Spring Boot 微信小程序接入微信支付功能

更新時間：2024年09月19日 11:32:29 作者：令人作嘔的溏心蛋

本文詳細介紹了使用SpringBoot框架接入微信支付的全流程,包括導(dǎo)入依賴、配置微信公眾號信息、設(shè)置配置文件、編寫支付相關(guān)實體類和API地址常量、實現(xiàn)支付服務(wù)以及Controller層的編寫,感興趣的朋友跟隨小編一起看看吧

1、導(dǎo)入相關(guān)依賴 pom.yml

<!-- 微信支付 SDK -->
<dependency>
    <groupId>com.github.wxpay</groupId>
    <artifactId>wxpay-sdk</artifactId>
    <version>0.0.3</version>
</dependency>

2、文件配置微信公眾號的基礎(chǔ)信息 application.yml

# 微信支付配置 notifyUrl：微信支付異步回調(diào)地址
pay:
  appId: #小程序應(yīng)用id（小程序平臺mp.weixin.qq.com）
  apiKey: #商戶私鑰key（微信商戶平臺(pay.weixin.qq.com)-->賬戶設(shè)置-->API安全-->密鑰設(shè)置）
  mchId: #商戶號（微信商戶平臺(pay.weixin.qq.com)-->產(chǎn)品中心-->開發(fā)配置-->商戶號）
  appSecret: #小程序密鑰（小程序平臺mp.weixin.qq.com）
  notifyUrl: #支付回調(diào)地址（服務(wù)器地址https://xxxxxx）

3、設(shè)置配置文件 WxPayConfig.java

package com.ckm.ball.config.wxpay;
import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;
import org.springframework.stereotype.Component;
/**
 * 微信支付配置
 * @author lf
 * @date 2023/8/30
 */
@Data
@Component
@Configuration
@ConfigurationProperties(prefix = "pay")
public class WxPayConfig {
    /**
     * 微信公眾號appid
     */
    private String appId;
    /**
     * 公眾號設(shè)置的API v2密鑰
     */
    private String apiKey;
    /**
     * 微信商戶平臺 商戶id
     */
    private String mchId;
    /**
     *小程序密鑰
     */
    private String appSecret;
    /**
     * 小程序支付異步回調(diào)地址
     */
    private String notifyUrl;
}

4、微信支付預(yù)下單實體類 WeChatPay.java

package com.ckm.ball.config.wxpay;
import lombok.Data;
import lombok.experimental.Accessors;
/**
 * 微信支付預(yù)下單實體類
 */
@Data
@Accessors(chain = true)
public class WeChatPay {
    /**
     * 返回狀態(tài)碼  此字段是通信標(biāo)識，非交易標(biāo)識，交易是否成功需要查看result_code來判斷
     */
    public String return_code;
    /**
     * 返回信息 當(dāng)return_code為FAIL時返回信息為錯誤原因 ，例如 簽名失敗 參數(shù)格式校驗錯誤
     */
    private String return_msg;
    /**
     * 公眾賬號ID 調(diào)用接口提交的公眾賬號ID
     */
    private String appid;
    /**
     * 商戶號 調(diào)用接口提交的商戶號
     */
    private String mch_id;
    /**
     * api密鑰 詳見：https://pay.weixin.qq.com/index.php/extend/employee
     */
    private String api_key;
    /**
     * 設(shè)備號  自定義參數(shù)，可以為請求支付的終端設(shè)備號等
     */
    private String device_info;
    /**
     * 隨機字符串    5K8264ILTKCH16CQ2502SI8ZNMTM67VS   微信返回的隨機字符串
     */
    private String nonce_str;
    /**
     * 簽名 微信返回的簽名值，詳見簽名算法:https://pay.weixin.qq.com/wiki/doc/api/native.php?chapter=4_3
     */
    private String sign;
    /**
     * 簽名類型
     */
    private String sign_type;
    /**
     * 業(yè)務(wù)結(jié)果 SUCCESS SUCCESS/FAIL
     */
    private String result_code;
    /**
     * 錯誤代碼 當(dāng)result_code為FAIL時返回錯誤代碼，詳細參見下文錯誤列表
     */
    private String err_code;
    /**
     * 錯誤代碼描述 當(dāng)result_code為FAIL時返回錯誤描述，詳細參見下文錯誤列表
     */
    private String err_code_des;
    /**
     * 交易類型 JSAPI JSAPI -JSAPI支付 NATIVE -Native支付 APP -APP支付 說明詳見；https://pay.weixin.qq.com/wiki/doc/api/native.php?chapter=4_2
     */
    private String trade_type;
    /**
     * 預(yù)支付交易會話標(biāo)識 微信生成的預(yù)支付會話標(biāo)識，用于后續(xù)接口調(diào)用中使用，該值有效期為2小時
     */
    private String prepay_id;
    /**
     * 二維碼鏈接     weixin://wxpay/bizpayurl/up?pr=NwY5Mz9&groupid=00 trade_type=NATIVE時有返回，此url用于生成支付二維碼，然后提供給用戶進行掃碼支付。注意：code_url的值并非固定，使用時按照URL格式轉(zhuǎn)成二維碼即可
     */
    private String code_url;
    /**
     * 商品描述  商品簡單描述，該字段請按照規(guī)范傳遞，具體請見 https://pay.weixin.qq.com/wiki/doc/api/native.php?chapter=4_2
     */
    private String body;
    /**
     * 商家訂單號 商戶系統(tǒng)內(nèi)部訂單號，要求32個字符內(nèi)，只能是數(shù)字、大小寫字母_-|* 且在同一個商戶號下唯一。詳見商戶訂單號 https://pay.weixin.qq.com/wiki/doc/api/native.php?chapter=4_2
     */
    private String out_trade_no;
    /**
     * 標(biāo)價金額 訂單總金額，單位為分，詳見支付金額 https://pay.weixin.qq.com/wiki/doc/api/native.php?chapter=4_2
     */
    private String total_fee;
    /**
     * 終端IP 支持IPV4和IPV6兩種格式的IP地址。用戶的客戶端IP
     */
    private String spbill_create_ip;
    /**
     * 通知地址 異步接收微信支付結(jié)果通知的回調(diào)地址，通知url必須為外網(wǎng)可訪問的url，不能攜帶參數(shù)。公網(wǎng)域名必須為https，如果是走專線接入，使用專線NAT IP或者私有回調(diào)域名可使用http
     */
    private String notify_url;
    /**
     * 子商戶號 sub_mch_id 非必填（商戶不需要傳入，服務(wù)商模式才需要傳入） 微信支付分配的子商戶號
     */
    private String sub_mch_id;
    /**
     * 附加數(shù)據(jù)，在查詢API和支付通知中原樣返回，該字段主要用于商戶攜帶訂單的自定義數(shù)據(jù)
     */
    private String attach;
    /**
     * 商戶系統(tǒng)內(nèi)部的退款單號，商戶系統(tǒng)內(nèi)部唯一，只能是數(shù)字、大小寫字母_-|*@ ，同一退款單號多次請求只退一筆。
     */
    private String out_refund_no;
    /**
     * 退款總金額，單位為分，只能為整數(shù)，可部分退款。詳見支付金額 https://pay.weixin.qq.com/wiki/doc/api/native_sl.php?chapter=4_2
     */
    private String refund_fee;
    /**
     * 退款原因 若商戶傳入，會在下發(fā)給用戶的退款消息中體現(xiàn)退款原因 注意：若訂單退款金額≤1元，且屬于部分退款，則不會在退款消息中體現(xiàn)退款原因
     */
    private String refund_desc;
    /**
     * 交易結(jié)束時間 訂單失效時間，格式為yyyyMMddHHmmss，如2009年12月27日9點10分10秒表示為20091227091010。其他詳見時間規(guī)則 注意：最短失效時間間隔必須大于5分鐘
     */
    private String time_expire;
    /**
     * 用戶標(biāo)識 trade_type=JSAPI，此參數(shù)必傳，用戶在主商戶appid下的唯一標(biāo)識。openid和sub_openid可以選傳其中之一，如果選擇傳sub_openid,則必須傳sub_appid。下單前需要調(diào)用【網(wǎng)頁授權(quán)獲取用戶信息: https://developers.weixin.qq.com/doc/offiaccount/OA_Web_Apps/Wechat_webpage_authorization.html 】接口獲取到用戶的Openid。
     */
    private String openid;
    /**
     * 時間戳
     */
    private String time_stamp;
    /**
     * 會員類型
     */
    private String memberShipType;
}

5、微信支付API地址 WeChatPayUrlConstants.java

package com.ckm.ball.config.wxpay;
/**
 * 微信支付API地址
 * @author lf
 * @date 2023/8/30
 */
public class WeChatPayUrlConstants {
    /**
     * 統(tǒng)一下單預(yù)下單接口url
     */
    public static final String Uifiedorder = "https://api.mch.weixin.qq.com/pay/unifiedorder";
    /**
     * 訂單狀態(tài)查詢接口URL
     */
    public static final String Orderquery = "https://api.mch.weixin.qq.com/pay/orderquery";
    /**
     * 訂單申請退款
     */
    public static final String Refund = "https://api.mch.weixin.qq.com/secapi/pay/refund";
    /**
     * 付款碼 支付
     */
    public static final String MicroPay = "https://api.mch.weixin.qq.com/pay/micropay";
    /**
     * 微信網(wǎng)頁授權(quán) 獲取“code”請求地址
     */
    public static final String GainCodeUrl = "https://open.weixin.qq.com/connect/oauth2/authorize";
    /**
     * 微信網(wǎng)頁授權(quán) 獲取“code” 回調(diào)地址
     */
    public static final String GainCodeRedirect_uri = "http://i5jmxe.natappfree.cc/boss/WeChatPayMobile/SkipPage.html";
}

6、預(yù)下單成功之后返回結(jié)果 OrderReturnInfo.java

package com.ckm.ball.config.wxpay;
import lombok.Data;
@Data
public class OrderReturnInfo {
    private String return_code;
    private String return_msg;
    private String result_code;
    private String appid;
    private String mch_id;
    private String nonce_str;
    private String sign;
    private String prepay_id;
    private String trade_type;
}

7、查詢訂單返回的實體類 QueryReturnInfo.java

package com.ckm.ball.config.wxpay;
import lombok.Data;
/**
 * 查詢訂單返回實體類
 * @author lf
 * @date 2023/9/1
 */
@Data
public class QueryReturnInfo {
    private String return_code;
    private String return_msg;
    private String result_code;
    private String err_code;
    private String err_code_des;
    private String appid;
    private String mch_id;
    private String nonce_str;
    private String sign;
    private String prepay_id;
    private String trade_type;
    private String device_info;
    private String openid;
    private String is_subscribe;
    private String trade_state;
    private String bank_type;
    private int total_fee;
    private int settlement_total_fee;
    private String fee_type;
    private int cash_fee;
    private String cash_fee_type;
    private int coupon_fee;
    private int coupon_count;
    private String coupon_type_$n;
    private String coupon_id_$n;
    private String transaction_id;
    private String out_trade_no;
    private String time_end;
    private String trade_state_desc;
}

8、簽名實體類 SignInfo.java

package com.ckm.ball.config.wxpay;
import com.thoughtworks.xstream.annotations.XStreamAlias;
import lombok.Data;
/**
 * 簽名實體類
 * @author lf
 * @date 2023/9/1
 */
@Data
public class SignInfo {
    private String appId;//小程序ID
    private String timeStamp;//時間戳
    private String nonceStr;//隨機串
    @XStreamAlias("package")
    private String repay_id;
    private String signType;//簽名方式
    public String getAppId() {
        return appId;
    }
    public void setAppId(String appId) {
        this.appId = appId;
    }
    public String getTimeStamp() {
        return timeStamp;
    }
    public void setTimeStamp(String timeStamp) {
        this.timeStamp = timeStamp;
    }
    public String getNonceStr() {
        return nonceStr;
    }
    public void setNonceStr(String nonceStr) {
        this.nonceStr = nonceStr;
    }
    public String getRepay_id() {
        return repay_id;
    }
    public void setRepay_id(String repay_id) {
        this.repay_id = repay_id;
    }
    public String getSignType() {
        return signType;
    }
    public void setSignType(String signType) {
        this.signType = signType;
    }
}

9、Http工具類 HttpRequest.java

package com.ckm.ball.utils;
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.io.xml.DomDriver;
import com.thoughtworks.xstream.io.xml.XmlFriendlyNameCoder;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import javax.net.ssl.X509TrustManager;
import java.io.IOException;
import java.security.KeyManagementException;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.UnrecoverableKeyException;
import java.security.cert.CertificateException;
/**
 * Http工具類
 * @author lf
 * @date 2023/9/1
 */
public class HttpRequest {
    //連接超時時間，默認10秒
    private static final int socketTimeout = 10000;
    //傳輸超時時間，默認30秒
    private static final int connectTimeout = 30000;
    /**
     * post請求
     *
     * @throws IOException
     * @throws ClientProtocolException
     * @throws NoSuchAlgorithmException
     * @throws KeyStoreException
     * @throws KeyManagementException
     * @throws UnrecoverableKeyException
     */
    public static String sendPost(String url, Object xmlObj) throws ClientProtocolException, IOException, UnrecoverableKeyException, KeyManagementException, KeyStoreException, NoSuchAlgorithmException {
        HttpPost httpPost = new HttpPost(url);
        //解決XStream對出現(xiàn)雙下劃線的bug
        XStream xStreamForRequestPostData = new XStream(new DomDriver("UTF-8", new XmlFriendlyNameCoder("-_", "_")));
        xStreamForRequestPostData.alias("xml", xmlObj.getClass());
        //將要提交給API的數(shù)據(jù)對象轉(zhuǎn)換成XML格式數(shù)據(jù)Post給API
        String postDataXML = xStreamForRequestPostData.toXML(xmlObj);
        //得指明使用UTF-8編碼，否則到API服務(wù)器XML的中文不能被成功識別
        StringEntity postEntity = new StringEntity(postDataXML, "UTF-8");
        httpPost.addHeader("Content-Type", "text/xml");
        httpPost.setEntity(postEntity);
        //設(shè)置請求器的配置
        RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(socketTimeout).setConnectTimeout(connectTimeout).build();
        httpPost.setConfig(requestConfig);
        HttpClient httpClient = HttpClients.createDefault();
        HttpResponse response = httpClient.execute(httpPost);
        HttpEntity entity = response.getEntity();
        String result = EntityUtils.toString(entity, "UTF-8");
        return result;
    }
    /**
     * 自定義證書管理器，信任所有證書
     *
     * @author pc
     */
    public static class MyX509TrustManager implements X509TrustManager {
        @Override
        public void checkClientTrusted(
                java.security.cert.X509Certificate[] arg0, String arg1)
                throws CertificateException {
        }
        @Override
        public void checkServerTrusted(
                java.security.cert.X509Certificate[] arg0, String arg1)
                throws CertificateException {
        }
        @Override
        public java.security.cert.X509Certificate[] getAcceptedIssuers() {
            return null;
        }
    }
}

10、微信簽名 SignUtils.java

package com.ckm.ball.config.wxpay;
import com.ckm.ball.utils.MD5;
import com.thoughtworks.xstream.annotations.XStreamAlias;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Map;
/**
 * 微信簽名
 * @author lf
 * @date 2023/9/1
 */
public class SignUtils {
    /**
     * 簽名算法
     *
     * @param o 要參與簽名的數(shù)據(jù)對象
     * @return 簽名
     * @throws IllegalAccessException
     */
    public static String getSign(Object o,String key) throws IllegalAccessException {
        ArrayList<String> list = new ArrayList<String>();
        Class cls = o.getClass();
        Field[] fields = cls.getDeclaredFields();
        for (Field f : fields) {
            f.setAccessible(true);
            if (f.get(o) != null && f.get(o) != "") {
                String name = f.getName();
                XStreamAlias anno = f.getAnnotation(XStreamAlias.class);
                if (anno != null) {
                    name = anno.value();
                }
                list.add(name + "=" + f.get(o) + "&");
            }
        }
        int size = list.size();
        String[] arrayToSort = list.toArray(new String[size]);
        Arrays.sort(arrayToSort, String.CASE_INSENSITIVE_ORDER);
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < size; i++) {
            sb.append(arrayToSort[i]);
        }
        String result = sb.toString();
        result += "key=" + key;
        System.out.println("簽名數(shù)據(jù)：" + result);
        result = MD5.MD5Encode(result).toUpperCase();
        return result;
    }
    public static String getSign(Map<String, Object> map,String key) {
        ArrayList<String> list = new ArrayList<String>();
        for (Map.Entry<String, Object> entry : map.entrySet()) {
            if (entry.getValue() != "") {
                list.add(entry.getKey() + "=" + entry.getValue() + "&");
            }
        }
        int size = list.size();
        String[] arrayToSort = list.toArray(new String[size]);
        Arrays.sort(arrayToSort, String.CASE_INSENSITIVE_ORDER);
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < size; i++) {
            sb.append(arrayToSort[i]);
        }
        String result = sb.toString();
        result += "key=" + key;
        //Util.log("Sign Before MD5:" + result);
        result = MD5.MD5Encode(result).toUpperCase();
        //Util.log("Sign Result:" + result);
        return result;
    }
}

11、MD5加密工具類 MD5.java

package com.ckm.ball.utils;
import java.security.MessageDigest;
/**
 * MD5加密工具類
 * @author lf
 * @date 2023/9/1
 */
public class MD5 {
    private final static String[] hexDigits = {"0", "1", "2", "3", "4", "5", "6", "7",
            "8", "9", "a", "b", "c", "d", "e", "f"};
    /**
     * 轉(zhuǎn)換字節(jié)數(shù)組為16進制字串
     *
     * @param b 字節(jié)數(shù)組
     * @return 16進制字串
     */
    public static String byteArrayToHexString(byte[] b) {
        StringBuilder resultSb = new StringBuilder();
        for (byte aB : b) {
            resultSb.append(byteToHexString(aB));
        }
        return resultSb.toString();
    }
    /**
     * 轉(zhuǎn)換byte到16進制
     *
     * @param b 要轉(zhuǎn)換的byte
     * @return 16進制格式
     */
    private static String byteToHexString(byte b) {
        int n = b;
        if (n < 0) {
            n = 256 + n;
        }
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigits[d1] + hexDigits[d2];
    }
    /**
     * MD5編碼
     *
     * @param origin 原始字符串
     * @return 經(jīng)過MD5加密之后的結(jié)果
     */
    public static String MD5Encode(String origin) {
        String resultString = null;
        try {
            resultString = origin;
            MessageDigest md = MessageDigest.getInstance("MD5");
            resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return resultString;
    }
}

12、微信支付service接口 WxPayInfoService.java

package com.ckm.ball.config.wxpay;
import java.util.Map;
/**
 * 微信小程序支付-業(yè)務(wù)接口層
 * @author lf
 * @date 2023/8/31
 */
public interface WxPayInfoService {
    /**
     * 插入訂單記錄
     */
    Map<String, Object> insertPayRecord();
    /**
     * 查詢訂單
     * @param out_trade_no 訂單號
     * @return 返回結(jié)果
     */
    Map<String, Object> orderQuery(String out_trade_no);
}

13、微信支付service接口實現(xiàn)類 WxPayInfoServiceImpl.java

package com.ckm.ball.config.wxpay;
import cn.hutool.core.util.ObjectUtil;
import com.github.wxpay.sdk.WXPayConstants;
import com.github.wxpay.sdk.WXPayUtil;
import com.ckm.ball.utils.HttpRequest;
import com.thoughtworks.xstream.XStream;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import javax.annotation.Resource;
import java.math.BigDecimal;
import java.text.DecimalFormat;
import java.util.*;
/**
 * 微信小程序支付-業(yè)務(wù)接口實現(xiàn)層
 * @author lf
 * @date 2023/8/31
 */
@Service
@Slf4j
public class WxPayInfoServiceImpl implements WxPayInfoService {
    @Resource
    private WxPayConfig payProperties;
    private static final DecimalFormat df = new DecimalFormat("#");
    /**
     * 插入訂單記錄
     * @param payParameterVO 用戶ID 會員套餐ID
     * @return 返回結(jié)果
     */
    @Override
    @Transactional
    public Map<String, Object> insertPayRecord() {
        //接收返回的參數(shù)
        Map<String, Object> map = new HashMap<>();
        String title = "ckm";
        //金額 * 100 以分為單位
        BigDecimal fee = BigDecimal.valueOf(1);
        BigDecimal RMB = new BigDecimal(100);
        BigDecimal totalFee = fee.multiply(RMB);
        try {
            WeChatPay weChatPay = new WeChatPay();
            weChatPay.setAppid(payProperties.getAppId());
            weChatPay.setMch_id(payProperties.getMchId());
            weChatPay.setNonce_str(getRandomStringByLength(32));
            weChatPay.setBody(title);
            weChatPay.setOut_trade_no(getRandomStringByLength(32));
            weChatPay.setTotal_fee( df.format(Double.parseDouble(String.valueOf(totalFee))));
            weChatPay.setSpbill_create_ip("58.213.48.98");
            weChatPay.setNotify_url(payProperties.getNotifyUrl());
            weChatPay.setTrade_type("JSAPI");
            //這里直接使用當(dāng)前用戶的openid
            weChatPay.setOpenid("o_qV97S-4HaPN51ZbQe4qML625j4");
//            weChatPay.setSign_type("MD5");
            //生成簽名
            String sign = SignUtils.getSign(weChatPay,payProperties.getApiKey());
            System.out.println(sign);
            weChatPay.setSign(sign);
            String result = HttpRequest.sendPost(WeChatPayUrlConstants.Uifiedorder, weChatPay);
            System.out.println(result);
            //將返回結(jié)果從xml格式轉(zhuǎn)換為map格式
            Map<String, String> wxResultMap = WXPayUtil.xmlToMap(result);
            if (ObjectUtil.isNotEmpty(wxResultMap.get("return_code")) && wxResultMap.get("return_code").equals("SUCCESS")){
                if (wxResultMap.get("result_code").equals("FAIL")){
                    map.put("msg", "統(tǒng)一下單失敗");
                    map.put("status",500);
                    map.put("data", wxResultMap.get("err_code_des"));
                    return map;
                }
            }
            XStream xStream = new XStream();
            // 允許特定類的反序列化
            xStream.allowTypes(new Class[] { OrderReturnInfo.class });
            // 設(shè)置別名
            xStream.alias("xml", OrderReturnInfo.class);
            // 從XML反序列化
            OrderReturnInfo returnInfo = (OrderReturnInfo) xStream.fromXML(result);
            // 二次簽名
            if ("SUCCESS".equals(returnInfo.getReturn_code()) && returnInfo.getReturn_code().equals(returnInfo.getResult_code())) {
                SignInfo signInfo = new SignInfo();
                signInfo.setAppId(payProperties.getAppId());
                long time = System.currentTimeMillis() / 1000;
                signInfo.setTimeStamp(String.valueOf(time));
                signInfo.setNonceStr(WXPayUtil.generateNonceStr());
                signInfo.setRepay_id("prepay_id=" + returnInfo.getPrepay_id());
                signInfo.setSignType("MD5");
                //生成簽名
                String sign1 = SignUtils.getSign(signInfo,payProperties.getApiKey());
                Map<String, String> payInfo = new HashMap<>();
                payInfo.put("timeStamp", signInfo.getTimeStamp());
                payInfo.put("nonceStr", signInfo.getNonceStr());
                payInfo.put("package", signInfo.getRepay_id());
                payInfo.put("signType", signInfo.getSignType());
                payInfo.put("paySign", sign1);
                map.put("status", 200);
                map.put("msg", "統(tǒng)一下單成功!");
                map.put("data", payInfo);
                //預(yù)下單成功，處理業(yè)務(wù)邏輯
                //****************************//
                // 業(yè)務(wù)邏輯結(jié)束 回傳給小程序端喚起支付
                return map;
            }
            map.put("status", 500);
            map.put("msg", "統(tǒng)一下單失敗!");
            map.put("data", null);
            return map;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
    /**
     * 查詢訂單
     * @param out_trade_no 訂單號
     * @return 返回結(jié)果
     */
    @Override
    public Map<String, Object> orderQuery(String out_trade_no){
        Map<String, Object> map = new HashMap<>();
        try {
            WeChatPay weChatPay = new WeChatPay();
            weChatPay.setAppid(payProperties.getAppId());
            weChatPay.setMch_id(payProperties.getMchId());
            weChatPay.setNonce_str(WXPayUtil.generateNonceStr());
            weChatPay.setOut_trade_no(out_trade_no);
            //order.setSign_type("MD5");
            //生成簽名
            String sign = SignUtils.getSign(weChatPay,payProperties.getApiKey());
            weChatPay.setSign(sign);
            String result = HttpRequest.sendPost(WXPayConstants.ORDERQUERY_URL, weChatPay);
            System.out.println(result);
            XStream xStream = new XStream();
            xStream.alias("xml", QueryReturnInfo.class);
            QueryReturnInfo returnInfo = (QueryReturnInfo) xStream.fromXML(result);
            map.put("status", 500);
            map.put("msg", "統(tǒng)一下單失敗!");
            map.put("data", returnInfo);
            return map;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
    /**
     * 獲取一定長度的隨機字符串
     *
     * @param length 指定字符串長度
     * @return 一定長度的字符串
     */
    public static String getRandomStringByLength(int length) {
        String base = "abcdefghijklmnopqrstuvwxyz0123456789";
        Random random = new Random();
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < length; i++) {
            int number = random.nextInt(base.length());
            sb.append(base.charAt(number));
        }
        return sb.toString();
    }
}

14、微信支付Controller層 WeChatPayController.java

package com.ckm.ball.config.wxpay;
import com.ckm.ball.utils.StreamUtils;
import com.github.wxpay.sdk.WXPayUtil;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.web.bind.annotation.*;
import javax.annotation.Resource;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.HashMap;
import java.util.Map;
@RestController
@RequestMapping("/ballFishing/wechat")
@Api(value = "微信支付接口")
@CrossOrigin    // @CrossOrigin注解 解決uniapp跨域訪問后端問題。
public class WeChatPayController {
    @Resource
    private WxPayInfoService wxPayInfoService;
    /**
     * 小程序支付下單接口
     * @return 返回結(jié)果
     */
    @ApiOperation("小程序支付功能")
    @PostMapping("/pay")
    public Map<String,Object> wxPay(){
        return wxPayInfoService.insertPayRecord();
    }
    /**
     * 查詢訂單
     */
    @ApiOperation("訂單查詢")
    @PostMapping("/wx/query")
    public Map<String, Object> orderQuery(@RequestParam("out_trade_no") String out_trade_no) {
        return wxPayInfoService.orderQuery(out_trade_no);
    }
    /**
     * 微信小程序支付成功回調(diào)
     * @param request 請求
     * @param response 響應(yīng)
     * @return 返回結(jié)果
     * @throws Exception 異常處理
     */
    @RequestMapping("/weixin/callback")
    public String callBack(HttpServletRequest request, HttpServletResponse response) throws Exception {
        System.out.println("接口已被調(diào)用");
        ServletInputStream inputStream = request.getInputStream();
        String notifyXml = StreamUtils.inputStream2String(inputStream, "utf-8");
        System.out.println(notifyXml);
        // 解析返回結(jié)果
        Map<String, String> notifyMap = WXPayUtil.xmlToMap(notifyXml);
        // 判斷支付是否成功
        if ("SUCCESS".equals(notifyMap.get("result_code"))) {
            //支付成功時候，處理業(yè)務(wù)邏輯
            System.out.println("支付成功");
            System.out.println("<xml>" + "<return_code><![CDATA[SUCCESS]]></return_code>"
                    + "<return_msg><![CDATA[OK]]></return_msg>" + "</xml> ");
            /**
             * 注意
             * 因為微信回調(diào)會有八次之多,所以當(dāng)?shù)谝淮位卣{(diào)成功了,那么我們就不再執(zhí)行邏輯了
             * return返回的結(jié)果一定是這種格式，當(dāng)result_code返回的結(jié)果是SUCCESS時，則不進行調(diào)用了
             * 如果不返回下面的格式，業(yè)務(wù)邏輯會出現(xiàn)回調(diào)多次的情況，我就遇到過這種情況。
             */
            return "<xml>" + "<return_code><![CDATA[SUCCESS]]></return_code>"
                    + "<return_msg><![CDATA[OK]]></return_msg>" + "</xml> ";
        }
        // 創(chuàng)建響應(yīng)對象：微信接收到校驗失敗的結(jié)果后，會反復(fù)的調(diào)用當(dāng)前回調(diào)函數(shù)
        Map<String, String> returnMap = new HashMap<>();
        returnMap.put("return_code", "FAIL");
        returnMap.put("return_msg", "");
        String returnXml = WXPayUtil.mapToXml(returnMap);
        response.setContentType("text/xml");
        System.out.println("校驗失敗");
        return returnXml;
    }
}

簽名失敗

如果出現(xiàn)簽名錯誤，請檢查后再試。去重置秘鑰：微信商戶平臺(pay.weixin.qq.com)–>賬戶設(shè)置–>API安全–>密鑰設(shè)置