最近做完了一个项目，正好没事做，产品经理就给我安排了一个任务。
做一个像收钱吧这样可以统一扫码收钱的功能。
一开始并不知道是怎么实现的，咨询了好几个朋友，才知道大概的业务流程：先是开一个网页用来判断支付平台，是微信还是支付宝，判断过后就好办了，直接照搬微信支付和支付宝的官方文档。不过微信的文档感觉有点坑，得多花点心思。
现在讲讲怎么实现微信支付网页支付，也就是公众号支付：
1.判断支付平台，在判断是微信平台时，必须使用window.location打开网页，使用其他方法在IOS版微信无法打开网页，至少现在的新版微信无法打开。对应的连接是请求获取code的链接。第2步会讲到。
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<html><head> <title>判断客户平台</title> <basefont face="微软雅黑" size="2" /> <meta http-equiv="Content-Type" content="text/html;charset=utf-8" /> <meta name="exporter-version" content="Evernote Windows/303244 (zh-CN, DDL); Windows/6.1.7601 Service Pack 1 (Win64);"/><script type="text/javascript" src="jquery-3.1.1.min.js"></script> <style> body, td { font-family: 微软雅黑; font-size: 10pt; } </style></head><body><script type="text/javascript"> window.onload = function(){ if(isWeiXin()){ window.location='http://www.xxoo.com/InterfaceAPI/code'; } else if(isZFB()){ alert('支付宝即将开放....');//var p = document.getElementsByTagName('p'); //p[0].innerHTML = window.navigator.userAgent; }else{ alert('请使用微信或者支付宝App扫码'); }} function isWeiXin(){ var ua = window.navigator.userAgent.toLowerCase(); if(ua.match(/MicroMessenger/i) == 'micromessenger'){ return true; }else{ return false; }} function isZFB(){ var ua = window.navigator.userAgent.toLowerCase(); if(ua.match(/AlipayClient/i) =='alipayclient'){ return true; }else{ return false; }}</script> </body></html> |
2.这里是获取code，回调地址必须使用URLEncoder的utf-8编码，这里最终只获取openid，需要获取UserInfo其他信息的自行测试，只需要修改一下 scope 的参数，
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@RequestMapping({ "code" }) public void getCode(HttpServletRequest request, HttpServletResponse response) { try { //回调地址 String redirect_uri = URLEncoder.encode( "http://www.xxoo.com/InterfaceAPI/openid?codeID=7837283", "utf-8"); String url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=" + WechatConfig.APP_ID + "&redirect_uri=" + redirect_uri + "&response_type=code&scope=snsapi_base&state=STATE#wechat_redirect"; response.sendRedirect(url); } catch (Exception e) { e.printStackTrace(); } } |
3.里面有一个codeid的参数，不要在意这个，是用来测试用的。这里只需要openid,下面是使用get方法获取json返回结果，获取到openid后，重定向到支付页面。
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@RequestMapping({ "openid" }) public void getOpenid(String codeID, String code, HttpServletResponse response) { try { String requestUrl = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=" + WechatConfig.APP_ID + "&secret=" + WechatConfig.APP_SECRET + "&code=" + code + "&grant_type=authorization_code"; if (code != null) { String json = WebUtils.get(requestUrl, null); WechatResult result = new Gson().fromJson(json, WechatResult.class); OPEN_ID = result.getOpenid(); System.out.println("====OPEN_ID====" + OPEN_ID); response.sendRedirect("http://www.xxoo.com/InterfaceAPI/pay.html"); } } catch (Exception e) { e.printStackTrace(); } } |
4.在前端支付页面输入要支付的金额，提交到后台
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$.ajax({ type: "POST", dataType: "html", url: "http://www.xxoo.com/InterfaceAPI/weixinPay", data: "value="+self.input.value, timeout:10000, cache: true, async: true, error: function(data){ //alert(data+"---value-->"+self.input.value); }, },}); |
5.后端获取金额然后在后端统一下单，公众号支付有两个地方不一样，一是支付类型要改为 JSAPI，二是需要获取openid
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@RequestMapping({ "weixinPay" })public void weixinPay(HttpServletRequest request, HttpServletResponse response) { String value = request.getParameter("value"); WechatTradeTest wechat = new WechatTradeTest(); String json = wechat.testunifiedOrder(Integer.valueOf(value), OPEN_ID);//这里返回json到前端 write(json, response);} |
6.统一下单成功后返回的结果例子：
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<xml> <return_code><![CDATA[SUCCESS]]></return_code> <return_msg><![CDATA[OK]]></return_msg> <appid><![CDATA[wx2421b1c4370ec43b]]></appid> <mch_id><![CDATA[10000100]]></mch_id> <nonce_str><![CDATA[IITRi8Iabbblz1Jc]]></nonce_str> <openid><![CDATA[oUpF8uMuAJO_M2pxb1Q9zNjWeS6o]]></openid> <sign><![CDATA[7921E432F65EB8ED0CE9755F0E86D72F]]></sign> <result_code><![CDATA[SUCCESS]]></result_code> <prepay_id><![CDATA[wx201411101639507cbf6ffd8b0779950874]]></prepay_id> <trade_type><![CDATA[JSAPI]]></trade_type></xml> |
7.返回的参数需要重新签名并返回到前端，签名方法与统一下单时的签名是一样的！签名时必须要带上微信商户返回是以Json格式返回到前端。
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public String testunifiedOrder(int fee,String openid) { WechatUnifiedOrder request = new WechatUnifiedOrder(); request.setBody("测试商品"); request.setDetail("一个好商品"); request.setGoods_tag("测试"); request.setOut_trade_no(System.currentTimeMillis() + ""); request.setFee_type("CNY"); request.setTotal_fee(1); request.setSpbill_create_ip("192.168.88.26"); request.setTime_start(System.currentTimeMillis() + ""); request.setOpenid(openid); //下单成功后返回 WechatUnifiedOrder.Response response = WechatConfig.getInstance() .unifiedOrder(request); response.setTime_start(request.getTime_start()); WeichatData data = new WeichatData(); data.setAppId(response.getAppid()); data.setTimeStamp(request.getTime_start()); data.setNonceStr(response.getNonce_str()); data.setPrepay_id(response.getPrepay_id()); data.setSignType("MD5"); TreeMap<String, String> requestMap = new TreeMap<String, String>(); requestMap.put("appId", response.getAppid()); requestMap.put("timeStamp", response.getTime_start()); requestMap.put("nonceStr", response.getNonce_str()); requestMap.put("package", "prepay_id="+response.getPrepay_id()); requestMap.put("signType","MD5"); data.setPaySign(sign(requestMap).toUpperCase()); return new Gson().toJson(data); } |
8.前端需要解析json，获取对应的值，唤醒微信支付
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success: function(data){ if(data!=null){ var obj=eval("("+data+")"); appId = obj["appId"]; //timeStamp = new Date().getTime(); timeStamp = obj["timeStamp"]; nonceStr = obj["nonceStr"]; package = obj["prepay_id"]; paySign = obj["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(); } }else{ alert("支付失败"); } }, |
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//微信回调 function onBridgeReady(){WeixinJSBridge.invoke( 'getBrandWCPayRequest', { "appId" :appId, "timeStamp":timeStamp, "nonceStr" :nonceStr, "package" :"prepay_id="+package, "signType" :"MD5", "paySign" : paySign }, function(res){ if(res.err_msg == "get_brand_wcpay_request：ok" ) { }else { } }); |
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服务器之家。
原文链接：http://www.cnblogs.com/tefcricul/p/6344333.html
