微信公众平台支付开发详解

public jsonresult createrecharegorder(decimal money)
 {
 if (money < (decimal)0.01) return json(new paymentresult("充值金额非法！"));
 var user = _workcontext.currentuser;
 var order = _paymentservice.createrechargeorder(user.id, money);
 return json(new paymentresult(true) {orderid = order.ordernumber});
 }

[loginvalid]
 public actionresult h5pay(string ordernumber)
 {
 var user = _workcontext.currentuser;
 var order = _paymentservice.getorderbyordernumber(ordernumber);
 //判断订单是否存在
 //订单是否已经支付了
 var openid = user.openid;
 var jsapipay = new jsapipaymvc(this.controllercontext.httpcontext);
 jsapipay.openid = openid;
 jsapipay.total_fee = (int)order.amount * 100;
 wxpaydata unifiedorderresult = jsapipay.getunifiedorderresult();
 viewbag.wxjsapiparam = jsapipay.getjsapiparameters();//获取h5调起js api参数 
 viewbag.unifiedorder = unifiedorderresult.toprintstr();
 viewbag.ordernumber = order.ordernumber;
 return view();
 }

using system;
using system.collections.generic;
using system.web;
using system.web.ui;
using system.web.ui.webcontrols;
using system.runtime.serialization;
using system.io;
using system.text;
using system.net;
using system.web.security;
using litjson;
namespace wxpayapi
{
 public class jsapipaymvc
 {
 /// <summary>
 /// 保存页面对象，因为要在类的方法中使用page的request对象
 /// </summary>
 public httpcontextbase context { get; set; }
 /// <summary>
 /// openid用于调用统一下单接口
 /// </summary>
 public string openid { get; set; }
 /// <summary>
 /// access_token用于获取收货地址js函数入口参数
 /// </summary>
 public string access_token { get; set; }
 /// <summary>
 /// 商品金额，用于统一下单
 /// </summary>
 public int total_fee { get; set; }
 /// <summary>
 /// 统一下单接口返回结果
 /// </summary>
 public wxpaydata unifiedorderresult { get; set; }
 public jsapipaymvc(httpcontextbase _context)
 {
 context = _context;
 }
 /**
 * 
 * 网页授权获取用户基本信息的全部过程
 * 详情请参看网页授权获取用户基本信息：http://mp.weixin.qq.com/wiki/17/c0f37d5704f0b64713d5d2c37b468d75.html
 * 第一步：利用url跳转获取code
 * 第二步：利用code去获取openid和access_token
 * 
 */
 public void getopenidandaccesstoken(string code)
 {
 if (!string.isnullorempty(code))
 {
 //获取code码，以获取openid和access_token
 log.debug(this.gettype().tostring(), "get code : " + code);
 getopenidandaccesstokenfromcode(code);
 }
 else
 {
 //构造网页授权获取code的url
 string host = context.request.url.host;
 string path = context.request.path;
 string redirect_uri = httputility.urlencode("http://" + host + path);
 wxpaydata data = new wxpaydata();
 data.setvalue("appid", wxpayconfig.appid);
 data.setvalue("redirect_uri", redirect_uri);
 data.setvalue("response_type", "code");
 data.setvalue("scope", "snsapi_base");
 data.setvalue("state", "state" + "#wechat_redirect");
 string url = "https://open.weixin.qq.com/connect/oauth2/authorize?" + data.tourl();
 log.debug(this.gettype().tostring(), "will redirect to url : " + url);
 try
 {
 //触发微信返回code码 
 context.response.redirect(url);//redirect函数会抛出threadabortexception异常，不用处理这个异常
 }
 catch(system.threading.threadabortexception ex)
 {
 }
 }
 }
 /**
 * 
 * 通过code换取网页授权access_token和openid的返回数据，正确时返回的json数据包如下：
 * {
 * "access_token":"access_token",
 * "expires_in":7200,
 * "refresh_token":"refresh_token",
 * "openid":"openid",
 * "scope":"scope",
 * "unionid": "o6_bmasdasdsad6_2sgvt7hmzopfl"
 * }
 * 其中access_token可用于获取共享收货地址
 * openid是微信支付jsapi支付接口统一下单时必须的参数
 * 更详细的说明请参考网页授权获取用户基本信息：http://mp.weixin.qq.com/wiki/17/c0f37d5704f0b64713d5d2c37b468d75.html
 * @失败时抛异常wxpayexception
 */
 public void getopenidandaccesstokenfromcode(string code)
 {
 try
 {
 //构造获取openid及access_token的url
 wxpaydata data = new wxpaydata();
 data.setvalue("appid", wxpayconfig.appid);
 data.setvalue("secret", wxpayconfig.appsecret);
 data.setvalue("code", code);
 data.setvalue("grant_type", "authorization_code");
 string url = "https://api.weixin.qq.com/sns/oauth2/access_token?" + data.tourl();
 //请求url以获取数据
 string result = httpservice.get(url);
 log.debug(this.gettype().tostring(), "getopenidandaccesstokenfromcode response : " + result);
 //保存access_token，用于收货地址获取
 jsondata jd = jsonmapper.toobject(result);
 access_token = (string)jd["access_token"];
 //获取用户openid
 openid = (string)jd["openid"];
 log.debug(this.gettype().tostring(), "get openid : " + openid);
 log.debug(this.gettype().tostring(), "get access_token : " + access_token);
 }
 catch (exception ex)
 {
 log.error(this.gettype().tostring(), ex.tostring());
 throw new wxpayexception(ex.tostring());
 }
 }
 /**
 * 调用统一下单，获得下单结果
 * @return 统一下单结果
 * @失败时抛异常wxpayexception
 */
 public wxpaydata getunifiedorderresult()
 {
 //统一下单 
 wxpaydata data = new wxpaydata();
 data.setvalue("body", "test");
 data.setvalue("attach", "test");
 data.setvalue("out_trade_no", wxpayapi.generateouttradeno());
 data.setvalue("total_fee", total_fee);
 data.setvalue("time_start", datetime.now.tostring("yyyymmddhhmmss"));
 data.setvalue("time_expire", datetime.now.addminutes(10).tostring("yyyymmddhhmmss"));
 data.setvalue("goods_tag", "test");
 data.setvalue("trade_type", "jsapi");
 data.setvalue("openid", openid);
 wxpaydata result = wxpayapi.unifiedorder(data);
 if (!result.isset("appid") || !result.isset("prepay_id") || result.getvalue("prepay_id").tostring() == "")
 {
 log.error(this.gettype().tostring(), "unifiedorder response error!");
 throw new wxpayexception("unifiedorder response error!");
 }
 unifiedorderresult = result;
 return result;
 }
 /**
 * 
 * 从统一下单成功返回的数据中获取微信浏览器调起jsapi支付所需的参数，
 * 微信浏览器调起jsapi时的输入参数格式如下：
 * {
 * "appid" : "wx2421b1c4370ec43b", //公众号名称，由商户传入 
 * "timestamp":" 1395712654", //时间戳，自1970年以来的秒数 
* "noncestr" : "e61463f8efa94090b1f366cccfbbb444", //随机串 
* "package" : "prepay_id=u802345jgfjsdfgsdg888", 
 * "signtype" : "md5", //微信签名方式: 
* "paysign" : "70ea570631e4bb79628fbca90534c63ff7fadd89" //微信签名 
 * }
 * @return string 微信浏览器调起jsapi时的输入参数，json格式可以直接做参数用
 * 更详细的说明请参考网页端调起支付api：http://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=7_7
 * 
 */
 public string getjsapiparameters()
 {
 log.debug(this.gettype().tostring(), "jsapipay::getjsapiparam is processing...");

 wxpaydata jsapiparam = new wxpaydata();
 jsapiparam.setvalue("appid", unifiedorderresult.getvalue("appid"));
 jsapiparam.setvalue("timestamp", wxpayapi.generatetimestamp());
 jsapiparam.setvalue("noncestr", wxpayapi.generatenoncestr());
 jsapiparam.setvalue("package", "prepay_id=" + unifiedorderresult.getvalue("prepay_id"));
 jsapiparam.setvalue("signtype", "md5");
 jsapiparam.setvalue("paysign", jsapiparam.makesign());
 string parameters = jsapiparam.tojson();
 log.debug(this.gettype().tostring(), "get jsapiparam : " + parameters);
 return parameters;
 }
 /**
 * 
 * 获取收货地址js函数入口参数,详情请参考收货地址共享接口：http://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=7_9
 * @return string 共享收货地址js函数需要的参数，json格式可以直接做参数使用
 */
 public string geteditaddressparameters()
 {
 string parameter = "";
 try
 {
 string host = context.request.url.host;
 string path = context.request.path;
 string querystring = context.request.url.query;
 //这个地方要注意，参与签名的是网页授权获取用户信息时微信后台回传的完整url
 string url = "http://" + host + path + querystring;
 //构造需要用sha1算法加密的数据
 wxpaydata signdata = new wxpaydata();
 signdata.setvalue("appid",wxpayconfig.appid);
 signdata.setvalue("url", url);
 signdata.setvalue("timestamp",wxpayapi.generatetimestamp());
 signdata.setvalue("noncestr",wxpayapi.generatenoncestr());
 signdata.setvalue("accesstoken",access_token);
 string param = signdata.tourl();
 log.debug(this.gettype().tostring(), "sha1 encrypt param : " + param);
 //sha1加密
 string addrsign = formsauthentication.hashpasswordforstoringinconfigfile(param, "sha1");
 log.debug(this.gettype().tostring(), "sha1 encrypt result : " + addrsign);
 //获取收货地址js函数入口参数
 wxpaydata afterdata = new wxpaydata();
 afterdata.setvalue("appid",wxpayconfig.appid);
 afterdata.setvalue("scope","jsapi_address");
 afterdata.setvalue("signtype","sha1");
 afterdata.setvalue("addrsign",addrsign);
 afterdata.setvalue("timestamp",signdata.getvalue("timestamp"));
 afterdata.setvalue("noncestr",signdata.getvalue("noncestr"));
 //转为json格式
 parameter = afterdata.tojson();
 log.debug(this.gettype().tostring(), "get editaddressparam : " + parameter);
 }
 catch (exception ex)
 {
 log.error(this.gettype().tostring(), ex.tostring());
 throw new wxpayexception(ex.tostring());
 }
 return parameter;
 }
 }
}

function onbridgeready(){
 weixinjsbridge.invoke(
 'getbrandwcpayrequest', {
 "appid" ： "wx2421b1c4370ec43b", //公众号名称，由商户传入 
 "timestamp"：" 1395712654", //时间戳，自1970年以来的秒数 
 "noncestr" ： "e61463f8efa94090b1f366cccfbbb444", //随机串 
 "package" ： "prepay_id=u802345jgfjsdfgsdg888", 
 "signtype" ： "md5", //微信签名方式： 
 "paysign" ： "70ea570631e4bb79628fbca90534c63ff7fadd89" //微信签名 
 },
 function(res){ 
 if(res.err_msg == "get_brand_wcpay_request：ok" ) {} // 使用以上方式判断前端返回,微信团队郑重提示：res.err_msg将在用户支付成功后返回 ok，但并不保证它绝对可靠。 
 }
 ); 
}

@{
 viewbag.title = "微信支付";
 layout = "~/views/shared/_layout.cshtml";
}
<div class="page" id="wxpayment">
 <div class="content">
 <div>订单详情：@html.raw(viewbag.unifiedorder)</div>
 <button id="h5pay" onclick="callpay()">支付</button>
 </div>
 <input type="hidden" value="@viewbag.ordernumber" id="ordernum"/>
</div>
<script type="text/javascript">
 //调用微信js api 支付
 function jsapicall() {
 weixinjsbridge.invoke(
 'getbrandwcpayrequest',
 @html.raw(viewbag.wxjsapiparam),//josn串
 function (res)
 {
 weixinjsbridge.log(res.err_msg);
 //alert(res.err_code + res.err_desc + res.err_msg);
 if (res.err_msg == "get_brand_wcpay_request:ok") {
 var num = $("#ordernum").val();
 $.post("/payment/weixinpaysuccess", { ordernumber: num }, function(data) {
 if (data.issuccess === true) {
 alert("支付成功");
 location.href = document.referrer;
 } else {
 }
 });
 } 
 if (res.err_msg == 'get_brand_wcpay_request:cancel') {
 $('.button').removeattr('submitting');
 alert('取消支付');
 } 
 }
 );
 }
 function callpay()
 {
 if (typeof weixinjsbridge == "undefined")
 {
 alert("weixinjsbridge =");
 if (document.addeventlistener)
 {
 document.addeventlistener('weixinjsbridgeready', jsapicall, false);
 }
 else if (document.attachevent)
 {
 document.attachevent('weixinjsbridgeready', jsapicall);
 document.attachevent('onweixinjsbridgeready', jsapicall);
 }
 }
 else
 {
 jsapicall();
 }
 }
</script>