SpringBoot 微信退款功能的示例代码

一：微信支付证书配置

二：证书读取以及读取后的使用

package com.zhx.guides.assistant.config.wechatpay; import org.apache.commons.io.IOUtils;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.springframework.core.io.ClassPathResource; import javax.net.ssl.SSLContext;import java.io.ByteArrayInputStream;import java.io.IOException;import java.io.InputStream;import java.security.KeyStore; /** * @Class WeChatConfigUtil * @Version 1.0 * @Date 创建时间：2020-06-15 16:19 * @Copyright Copyright by * @Direction 类说明 */public class WeChatConfigUtil { private static byte[] certData; /**** * @throws Exception */ static { try { //从微信商户平台下载的安全证书存放的目录 //String certPath = 'D:configapiclient_cert.p12'; //File file = new File(certPath); //InputStream certStream = new FileInputStream(file); //使用springboot配置文件内读取的方式 ClassPathResource classPathResource = new ClassPathResource('user_keyapiclient_cert.p12'); InputStream certStream = classPathResource.getInputStream(); WeChatConfigUtil.certData = IOUtils.toByteArray(certStream); certStream.read(WeChatConfigUtil.certData); certStream.close(); } catch (IOException e) { e.printStackTrace(); } } /** * 开始退款操作 * * @param mchId 商户ID * @param url 请求URL * @param data 退款参数 * @return * @throws Exception */ public static String doRefund(String mchId, String url, String data) throws Exception { /** * 注意PKCS12证书 是从微信商户平台-》账户设置-》 API安全 中下载的 */ KeyStore keyStore = KeyStore.getInstance('PKCS12'); //这里自行实现我是使用数据库配置将证书上传到了服务器可以使用 FileInputStream读取本地文件 //ByteArrayInputStream inputStream = FileUtil.getInputStream('https://############################.p12'); ByteArrayInputStream inputStream = new ByteArrayInputStream(WeChatConfigUtil.certData); try { //这里写密码..默认是你的MCHID keyStore.load(inputStream, mchId.toCharArray()); } finally { inputStream.close(); } SSLContext sslcontext = SSLContexts.custom()//这里也是写密码的.loadKeyMaterial(keyStore, mchId.toCharArray()).build(); SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslcontext,SSLConnectionSocketFactory.getDefaultHostnameVerifier()); CloseableHttpClient httpclient = HttpClients.custom().setSSLSocketFactory(sslsf).build(); try { HttpPost httpost = new HttpPost(url); httpost.setEntity(new StringEntity(data, 'UTF-8')); CloseableHttpResponse response = httpclient.execute(httpost); try {HttpEntity entity = response.getEntity();//接受到返回信息String jsonStr = EntityUtils.toString(response.getEntity(), 'UTF-8');EntityUtils.consume(entity);return jsonStr; } finally {response.close(); } } finally { httpclient.close(); } } }

三：发起订单退款操作

/** * 封装查询请求数据 * @param tradeRefund 退款订单请求信息 * @param path数据访问PATH * @return */private static SortedMap<String, Object> refundData( TradeRefund tradeRefund , String path ) throws Exception {//构建参数Map<String, String> dataMap = new HashMap<>();dataMap.put('appid','wx#################');dataMap.put('mch_id','137#############');//自行实现该随机串dataMap.put('nonce_str',Core.MD5('12344'));dataMap.put('out_trade_no','P190808170038402889c5318502');dataMap.put('out_refund_no','P190808170038402889c5318502');dataMap.put('total_fee','1');dataMap.put('refund_fee','1');dataMap.put('refund_desc','退款');//生成签名String sign = PayToolUtil.createSign('UTF-8', dataMap , WeichatPayConfigure.API_KEY );//WXPayUtil.generateSignature(dataMap, 'rv4###################');dataMap.put('sign', sign);//map数据转xmlString requestXML = getRequestXml( dataMap );logger.info( '订单退款请求参数：n' + requestXML );//发起退款String responseXml = WeChatConfigUtil.doRefund( WeichatPayConfigure.MCH_ID , 'https://api.mch.weixin.qq.com/secapi/pay/refund', requestXML );} /** * @author * @date 2016-4-22 * @Description：将请求参数转换为xml格式的string * @param parameters * 请求参数 * @return */ 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(); }

/** * @author * @date 2016-4-22 * @Description：sign签名 * @param characterEncoding * 编码格式 * @param packageParams * 请求参数 * @return */ public static String createSign(String characterEncoding, SortedMap<Object, Object> packageParams, String API_KEY) { 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 (null != v && !''.equals(v) && !'sign'.equals(k) && !'key'.equals(k)) { sb.append(k + '=' + v + '&'); } } sb.append('key=' + API_KEY); String sign = MD5Util.MD5Encode(sb.toString(), characterEncoding).toUpperCase(); return sign; }

package com.zhx.guides.assistant.interfaces.pay.wechatpay.util; import java.security.MessageDigest; public class MD5Util { 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; } /*** * 简化版本 * @param s * @return */ 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('utf-8');// 获得MD5摘要算法的 MessageDigest 对象MessageDigest mdInst = MessageDigest.getInstance('MD5');// 使用指定的字节更新摘要mdInst.update(btInput);// 获得密文byte[] md = mdInst.digest();// 把密文转换成十六进制的字符串形式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 final String hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; }

/** * @author * @date 2016-4-22 * @Description：将请求参数转换为xml格式的string * @param parameters * 请求参数 * @return */ 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(); }

四：请求XML示例

<xml> <appid>wx2421b1c4370ec43b</appid> <mch_id>10000100</mch_id> <nonce_str>6cefdb308e1e2e8aabd48cf79e546a02</nonce_str> <out_refund_no>1415701182</out_refund_no> <out_trade_no>1415757673</out_trade_no> <refund_fee>1</refund_fee> <total_fee>1</total_fee> <transaction_id></transaction_id> <sign>FE56DD4AA85C0EECA82C35595A69E153</sign></xml>

五：官方信息

官方地址：https://pay.weixin.qq.com/wiki/doc/api/wxa/wxa_api.php?chapter=9_4

需注意这两个参数我使用的是out_trade_no

总结

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