最近项目需要微信支付，然后看了下微信公众号支付，，虽然不难，但是细节还是需要注意的，用了大半天时间写了个demo，并且完整的测试了一下支付流程，下面分享一下微信公众号支付的经验。
一、配置公众号微信支付
需要我们配置微信公众号支付地址和测试白名单。
比如：支付JS页面的地址为 http://www.xxx.com/shop/pay/
那此处配置www.xxx.com/shop/pay/
二、开发流程
借用微信公众号支付api(地址 http://pay.weixin.qq.com/wiki/doc/api/index.PHP?chapter=7_4)，我们需要开发的为红色标记出的。如下：
三、向微信服务器端下订单
调用统一下单接口，这样就能获取微信支付的prepay_id（http://pay.weixin.qq.com/wiki/doc/api/index.php?chapter=9_1）。
在调用该接口前有几个字段是H5支付必须填写的openid
3.1 获取openid
可以通过网页授权形式（http://mp.weixin.qq.com/wiki/17/c0f37d5704f0b64713d5d2c37b468d75.html）
在微信中发送如下链接
https://open.weixin.qq.com/connect/oauth2/authorize?appid=wx520c15f417810387&redirect_uri=要跳转的下订单的url&response_type=code&scope=snsapi_base&state=123#wechat_redirect
3.2 下订单获取prepay_id
代码如下，实际上是通过post发送一个xml 文件，获取微信服务器端发送过来的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 { // 获取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", "测试"); paraMapput("body", "测试购买支付"); 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); // 统一下单 https://apimchweixinqqcom/pay/unifiedorder String url = "https://apimchweixinqqcom/pay/unifiedorder"; String xml = ArrayToXml(paraMap); String xmlStr = HttpKitpost(url, xml); // 预付商品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转成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; } // 获取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"); // 为xml设置要解析的xml数据 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支付其实很简单，只需要调用微信内嵌浏览器的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>测试支付</title> <link href="/css/csscss?v=0" rel="stylesheet" type="text/css"> </head> <body> <div> <div>微信js支付测试</div> <div> <ul> <li><span>测试支付信息</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, //公众号名称，由商户传入 "timeStamp": timeStamp, //时间戳，自1970年以来的秒数 "nonceStr" : nonceStr, //随机串 "package" : "prepay_id=" + pg, "signType" : signType, //微信签名方式: "paySign" : paySign //微信签名 }, function(res){ if(reserr_msg == "get_brand_wcpay_request:ok" ) { alert("支付成功"); } // 使用以上方式判断前端返回,微信团队郑重提示：reserr_msg将在用户支付成功后返回 ok，但并不保证它绝对可靠。 } ); } 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
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