java微信支付v3系列——5.微信支付成功回调

2023-09-06 19:25

短信预约 -IT技能 免费直播动态提醒

正文

同样的通知可能会多次发送给商户系统。商户系统必须能够正确处理重复的通知。推荐的做法是，当商户系统收到通知进行处理时，先检查对应业务数据的状态，并判断该通知是否已经处理。如果未处理，则再进行处理；如果已处理，则直接返回结果成功。在对业务数据进行状态检查和处理之前，要采用数据锁进行并发控制，以避免函数重入造成的数据混乱。

如果在所有通知频率后没有收到微信侧回调，商户应调用查询订单接口确认订单状态。

特别提醒：商户系统对于开启结果通知的内容一定要做签名验证，并校验通知的信息是否与商户侧的信息一致，防止数据泄露导致出现“假通知”，造成资金损失。

该链接是通过基础下单接口中的请求参数“notify_url”来设置的，要求必须为https地址。请确保回调URL是外部可正常访问的，且不能携带后缀参数，否则可能导致商户无法接收到微信的回调通知信息。

微信验签工具类

啥也不说了，直接复制即可，也没什么注意事项。

import com.wechat.pay.contrib.apache.httpclient.auth.Verifier;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import javax.servlet.http.HttpServletRequest;import java.io.IOException;import java.nio.charset.StandardCharsets;import java.time.DateTimeException;import java.time.Duration;import java.time.Instant;import static com.wechat.pay.contrib.apache.httpclient.constant.WechatPayHttpHeaders.*;public class WechatPayValidatorForRequest {    protected static final Logger log = LoggerFactory.getLogger(WechatPayValidatorForRequest.class);        protected static final long RESPONSE_EXPIRED_MINUTES = 5;    protected final Verifier verifier;    protected final String body;    protected final String requestId;    public WechatPayValidatorForRequest(Verifier verifier, String body, String requestId) {        this.verifier = verifier;        this.body = body;        this.requestId = requestId;    }    protected static IllegalArgumentException parameterError(String message, Object... args) {        message = String.format(message, args);        return new IllegalArgumentException("parameter error: " + message);    }    protected static IllegalArgumentException verifyFail(String message, Object... args) {        message = String.format(message, args);        return new IllegalArgumentException("signature verify fail: " + message);    }    public final boolean validate(HttpServletRequest request) throws IOException {        try {            validateParameters(request);            String message = buildMessage(request);            String serial = request.getHeader(WECHAT_PAY_SERIAL);            String signature = request.getHeader(WECHAT_PAY_SIGNATURE);            if (!verifier.verify(serial, message.getBytes(StandardCharsets.UTF_8), signature)) {                throw verifyFail("serial=[%s] message=[%s] sign=[%s], request-id=[%s]",                        serial, message, signature, request.getHeader(REQUEST_ID));            }        } catch (IllegalArgumentException e) {            log.warn(e.getMessage());            return false;        }        return true;    }    protected final void validateParameters(HttpServletRequest request) {        // NOTE: ensure HEADER_WECHAT_PAY_TIMESTAMP at last        String[] headers = {WECHAT_PAY_SERIAL, WECHAT_PAY_SIGNATURE, WECHAT_PAY_NONCE, WECHAT_PAY_TIMESTAMP};        String header = null;        for (String headerName : headers) {            header = request.getHeader(headerName);            if (header == null) {                throw parameterError("empty [%s], request-id=[%s]", headerName, requestId);            }        }        String timestampStr = header;        try {            Instant responseTime = Instant.ofEpochSecond(Long.parseLong(timestampStr));            // 拒绝过期应答            if (Duration.between(responseTime, Instant.now()).abs().toMinutes() >= RESPONSE_EXPIRED_MINUTES) {                throw parameterError("timestamp=[%s] expires, request-id=[%s]", timestampStr, requestId);            }        } catch (DateTimeException | NumberFormatException e) {            throw parameterError("invalid timestamp=[%s], request-id=[%s]", timestampStr, requestId);        }    }    protected final String buildMessage(HttpServletRequest request) throws IOException {        String timestamp = request.getHeader(WECHAT_PAY_TIMESTAMP);        String nonce = request.getHeader(WECHAT_PAY_NONCE);        return timestamp + "\n"                + nonce + "\n"                + body + "\n";    }}

对称解密方法

创建 WxPayCallbackUtil 微信支付成功回调类，decryptFromResource用于解密微信

import com.card.config.WxPayConfig;import com.card.exception.DefaultException;import com.card.pay.domain.WxchatCallbackRefundData;import com.card.pay.domain.WxchatCallbackSuccessData;import com.card.utils.HttpUtils;import com.card.utils.WechatPayValidatorForRequest;import com.google.gson.Gson;import com.wechat.pay.contrib.apache.httpclient.auth.Verifier;import com.wechat.pay.contrib.apache.httpclient.util.AesUtil;import lombok.extern.slf4j.Slf4j;import org.apache.commons.lang3.StringUtils;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException;import java.math.BigDecimal;import java.nio.charset.StandardCharsets;import java.security.GeneralSecurityException;import java.util.HashMap;import java.util.Map;import java.util.function.Consumer;@Slf4jpublic class WxPayCallbackUtil {        private static String decryptFromResource(HashMap<String, Object> bodyMap, WxPayConfig wxPayConfig) {        // 通知数据        Map<String, String> resourceMap = (Map) bodyMap.get("resource");        // 数据密文        String ciphertext = resourceMap.get("ciphertext");        // 随机串        String nonce = resourceMap.get("nonce");        // 附加数据        String associateData = resourceMap.get("associated_data");        AesUtil aesUtil = new AesUtil(wxPayConfig.getKey().getBytes(StandardCharsets.UTF_8));        try {            return aesUtil.decryptToString(associateData.getBytes(StandardCharsets.UTF_8), nonce.getBytes(StandardCharsets.UTF_8), ciphertext);        } catch (GeneralSecurityException e) {            e.printStackTrace();            throw new DefaultException("解密失败");        }    }}

封装微信返回的数据对象

微信返回给我们的数据是json格式的，我们需要将其转换成java对象，方便我们调用。

import cn.hutool.core.date.DateUtil;import lombok.AllArgsConstructor;import lombok.Data;import lombok.NoArgsConstructor;import lombok.extern.slf4j.Slf4j;import java.math.BigDecimal;import java.util.Date;@Data@Slf4jpublic class WxchatCallbackSuccessData {        private String orderId;        private String transactionId;        private String tradestate;        private Date successTime;        private String tradetype;        private BigDecimal totalMoney;    public Date getSuccessTime() {        return successTime;    }    public void setSuccessTime(String successTime) {        // Hutool工具包的方法，自动识别一些常用格式的日期字符串        this.successTime = DateUtil.parse(successTime);    }}

支付成功回调使用方法

我们先不看回调是如何封装的，先来看使用方法。

@Autowiredprivate WxPayConfig wxPayConfig;@Autowiredprivate Verifier verifier;@ApiOperation("微信支付回调接口")@PostMapping("/wx/callback")public String courseNative(HttpServletRequest request, HttpServletResponse response) {    return WxPayCallbackUtil.wxPaySuccessCallback(request, response, verifier, wxPayConfig, callbackData -> {        // TODO 处理你的业务逻辑，下面说一下一般业务逻辑处理方法        log.info("微信支付返回的信息：{}", callbackData);        // 1.根据订单id获取订单信息        // 2.判断金额是否相符，如果不相符则调用退款接口，并取消该订单，通知客户支付金额不符        // 3.查询订单状态是否是未支付，如果是未支付则改为已支付，填充其他逻辑，        // 4.如果是其他状态综合你的业务逻辑来处理        // 5.如果是虚拟物品，则对应充值，等等其他逻辑    });}

封装后就这么一句话，就获取到了微信返回给我们的数据，其中callbackData就是上面封装的WxchatCallbackSuccessData对象，我们只需要在回调方法中完成我们的业务逻辑即可。

支付成功回调方法封装

import java.util.function.Consumer;import com.wechat.pay.contrib.apache.httpclient.auth.Verifier;import com.wechat.pay.contrib.apache.httpclient.util.AesUtil;import com.card.pay.domain.WxchatCallbackSuccessData;import com.card.utils.HttpUtils;import com.card.utils.WechatPayValidatorForRequest;@Slf4jpublic class WxPayCallbackUtil {       public static String wxPaySuccessCallback(HttpServletRequest request, HttpServletResponse response, Verifier verifier, WxPayConfig wxPayConfig, Consumer<WxchatCallbackSuccessData> businessCallback) {        Gson gson = new Gson();        // 1.处理通知参数        final String body = HttpUtils.readData(request);        HashMap<String, Object> bodyMap = gson.fromJson(body, HashMap.class);        // 2.签名验证        WechatPayValidatorForRequest wechatForRequest = new WechatPayValidatorForRequest(verifier, body, (String) bodyMap.get("id"));        try {            if (!wechatForRequest.validate(request)) {                // 通知验签失败                response.setStatus(500);                final HashMap<String, Object> map = new HashMap<>();                map.put("code", "ERROR");                map.put("message", "通知验签失败");                return gson.toJson(map);            }        } catch (IOException e) {            e.printStackTrace();        }        // 3.获取明文数据        String plainText = decryptFromResource(bodyMap,wxPayConfig);        HashMap<String,Object> plainTextMap = gson.fromJson(plainText, HashMap.class);        log.info("plainTextMap:{}",plainTextMap);        // 4.封装微信返回的数据        WxchatCallbackSuccessData callbackData = new WxchatCallbackSuccessData();        callbackData.setSuccessTime(String.valueOf(plainTextMap.get("success_time")));        callbackData.setOrderId(String.valueOf(plainTextMap.get("out_trade_no")));        callbackData.setTransactionId(String.valueOf(plainTextMap.get("transaction_id")));        callbackData.setTradestate(String.valueOf(plainTextMap.get("trade_state")));        callbackData.setTradetype(String.valueOf(plainTextMap.get("trade_type")));        String amount = String.valueOf(plainTextMap.get("amount"));        HashMap<String,Object> amountMap = gson.fromJson(amount, HashMap.class);        String total = String.valueOf(amountMap.get("total"));        callbackData.setTotalMoney(new BigDecimal(total).movePointLeft(2));        log.info("callbackData:{}",callbackData);        if ("SUCCESS".equals(callbackData.getTradestate())) {            // 执行业务逻辑            businessCallback.accept(callbackData);        }        // 5.成功应答        response.setStatus(200);        final HashMap<String, Object> resultMap = new HashMap<>();        resultMap.put("code", "SUCCESS");        resultMap.put("message", "成功");        return gson.toJson(resultMap);    }        private static String decryptFromResource(HashMap<String, Object> bodyMap, WxPayConfig wxPayConfig) {        // 通知数据        Map<String, String> resourceMap = (Map) bodyMap.get("resource");        // 数据密文        String ciphertext = resourceMap.get("ciphertext");        // 随机串        String nonce = resourceMap.get("nonce");        // 附加数据        String associateData = resourceMap.get("associated_data");        AesUtil aesUtil = new AesUtil(wxPayConfig.getKey().getBytes(StandardCharsets.UTF_8));        try {            return aesUtil.decryptToString(associateData.getBytes(StandardCharsets.UTF_8), nonce.getBytes(StandardCharsets.UTF_8), ciphertext);        } catch (GeneralSecurityException e) {            e.printStackTrace();            throw new DefaultException("解密失败");        }    }}