第三方支付5(公众号支付)
微信公众号支付
微信公众号支付的总体其实很简单，大致就分为三步。第一步需要获取用户授权；第二步调用统一下单接口获取预支付id；第三步H5调起微信支付的内置的js。下面介绍具体每一步的开发流程。
一 首先要明确微信公众号支付属于网页版支付，所以相较于app的直接调取微信支付要多一步微信授权。也就是需要获取用户的openid。微信公众号使用的交易类型是JSAPI，所以统一下单接口的文档明确的写到
因此我们必须去获取openid，同时也可以处理一些我们需要的逻辑。获取用户授权有两种方式:1.scope=snsapi_base;2.scope=snsapi_userinfo.我使用的是snsapi_base
Scope为snsapi_base
https://open.weixin.qq.com/connect/oauth2/authorize?appid=wx520c15f417810387&redirect_uri=http%3A%2F%2Fchong.qq.com%2Fphp%2Findex.php%3Fd%3D%26c%3DwxAdapter%26m%3DmobileDeal%26showwxpaytitle%3D1%26vb2ctag%3D4_2030_5_1194_60&response_type=code&scope=snsapi_base&state=123#wechat_redirect
Scope为snsapi_userinfo
https://open.weixin.qq.com/connect/oauth2/authorize?appid=wxf0e81c3bee622d60&redirect_uri=http%3A%2F%2Fnba.bluewebgame.com%2Foauth_response.php&response_type=code&scope=snsapi_userinfo&state=STATE#wechat_redirect
微信的官方文档也有对各个参数的详细说明，我就关键的参数仔细的说明一下。首先appid就不多说了就是你微信公众号的appid固定写死的，redirect_uri这个参数是最重要的，这个地址是访问你处理的接口地址。你可以在这个链接上拼接上你所需要的参数，一般你是要把订单的金额传到这个接口里的，访问这个链接的时候微信会给你code你需要用它去获取openid，记得要对其进行urlencode处理。state参数可以理解为扩展字段，其他的参数都是固定写法就不在多做介绍了。下面是获取openid的代码片段。
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//获取openId
HttpClientUtil util = HttpClientUtil.getInstance();
Map
new
HashMap
map.put(
"appid"
, WxPayConfig.APPID);
map.put(
"secret"
, WxPayConfig.APPSECRET);
map.put(
"code"
, code);
map.put(
"grant_type"
, WxPayConfig.GRANT_TYPE);
String returnStr = util.doPostRetString(
"https://api.weixin.qq.com/sns/oauth2/access_token"
,
null
,map);
logger.info(
"returnStr:["
+ returnStr +
"]"
);
AccessToken at = JSON.parseObject(returnStr, AccessToken.
class
);
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AccessToken.java
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public
class
AccessToken {
private
String access_token;
private
String expires_in;
private
String refresh_token;
private
String openid;
private
String scope;
private
String unionid;
public
String getAccess_token() {
return
access_token;
}
public
void
setAccess_token(String access_token) {
this
.access_token = access_token;
}
public
String getExpires_in() {
return
expires_in;
}
public
void
setExpires_in(String expires_in) {
this
.expires_in = expires_in;
}
public
String getRefresh_token() {
return
refresh_token;
}
public
void
setRefresh_token(String refresh_token) {
this
.refresh_token = refresh_token;
}
public
String getOpenid() {
return
openid;
}
public
void
setOpenid(String openid) {
this
.openid = openid;
}
public
String getScope() {
return
scope;
}
public
void
setScope(String scope) {
this
.scope = scope;
}
public
String getUnionid() {
return
unionid;
}
public
void
setUnionid(String unionid) {
this
.unionid = unionid;
}
@Override
public
String toString() {
return
"AccessToken [access_token="
+ access_token +
", expires_in="
+ expires_in +
", refresh_token="
+ refresh_token +
", openid="
+ openid +
", scope="
+ scope +
", unionid="
+ unionid +
"]"
;
}
}
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二 我们获取了openid后，就可以进行下一步的统一下单的开发了。微信上统一下单接口的文档写的比较详细了，具体的参数含义我就不多做介绍了。下面直接贴最直观的代码，特别提醒的是一定要注意签名的正确。签名所使用的key并不是AppSecret而是你申请时自己定义的商户key。
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//统一下单
WxPaySendData data =
new
WxPaySendData();
data.setAppid(WxPayConfig.APPID);
data.setAttach(
"微信支付"
);
data.setBody(
"微信公众号支付"
);
data.setMch_id(WxPayConfig.MCHID);
data.setNonce_str(nonceStr);
data.setNotify_url(WxPayConfig.NOTIFY_URL);
data.setOut_trade_no(tradeNo);
data.setTotal_fee((
int
)(fee*
100
));
//单位：分
data.setTrade_type(
"JSAPI"
);
data.setSpbill_create_ip(ip);
data.setOpenid(at.getOpenid());
String returnXml = UnifiedorderService.unifiedOrder(data,WxPayConfig.KEY);
WxPayReturnData reData =
new
WxPayReturnData();
XStream xs1 =
new
XStream(
new
DomDriver());
xs1.alias(
"xml"
, WxPayReturnData.
class
);
reData = (WxPayReturnData) xs1.fromXML(returnXml);
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UnifiedorderService.java
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public
class
UnifiedorderService {
private
final
static
Logger logger = LoggerFactory.getLogger(UnifiedorderService.
class
);
public
static
String unifiedOrder(WxPaySendData data,String key){
//统一下单支付
String returnXml =
null
;
try
{
//生成sign签名
SortedMap
new
TreeMap
parameters.put(
"appid"
, data.getAppid());
parameters.put(
"attach"
, data.getAttach());
parameters.put(
"body"
, data.getBody());
parameters.put(
"mch_id"
, data.getMch_id());
parameters.put(
"nonce_str"
, data.getNonce_str());
parameters.put(
"notify_url"
, data.getNotify_url());
parameters.put(
"out_trade_no"
, data.getOut_trade_no());
parameters.put(
"total_fee"
, data.getTotal_fee());
parameters.put(
"trade_type"
, data.getTrade_type());
parameters.put(
"spbill_create_ip"
, data.getSpbill_create_ip());
parameters.put(
"openid"
, data.getOpenid());
parameters.put(
"device_info"
, data.getDevice_info());
logger.info(
"SIGN:"
+WxSign.createSign(parameters,key));
data.setSign(WxSign.createSign(parameters,key));
XStream xs =
new
XStream(
new
DomDriver(
"UTF-8"
,
new
XmlFriendlyNameCoder(
"-_"
,
"_"
)));
xs.alias(
"xml"
, WxPaySendData.
class
);
String xml = xs.toXML(data);
logger.info(
"统一下单xml为:\n"
+ xml);
HttpClientUtil util = HttpClientUtil.getInstance();
returnXml = util.doPostForString(
"https://api.mch.weixin.qq.com/pay/unifiedorder"
,
null
, xml);
logger.info(
"返回结果:"
+ returnXml);
}
catch
(Exception e) {
e.printStackTrace();
}
return
returnXml;
}
}
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WxSign
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public
class
WxSign {
private
static
String characterEncoding =
"UTF-8"
;
@SuppressWarnings
(
"rawtypes"
)
public
static
String createSign(SortedMap
StringBuffer sb =
new
StringBuffer();
Set es = parameters.entrySet();
//所有参与传参的参数按照accsii排序（升序）
Iterator it = es.iterator();
while
(it.hasNext()) {
Map.Entry entry = (Map.Entry)it.next();
String k = (String)entry.getKey();
Object v = entry.getValue();
if
(
null
!= v && !
""
.equals(v)
&& !
"sign"
.equals(k) && !
"key"
.equals(k)) {
sb.append(k +
"="
+ v +
"&"
);
}
}
sb.append(
"key="
+ key);
String sign = MD5Util.MD5Encode(sb.toString(), characterEncoding).toUpperCase();
return
sign;
}
public
static
String getNonceStr() {
Random random =
new
Random();
return
MD5Util.MD5Encode(String.valueOf(random.nextInt(
10000
)),
"UTF-8"
);
}
public
static
String getTimeStamp() {
return
String.valueOf(System.currentTimeMillis() /
1000
);
}
}
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最后要提一下的是NOTIFY_URL回调地址，接收微信支付异步通知回调地址。
三 通过上面的操作我们获得了预支付交易会话标识prepay_id，这样我们就可以进行最后一步的操作了。使用H5调起支付api。
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//H5调起支付
attr.addAttribute(
"appId"
, reData.getAppid());
attr.addAttribute(
"timeStamp"
, WxSign.getTimeStamp());
attr.addAttribute(
"nonceStr"
, reData.getNonce_str());
attr.addAttribute(
"package"
,
"prepay_id="
+reData.getPrepay_id());
attr.addAttribute(
"signType"
,
"MD5"
);
SortedMap
new
TreeMap
signMap.put(
"appId"
, reData.getAppid());
signMap.put(
"timeStamp"
, WxSign.getTimeStamp());
signMap.put(
"nonceStr"
, reData.getNonce_str());
signMap.put(
"package"
,
"prepay_id="
+reData.getPrepay_id());
signMap.put(
"signType"
,
"MD5"
);
logger.info(
"PaySIGN:"
+WxSign.createSign(signMap,WxPayConfig.KEY));
attr.addAttribute(
"paySign"
, WxSign.createSign(signMap,WxPayConfig.KEY));
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将需要的参数传给页面后，使用微信提供方法调起支付。
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注：在返回结果的地方可以自定义一些自己的返回页面。
觉得本文对您有帮助，，，，，，关注一下呗。