小程式開發呼叫微信支付以及微信回撥地址設定

wx.open.app_id=使用者的appid
wx.open.app_secret=這是做登陸用的
weixin.pay.partner=商戶號
wexxin.pay.partenerkey=商戶號祕鑰

@Component
//@PropertySource("classpath:application.properties")
public class ConstantPropertiesUtil implements InitializingBean {
    //讀取組態檔並賦值
    @Value("${wx.open.app_id}")
    private String appId;
    @Value("${wx.open.app_secret}")
    private String appSecret;
    @Value("{weixin.pay.partner}")
    private String partner;
    @Value("{wexxin.pay.partenerkey}")
    private String partenerkey;
 
    public static String WX_OPEN_APP_ID;
    public static String WX_OPEN_APP_SECRET;
    public static String PARTNER;
    public static String PARTNERKET;
 
    @Override
    public void afterPropertiesSet() throws Exception {
        WX_OPEN_APP_ID = appId;
        WX_OPEN_APP_SECRET = appSecret;
        PARTNER = partner;
        PARTNERKET = partenerkey;
    }
}

     @Autowired
    private WXService wxService;
    @GetMapping("pay")
    public R creatNative(Integer orderid){
        try {
            Map map = wxService.payment(orderid);
            return R.ok().data(map);
        } catch (UnsupportedEncodingException e) {
           return R.error().message("支付失敗");
        }
    }

 
@Service
public class WXServiceImpl implements WXService {
    @Autowired
    private OrderService orderService;
    @Override
    public Map payment(Integer orderid) throws UnsupportedEncodingException {
        //封裝傳遞微信地址引數
        Map paramMap = new HashMap();
        paramMap.put("appid", ConstantPropertiesUtil.WX_OPEN_APP_ID); //公眾號id
        paramMap.put("mch_id", ConstantPropertiesUtil.PARTNER); //商戶號
        paramMap.put("nonce_str", WXPayUtil.generateNonceStr()); //隨機字串，呼叫工具類
        paramMap.put("out_trade_no", orderid); //訂單流水號
        Order order = orderService.getById(orderid);
        paramMap.put("total_fee", order.getPayment()); //金額
        paramMap.put("spbill_create_ip", "127.0.0.1");  //終端ip
        paramMap.put("notify_url", "http://XXXXX/weixin/callBack");//回撥地址
 
        paramMap.put("body",order.getProductname());  //商品名稱
        paramMap.put("timeStamp", WXUtil.getCurrentTimestamp()+"");//獲取當前時間戳，單位秒
        String sign = WXUtil.genSignature(ConstantPropertiesUtil.PARTNERKET,paramMap);    //sing
        paramMap.put("sign", sign);  //簽名
        return paramMap;
    }
}

 
public class WXUtil {
 
    public static String genSignature(String secretKey, Map<String, String> params) throws UnsupportedEncodingException {
        if (secretKey == null || params == null || params.size() == 0) {
            return "";
        }
        // 1. 引數名按照ASCII碼錶升序排序
        String[] keys = params.keySet().toArray(new String[0]);
        Arrays.sort(keys);
        // 2. 按照排序拼接引數名與引數值
        StringBuffer paramBuffer = new StringBuffer();
        for (String key : keys) {
            paramBuffer.append("&"+key).append(params.get(key) == null ? "" : "="+params.get(key));
        }
        // 3. 將secretKey拼接到最後
        paramBuffer=paramBuffer.append("&key="+secretKey);
        String pa =paramBuffer.substring(1);
        // 4. MD5是128位元長度的摘要演演算法，用16進位製表示，一個十六進位制的字元能表示4個位，所以簽名後的字串長度固定為32個十六進位制字元。
        return DigestUtils.md5Hex(pa.getBytes("UTF-8")).toUpperCase();
    }
    /**
     * 獲取當前時間戳，單位秒
     * @return
     */
    public static long getCurrentTimestamp() {
        return System.currentTimeMillis()/1000;
    }
 
    /**
     * 獲取當前時間戳，單位毫秒
     * @return
     */
    public static long getCurrentTimestampMs() {
        return System.currentTimeMillis();
    }
 
}

 //回撥介面
    @RequestMapping("callBack")
    public String callBack(HttpServletRequest request, HttpServletResponse response) throws Exception{
        System.out.println("介面已被呼叫");
        ServletInputStream inputStream = request.getInputStream();
        String notifyXml = StreamUtils.inputStream2String(inputStream, "utf-8");
        System.out.println(notifyXml);
       
          // 解析返回結果
            Map<String, String> notifyMap = WXPayUtil.xmlToMap(notifyXml);
            // 判斷支付是否成功
            if ("SUCCESS".equals(notifyMap.get("result_code"))) {
                   //編寫自己的實現邏輯
                    // 支付成功：給微信傳送我已接收通知的響應
                    // 建立響應物件
                    Map<String, String> returnMap = new HashMap<>();
                    returnMap.put("return_code", "SUCCESS");
                    returnMap.put("return_msg", "OK");
                    String returnXml = WXPayUtil.mapToXml(returnMap);
                    response.setContentType("text/xml");
                    System.out.println("支付成功");
                    return returnXml;
                }
         
        }
 
        // 建立響應物件：微信接收到校驗失敗的結果後，會反覆的呼叫當前回撥函數
        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;
 
    }

public class StreamUtils {
    private static int _buffer_size = 1024;
    /**
     * InputStream流轉換成String字串
     * @param inStream InputStream流
     * @param encoding 編碼格式
     * @return String字串
     */
    public static String inputStream2String(InputStream inStream, String encoding){
        String result = null;
        ByteArrayOutputStream outStream = null;
        try {
            if(inStream != null){
                outStream = new ByteArrayOutputStream();
                byte[] tempBytes = new byte[_buffer_size];
                int count = -1;
                while((count = inStream.read(tempBytes, 0, _buffer_size)) != -1){
                    outStream.write(tempBytes, 0, count);
                }
                tempBytes = null;
                outStream.flush();
                result = new String(outStream.toByteArray(), encoding);
                outStream.close();
            }
        } catch (Exception e) {
            result = null;
        } finally {
            try {
                if(inStream != null) {
                    inStream.close();
                    inStream = null;
                }
                if(outStream != null) {
                    outStream.close();
                    outStream = null;
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return result;
    }
}