4.12微信支付
微信支付：https://pay.weixin.qq.com/
微信支付方式：https://pay.weixin.qq.com/static/product/product_intro.shtml?name=jsapi
开发准备
账号申请
- 申请商户号
- 申请公众号或小程序应用或app
支付方式选择
- PC端：Native支付
- 移动端：H5支付
JSAPI支付和Native支付区别： JSAPI支付的金额需要用户收到输入。 Native支付的金额是用户扫描微信二维码后自动带出。
开发准备
https://pay.weixin.qq.com/wiki/doc/apiv3/open/pay/chapter2_7_1.shtml
申请APPID——申请公众号或小程序应用或app获得
申请mchid ——申请商户号获得
APPID及mchid——申请公众号或小程序应用或app获得
配置API key——根据文档获得
下载并配置商户证书
mchid:1600686718
appId:wx6f3cca7cd16125e9
appSecret:a1e164e950e15dcb8a20017f12bcc5a
apiV3Key:IZOBZjAPlCaCjDCPizQCooP1OfXewn4i
私钥：apiclient_key.pem
证书序列号：51BCB144BAF201F5314A0841EAC3239A9F3F2E5F开发
开发指引：https://pay.weixin.qq.com/wiki/doc/apiv3/open/pay/chapter2_7_2.shtml
不要看最新的：https://pay.weixin.qq.com/wiki/doc/apiv3/apis/chapter3_4_1.shtml
下载微信支付demo：https://github.com/wechatpay-apiv3/wechatpay-apache-httpclient
下载好wechatpay-apache-httpclient-master.zip，仔细看test的代码
依赖
<dependency>
<groupId>com.github.wechatpay-apiv3</groupId>
<artifactId>wechatpay-apache-httpclient</artifactId>
<version>0.4.9</version>
</dependency>初始化httpclient
java
@Before
public void setup() throws IOException {
// 加载商户私钥（privateKey：私钥字符串）
PrivateKey merchantPrivateKey = PemUtil
.loadPrivateKey(new ByteArrayInputStream(privateKey.getBytes("utf-8")));
// 加载平台证书（mchId：商户号,mchSerialNo：商户证书序列号,apiV3Key：V3密钥）
AutoUpdateCertificatesVerifier verifier = new AutoUpdateCertificatesVerifier(
new WechatPay2Credentials(mchId, new PrivateKeySigner(mchSerialNo, merchantPrivateKey)),apiV3Key.getBytes("utf-8"));
// 初始化httpClient
httpClient = WechatPayHttpClientBuilder.create()
.withMerchant(mchId, mchSerialNo, merchantPrivateKey)
.withValidator(new WechatPay2Validator(verifier)).build();
}native下单（生成二维码）
java
@org.junit.Test
public void CreateOrder() throws Exception{
HttpPost httpPost = new HttpPost("https://api.mch.weixin.qq.com/v3/pay/transactions/native");
// 请求body参数
// 金额
JSONObject amount = new JSONObject();
amount.put("total", 100);
amount.put("currency", "CNY");
// 商定
JSONObject settlement = new JSONObject();
settlement.put("appid", appId);
settlement.put("mchid", mchId);
settlement.put("description","测试");
settlement.put("out_trade_no", "2014102800030956");
settlement.put("notify_url", notify_url);
settlement.put("amount", amount);
String reqdata = JSON.toJSONString(settlement);
StringEntity entity = new StringEntity(reqdata,"utf-8");
entity.setContentType("application/json");
httpPost.setEntity(entity);
httpPost.setHeader("Accept", "application/json");
//完成签名并执行请求
CloseableHttpResponse response = httpClient.execute(httpPost);
try {
int statusCode = response.getStatusLine().getStatusCode();
if (statusCode == 200) { //处理成功
System.out.println("success,return body = " + EntityUtils.toString(response.getEntity()));
} else if (statusCode == 204) { //处理成功，无返回Body
System.out.println("success");
} else {
System.out.println("failed,resp code = " + statusCode+ ",return body = " + EntityUtils.toString(response.getEntity()));
throw new IOException("request failed");
}
} finally {
response.close();
}
}草料二维码：https://cli.im/text/other
支付通知（异步通知）
https://pay.weixin.qq.com/docs/merchant/apis/native-payment/payment-notice.html
参数解密
下面详细描述对通知数据进行解密的流程：
- 用商户平台上设置的APIv3密钥【微信商户平台—>账户设置—>API安全—>设置APIv3密钥】，记为key；
- 针对resource.algorithm中描述的算法（目前为AEAD_AES_256_GCM），取得对应的参数nonce和associated_data；
- 使用key、nonce和associated_data，对数据密文resource.ciphertext进行解密，得到JSON形式的资源对象；
js
{
"id": "EV-2018022511223320873",
"create_time": "2015-05-20T13:29:35+08:00",
"resource_type": "encrypt-resource",
"event_type": "TRANSACTION.SUCCESS",
"summary": "支付成功",
"resource": {
"original_type": "transaction",
"algorithm": "AEAD_AES_256_GCM",
"ciphertext": "",
"associated_data": "",
"nonce": ""
}
}对resource对象进行解密后，得到的资源对象示例
js
{
"transaction_id":"1217752501201407033233368018",
"amount":{
"payer_total":100,
"total":100,
"currency":"CNY",
"payer_currency":"CNY"
},
"mchid":"1230000109",
"trade_state":"SUCCESS",
"bank_type":"CMC",
"promotion_detail":[
{
"amount":100,
"wechatpay_contribute":0,
"coupon_id":"109519",
"scope":"GLOBAL",
"merchant_contribute":0,
"name":"单品惠-6",
"other_contribute":0,
"currency":"CNY",
"stock_id":"931386",
"goods_detail":[
{
"goods_remark":"商品备注信息",
"quantity":1,
"discount_amount":1,
"goods_id":"M1006",
"unit_price":100
},
{
"goods_remark":"商品备注信息",
"quantity":1,
"discount_amount":1,
"goods_id":"M1006",
"unit_price":100
}
]
},
{
"amount":100,
"wechatpay_contribute":0,
"coupon_id":"109519",
"scope":"GLOBAL",
"merchant_contribute":0,
"name":"单品惠-6",
"other_contribute":0,
"currency":"CNY",
"stock_id":"931386",
"goods_detail":[
{
"goods_remark":"商品备注信息",
"quantity":1,
"discount_amount":1,
"goods_id":"M1006",
"unit_price":100
},
{
"goods_remark":"商品备注信息",
"quantity":1,
"discount_amount":1,
"goods_id":"M1006",
"unit_price":100
}
]
}
],
"success_time":"2018-06-08T10:34:56+08:00",
"payer":{
"openid":"oUpF8uMuAJO_M2pxb1Q9zNjWeS6o"
},
"out_trade_no":"1217752501201407033233368018",
"AppID":"wxd678efh567hg6787",
"trade_state_desc":"支付成功",
"trade_type":"MICROPAY",
"attach":"自定义数据",
"scene_info":{
"device_id":"013467007045764"
}
}取出订单id和自己需要的数据
通知应答
接收成功： HTTP应答状态码需返回200或204，无需返回应答报文。
接收失败： HTTP应答状态码需返回5XX或4XX，同时需返回应答报文，格式如下：
js
{
"code": "FAIL",
"message": "失败"
}