微信退款简单实现(复制代码就能在本地运行实现)

小程序微信支付工具类(新手无需看懂，CV就行)

package myst.yynz.back.util;import org.apache.commons.codec.digest.DigestUtils;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.security.SignatureException;
import java.util.*;public class PayUtil {/*** 签名字符串* @param text 需要签名的字符串* @param key 密钥* @param input_charset 编码格式* @return 签名结果*/public static String sign(String text, String key, String input_charset) {text = text + "&key="+key;return DigestUtils.md5Hex(getContentBytes(text, input_charset));}/*** @param content* @param charset* @return* @throws SignatureException* @throws UnsupportedEncodingException*/public static byte[] getContentBytes(String content, String charset) {if (charset == null || "".equals(charset)) {return content.getBytes();}try {return content.getBytes(charset);} catch (UnsupportedEncodingException e) {throw new RuntimeException("MD5签名过程中出现错误,指定的编码集不对,您目前指定的编码集是:" + charset);}}/*** 生成6位或10位随机数 param codeLength(多少位)* @return*/public static String createCode(int codeLength) {String code = "";for (int i = 0; i < codeLength; i++) {code += (int) (Math.random() * 9);}return code;}private static boolean isValidChar(char ch) {if ((ch >= '0' && ch <= '9') || (ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z'))return true;if ((ch >= 0x4e00 && ch <= 0x7fff) || (ch >= 0x8000 && ch <= 0x952f))return true;// 简体中文汉字编码return false;}/*** 除去数组中的空值和签名参数* @param sArray 签名参数组* @return 去掉空值与签名参数后的新签名参数组*/public static Map paraFilter(Map <String,String> sArray) {Map result = new HashMap();if (sArray == null || sArray.size() <= 0) {return result;}for (String key : sArray.keySet()) {String value = sArray.get(key);if (value == null || value.equals("") || key.equalsIgnoreCase("sign")|| key.equalsIgnoreCase("sign_type")) {continue;}result.put(key, value);}return result;}/*** 把数组所有元素排序，并按照“参数=参数值”的模式用“&”字符拼接成字符串* @param params 需要排序并参与字符拼接的参数组* @return 拼接后字符串*/public static String createLinkString(Map <String,String> params) {List <String> keys = new ArrayList <String> (params.keySet());Collections.sort(keys);String preStr = "";for (int i = 0; i < keys.size(); i++) {String key = keys.get(i);String value = params.get(key);if (i == keys.size() - 1) {// 拼接时，不包括最后一个&字符preStr = preStr + key + "=" + value;} else {preStr = preStr + key + "=" + value + "&";}}return preStr;}/**** @param requestUrl 请求地址* @param requestMethod 请求方法* @param outputStr 参数*/public static String httpRequest(String requestUrl,String requestMethod,String outputStr){// 创建SSLContextStringBuffer buffer=null;try{URL url = new URL(requestUrl);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setRequestMethod(requestMethod);conn.setDoOutput(true);conn.setDoInput(true);conn.connect();//往服务器端写内容if(null !=outputStr){OutputStream os=conn.getOutputStream();os.write(outputStr.getBytes("utf-8"));os.close();}// 读取服务器端返回的内容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);}}catch(Exception e){e.printStackTrace();}return buffer.toString();}public static String urlEncodeUTF8(String source){String result=source;try {result=java.net.URLEncoder.encode(source, "UTF-8");} catch (UnsupportedEncodingException e) {// TODO Auto-generated catch blocke.printStackTrace();}return result;}/*** 解析xml,返回第一级元素键值对。如果第一级元素有子节点，则此节点的值是子节点的xml数据。* @param strxml* @return* @throws IOException*/public static InputStream String2Inputstream(String strxml) throws IOException {return new ByteArrayInputStream(strxml.getBytes("UTF-8"));}public static Map doXMLParse(String strxml) throws Exception {Map<String, String> map = new HashMap<String, String>();if(null == strxml || "".equals(strxml)) {return null;}InputStream in = String2Inputstream(strxml);SAXReader read = new SAXReader();Document doc = read.read(in);//得到xml根元素Element root = doc.getRootElement();//遍历  得到根元素的所有子节点@SuppressWarnings("unchecked")List<Element> list = root.elements();for (Element element : list) {//装进mapmap.put(element.getName(), element.getText());}//关闭流in.close();return map;}public static String GetMapToXML(Map<String,String> param){StringBuffer sb = new StringBuffer();sb.append("<xml>");for (Map.Entry<String,String> entry : param.entrySet()) {sb.append("<"+ entry.getKey() +">");sb.append(entry.getValue());sb.append("</"+ entry.getKey() +">");}sb.append("</xml>");return sb.toString();}
}

常量类(主要存放微信小程序的相关参数)

package myst.yynz.back.util;//import com.jfinal.kit.PropKit;public class Constants {//商户号public static final String MCH_ID = "**********";  //必填//商户号密钥public static final String key = "**********";   //必填//小程序IDpublic static final String appID = "**********";    //必填//小程序密钥public static final String secret = "";//小程序退款Api路径public static final String REFUND_PATH = "https://api.mch.weixin.qq.com/secapi/pay/refund";//商户证书文件安装路径(详见 https://pay.weixin.qq.com/wiki/doc/api/wxa/wxa_api.php?chapter=4_3)public static final String CERT_PATH = "/Users/cheyuhang/Desktop/********";      //必填，证书路径public static final String CODE_SUCCESS = "000";public static final String CODE_ERROR = "999";public static final String MSG_NULL = "无效的订单";public static final String MSG_01 = "签名错误";public static final String REFUND_SUCCESS = "退款成功!";
}

具体业务逻辑实现

package myst.yynz.back.controller;import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import myst.yynz.back.bean.Msg;
import myst.yynz.back.log.Operation;
import myst.yynz.back.util.Constants;
import myst.yynz.back.util.PayUtil;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.config.RequestConfig;
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.apache.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;import javax.net.ssl.SSLContext;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.KeyStore;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;
import java.util.UUID;/*** @author cheyuhang on 2021/7/14*/
@Controller
@Api(tags = "微信支付退款")
@RequestMapping(value = "/pay")
public class WxPayController {private static final Logger LOGGER = Logger.getLogger(WxPayController.class);private  int socketTimeout = 10000;// 连接超时时间，默认10秒private  int connectTimeout = 30000;// 传输超时时间，默认30秒private  static RequestConfig requestConfig;// 请求器的配置private  static CloseableHttpClient httpClient;// HTTP请求器@ApiOperation(value = "查看所有商品评价进行分页展示")@CrossOrigin(allowCredentials = "true")@GetMapping(value="/refund")@Operation@ResponseBody //返回jsonpublic Msg refund() throws Exception {/*** 1547621181* https://api.mch.weixin.qq.com/secapi/pay/refund*/Map<String, String> data = new HashMap<>();String nonce_str = getRandomStringByLength(32);data.put("appid", Constants.appID);data.put("mch_id", Constants.MCH_ID);data.put("nonce_str", nonce_str);data.put("sign_type", "MD5");data.put("out_trade_no","SHOPZDJ1626244934861ogym" );//商户订单号,也就是下订单时的订单号data.put("out_refund_no", getRandomStringByLength(20));//商户退款单号Math.round(0.01 * 100);data.put("total_fee",String.valueOf(Math.round(0.01 * 100)));//支付金额，微信支付提交的金额是不能带小数点的，且是以分为单位,这边需要转成字符串类型，否则后面的签名会失败data.put("refund_fee", String.valueOf(Math.round(0.01 * 100)));//退款总金额,订单总金额,单位为分,只能为整数String preStr = PayUtil.createLinkString(data); // 把数组所有元素，按照“参数=参数值”的模式用“&”字符拼接成字符串//MD5运算生成签名，这里是第一次签名，用于调用统一下单接口String mySign = PayUtil.sign(preStr, Constants.key, "utf-8").toUpperCase();data.put("sign",mySign);//拼接统一下单接口使用的xml数据，要将上一步生成的签名一起拼接进去String xmlStr = postData(Constants.REFUND_PATH, PayUtil.GetMapToXML(data)); //支付结果通知的xml格式数据System.out.println(xmlStr);Map notifyMap = PayUtil.doXMLParse(xmlStr);return Msg.success().add("data",notifyMap);}private  String getRandomStringByLength(int length) {String base = "abcdefghijklmnopqrstuvwxyz0123456789";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();}/*** 加载证书**/private static void initCert() throws Exception {// 证书密码，默认为商户IDString key = Constants.MCH_ID;// 商户证书的路径String path = Constants.CERT_PATH;// 指定读取证书格式为PKCS12KeyStore keyStore = KeyStore.getInstance("PKCS12");// 读取本机存放的PKCS12证书文件FileInputStream instream = new FileInputStream(new File(path));try {// 指定PKCS12的密码(商户ID)keyStore.load(instream, key.toCharArray());} finally {instream.close();}SSLContext sslcontext = SSLContexts.custom().loadKeyMaterial(keyStore, key.toCharArray()).build();// 指定TLS版本SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslcontext, new String[] { "TLSv1" }, null,SSLConnectionSocketFactory.BROWSER_COMPATIBLE_HOSTNAME_VERIFIER);// 设置httpclient的SSLSocketFactoryhttpClient = HttpClients.custom().setSSLSocketFactory(sslsf).build();}/*** 通过Https往API post xml数据* @param url  API地址* @param xmlObj   要提交的XML数据对象* @return*/public  String postData(String url, String xmlObj) {// 加载证书try {initCert();} catch (Exception e) {e.printStackTrace();}String result = null;HttpPost httpPost = new HttpPost(url);// 得指明使用UTF-8编码，否则到API服务器XML的中文不能被成功识别StringEntity postEntity = new StringEntity(xmlObj, "UTF-8");httpPost.addHeader("Content-Type", "text/xml");httpPost.setEntity(postEntity);// 根据默认超时限制初始化requestConfigrequestConfig = RequestConfig.custom().setSocketTimeout(socketTimeout).setConnectTimeout(connectTimeout).build();// 设置请求器的配置httpPost.setConfig(requestConfig);try {HttpResponse response = null;try {response = httpClient.execute(httpPost);}  catch (IOException e) {e.printStackTrace();}HttpEntity entity = response.getEntity();try {result = EntityUtils.toString(entity, "UTF-8");}  catch (IOException e) {e.printStackTrace();}} finally {httpPost.abort();}return result;}
}

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微信退款简单实现(复制代码就能在本地运行实现)

小程序微信支付工具类(新手无需看懂，CV就行)

常量类(主要存放微信小程序的相关参数)

具体业务逻辑实现

微信退款简单实现(复制代码就能在本地运行实现)相关推荐

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