微信V3 - 微信支付统一下单 --01

ゝ一世哀愁。 2021-09-07 09:24 822阅读 0赞

准备工作：  
private static PrivateKey merchantPrivateKey;

static \{  
try \{  
merchantPrivateKey = PemUtil.loadPrivateKey(new ByteArrayInputStream(WXConfig.PRIVATE\_KEY.getBytes(“utf-8”)));  
\} catch (UnsupportedEncodingException e) \{  
e.printStackTrace();  
\}  
\}  
WXConfig为证书，密钥文件 这里PRIVATE\_KEY 为apiclient\_cert.p12 文件密钥值

定义公共方法：  
public class PemUtil \{

/**
     * 本地密钥默认申请
     * @param inputStream
     * @return java.security.PrivateKey
     * @exception 
     * @date 2021/4/6 11:26
     * @author 
     **/
    public static PrivateKey loadPrivateKey(InputStream inputStream) {
        try {
            ByteArrayOutputStream array = new ByteArrayOutputStream();
            byte[] buffer = new byte[1024];
    
            int length;
            while((length = inputStream.read(buffer)) != -1) {
                array.write(buffer, 0, length);
            }
    
            String privateKey = array.toString("utf-8").replace("-----BEGIN PRIVATE KEY-----", "").replace("-----END PRIVATE KEY-----", "").replaceAll("\\s+", "");
            KeyFactory kf = KeyFactory.getInstance("RSA");
            return kf.generatePrivate(new PKCS8EncodedKeySpec(Base64.getDecoder().decode(privateKey)));
        } catch (NoSuchAlgorithmException var6) {
            throw new RuntimeException("当前Java环境不支持RSA", var6);
        } catch (InvalidKeySpecException var7) {
            throw new RuntimeException("无效的密钥格式");
        } catch (IOException var8) {
            throw new RuntimeException("无效的密钥");
        }
    }
    
    /**
     * 证书验证
     * @param inputStream
     * @return java.security.cert.X509Certificate
     * @exception 
     * @date 2021/4/6 11:26
     * @author
     **/
    public static X509Certificate loadCertificate(InputStream inputStream) {
        try {
            CertificateFactory cf = CertificateFactory.getInstance("X509");
            X509Certificate cert = (X509Certificate)cf.generateCertificate(inputStream);
            cert.checkValidity();
            return cert;
        } catch (CertificateExpiredException var3) {
            throw new RuntimeException("证书已过期", var3);
        } catch (CertificateNotYetValidException var4) {
            throw new RuntimeException("证书尚未生效", var4);
        } catch (CertificateException var5) {
            throw new RuntimeException("无效的证书", var5);
        }
    }

微信支付统一下单

@PostMapping("/wx/v3/getPreyId")
        public JsonResult getPreyId(@RequestBody PayParam payParam) throws Exception {
    
            //订单金额  总金额是以分的形式来体现的 请APP 端数据统一处理
            Amount amount = new Amount()
                    .setTotal(payParam.getTotalMoney())  //订单总金额
                    .setCurrency("CNY");                 //CNY：人民币，境内商户号仅支持人民币
    
            UnifiedOrderModel unifiedOrderModel = new UnifiedOrderModel()
                    .setAppid(WXConfig.APP_ID)      //直连商户在开放平台申请的应用appid
                    .setMchid(WXConfig.MCH_ID)     //直连商户的商户号，由微信支付生成并下发
                    .setDescription("商品描述")       //商品描述
                    .setOut_trade_no(payParam.getOrderNum())    //商户系统内部订单号，只能是数字、大小写字母_-*且在同一个商户号下唯一
                    .setNotify_url(WXConfig.NOTIFY_URL)         //通知URL必须为直接可访问的URL，不允许携带查询串  //用于支付成功回调接口
                    .setAmount(amount);                         //订单金额
    
            IJPayHttpResponse response = WxPayApi.v3(
                    RequestMethod.POST,          //请求方式
                    WxDomain.CHINA.toString(),   //存放微信自己内部地址
                    WxApiType.APP_PAY.toString(), //微信内部封装的统一下单接口
                    WXConfig.MCH_ID,              //商户Id
                    WXConfig.MCH_SERIAL_NO,       //商户证书序列号
                    null,
                    merchantPrivateKey,           //密钥
                    JSONUtil.toJsonStr(unifiedOrderModel)
            );
            String body = response.getBody();
            //数字签名是否有效
            String timestamp = response.getHeader("Wechatpay-Timestamp");
            String nonceStr = response.getHeader("Wechatpay-Nonce");
            String signature = response.getHeader("Wechatpay-Signature");
            boolean verifySignature = WxPayKit.verifySignature(signature, body, nonceStr, timestamp,
                    new ClassPathResource(WXConfig.PLATFORM_CERT_PATH).getInputStream());
            //System.out.println(verifySignature);
            return JsonResult.buildSuccess("ok", body);
        }

亲测有效