業務需求
商戶自定義金額生成二維碼,掃描二維碼進行自定義金額支付
官方文檔鏈接
https://pay.weixin.qq.com/wiki/doc/api/native.php?chapter=6_4
接口代碼
@RequestMapping(value = "/companyReceipt")
@ResponseBody
public String companyReceipt(TTemplatePay tTemplatePay) throws Exception {
JSONObject jsonObject = new JSONObject();
PayUtil payUtil = new PayUtil();
String codeUrl = "";
// 公衆賬號ID
payUtil.setAppid(PAY_APPID);
// 商戶號
payUtil.setMch_id(PAY_MCH_ID);
payUtil.setOut_trade_no(WeixinpayUtil.getUUID());
payUtil.setNonce_str(WeixinpayUtil.getUUID());
// 通知地址(支付成功,回調接口地址)
payUtil.setNotify_url(NOTIFY_URL);
// 自定義支付金額(單位:分)
payUtil.setTotal_fee(tTemplatePay.getTotalFee()*100);
LOGGER.info("------企業支付生成支付二維碼,支付金額money{}", payUtil.getTotal_fee());
// 企業指定金額生成支付二維碼
Map<String, Object> map = WxCompanyReceiptUtil.wxCompanyReceipt(payUtil);
if(StringUtils.equals("SUCCESS", map.get("result_code").toString()) && StringUtils.equals("SUCCESS", map.get("return_code").toString())){
tTemplatePay.setOutTradeNo(payUtil.getOut_trade_no());
tTemplatePay.setNonceStr(payUtil.getNonce_str());
// 支付訂單信息添加到數據庫
int i = payService.insertTemplateOrder(tTemplatePay);
if(i > 0){
// 二維碼鏈接
codeUrl = map.get("code_url").toString();
jsonObject.accumulate("codeUrl", codeUrl);
LOGGER.info("------企業支付生成支付二維碼,支付二維碼鏈接{}", codeUrl);
LOGGER.info("------企業生成支付二維碼,掃碼支付訂單入庫{}", "SUCCESS");
}else{
LOGGER.info("------企業生成支付二維碼,掃碼支付訂單入庫{}", "ERROR");
}
}else{
LOGGER.info("------企業生成支付二維碼{}", "ERROR");
}
return jsonObject.toString();
}
組裝參數請求獲取二維碼
package com.litte.util;
import com.litte.entity.PayUtil;
import com.litte.util.wxpay.WXPayUtil;
import java.util.Map;
public class WxCompanyReceiptUtil {
/**
* @Description: 企業指定金額生成支付二維碼
* @Author: Mr.Jkx
* @Date: 2019/4/10 10:40
*/
public static Map<String, Object> wxCompanyReceipt(PayUtil payUtil) throws Exception {
String stringA = "appid=" + payUtil.getAppid()
+ "&body=商品描述"
+ "&mch_id=" + payUtil.getMch_id()
+ "&nonce_str=" + payUtil.getNonce_str()
+ "¬ify_url=" + "https://域名/wxPay/companyReceiptBack"
+ "&out_trade_no=" + payUtil.getOut_trade_no()
+ "&spbill_create_ip=Ip" // 終端IP
+ "&total_fee="+ payUtil.getTotal_fee()
+ "&trade_type=NATIVE"
+ "&key=支付祕鑰";
String sign = Md5Util.md5(stringA).toUpperCase();
String xml = "<xml>" +
" <appid>" + payUtil.getAppid() + "</appid>" +
" <body>商品描述</body>" +
" <mch_id>" + payUtil.getMch_id() + "</mch_id>" +
" <nonce_str>" + payUtil.getNonce_str() + "</nonce_str>" +
" <notify_url>NOTIFY_URL</notify_url>" +
" <out_trade_no>" + payUtil.getOut_trade_no() + "</out_trade_no>" +
" <spbill_create_ip>Ip</spbill_create_ip>" +
" <total_fee>" + payUtil.getTotal_fee() + "</total_fee>" +
" <trade_type>NATIVE</trade_type>" +
" <sign>" + sign + "</sign>" +
"</xml> ";
System.out.println("調試模式_統一下單接口 請求XML數據:" + xml);
//調用統一下單接口,並接受返回的結果
String result = BasePay.httpRequest("https://api.mch.weixin.qq.com/pay/unifiedorder", "POST", xml);
// 將解析結果存儲在HashMap中
Map map = WXPayUtil.xmlToMap(result);
return map;
}
}
請求方法類
package com.litte.util;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
public class BasePay {
/**
*
* *
* * @param requestUrl請求地址
* * @param requestMethod請求方法
* * @param outputStr參數
*
*/
public static String httpRequest(String requestUrl, String requestMethod, String outputStr) {
// 創建SSLContext
StringBuffer buffer = null;
try {
URL url = new URL(requestUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod(requestMethod);
conn.setDoOutput(true);
conn.setDoInput(true);
conn.connect();
//往服務器端寫內容
if (null != outputStr) {
OutputStream os = conn.getOutputStream();
os.write(outputStr.getBytes("utf-8"));
os.close();
}
// 讀取服務器端返回的內容
InputStream is = conn.getInputStream();
InputStreamReader isr = new InputStreamReader(is, "utf-8");
BufferedReader br = new BufferedReader(isr);
buffer = new StringBuffer();
String line = null;
while ((line = br.readLine()) != null) {
buffer.append(line);
}
br.close();
} catch (Exception e) {
e.printStackTrace();
}
return buffer.toString();
}
}
支付後回調請求接口
/**
* @Description: 企業微信返回信息,更改訂單狀態
* @Author: Mr.Jkx
* @Date: 2019/4/27 18:28
*/
@RequestMapping(value = "/companyReceiptBack")
@ResponseBody
public void companyReceiptBack(HttpServletRequest request) throws Exception {
String xmlStr = NotifyServlet.getWxXml(request);
LOGGER.info("------掃描企業支付二維碼回調請求數據{}", xmlStr);
// 解析回調請求參數
Map map2 = WXPayUtil.xmlToMap(xmlStr);
// 根據回調參數操作訂單信息
// TODO
}
微信相關工具類
package com.litte.util.wxpay;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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.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.ByteArrayInputStream;
import java.io.InputStream;
import java.io.StringWriter;
import java.security.MessageDigest;
import java.security.SecureRandom;
import java.util.*;
public class WXPayUtil {
private static final String SYMBOLS = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
private static final Random RANDOM = new SecureRandom();
/**
* XML格式字符串轉換爲Map
*
* @param strXML XML字符串
* @return XML數據轉換後的Map
* @throws Exception
*/
public static Map<String, String> xmlToMap(String strXML) throws Exception {
try {
Map<String, String> data = new HashMap<String, String>();
DocumentBuilder documentBuilder = WXPayXmlUtil.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;
}
}
/**
* 將Map轉換爲XML格式的字符串
*
* @param data Map類型數據
* @return XML格式的字符串
* @throws Exception
*/
public static String mapToXml(Map<String, String> data) throws Exception {
org.w3c.dom.Document document = WXPayXmlUtil.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;
}
/**
* 生成帶有 sign 的 XML 格式字符串
*
* @param data Map類型數據
* @param key API密鑰
* @return 含有sign字段的XML
*/
public static String generateSignedXml(final Map<String, String> data, String key) throws Exception {
return generateSignedXml(data, key, WXPayConstants.SignType.MD5);
}
/**
* 生成帶有 sign 的 XML 格式字符串
*
* @param data Map類型數據
* @param key API密鑰
* @param signType 簽名類型
* @return 含有sign字段的XML
*/
public static String generateSignedXml(final Map<String, String> data, String key, WXPayConstants.SignType signType) throws Exception {
String sign = generateSignature(data, key, signType);
data.put(WXPayConstants.FIELD_SIGN, sign);
return mapToXml(data);
}
/**
* 判斷簽名是否正確
*
* @param xmlStr XML格式數據
* @param key API密鑰
* @return 簽名是否正確
* @throws Exception
*/
public static boolean isSignatureValid(String xmlStr, String key) throws Exception {
Map<String, String> data = xmlToMap(xmlStr);
if (!data.containsKey(WXPayConstants.FIELD_SIGN) ) {
return false;
}
String sign = data.get(WXPayConstants.FIELD_SIGN);
return generateSignature(data, key).equals(sign);
}
/**
* 判斷簽名是否正確,必須包含sign字段,否則返回false。使用MD5簽名。
*
* @param data Map類型數據
* @param key API密鑰
* @return 簽名是否正確
* @throws Exception
*/
public static boolean isSignatureValid(Map<String, String> data, String key) throws Exception {
return isSignatureValid(data, key, WXPayConstants.SignType.MD5);
}
/**
* 判斷簽名是否正確,必須包含sign字段,否則返回false。
*
* @param data Map類型數據
* @param key API密鑰
* @param signType 簽名方式
* @return 簽名是否正確
* @throws Exception
*/
public static boolean isSignatureValid(Map<String, String> data, String key, WXPayConstants.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);
}
/**
* 生成簽名
*
* @param data 待簽名數據
* @param key API密鑰
* @return 簽名
*/
public static String generateSignature(final Map<String, String> data, String key) throws Exception {
return generateSignature(data, key, WXPayConstants.SignType.MD5);
}
/**
* 生成簽名. 注意,若含有sign_type字段,必須和signType參數保持一致。
*
* @param data 待簽名數據
* @param key API密鑰
* @param signType 簽名方式
* @return 簽名
*/
public static String generateSignature(final Map<String, String> data, String key, WXPayConstants.SignType signType) throws Exception {
Set<String> 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) // 參數值爲空,則不參與簽名
sb.append(k).append("=").append(data.get(k).trim()).append("&");
}
sb.append("key=").append(key);
if (WXPayConstants.SignType.MD5.equals(signType)) {
return MD5(sb.toString()).toUpperCase();
}
else if (WXPayConstants.SignType.HMACSHA256.equals(signType)) {
return HMACSHA256(sb.toString(), key);
}
else {
throw new Exception(String.format("Invalid sign_type: %s", signType));
}
}
/**
* 獲取隨機字符串 Nonce Str
*
* @return String 隨機字符串
*/
public static String generateNonceStr() {
char[] nonceChars = new char[32];
for (int index = 0; index < nonceChars.length; ++index) {
nonceChars[index] = SYMBOLS.charAt(RANDOM.nextInt(SYMBOLS.length()));
}
return new String(nonceChars);
}
/**
* 生成 MD5
*
* @param data 待處理數據
* @return MD5結果
*/
public static String MD5(String data) throws Exception {
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 待處理數據
* @param key 密鑰
* @return 加密結果
* @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();
}
/**
* 日誌
* @return
*/
public static Logger getLogger() {
Logger logger = LoggerFactory.getLogger("wxpay java sdk");
return logger;
}
/**
* 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();
}
}
微信商戶平臺
實現自定義二維碼生成功能必須在“微信商戶平臺”開通“Native支付”支付產品;