Java微信APP支付-統一下單

阿新 • • 發佈：2019-01-07

最近因為公司的業務需要，需要自主開發一套類似淘寶、京東的購物APP系統，本人負責後端線上支付模組介面的開發，主要包含微信、支付寶的統一下單、支付結果通知、申請退款、退款結果通知等介面的開發。費話不多說，我們這一章主要講述微信APP支付的統一下單介面的開發。

這裡我們先講述一下總體流程

商戶系統和微信支付系統主要互動說明：

步驟1：使用者在商戶APP中選擇商品，提交訂單，選擇微信支付。

步驟2：商戶後臺收到使用者支付單，呼叫微信支付統一下單介面。參見【統一下單API】。

步驟3：統一下單介面返回正常的prepay_id，再按簽名規範重新生成簽名後，將資料傳輸給APP。參與簽名的欄位名為appid，partnerid，prepayid，noncestr，timestamp，package。注意：package的值格式為Sign=WXPay

步驟4：商戶APP調起微信支付。api參見本章節【app端開發步驟說明】

步驟5：商戶後臺接收支付通知。api參見【支付結果通知API】

步驟6：商戶後臺查詢支付結果。api參見【查詢訂單API】

1、應用場景

商戶系統先呼叫該介面在微信支付服務後臺生成預支付交易單，返回正確的預支付交易會話標識後再在APP裡面調起支付。

2、介面連結

URL地址：https://api.mch.weixin.qq.com/pay/unifiedorder

3、是否需要證書

不需要

4、請求引數

此處列出必要的引數，如需要檢視詳細引數，請查閱官方API。

欄位名	變數名	必填	型別	示例值	描述
應用ID	appid	是	String(32)	wxd678efh567hg6787	微信開放平臺稽核通過的應用APPID（請登入open.weixin.qq.com檢視，注意與公眾號的APPID不同）
商戶號	mch_id	是	String(32)	1230000109	微信支付分配的商戶號
隨機字串	nonce_str	是	String(32)	5K8264ILTKCH16CQ2502SI8ZNMTM67VS	隨機字串，不長於32位。推薦隨機數生成演算法
簽名	sign	是	String(32)	C380BEC2BFD727A4B6845133519F3AD6
商品描述	body	是	String(128)	騰訊充值中心-QQ會員充值	商品描述交易欄位格式根據不同的應用場景按照以下格式： APP——需傳入應用市場上的APP名字-實際商品名稱，天天愛消除-遊戲充值。
商戶訂單號	out_trade_no	是	String(32)	20150806125346	商戶系統內部訂單號，要求32個字元內，只能是數字、大小寫字母_-\|*且在同一個商戶號下唯一。詳見商戶訂單號
總金額	total_fee	是	Int	888	訂單總金額，單位為分，詳見支付金額
終端IP	spbill_create_ip	是	String(16)	123.12.12.123	使用者端實際ip
通知地址	notify_url	是	String(256)	http://www.weixin.qq.com/wxpay/pay.php	接收微信支付非同步通知回撥地址，通知url必須為直接可訪問的url，不能攜帶引數。
交易型別	trade_type	是	String(16)	APP	支付型別

5、程式碼實現

5.1基礎類

WeChatConfig配置類，主要包含微信的配置資訊

package com.hisap.xql.api.common.wechat;

/**
 * @Author: QijieLiu
 * @Description: 微信配置資訊
 * @Date: Created in 16:47 2018/8/14
 */
public class WeChatConfig {
	 public static String APP_ID = "xxxxxx";
	 public static String MCH_ID = "xxxxxx";
	 public static String MCH_KEY = "xxxxxx";
	 public static String APP_SECRET = "xxxxxx";
	 public static String UNIFIEDORDER_URL = "https://api.mch.weixin.qq.com/pay/unifiedorder";
	 public static String NOTIFY_URL = "http://xxx.xxx.xxx.xxx:8080/XqlApi/wechatpay/paynotify";
	 public static String REFUND_URL = "https://api.mch.weixin.qq.com/secapi/pay/refund";
	 public static String REFUND_NOTIFY_URL = "http://xxx.xxx.xxx.xxx:8080/XqlApi/wechatpay/refundnotify";
	 public static String TRADE_TYPE = "APP";
	 public static String CERT_URL="E:\\cert\\apiclient_cert.p12";
}

ResponseJson基礎類，主要與APP前端進行互動

package com.hisap.xql.api.common.bean;

public class ResponseJson {
	// 結果碼
	private String code;
	// 結果說明
	private String message;
	// 內容
	private Object data;

	public String getCode() {
		return code;
	}

	public void setCode(String code) {
		this.code = code;
	}

	public String getMessage() {
		return message;
	}

	public void setMessage(String message) {
		this.message = message;
	}

	public Object getData() {
		return data;
	}

	public void setData(Object data) {
		this.data = data;
	}

}

5.2工具類

MD5Utils類

package com.hisap.xql.api.common.utils;

import java.security.MessageDigest;

/**
 * @Author: QijieLiu
 * @Description: MD5加密工具
 * @Date: Created in 09:39 2018/8/17
 */
public class MD5Utils {
	 
	public final static String MD5(String s) {
		char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
		try {
			byte[] btInput = s.getBytes();
			// 獲得MD5摘要演算法的 MessageDigest 物件
			MessageDigest mdInst = MessageDigest.getInstance("MD5");
			// 使用指定的位元組更新摘要
			mdInst.update(btInput);
			// 獲得密文
			byte[] md = mdInst.digest();
			// 把密文轉換成十六進位制的字串形式
			int j = md.length;
			char str[] = new char[j * 2];
			int k = 0;
			for (int i = 0; i < j; i++) {
				byte byte0 = md[i];
				str[k++] = hexDigits[byte0 >>> 4 & 0xf];
				str[k++] = hexDigits[byte0 & 0xf];
			}
			return new String(str);
		}
		catch (Exception e) {
			e.printStackTrace();
			return null;
		}
	}
 
	private static String byteArrayToHexString(byte b[]) {
		StringBuffer resultSb = new StringBuffer();
		for (int i = 0; i < b.length; i++)
			resultSb.append(byteToHexString(b[i]));
 
		return resultSb.toString();
	}
 
	private static String byteToHexString(byte b) {
		int n = b;
		if (n < 0)
			n += 256;
		int d1 = n / 16;
		int d2 = n % 16;
		return hexDigits[d1] + hexDigits[d2];
	}
 
	public static String MD5Encode(String origin, String charsetname) {
		String resultString = null;
		try {
			resultString = new String(origin);
			MessageDigest md = MessageDigest.getInstance("MD5");
			if (charsetname == null || "".equals(charsetname))
				resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
			else
				resultString = byteArrayToHexString(md.digest(resultString.getBytes(charsetname)));
		}
		catch (Exception exception) {
		}
		return resultString;
	}
 
	private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
 
	public static void main(String[] asd) {
		String con = "hello kitty";
		String str = MD5Encode(con, "UTF-8");
		System.out.println(str.toUpperCase());
	}
}

DateUtil類

package com.hisap.xql.api.common.utils;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class DateUtil {
	
	public static final String DF_STANDARD = "yyyy-MM-dd HH:mm:ss";
	
	public static final String DF_DATE = "yyyy-MM-dd";

	/**
	 * 時間戳轉換成日期格式字串
	 * @param seconds 精確到毫秒的字串
	 * @param formatStr
	 * @return
	 */
	public static String timeStamp2Date(String miniSeconds, String format) {
		if (miniSeconds == null || miniSeconds.isEmpty() || miniSeconds.equals("null")) {
			return null;
		}
		if (format == null || format.isEmpty()) {
			format = "yyyy-MM-dd HH:mm:ss";
		}
		SimpleDateFormat sdf = new SimpleDateFormat(format);
		return sdf.format(new Date(Long.valueOf(miniSeconds)));
	}

	/**
	 * 獲取精確到秒的時間戳
	 * @param date
	 * @return
	 */
	public static Integer getSecondTimestamp(Date date) {
		if (null == date) {
			return 0;
		}
		String timestamp = String.valueOf(date.getTime() / 1000);
		return Integer.valueOf(timestamp);
	}

	/**
	 * 字串轉時間
	 * @param date
	 * @param dateFormat
	 * @return
	 */
	public static Date stringToDate(String date, String dateFormat) {
        SimpleDateFormat formatDate = new SimpleDateFormat(dateFormat);
        try {
            return formatDate.parse(date);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return null;
    }
	
	/**
	 * 日期轉字串
	 * @param date
	 * @param dateFormat
	 * @return
	 */
	public static String dateToString(Date date, String dateFormat) {
        SimpleDateFormat formatDate = new SimpleDateFormat(dateFormat);
        return formatDate.format(date);
    }
	
	/**
	 * 驗證時間合法性
	 * @param date
	 * @param dateFormat
	 * @return
	 */
	public static boolean isValidDateTime(String date, String dateFormat) {
		boolean convertSuccess = true;
		SimpleDateFormat formatDate = new SimpleDateFormat(dateFormat);
        try {
        	// 設定lenient為false. 否則SimpleDateFormat會比較寬鬆地驗證日期，比如2007/02/29會被接受，並轉換成2007/03/01
        	formatDate.setLenient(false);
            formatDate.parse(date);
        } catch (Exception e) {
        	convertSuccess = false;
        }
        return convertSuccess;
	}
	
	/**
	 * 獲取幾天前的時間
	 * @param d
	 * @param day
	 * @return
	 */
	public static Date getDateBefore(Date d, int day) {
		Calendar now = Calendar.getInstance();
		now.setTime(d);
		now.set(Calendar.DATE, now.get(Calendar.DATE) - day);
		return now.getTime();
	}

	/**
	 * 獲取幾天後的時間
	 * 
	 * @param d
	 * @param day
	 * @return
	 */
	public static Date getDateAfter(Date d, int day) {
		Calendar now = Calendar.getInstance();
		now.setTime(d);
		now.set(Calendar.DATE, now.get(Calendar.DATE) + day);
		return now.getTime();
	}
}

CommonUtil類

package com.hisap.xql.api.common.wechat;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.ConnectException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.security.KeyStore;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.Set;
import java.util.SortedMap;
import java.util.TreeMap;

import javax.net.ssl.SSLContext;

import org.apache.http.Consts;
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.ssl.SSLContexts;
import org.apache.http.util.EntityUtils;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;

import com.hisap.xql.api.common.utils.MD5Utils;

/**
 * @Author: QijieLiu
 * @Description: 微信支付工具類
 * @Date: Created in 19:39 2018/8/21
 */
public class CommonUtil {
	// 微信引數配置
	public static String API_KEY = WeChatConfig.MCH_KEY;

	// 隨機字串生成
	public static String getRandomString(int length) { // length表示生成字串的長度
		String base = "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
		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();
	}

	// 請求xml組裝
	public static String getRequestXml(SortedMap<String, Object> parameters) {
		StringBuffer sb = new StringBuffer();
		sb.append("<xml>");
		Set es = parameters.entrySet();
		Iterator it = es.iterator();
		while (it.hasNext()) {
			Map.Entry entry = (Map.Entry) it.next();
			String key = (String) entry.getKey();
			String value = entry.getValue().toString();
			if ("attach".equalsIgnoreCase(key) || "body".equalsIgnoreCase(key)
					|| "sign".equalsIgnoreCase(key)) {
				sb.append("<" + key + ">" + "<![CDATA[" + value + "]]></" + key
						+ ">");
			} else {
				sb.append("<" + key + ">" + value + "</" + key + ">");
			}
		}
		sb.append("</xml>");
		return sb.toString();
	}

	// 生成簽名
	public static String createSign(String characterEncoding,
			SortedMap<String, Object> parameters) {
		StringBuffer sb = new StringBuffer();
		Set es = parameters.entrySet();
		Iterator it = es.iterator();
		while (it.hasNext()) {
			Map.Entry entry = (Map.Entry) it.next();
			String k = (String) entry.getKey();
			Object v = entry.getValue();
			if (null != v && !"".equals(v) && !"sign".equals(k)
					&& !"key".equals(k)) {
				sb.append(k + "=" + v + "&");
			}
		}
		sb.append("key=" + API_KEY);
		System.out.println(sb.toString());
		String sign = MD5Utils.MD5Encode(sb.toString(), characterEncoding)
				.toUpperCase();
		return sign;
	}

	/**
	 * 驗證回撥簽名
	 * 
	 * @param packageParams
	 * @param key
	 * @param charset
	 * @return
	 */
	public static boolean isTenpaySign(Map<String, String> map) throws UnsupportedEncodingException {
		String charset = "utf-8";
		String signFromAPIResponse = map.get("sign");
		if (signFromAPIResponse == null || signFromAPIResponse.equals("")) {
			System.out.println("API返回的資料簽名資料不存在，有可能被第三方篡改!!!");
			return false;
		}
		System.out.println("伺服器回包裡面的簽名是:" + signFromAPIResponse);
		// 過濾空 設定 TreeMap
		SortedMap<String, String> packageParams = new TreeMap<>();
		for (String parameter : map.keySet()) {
			String parameterValue = map.get(parameter);
			String v = "";
			if (null != parameterValue) {
				v = parameterValue.trim();
			}
			packageParams.put(parameter, v);
		}

		StringBuffer sb = new StringBuffer();
		Set es = packageParams.entrySet();
		Iterator it = es.iterator();
		while (it.hasNext()) {
			Map.Entry entry = (Map.Entry) it.next();
			String k = (String) entry.getKey();
			String v = (String) entry.getValue();
			if (!"sign".equals(k) && null != v && !"".equals(v)) {
				sb.append(k + "=" + v + "&");
			}
		}
		sb.append("key=" + API_KEY);
		// 將API返回的資料根據用簽名演算法進行計算新的簽名，用來跟API返回的簽名進行比較

		// 算出簽名
		String resultSign = "";
		String tobesign = sb.toString();
		if (null == charset || "".equals(charset)) {
			resultSign = MD5Utils.MD5Encode(tobesign, charset)
					.toUpperCase();
		} else {
			resultSign = MD5Utils.MD5Encode(tobesign, charset)
					.toUpperCase();
		}
		String tenpaySign = ((String) packageParams.get("sign")).toUpperCase();
		return tenpaySign.equals(resultSign);
	}

	// 請求方法
	public static String httpsRequest(String requestUrl, String requestMethod,
			String outputStr) {
		try {

			URL url = new URL(requestUrl);
			HttpURLConnection conn = (HttpURLConnection) url.openConnection();

			conn.setDoOutput(true);
			conn.setDoInput(true);
			conn.setUseCaches(false);
			// 設定請求方式（GET/POST）
			conn.setRequestMethod(requestMethod);
			conn.setRequestProperty("content-type",
					"application/x-www-form-urlencoded");
			// 當outputStr不為null時向輸出流寫資料
			if (null != outputStr) {
				OutputStream outputStream = conn.getOutputStream();
				// 注意編碼格式
				outputStream.write(outputStr.getBytes("UTF-8"));
				outputStream.close();
			}
			// 從輸入流讀取返回內容
			InputStream inputStream = conn.getInputStream();
			InputStreamReader inputStreamReader = new InputStreamReader(
					inputStream, "utf-8");
			BufferedReader bufferedReader = new BufferedReader(
					inputStreamReader);
			String str = null;
			StringBuffer buffer = new StringBuffer();
			while ((str = bufferedReader.readLine()) != null) {
				buffer.append(str);
			}
			// 釋放資源
			bufferedReader.close();
			inputStreamReader.close();
			inputStream.close();
			inputStream = null;
			conn.disconnect();
			return buffer.toString();
		} catch (ConnectException ce) {
			System.out.println("連線超時：{}" + ce);
		} catch (Exception e) {
			System.out.println("https請求異常：{}" + e);
		}
		return null;
	}

	// 退款的請求方法
	public static String httpsRequest2(String requestUrl, String requestMethod,
			String outputStr) throws Exception {
		KeyStore keyStore = KeyStore.getInstance("PKCS12");
		StringBuilder res = new StringBuilder("");
		FileInputStream instream = new FileInputStream(new File(
				"/home/apiclient_cert.p12"));
		try {
			keyStore.load(instream, "".toCharArray());
		} finally {
			instream.close();
		}

		// Trust own CA and all self-signed certs
		SSLContext sslcontext = SSLContexts.custom()
				.loadKeyMaterial(keyStore, "1313329201".toCharArray()).build();
		// Allow TLSv1 protocol only
		SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(
				sslcontext, new String[] { "TLSv1" }, null,
				SSLConnectionSocketFactory.BROWSER_COMPATIBLE_HOSTNAME_VERIFIER);
		CloseableHttpClient httpclient = HttpClients.custom()
				.setSSLSocketFactory(sslsf).build();
		try {

			HttpPost httpost = new HttpPost(
					"https://api.mch.weixin.qq.com/secapi/pay/refund");
			httpost.addHeader("Connection", "keep-alive");
			httpost.addHeader("Accept", "*/*");
			httpost.addHeader("Content-Type",
					"application/x-www-form-urlencoded; charset=UTF-8");
			httpost.addHeader("Host", "api.mch.weixin.qq.com");
			httpost.addHeader("X-Requested-With", "XMLHttpRequest");
			httpost.addHeader("Cache-Control", "max-age=0");
			httpost.addHeader("User-Agent",
					"Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0) ");
			StringEntity entity2 = new StringEntity(outputStr, Consts.UTF_8);
			httpost.setEntity(entity2);
			System.out.println("executing request" + httpost.getRequestLine());

			CloseableHttpResponse response = httpclient.execute(httpost);

			try {
				HttpEntity entity = response.getEntity();

				System.out.println("----------------------------------------");
				System.out.println(response.getStatusLine());
				if (entity != null) {
					System.out.println("Response content length: "
							+ entity.getContentLength());
					BufferedReader bufferedReader = new BufferedReader(
							new InputStreamReader(entity.getContent()));
					String text = "";
					res.append(text);
					while ((text = bufferedReader.readLine()) != null) {
						res.append(text);
						System.out.println(text);
					}

				}
				EntityUtils.consume(entity);
			} finally {
				response.close();
			}
		} finally {
			httpclient.close();
		}
		return res.toString();

	}

	// xml解析
	public static Map doXMLParse(String strxml) throws JDOMException,
			IOException {
		strxml = strxml.replaceFirst("encoding=\".*\"", "encoding=\"UTF-8\"");

		if (null == strxml || "".equals(strxml)) {
			return null;
		}

		Map m = new HashMap();

		InputStream in = new ByteArrayInputStream(strxml.getBytes("UTF-8"));
		SAXBuilder builder = new SAXBuilder();
		Document doc = builder.build(in);
		Element root = doc.getRootElement();
		List list = root.getChildren();
		Iterator it = list.iterator();
		while (it.hasNext()) {
			Element e = (Element) it.next();
			String k = e.getName();
			String v = "";
			List children = e.getChildren();
			if (children.isEmpty()) {
				v = e.getTextNormalize();
			} else {
				v = getChildrenText(children);
			}

			m.put(k, v);
		}

		// 關閉流
		in.close();

		return m;
	}

	public static String getChildrenText(List children) {
		StringBuffer sb = new StringBuffer();
		if (!children.isEmpty()) {
			Iterator it = children.iterator();
			while (it.hasNext()) {
				Element e = (Element) it.next();
				String name = e.getName();
				String value = e.getTextNormalize();
				List list = e.getChildren();
				sb.append("<" + name + ">");
				if (!list.isEmpty()) {
					sb.append(getChildrenText(list));
				}
				sb.append(value);
				sb.append("</" + name + ">");
			}
		}

		return sb.toString();
	}
}

5.3業務類

WeChatPayController類

package com.hisap.xql.api.controller;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.math.BigDecimal;

import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.alibaba.fastjson.JSONObject;
import com.hisap.xql.api.common.bean.ResponseJson;
import com.hisap.xql.api.common.constant.CodeMsg;
import com.hisap.xql.api.common.utils.CommonUtil;
import com.hisap.xql.api.common.utils.WeChatPayCommonUtil;
import com.hisap.xql.api.common.wechat.WeChatNotifyResult;
import com.hisap.xql.api.service.WeChatPayService;


/**
 * @Author: QijieLiu
 * @Description: 微信支付
 * @Date: Created in 16:27 2018/8/14
 */
@Controller
@RequestMapping("/wechatpay")
public class WeChatPayController {
	private static final Logger logger = 
			LoggerFactory.getLogger(WeChatPayController.class);
	
	@Autowired
	private WeChatPayService weChatPayService;
	
	@RequestMapping("/unifiedorder")
	@ResponseBody
    public ResponseJson unifiedorder(String orderNo) {
        ResponseJson responseJson = new ResponseJson();
        
        try{
        	responseJson = weChatPayService.unifiedorder(new BigDecimal(orderNo));
        	
        }catch (Exception e) {
        	e.printStackTrace();
			logger.error("微信統一下單介面服務端異常,異常資訊---" + e.getMessage(), e);
			return CommonUtil.createResponseJson(
					CodeMsg.SERVER_ERROR_CODE, CodeMsg.SERVER_ERROR_MSG, new JSONObject());
        }
        return responseJson;
    }
}

WeChatPayService介面類

package com.hisap.xql.api.service;

import java.math.BigDecimal;

import com.hisap.xql.api.common.bean.ResponseJson;
import com.hisap.xql.api.common.wechat.WeChatNotifyResult;

/**
 * @Author: QijieLiu
 * @Description: 微信支付
 * @Date: Created in 16:35 2018/8/14
 */
public interface WeChatPayService {
	ResponseJson unifiedorder(BigDecimal orderNo) throws Exception;
}

WeChatPayServiceImpl介面實現類

package com.hisap.xql.api.service.impl;

import java.math.BigDecimal;
import java.util.List;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.alibaba.fastjson.JSONObject;
import com.hisap.xql.api.common.bean.ResponseJson;
import com.hisap.xql.api.common.constant.CodeMsg;
import com.hisap.xql.api.common.utils.Collections3;
import com.hisap.xql.api.common.utils.CommonUtil;
import com.hisap.xql.api.common.wechat.WeChatConfig;
import com.hisap.xql.api.dao.XqlOrderGoodsMapper;
import com.hisap.xql.api.dao.XqlWxRefundLogMapper;
import com.hisap.xql.api.model.XqlOrder;
import com.hisap.xql.api.model.XqlOrderGoods;
import com.hisap.xql.api.model.XqlOrderGoodsExample;
import com.hisap.xql.api.service.WeChatPayService;
import com.hisap.xql.api.service.XqlOrderService;
import com.lijing.wechatpay.conn.PaymentTools;
import com.lijing.wechatpay.util.PayMD5;

@Service
public class WeChatPayServiceImpl implements WeChatPayService {

	private static final Logger logger = LoggerFactory
			.getLogger(WeChatPayServiceImpl.class);

	@Autowired
	XqlOrderService xqlOrderServiceImpl;

	@Autowired
	XqlOrderGoodsMapper xqlOrderGoodsMapper;
	
	@Autowired
	XqlWxRefundLogMapper xqlWxRefundLogMapper;

	
	/**
	 * 統一下單
	 * 
	 * @param characterEncoding
	 * @param parameters
	 * @return
	 */
	@Override
	public ResponseJson unifiedorder(BigDecimal orderNo) throws Exception {
		ResponseJson responseJson = new ResponseJson();

		/** 訂單主資訊 */
		XqlOrder xqlOrder = xqlOrderServiceImpl
				.selectXqlOrderByOrderNo(orderNo);
		if (xqlOrder == null) {
			return CommonUtil.createResponseJson(CodeMsg.ORDER_NOT_EXIST_CODE,
					CodeMsg.ORDER_NOT_EXIST_MSG, new JSONObject());
		}

		/** 訂單明細資訊 */
		XqlOrderGoodsExample xqlOrderGoodsExample = new XqlOrderGoodsExample();
		XqlOrderGoodsExample.Criteria criteria = xqlOrderGoodsExample
				.createCriteria();
		criteria.andOrderNoEqualTo(orderNo);

		List<XqlOrderGoods> xqlOrderGoodsList = xqlOrderGoodsMapper
				.selectByExample(xqlOrderGoodsExample);
		if (Collections3.isEmpty(xqlOrderGoodsList)) {
			return CommonUtil.createResponseJson(
					CodeMsg.ORDER_ITEM_NOT_EXIST_CODE,
					CodeMsg.ORDER_ITEM_NOT_EXIST_MSG, new JSONObject());
		}
		XqlOrderGoods xqlOrderGoods = xqlOrderGoodsList.get(0);

                //待新增驗證庫存、微信券邏輯

		TreeMap<String, Object> parameters = new TreeMap<String, Object>();
		parameters.put("appid", WeChatConfig.APP_ID);
		parameters.put("mch_id", WeChatConfig.MCH_ID);
		parameters.put("nonce_str", PayMD5.GetMD5nonce_str());
		parameters.put("body", xqlOrderGoods.getGoodsName());
		parameters.put("out_trade_no", orderNo.toString());
		parameters.put("total_fee", xqlOrder.getOrderAmount());
		parameters.put("spbill_create_ip", PaymentTools.getServerIP());
		parameters.put("notify_url", WeChatConfig.NOTIFY_URL);
		parameters.put("trade_type", WeChatConfig.TRADE_TYPE);
		String sign = com.hisap.xql.api.common.wechat.CommonUtil.createSign("UTF-8", parameters);
		parameters.put("sign", sign); // 把簽名後的資料組裝成引數
		
		String tosend = com.hisap.xql.api.common.wechat.CommonUtil.getRequestXml(parameters);
		logger.info("微信統一下單請求資料xml:" + tosend);
		try {
			String result = com.hisap.xql.api.common.wechat.CommonUtil.httpsRequest(WeChatConfig.UNIFIEDORDER_URL, "POST", tosend);
			logger.info("微信統一下單返回資料xml:" + result);
			
			Map<String, String> map = null;
	        JSONObject jsonObject = new JSONObject();
	        SortedMap<String, Object> signParam = new TreeMap<String, Object>();
			map = com.hisap.xql.api.common.wechat.CommonUtil.doXMLParse(result);
			String return_code = map.get("return_code");
            String prepay_id = null;
            if (return_code.equalsIgnoreCase("SUCCESS")) {
            	String result_code = map.get("result_code");
            	if(result_code.equalsIgnoreCase("SUCCESS")){
            		prepay_id = map.get("prepay_id");//獲取到prepay_id
            		
                    signParam.put("appid", WeChatConfig.APP_ID);
                    signParam.put("partnerid", WeChatConfig.MCH_ID);
                    signParam.put("prepayid", prepay_id);
                    signParam.put("package", "Sign=WXPay");
                    signParam.put("noncestr", com.hisap.xql.api.common.wechat.CommonUtil.getRandomString(32));//自定義不重複的長度不長於32位
                    signParam.put("timestamp", DateUtil.getSecondTimestamp(new Date()).toString());//此處長度必須為10位
                    String signAgain = com.hisap.xql.api.common.wechat.CommonUtil.createSign("UTF-8", signParam);//再次生成簽名
                    signParam.put("sign", signAgain);
                    responseJson = CommonUtil.createResponseJson(
							CodeMsg.SUCCESS_CODE, CodeMsg.SUCCESS_MSG,
							signParam);
                    
            	}else{
            		responseJson = CommonUtil.createResponseJson(
            				map.get("err_code"), map.get("err_code_des"),
							null);
            	}
            }else{
            	responseJson = CommonUtil.createResponseJson(
            			map.get("return_code"), map.get("return_msg"),
						null);
            }
		} catch (Exception e) {
			e.printStackTrace();
			logger.error("微信統一下單介面服務端異常,異常資訊---" + e.getMessage(), e);
			responseJson = CommonUtil.createResponseJson(
					CodeMsg.SERVER_ERROR_CODE, CodeMsg.SERVER_ERROR_MSG,
					null);
		}

		return responseJson;
	}
}

呼叫之後，返回給APP的內容如下：

{
  "code": "200",
  "message": "success",
  "data": {
    "time": "1534908545",
    "response": {
      "appid": "xxxxxx",
      "noncestr": "lKbA8N9J72Swn3XY3JEMVBZLFhWAHaAU",
      "package": "Sign=WXPay",
      "partnerid": "xxxxxx",
      "prepayid": "wx22112827286690ddf3b03c1a3649843158",
      "sign": "FEF21A3A65540ECB1F18DBF58DE57F68",
      "timestamp": "1534908527"
    }
  }
}

這裡返回給app二次加簽的時候，timestamp必須為string型別，且長度為10位，不然app支付的時候會報驗籤失敗錯誤。微信支付的統一下單就講到這裡，下一章講述微信支付結果通知介面開發。

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