微信小程序支付回调 java后台

这里接着上一篇微信支付开始 （https://blog.csdn.net/qq_39897814/article/details/88890484）

以下是微信支付的回调，可能有人在这里的回调中的验签不通过也可以看一下，因为我也是一开始没通过，经过各种查资料最终成功

其实微信支付回调的验签就是讲微信回调返回给你的全部数据除去sign外中心加密一次和微信回调返回的sign进行对比，一致就通过，不一致说明有风险有可能被改过，所以有回调验签不通过的朋友可以将微信回调的sign先提出来 然后从返回的数据中心去掉在重新加密对比 也可以继续往下看

    /**
    *微信支付回调
    */
    @RequestMapping("notify")
    public String notify(HttpServletRequest request) {
        log.info("================================================开始处理微信小程序发送的异步通知");

        //1 获取微信支付异步回调结果
        String xmlResult = WeiXinPayUtil.getPostStr(request);

        Map resultMap = null;
        try {
            //将结果转成map
            resultMap = WXPayUtil.xmlToMap(xmlResult);
        } catch (Exception e1) {
            e1.printStackTrace();
        }
        //订单号
        String orderNo = resultMap.get("out_trade_no");
        log.info("订单号：------------------"+orderNo+"结束----------");
        String result_code = resultMap.get("result_code");
        //回调返回的加密签名 保存下来 下面会进行对比
        String sign = resultMap.get("sign");
        //去掉sign和利用微信回调回来的信息重新加密
        resultMap.remove("sign");
        String sign1="";
        try {
            //重新加密 获取加密的签名
             sign1=WXPayUtil.generateSignature(resultMap, WXMiniPayConfig.KEY); //签名
        }catch (Exception e){

        }

 
        String resultCode;
        String resultMsg;
        //对比微信回调的加密与重新加密是否一致  一致即为通过 不一致说明呗改动过 加密不通过
        log.info("==============================================开始对比加密++++++++++++++++++++++++++++++++++++++");
        if (sign.equals(sign1)) { //验签通过
            log.info("==============================================验签通过++++++++++++++++++++++++++++++++++++++");
          
                if (WXPayEnum.isPaymentSuccess(result_code)) {//业务结果为SUCCESS
                    /**
                     * 这里写你要处理的逻辑
                     */
                    resultCode = "SUCCESS";
                    resultMsg = "成功";
                } else { // 业务结果为FALL
                    resultCode = "FAIL"
                    resultMsg = "业务结果为FAIL";
                }
         
        } else {
            resultCode = "FAIL";
            resultMsg = "验签未通过";
        }

        Map returnMap = new HashMap<>();
        returnMap.put("return_code", resultCode);
        returnMap.put("return_msg", resultMsg);
        try {
            String s = WXPayUtil.mapToXml(returnMap);
            return s;
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
    }

这样结果就通过了，有回调前名验证没通过的朋友 要好好看看代码中的注释

所需工具类

public class WeiXinPayUtil {


    /**
     * 微信回调参数解析
     *
     * @param request
     * @return
     */
    public static String getPostStr(HttpServletRequest request) {
        StringBuffer sb = new StringBuffer();
        try {
            InputStream is = request.getInputStream();
            InputStreamReader isr = new InputStreamReader(is, "UTF-8");
            BufferedReader br = new BufferedReader(isr);
            String s = "";

            while ((s = br.readLine()) != null) {
                sb.append(s);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        String xml = sb.toString(); //次即为接收到微信端发送过来的xml数据
        return xml;

    }

public class WXMiniPayConfig {

    //api秘钥  从微信商户平台(pay.weixin.qq.com)-->账户设置-->API安全-->密钥设置 获取
    public static final String KEY = "";
    //    微信支付分配的公众账号ID（企业号corpid即为此appId）
    public static final String APP_ID = "";
    //微信支付分配的商户号
    public static final String MCH_ID = "";

}

import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.StringWriter;
import java.util.*;
import java.security.MessageDigest;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import com.github.wxpay.sdk.WXPayConstants.SignType;


public class WXPayUtil {

    /**
     * XML格式字符串转换为Map
     *
     * @param strXML XML字符串
     * @return XML数据转换后的Map
     * @throws Exception
     */
    public static Map xmlToMap(String strXML) throws Exception {
        Map data = new HashMap();
        DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder documentBuilder= documentBuilderFactory.newDocumentBuilder();
        InputStream stream = new ByteArrayInputStream(strXML.getBytes("UTF-8"));
        org.w3c.dom.Document doc = documentBuilder.parse(stream);
        doc.getDocumentElement().normalize();
        NodeList nodeList = doc.getDocumentElement().getChildNodes();
        for (int idx=0; idx data) throws Exception {
        DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder documentBuilder= documentBuilderFactory.newDocumentBuilder();
        org.w3c.dom.Document document = documentBuilder.newDocument();
        org.w3c.dom.Element root = document.createElement("xml");
        document.appendChild(root);
        for (String key: data.keySet()) {
            String value = data.get(key);
            if (value == null) {
                value = "";
            }
            value = value.trim();
            org.w3c.dom.Element filed = document.createElement(key);
            filed.appendChild(document.createTextNode(value));
            root.appendChild(filed);
        }
        TransformerFactory tf = TransformerFactory.newInstance();
        Transformer transformer = tf.newTransformer();
        DOMSource source = new DOMSource(document);
        transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
        transformer.setOutputProperty(OutputKeys.INDENT, "yes");
        StringWriter writer = new StringWriter();
        StreamResult result = new StreamResult(writer);
        transformer.transform(source, result);
        String output = writer.getBuffer().toString(); //.replaceAll("\n|\r", "");
        try {
            writer.close();
        }
        catch (Exception ex) {
        }
        return output;
    }


    /**
     * 生成带有 sign 的 XML 格式字符串
     *
     * @param data Map类型数据
     * @param key API密钥
     * @return 含有sign字段的XML
     */
    public static String generateSignedXml(final Map data, String key) throws Exception {
        return generateSignedXml(data, key, SignType.MD5);
    }

    /**
     * 生成带有 sign 的 XML 格式字符串
     *
     * @param data Map类型数据
     * @param key API密钥
     * @param signType 签名类型
     * @return 含有sign字段的XML
     */
    public static String generateSignedXml(final Map data, String key, SignType signType) throws Exception {
        String sign = generateSignature(data, key, signType);
        data.put(WXPayConstants.FIELD_SIGN, sign);
        return mapToXml(data);
    }


    /**
     * 判断签名是否正确
     *
     * @param xmlStr XML格式数据
     * @param key API密钥
     * @return 签名是否正确
     * @throws Exception
     */
    public static boolean isSignatureValid(String xmlStr, String key) throws Exception {
        Map data = xmlToMap(xmlStr);
        if (!data.containsKey(WXPayConstants.FIELD_SIGN) ) {
            return false;
        }
        String sign = data.get(WXPayConstants.FIELD_SIGN);
        return generateSignature(data, key).equals(sign);
    }

    /**
     * 判断签名是否正确，必须包含sign字段，否则返回false。使用MD5签名。
     *
     * @param data Map类型数据
     * @param key API密钥
     * @return 签名是否正确
     * @throws Exception
     */
    public static boolean isSignatureValid(Map data, String key) throws Exception {
        return isSignatureValid(data, key, SignType.MD5);
    }

    /**
     * 判断签名是否正确，必须包含sign字段，否则返回false。
     *
     * @param data Map类型数据
     * @param key API密钥
     * @param signType 签名方式
     * @return 签名是否正确
     * @throws Exception
     */
    public static boolean isSignatureValid(Map data, String key, SignType signType) throws Exception {
        if (!data.containsKey(WXPayConstants.FIELD_SIGN) ) {
            return false;
        }
        String sign = data.get(WXPayConstants.FIELD_SIGN);
        return generateSignature(data, key, signType).equals(sign);
    }

    /**
     * 生成签名
     *
     * @param data 待签名数据
     * @param key API密钥
     * @return 签名
     */
    public static String generateSignature(final Map data, String key) throws Exception {
        return generateSignature(data, key, SignType.MD5);
    }

    /**
     * 生成签名. 注意，若含有sign_type字段，必须和signType参数保持一致。
     *
     * @param data 待签名数据
     * @param key API密钥
     * @param signType 签名方式
     * @return 签名
     */
    public static String generateSignature(final Map data, String key, SignType signType) throws Exception {
        Set keySet = data.keySet();
        String[] keyArray = keySet.toArray(new String[keySet.size()]);
        Arrays.sort(keyArray);
        StringBuilder sb = new StringBuilder();
        for (String k : keyArray) {
            if (k.equals(WXPayConstants.FIELD_SIGN)) {
                continue;
            }
            if (data.get(k).trim().length() > 0) // 参数值为空，则不参与签名
                sb.append(k).append("=").append(data.get(k).trim()).append("&");
        }
        sb.append("key=").append(key);
        if (SignType.MD5.equals(signType)) {
            return MD5(sb.toString()).toUpperCase();
        }
        else if (SignType.HMACSHA256.equals(signType)) {
            return HMACSHA256(sb.toString(), key);
        }
        else {
            throw new Exception(String.format("Invalid sign_type: %s", signType));
        }
    }


    /**
     * 获取随机字符串 Nonce Str
     *
     * @return String 随机字符串
     */
    public static String generateNonceStr() {
        return UUID.randomUUID().toString().replaceAll("-", "").substring(0, 32);
    }


    /**
     * 生成 MD5
     *
     * @param data 待处理数据
     * @return MD5结果
     */
    public static String MD5(String data) throws Exception {
        java.security.MessageDigest md = MessageDigest.getInstance("MD5");
        byte[] array = md.digest(data.getBytes("UTF-8"));
        StringBuilder sb = new StringBuilder();
        for (byte item : array) {
            sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3));
        }
        return sb.toString().toUpperCase();
    }

    /**
     * 生成 HMACSHA256
     * @param data 待处理数据
     * @param key 密钥
     * @return 加密结果
     * @throws Exception
     */
    public static String HMACSHA256(String data, String key) throws Exception {
        Mac sha256_HMAC = Mac.getInstance("HmacSHA256");
        SecretKeySpec secret_key = new SecretKeySpec(key.getBytes("UTF-8"), "HmacSHA256");
        sha256_HMAC.init(secret_key);
        byte[] array = sha256_HMAC.doFinal(data.getBytes("UTF-8"));
        StringBuilder sb = new StringBuilder();
        for (byte item : array) {
            sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3));
        }
        return sb.toString().toUpperCase();
    }
}