微信JSAPI支付（v3）

开发指引（微信官方文档开发指引-JSAPI支付 | 微信支付商户平台文档中心）

支付业务流程图

支付代码（Java）

封装支付参数

public Map<String, Object> h5PayNow(HttpServletRequest res, BigDecimal orderPaymentAll, String orderNum,String openid) {Map<String, Object> maps = new HashMap<String, Object>();try {//初始化支付参数int totalFee = orderPaymentAll.multiply(new BigDecimal(100)).intValue();JSONObject param=new JSONObject();param.put("out_trade_no", orderNum);param.put("appid", wechatpay_h5_appid);param.put("mchid", wechatpay_mch_id);param.put("description", "产品说明");JSONObject amount=new JSONObject();amount.put("total", totalFee);param.put("amount", amount);JSONObject payer=new JSONObject();payer.put("openid", openid);param.put("payer", payer);param.put("notify_url", wechatpay_notify_url);String s = WXPayUtil.obj2json(param);//发送预支付请求String result = WXPayUtil.wxDoPostJson(wechatpay_h5_payUrl, s);System.out.println("result=======================" + result);JSONObject prepayObject = JSONObject.parseObject(result);String prepay_id =prepayObject.get("prepay_id").toString();JSONObject jsonObject = WxSignV3Utils.WxTuneUp(prepay_id, wechatpay_h5_appid);return jsonObject;} catch (Exception e) {e.printStackTrace();return null;}
}

//相关工具类

import com.alibaba.fastjson.JSONObject;
import com.qijinzhi.project.website.modules.business.pay.wxpay.KeyPairFactory;
import com.squareup.okhttp.HttpUrl;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;import java.io.UnsupportedEncodingException;
import java.security.*;
import java.security.spec.InvalidKeySpecException;
import java.util.*;/*** @ClassName WxSignV3Utils* @Description* @Date 2023/3/3 18:35* @Version 1.0*/
@Component
public class WxSignV3Utils {//V3主商户IDprivate static String merchantId;//微信商户平台APIv3证书序列号private static String certificateSerialNo;//私钥//cert_p12_Pathprivate static String certP12Path;// 自己配置文件的mchid_路径@Value("${wx.pay.mchId}")public void setMerchantId(String merchantId) {WxSignV3Utils.merchantId = merchantId;}@Value("${wx.pay.certificate_Serial_No}")public void setCertificateSerialNo(String certificateSerialNo) {WxSignV3Utils.certificateSerialNo = certificateSerialNo;}@Value("${wx.pay.cert_p12_Path}")public void setCertP12Path(String certP12Path) {WxSignV3Utils.certP12Path = certP12Path;}/*** 使用方法** @param method 请求方法* @param url    请求url* @param body   请求内容* @return*/public static HashMap<String, String> getSignMap(String method, String url, String body) throws InvalidKeySpecException, NoSuchAlgorithmException, UnsupportedEncodingException, InvalidKeyException, SignatureException {String authorization = getSign(method, url, body);HashMap<String, String> headsMap = new HashMap<>();headsMap.put("Authorization", authorization);headsMap.put("Content-Type", "application/json");headsMap.put("Accept", "application/json");return headsMap;}public static String getSign(String method, String url, String body) throws NoSuchAlgorithmException, SignatureException, InvalidKeySpecException, InvalidKeyException, UnsupportedEncodingException {return "WECHATPAY2-SHA256-RSA2048 " + getToken(method, HttpUrl.parse(url), body);}public static String getToken(String method, HttpUrl url, String body) throws UnsupportedEncodingException, SignatureException, NoSuchAlgorithmException, InvalidKeySpecException, InvalidKeyException {String nonceStr = nonceString();long timestamp = System.currentTimeMillis() / 1000;String message = buildMessage(method, url, timestamp, nonceStr, body);String signature = sign(message.getBytes("utf-8"));return "mchid=\"" + merchantId + "\","+ "nonce_str=\"" + nonceStr + "\","+ "timestamp=\"" + timestamp + "\","+ "serial_no=\"" + certificateSerialNo + "\","+ "signature=\"" + signature + "\"";}public static String sign(byte[] message) throws NoSuchAlgorithmException, InvalidKeySpecException, InvalidKeyException, SignatureException {Signature sign = Signature.getInstance("SHA256withRSA");//sign.initSign(getPKCS8PrivateKey(privateKey));KeyPair pkcs12 = new KeyPairFactory().createPKCS12(certP12Path, merchantId);PrivateKey aPrivate = pkcs12.getPrivate();sign.initSign(aPrivate);sign.update(message);return Base64.getEncoder().encodeToString(sign.sign());}public static String buildMessage(String method, HttpUrl url, long timestamp, String nonceStr, String body) {String canonicalUrl = url.encodedPath();if (url.encodedQuery() != null) {canonicalUrl += "?" + url.encodedQuery();}return method + "\n"+ canonicalUrl + "\n"+ timestamp + "\n"+ nonceStr + "\n"+ body + "\n";}public static String nonceString() {String currTime = String.format("%d", (long) System.currentTimeMillis() / 1000);String strTime = currTime.substring(8, currTime.length());Random random = new Random();int num = (int) (random.nextDouble() * (1000000 - 100000) + 100000);String code = String.format("%06d", num);String nonce_str = currTime.substring(2) + code;return nonce_str;}/*** 微信调起支付参数* 返回参数如有不理解 请访问微信官方文档* https://pay.weixin.qq.com/wiki/doc/apiv3/apis/chapter4_1_4.shtml** @param prepayId           微信下单返回的prepay_id* @param appId              应用ID(appid)* @return 当前调起支付所需的参数* @throws Exception*/public static JSONObject WxTuneUp(String prepayId, String appId) throws Exception {String time = System.currentTimeMillis() / 1000 + "";String nonceStr = UUID.randomUUID().toString().replace("-", "");String packageStr = "prepay_id=" + prepayId;ArrayList<String> list = new ArrayList<>();list.add(appId);list.add(time);list.add(nonceStr);list.add(packageStr);//加载签名String packageSign = sign(buildSignMessage(list).getBytes());JSONObject jsonObject = new JSONObject();jsonObject.put("appid", appId);jsonObject.put("timeStamp", time);jsonObject.put("nonceStr", nonceStr);jsonObject.put("packages", packageStr);jsonObject.put("signType", "RSA");jsonObject.put("paySign", packageSign);return jsonObject;}/*** 构造签名串** @param signMessage 待签名的参数* @return 构造后带待签名串*/static String buildSignMessage(ArrayList<String> signMessage) {if (signMessage == null || signMessage.size() <= 0) {return null;}StringBuilder sbf = new StringBuilder();for (String str : signMessage) {sbf.append(str).append("\n");}return sbf.toString();}}

//WXPayUtil工具类

import com.qijinzhi.project.website.modules.business.pay.WxSignV3Utils;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.apache.http.impl.client.HttpClients;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 java.io.*;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SignatureException;
import java.security.spec.InvalidKeySpecException;
import java.util.*;
import com.fasterxml.jackson.databind.ObjectMapper;public class WXPayUtil {private static ObjectMapper objectMapper=new ObjectMapper();/*** 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<String, String> xmlToMap(String strXML) throws Exception {try {Map<String, String> data = new HashMap<String, String>();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 < nodeList.getLength(); ++idx) {Node node = nodeList.item(idx);if (node.getNodeType() == Node.ELEMENT_NODE) {org.w3c.dom.Element element = (org.w3c.dom.Element) node;data.put(element.getNodeName(), element.getTextContent());}}try {stream.close();} catch (Exception ex) {// do nothing}return data;} catch (Exception ex) {WXPayUtil.getLogger().warn("Invalid XML, can not convert to map. Error message: {}. XML content: {}", ex.getMessage(), strXML);throw ex;}}/*** 将Map转换为XML格式的字符串* @param data Map类型数据* @return XML格式的字符串* @throws Exception*/public static String mapToXml(Map<String, String> 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;}/*** 日志* @return*/public static Logger getLogger() {Logger logger = LoggerFactory.getLogger("wxpay java sdk");return logger;}/** 将SortedMap<Object,Object> 集合转化成 xml格式*/@SuppressWarnings("rawtypes")public static String getRequestXml(SortedMap<Object,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 k = (String)entry.getKey();String v = (String)entry.getValue();if ("attach".equalsIgnoreCase(k)||"body".equalsIgnoreCase(k)||"sign".equalsIgnoreCase(k)) {sb.append("<"+k+">"+"<![CDATA["+v+"]]></"+k+">");}else {sb.append("<"+k+">"+v+"</"+k+">");}}sb.append("</xml>");return sb.toString();
}public static String obj2json(Object obj) throws Exception {return objectMapper.writeValueAsString(obj);}/* * 发送post请求，携带json类型数据* 如：{"name":"jok","age":"10"}** @param url  请求地址* @param json json格式参数* @return*/public static String wxDoPostJson(String url, String json) {// 创建Httpclient对象CloseableHttpClient httpClient = HttpClients.createDefault();CloseableHttpResponse response = null;String resultString = "";try {// 创建Http Post请求HttpPost httpPost = new HttpPost(url);//获取签名请求头HashMap<String, String> heads = null;try {heads = WxSignV3Utils.getSignMap("POST", url, json);} catch (InvalidKeySpecException e) {e.printStackTrace();} catch (NoSuchAlgorithmException e) {e.printStackTrace();} catch (UnsupportedEncodingException e) {e.printStackTrace();} catch (InvalidKeyException e) {e.printStackTrace();} catch (SignatureException e) {e.printStackTrace();}httpPost.addHeader("Authorization", heads.get("Authorization"));httpPost.addHeader("Accept", heads.get("Accept"));httpPost.addHeader("Content-Type",heads.get("Content-Type"));// 创建请求内容StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON);httpPost.setEntity(entity);// 执行http请求response = httpClient.execute(httpPost);resultString = EntityUtils.toString(response.getEntity(), "utf-8");} catch (Exception e) {e.printStackTrace();} finally {try {response.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}return resultString;}

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