=code&scope=snsapi_base&state=123#wechat_redirect

3.2 下訂單獲取prepay_id

代碼如下，實際上是通過post發送一個xml 文件，獲取微信服務器端發送過來的prepay_id。

 import java.io.ByteArrayInputStream; import javaioIOException; import javaioInputStream; import javaioUnsupportedEncodingException; import javautilDate; import javautilHashMap; import javautilIterator; import javautilMap; import javautilMapEntry; import javautilRandom; import javaxservlethttpHttpServletRequest; import javaxservlethttpHttpServletResponse; import orgapachecommonscodecdigestDigestUtils; import orgspringframeworkstereotypeController; import orgspringframeworkwebbindannotationRequestMapping; import orgxmlpullvXmlPullParser; import orgxmlpullvXmlPullParserException; import orgxmlpullvXmlPullParserFactory; import comfasterxmljacksondatabindJsonNode; import comgsonoauthOauth; import comgsonoauthPay; import comgsonutilHttpKit; import comsyutilDatetimeUtil; import comsyutilJsonUtil; @Controller @RequestMapping("/pay") public class WXPayController { @RequestMapping(value = "wxprepaydo") public void jspay(HttpServletRequest request, HttpServletResponse response, String callback) throws Exception { // 獲取openid String openId = SessionUtilgetAtt(request, "openId"); if (openId == null) { openId = getUserOpenId(request); } String appid = "wx16691fcb0523c1a4"; String paternerKey = "ININGFENG1234567fdfwfdfd1ss234567"; String out_trade_no = getTradeNo(); Map<String, String> paraMap = new HashMap<String, String>(); paraMapput("appid", appid); paraMapput("attach", "測試"); paraMapput("body", "測試購買支付"); paraMapput("mch_id", "10283271"); paraMapput("nonce_str", create_nonce_str()); paraMapput("openid", openId); paraMapput("out_trade_no", out_trade_no); paraMapput("spbill_create_ip", getAddrIp(request)); paraMapput("total_fee", "1"); paraMapput("trade_type", "JSAPI"); paraMapput("notify_url", "http://wwwxxxco/bank/page/wxnotify"); String sign = getSign(paraMap, paternerKey); paraMapput("sign", sign); // 統一下單https://apimchweixinqqcom/pay/unifiedorder String url = "https://apimchweixinqqcom/pay/unifiedorder"; String xml = ArrayToXml(paraMap); String xmlStr = HttpKitpost(url, xml); // 預付商品id String prepay_id = ""; if (xmlStrindexOf("SUCCESS") != -1) { Map<String, String> map = doXMLParse(xmlStr); prepay_id = (String) mapget("prepay_id"); } Map<String, String> payMap = new HashMap<String, String>(); payMapput("appId", appid); payMapput("timeStamp", create_timestamp()); payMapput("nonceStr", create_nonce_str()); payMapput("signType", "MD5"); payMapput("package", "prepay_id=" + prepay_id); String paySign = getSign(payMap, paternerKey); payMapput("pg", prepay_id); payMapput("paySign", paySign); WebUtilresponse(response, WebUtilpackJsonp(callback, JsonUtilwarpJsonNodeResponse(JsonUtilobjectToJsonNode(payMap))toString())); } /** * map轉成xml * * @param arr * @return */ public String ArrayToXml(Map<String, String> arr) { String xml = "<xml>"; Iterator<Entry<String, String>> iter = arrentrySet()iterator(); while (iterhasNext()) { Entry<String, String> entry = iternext(); String key = entrygetKey(); String val = entrygetValue(); xml += "<" + key + ">" + val + "</" + key + ">"; } xml += "</xml>"; return xml; } // 獲取openId private String getUserOpenId(HttpServletRequest request) throws Exception { String code = requestgetParameter("code"); if (code == null) { String openId = requestgetParameter("openId"); return openId; } Oauth o = new Oauth(); String token = ogetToken(code); JsonNode node = JsonUtilStringToJsonNode(token); String openId = nodeget("openid")asText(); return openId; } private String create_nonce_str() { String chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; String res = ""; for (int i = 0; i < 16; i++) { Random rd = new Random(); res += charscharAt(rdnextInt(charslength() - 1)); } return res; } private String getAddrIp(HttpServletRequest request){ return requestgetRemoteAddr(); } private String create_timestamp() { return LongtoString(SystemcurrentTimeMillis() / 1000); } private String getTradeNo(){ String timestamp = DatetimeUtilformatDate(new Date(), DatetimeUtilDATETIME_PATTERN); return "HZNO" + timestamp; } private String getSign(Map<String, String> params, String paternerKey ) throws UnsupportedEncodingException { String string1 = PaycreateSign(params, false); String stringSignTemp = string1 + "&key=" + paternerKey; String signValue = DigestUtilsmd5Hex(stringSignTemp)toUpperCase(); return signValue; } private Map<String, String> doXMLParse(String xml) throws XmlPullParserException, IOException { InputStream inputStream = new ByteArrayInputStream(xmlgetBytes()); Map<String, String> map = null; XmlPullParser pullParser = XmlPullParserFactorynewInstance() newPullParser(); pullParsersetInput(inputStream, "UTF-8"); // 為xml設置要解析的xml數據int eventType = pullParsergetEventType(); while (eventType != XmlPullParserEND_DOCUMENT) { switch (eventType) { case XmlPullParserSTART_DOCUMENT: map = new HashMap<String, String>(); break; case XmlPullParserSTART_TAG: String key = pullParsergetName(); if (keyequals("xml")) break; String value = pullParsernextText(); mapput(key, value); break; case XmlPullParserEND_TAG: break; } eventType = pullParsernext(); } return map; } }

四、H5支付

H5支付其實很簡單，只需要調用微信內嵌瀏覽器的js方法就行（http://pay.weixin.qq.com/wiki/doc/api/index.php?chapter=7_7）

 <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib prefix="spring" uri="http://wwwspringframeworkorg/tags" %> <% String path = requestgetContextPath(); String basePath = requestgetScheme() + "://" + requestgetServerName() + ":" + requestgetServerPort() + path + "/"; %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 01 Transitional//EN" "http://wwwworg/TR/html4/loosedtd"> <html> <head> <meta charset="utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=0, maximum-scale=0, user-scalable=0" /> <meta name="apple-mobile-web-app-capable" content="yes" /> <meta name="apple-mobile-web-app-status-bar-style" content="black" /> <meta name="format-detection" content="telephone=no" /> <title>測試支付</title> <link href="/css/csscss?v=0" rel="stylesheet" type="text/css"> </head> <body> <div> <div>微信js支付測試</div> <div> <ul> <li><span>測試支付信息</span></li> </ul> <p><a href="javascript:pay();">立即支付</a></p> </div> </div> <script type="text/javascript" src="/js/zeptominjs"></script> <script type="text/javascript" src="/js/commonjs"></script> <script type="text/javascript"> var appId = urlparameter("appId"); var timeStamp = urlparameter("timeStamp"); var nonceStr = urlparameter("nonceStr"); var pg = urlparameter("pg"); var signType = urlparameter("signType"); var paySign = urlparameter("paySign"); function onBridgeReady(){ WeixinJSBridgeinvoke( '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" : "prepay_id=" + pg, "signType" : signType, //微信簽名方式: "paySign" : paySign //微信簽名}, function(res){ if(reserr_msg == "get_brand_wcpay_request:ok" ) { alert("支付成功"); } // 使用以上方式判斷前端返回,微信團隊鄭重提示：reserr_msg將在用戶支付成功後返回ok，但並不保證它絕對可靠。 } ); } function pay(){ if (typeof WeixinJSBridge == "undefined"){ if( documentaddEventListener ){ documentaddEventListener('WeixinJSBridgeReady', onBridgeReady, false); }else if (documentattachEvent){ documentattachEvent('WeixinJSBridgeReady', onBridgeReady); documentattachEvent('onWeixinJSBridgeReady', onBridgeReady); } }else{ onBridgeReady(); } } </script> </body> </html>

效果如下

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武林網。