最近公司财务爸爸提需求，把三个支付退款api集成到公司系统里面去，由于之前api文档看的不够仔细，遇到很多坑，特此记录，分享给同样遇到坑的小伙伴：

商户能提供的是
appid 你的appid 也就是对于微信来说的唯一标示
appsecret 通过你的微信商户号进入就可以看到一个32位加密
key 商户的秘钥这秘钥不是一开始就有的。需要你自己去设置，在设置的时候还需要与本商户号绑定的手机发下验证码
mchid 商户id不解释

强烈建议仔细阅读，微信和支付宝的开发文档可以避免少踩很多坑；

微信app开发文档地址：https://pay.weixin.qq.com/wiki/doc/api/app/app.php?chapter=9_4&index=6

微信jsapi开发文档地址：https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_4

支付宝退款文档地址：https://docs.open.alipay.com/api_1/alipay.trade.refund

支付宝相关参数获取页面：

微信证书及apiKey获取页面：

1.微信jsapi退款、微信app退款：两个接口看官方文档参数基本一致，不同在于商户号（mch_id）、商户秘钥（API_KEY）、应用id即微信标识（APPID）

import com.cdy.common.util.DisconfDataGetter;
import com.cdy.common.util.MD5Util;
import com.cdy.lx.common.constant.CommonConstant;
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.slf4j.Logger;
import org.slf4j.LoggerFactory;import javax.net.ssl.SSLContext;
import java.io.*;
import java.math.BigDecimal;
import java.security.KeyStore;
import java.security.MessageDigest;
import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;import static java.lang.System.out;/*** @author liuxue* @ClassName WxPayRefundUtil* @ProjectName cdy-ccb* @Description: TODO  微信退款工具类* @date 2019/5/20 0020上午 10:35* @Version 1.0*/
public class WxPayRefundUtil {private static final Logger LOGGER = LoggerFactory.getLogger(WxPayRefundUtil.class);//微信appid （注*以下配置文件，我是使用百度的分布式配置文件配置，实际替换成你们自己的配置）private static final String WX_APPID = (String) DisconfDataGetter.getByFileItem("wxconfig.properties", "AppID");//微信商户号private static final String WX_MCH_ID = (String) DisconfDataGetter.getByFileItem("wxconfig.properties", "WX_MCH_ID");//微信api秘钥private static final String API_KEY = (String) DisconfDataGetter.getByFileItem("wxconfig.properties", "WECHAT_MCH_SECRET");//环境版本控制（1表示测试环境，2表示生产环境）private static final String VERSION_CONTRO = (String) DisconfDataGetter.getByFileItem("wxconfig.properties", "VERSION_CONTRO");//微信公众号支付退款回调地址private static final String WX_REFUND_NOTIFY_URL = (String) DisconfDataGetter.getByFileItem("wxconfig.properties", "WX_REFUND_NOTIFY_URL");//微信app支付退款回调地址private static final String WX_APP_REFUND_NOTIFY_URL = (String) DisconfDataGetter.getByFileItem("wxconfig.properties", "WX_APP_REFUND_NOTIFY_URL");/*** @param out_trade_no   商户订单号* @param transaction_id 微信订单号* @param total_fee      订单总金额* @Author: liux* @Description:微信退款* @Date: 2019/5/20 0020上午 10:35* @return:*/private static String wxPayRefund(String refund_account,String notify_url ,String refundNum,String out_trade_no, String transaction_id, String total_fee,String appId,String mchId,String apiKey) {StringBuffer xml = new StringBuffer();String data = null;try {String nonceStr = genNonceStr();//生成32位随机字符串xml.append("</xml>");Map<String, Object> parameters = new HashMap<>();parameters.put("appid", appId);parameters.put("mch_id", mchId);parameters.put("nonce_str", nonceStr);parameters.put("out_trade_no", out_trade_no);if(transaction_id != null){parameters.put("transaction_id", transaction_id);}parameters.put("out_refund_no", refundNum);parameters.put("fee_type", "CNY");parameters.put("total_fee", total_fee);parameters.put("refund_fee", total_fee);parameters.put("op_user_id", mchId);parameters.put("notify_url", notify_url);parameters.put("refund_account", refund_account);parameters.put("sign", WechatPayUtil.getSign(parameters,apiKey)/*createSign(parameters, apiKey)*/);data = SortedMaptoXml(parameters);} catch (Exception e) {System.err.println(e.getMessage());return null;}return data;}/*** @param out_trade_no   商户订单号* @param transaction_id 微信订单号* @param total_fee      订单总金额* @param refund_fee     退款金额* @Author: liux* @Description:微信部分退款* @Date: 2019/5/20 0020上午 10:35* @return:*/private static String wxPayRefund(String refund_account,String notify_url ,String refundNum,String out_trade_no, String transaction_id, String total_fee, String refund_fee,String appId,String mchId,String apiKey) {StringBuffer xml = new StringBuffer();String data = null;try {String nonceStr = genNonceStr();//生成32位随机字符串xml.append("</xml>");Map<String, Object> parameters = new HashMap<>();parameters.put("appid", appId);parameters.put("mch_id", mchId);parameters.put("nonce_str", nonceStr);parameters.put("out_trade_no", out_trade_no);if(transaction_id != null){parameters.put("transaction_id", transaction_id);}parameters.put("out_refund_no", refundNum);parameters.put("fee_type", "CNY");parameters.put("total_fee", total_fee);parameters.put("refund_fee", refund_fee);//部退款金额parameters.put("op_user_id", mchId);parameters.put("notify_url", notify_url);parameters.put("refund_account", refund_account);//仅针对老资金流商户使用REFUND_SOURCE_UNSETTLED_FUNDS---未结算资金退款（默认使用未结算资金退款）REFUND_SOURCE_RECHARGE_FUNDS---可用余额退款parameters.put("sign", WechatPayUtil.getSign(parameters,apiKey)/*createSign(parameters, apiKey)*/);data = SortedMaptoXml(parameters);} catch (Exception e) {System.err.println(e.getMessage());return null;}return data;}/*** 生成32位随机数字*/public static String genNonceStr() {Random random = new Random();return MD5Util.MD5(String.valueOf(random.nextInt(10000)));}/*** @param characterEncoding* @param parameters* @Author: liux* @Description:支付参数生成签名* @Date: 2019/5/20 0020上午 10:35*/public static String createSign(String characterEncoding, SortedMap<Object, Object> parameters) {StringBuffer sb = new StringBuffer();Set es = parameters.entrySet();//所有参与传参的参数按照accsii排序（升序）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);String sign = MD5Encode(sb.toString(), characterEncoding).toUpperCase();return sign;}/*** 创建md5摘要,规则是:按参数名称a-z排序,遇到空值的参数不参加签名。*/public static String createSign(SortedMap<String, String> packageParams, String AppKey) {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=" + AppKey);String sign = MD5Util.MD5Encode(sb.toString()).toUpperCase();return sign;}/*** @param params* @Author: liux* @Description:请求值转换为xml格式 SortedMap转xml* @Date:2019/5/20 0020上午 10:35*/private static String SortedMaptoXml(Map<String, Object> params) {StringBuilder sb = new StringBuilder();Set es = params.entrySet();Iterator it = es.iterator();sb.append("<xml>\n");while (it.hasNext()) {Map.Entry entry = (Map.Entry) it.next();String k = (String) entry.getKey();Object v = entry.getValue();sb.append("<" + k + ">");sb.append(v);sb.append("</" + k + ">\n");}sb.append("</xml>");return sb.toString();}/*** 生成 MD5** @param data 待处理数据* @return MD5结果*/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();}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()));elseresultString = byteArrayToHexString(md.digest(resultString.getBytes(charsetname)));} catch (Exception exception) {}return resultString;}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];}private static final String hexDigits[] = {"0", "1", "2", "3", "4", "5","6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};/*** 证书使用* 微信退款*/private static String wxPayBack(String url, String data,String fileName,String mchId) throws Exception {KeyStore keyStore  = KeyStore.getInstance("PKCS12");
//        FileInputStream instream = new FileInputStream(new File("F:\\wx\\apiclient_cert.p12"));//FileInputStream instream=(FileInputStream)inputStream;String result="";InputStream inputStream = inputStream =new FileInputStream(new File(fileName));if(inputStream == null){return result;}try {keyStore.load(inputStream, mchId.toCharArray());} finally {inputStream.close();}// Trust own CA and all self-signed certsSSLContext sslcontext = SSLContexts.custom().loadKeyMaterial(keyStore, mchId.toCharArray()).build();// Allow TLSv1 protocol onlySSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslcontext,new String[] { "TLSv1" },null,SSLConnectionSocketFactory.BROWSER_COMPATIBLE_HOSTNAME_VERIFIER);CloseableHttpClient httpclient = HttpClients.custom().setSSLSocketFactory(sslsf).build();try {HttpPost httppost = new HttpPost("https://api.mch.weixin.qq.com/secapi/pay/refund");StringEntity entitys = new StringEntity(data);httppost.setEntity((HttpEntity) entitys);CloseableHttpResponse response = httpclient.execute(httppost);try {HttpEntity entity = response.getEntity();if (entity != null) {BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(entity.getContent()));String text="";String t="";while ((text=bufferedReader.readLine()) != null) {t+=text;}byte[] temp=t.getBytes("utf-8");//这里写原编码方式String newStr=new String(temp);//这里写转换后的编码方式result=newStr;}EntityUtils.consume(entity);} finally {response.close();}} finally {httpclient.close();}return result;}/*** @Description: 退款接口 供外部调用* @param ${refundNum} :商户退款${source} :订单来源(微信公众号或者app微信)* @param ${out_trade_no} :商户订单号 ${transaction_id} :微信平台订单号* @param ${total_fee} :订单金额 ${refund_fee} :退费金额* @param ${refund_account} 退费钱包（默认未结算金额退款）* @return ${return_type} * @throws* @author liuxue* @date 2019/5/24 0024 下午 3:30 */public static Map<String,String> wxRefund(String refundNum,String source,String out_trade_no, String transaction_id, BigDecimal total_fee, BigDecimal refund_fee,String refund_account) {String param = "" ;String appId = "";String mchId = "";String apiKey = "";String notifyUrl = "";String totalAmount = String.valueOf(Double.valueOf(total_fee.multiply(BigDecimal.valueOf(100)).toString()).intValue());String refundAmount = String.valueOf(Double.valueOf(refund_fee.multiply(BigDecimal.valueOf(100)).toString()).intValue());if("app".equals(source)){appId = CommonConstant.OPEN_WECHAT_APPID;mchId = CommonConstant.OPEN_WECHAT_MCHID;apiKey = CommonConstant.OPEN_WECHAT_MCH_SECRET;notifyUrl = WX_APP_REFUND_NOTIFY_URL;//退款通知回调地址}else{appId = WX_APPID;mchId = WX_MCH_ID;apiKey = API_KEY;notifyUrl = WX_REFUND_NOTIFY_URL;//退款通知回调地址}String fileName = ProjectPathUtil.getRootPath("/refundceat/test_wx_apiclient_cert.p12");if(VERSION_CONTRO!=null && "2".equals(VERSION_CONTRO)){//2表示生产环境fileName = ProjectPathUtil.getRootPath("/refundceat/wx_apiclient_cert.p12");}if ("app".equals(source)){fileName = ProjectPathUtil.getRootPath("/refundceat/wx_app_apiclient_cert.p12");}if(total_fee.subtract(refund_fee).compareTo(BigDecimal.valueOf(0))==0){LOGGER.info("微信|退款|单号|"+out_trade_no+"|全额退款:请求参数out_trade_no:"+out_trade_no+":transaction_id:"+transaction_id+":total_fee:"+total_fee+":refund_fee:"+refund_fee);param = wxPayRefund(refund_account,notifyUrl,refundNum,out_trade_no,transaction_id,totalAmount,appId,mchId,apiKey);}else{LOGGER.info("微信|退款|单号|"+out_trade_no+"|微信部分退款:请求参数out_trade_no:"+out_trade_no+":transaction_id:"+transaction_id+":total_fee:"+total_fee+":refund_fee:"+refund_fee);param = wxPayRefund(refund_account,notifyUrl,refundNum,out_trade_no,transaction_id,totalAmount,refundAmount,appId,mchId,apiKey);}LOGGER.info("微信|退款|单号|"+out_trade_no+"|请求xml|"+param);String result = "";String url = "https://api.mch.weixin.qq.com/secapi/pay/refund";try {result = wxPayBack(url, param,fileName,mchId);LOGGER.info("微信|退款|单号|"+out_trade_no+"|返回结果"+result);Map<String,String> map = WechatPayUtil.getMapStringFromXML(result);return map;} catch (Exception e) {e.printStackTrace();LOGGER.error("微信|退款|单号|"+out_trade_no+"|出错",e);}return null;}}

上面的代码，我遇到过一个问题，就是maven编译打包会把2进制这种证书文件给改变，导致证书不可用的问题，可以在maven打包中
过滤证书文件不编译，添加一下配置即可，（实际生产环境可能会与到路径不对，无法读取证书问题，这个就没法给一个公用的解决方案了，
只能具体情况，自己去特殊处理了）：


<nonFilteredFileExtensions><nonFilteredFileExtension>p12</nonFilteredFileExtension>
</nonFilteredFileExtensions>

WechatPayUtil工具类

import com.cdy.common.util.MD5Util;
import com.fasterxml.jackson.databind.JsonNode;
import com.google.common.base.Splitter;
import com.google.common.collect.Maps;
import org.apache.log4j.Logger;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;import javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URLEncoder;
import java.util.*;import static java.lang.System.out;/*** 微信支付签名算法** @author liux* @since 2019-05-15 14:38*/
public class WechatPayUtil {private static Logger log = Logger.getLogger(WechatPayUtil.class);public static String getSign(Map<String, Object> map, String mch_secret) {ArrayList<String> list = new ArrayList<String>();for (Map.Entry<String, Object> entry : map.entrySet()) {if (!"".equals(entry.getValue()) && entry.getValue() != null) {list.add(entry.getKey() + "=" + entry.getValue() + "&");}}int size = list.size();String[] arrayToSort = list.toArray(new String[size]);Arrays.sort(arrayToSort, String.CASE_INSENSITIVE_ORDER);StringBuilder sb = new StringBuilder();for (int i = 0; i < size; i++) {sb.append(arrayToSort[i]);}String result = sb.toString();result += "key=" + mch_secret;log.debug("before sign:" + result);result = MD5Util.MD5Encode(result).toUpperCase();log.debug("after sign:" + result);return result;}}Md5util工具类：import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Date;import org.apache.commons.codec.digest.DigestUtils;/***/
public class MD5Util {private static final char[] hexDigest = new char[]{'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};private final static String[] hexDigits = {"0", "1", "2", "3", "4", "5", "6", "7","8", "9", "a", "b", "c", "d", "e", "f"};public final static String MD5(String content) {//用于加密的字符char md5String[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9','A', 'B', 'C', 'D', 'E', 'F'};try {//使用平台的默认字符集将此 String 编码为 byte序列，并将结果存储到一个新的 byte数组中byte[] btInput = content.getBytes();//信息摘要是安全的单向哈希函数，它接收任意大小的数据，并输出固定长度的哈希值。MessageDigest mdInst = MessageDigest.getInstance("MD5");//MessageDigest对象通过使用 update方法处理数据， 使用指定的byte数组更新摘要mdInst.update(btInput);// 摘要更新之后，通过调用digest（）执行哈希计算，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++) {   //  i = 0byte byte0 = md[i];  //95str[k++] = md5String[byte0 >>> 4 & 0xf];    //    5str[k++] = md5String[byte0 & 0xf];   //   F}//返回经过加密后的字符串return new String(str);} catch (Exception e) {return null;}}/*** * @Description: 生成member的token* @param id* @param mobilePhone* @param password* @return    * String  * @author liux* @date 2017年10月16日*/public static String generateToken(Long id, String mobilePhone, String password) {StringBuilder sb = new StringBuilder();sb.append(id);sb.append(mobilePhone);sb.append(password);sb.append(new Date().toString());//生成tokenreturn md5(sb.toString());}public static String md5(String content) {try {//1.创建消息摘要实例MessageDigest md = MessageDigest.getInstance("MD5");//2.获取待加密内容的字节数组byte[] contentB = content.getBytes();//3.使用指定的字节更新摘要md.update(contentB);//4.加密byte[]  newContent = md.digest();//长度为16的字节数组//5.将加密后的16位字节数组转换为32位十六进制数字int k=0;char[] contentC = new char[newContent.length * 2];for(int  i=0;i<newContent.length;i++){byte b = newContent[i];contentC[k++] = hexDigest[b >>> 4 & 0xf];   //高四位contentC[k++] = hexDigest[b & 0xf];              //低四位}return  new String(contentC);} catch (NoSuchAlgorithmException e) {e.printStackTrace();return null;}}/*** MD5编码* @param origin 原始字符串* @return 经过MD5加密之后的结果*/public static String MD5Encode(String origin) {String resultString = null;try {resultString = origin;MessageDigest md = MessageDigest.getInstance("MD5");resultString = byteArrayToHexString(md.digest(resultString.getBytes("utf-8")));} catch (Exception e) {e.printStackTrace();}return resultString;}/*** 转换字节数组为16进制字串* @param b 字节数组* @return 16进制字串*/public static String byteArrayToHexString(byte[] b) {StringBuilder resultSb = new StringBuilder();for (byte aB : b) {resultSb.append(byteToHexString(aB));}return resultSb.toString();}/*** 转换byte到16进制* @param b 要转换的byte* @return 16进制格式*/private static String byteToHexString(byte b) {int n = b;if (n < 0) {n = 256 + n;}int d1 = n / 16;int d2 = n % 16;return hexDigits[d1] + hexDigits[d2];}/*** * @Description: * @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* String  * @author liux* @date 2017年11月8日*/public static String sign(String text, String key, String input_charset) {text = text + key;System.out.println(text);return DigestUtils.md5Hex(getContentBytes(text, input_charset));}private 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);}}public static String md5Str(String str){if (str == null)return "";return md5Str(str, 0);}/*** 计算消息摘要。* @param data 计算摘要的数据。* @param offset 数据偏移地址。* @param length 数据长度。* @return 摘要结果。(16字节)*/public static String md5Str(String str, int offset){try{MessageDigest md5 = MessageDigest.getInstance("MD5");byte[] b = str.getBytes("UTF8");md5.update(b, offset, b.length);return byteArrayToHexString(md5.digest());}catch (NoSuchAlgorithmException ex){ex.printStackTrace();return null;}catch (UnsupportedEncodingException ex){ex.printStackTrace();return null;}}}

支付宝退款相关代码，这里有点注意的，代码里面用到的私钥和公钥，如果不知道可以去对应的支付宝商户平台上去查看，还有加密的方式是使用的“RSA”还是“RSA2”可以去上商户平台上查看，这个写错也是无法退款的：

引入sdk

<dependency><groupId>com.alipay</groupId><artifactId>sdk-java</artifactId><version></version>
</dependency>

AlipayRefundUtil

import com.alipay.api.AlipayClient;
import com.alipay.api.DefaultAlipayClient;
import com.alipay.api.domain.AlipayTradeRefundModel;
import com.alipay.api.request.AlipayTradeRefundRequest;
import com.alipay.api.response.AlipayTradeRefundResponse;
import com.cdy.common.util.DisconfDataGetter;
import com.cdy.common.util.JSONUtil;
import com.cdy.lx.common.constant.CommonConstant;
import org.apache.commons.lang3.RandomStringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;import java.math.BigDecimal;/*** @author liux* @ClassName AlipayRefundUtil* @ProjectName cdy-ccb* @Description: TODO* @date 2019/5/20 0020上午 10:05* @Version 1.0*/
public class AlipayRefundUtil {private static final Logger LOGGER = LoggerFactory.getLogger(AlipayRefundUtil.class);//支付宝退款请求的网关private static String requestUrl = "https://openapi.alipay.com/gateway.do";//编码级别private static String CHARSET = "UTF-8";public static AlipayTradeRefundResponse refundOrder(String out_trade_no, String refundAmount){System.out.println("开始调用支付宝加密。。。");//实例化客户端AlipayClient alipayClient = new DefaultAlipayClient(requestUrl, CommonConstant.APP_ID, CommonConstant.APP_PRIVATE_KEY, "json", CHARSET, CommonConstant.ALIPAY_PUBLIC_KEY, "RSA");//SDK已经封装掉了公共参数，这里只需要传入业务参数。以下方法为sdk的model入参方式(model和biz_content同时存在的情况下取biz_content)。AlipayTradeRefundModel refundModel = new AlipayTradeRefundModel();//refundModel.setTradeNo(trade_no);refundModel.setOutTradeNo(out_trade_no);refundModel.setRefundAmount(refundAmount);refundModel.setRefundReason("商品退款");//实例化具体API对应的request类,类名称和接口名称对应,当前调用接口名称：alipay.trade.app.payAlipayTradeRefundRequest request = new AlipayTradeRefundRequest();request.setBizModel(refundModel);try{AlipayTradeRefundResponse response = alipayClient.execute(request);LOGGER.info("支付宝|退款|单号|"+out_trade_no+"|返回结果"+ JSONUtil.toJson(response));return response;}catch(Exception e){e.printStackTrace();LOGGER.error("支付宝退款错误！",e.getMessage());                    }      return null;}/**  支付宝退款接口(部分退款)* @param out_trade_no 订单支付时传入的商户订单号,不能和支付宝交易号（trade_no）同时为空。* @param trade_no 支付宝交易号* @param refund_amount 需要退款的金额，该金额不能大于订单金额,单位为元，支持两位小数* @return 将提示信息返回*/public synchronized static AlipayTradeRefundResponse alipayRefundRequest(String out_trade_no,String trade_no,BigDecimal refund_amount,String out_request_no) {String returnStr = null;try {LOGGER.info("支付宝|退款|单号|"+out_trade_no+"申请退款:请求参数out_trade_no:"+out_trade_no+":trade_no:"+trade_no+":refund_amount:"+refund_amount);AlipayClient alipayClient = new DefaultAlipayClient(requestUrl,CommonConstant.APP_ID, CommonConstant.APP_PRIVATE_KEY,"JSON", CHARSET, CommonConstant.ALIPAY_PUBLIC_KEY, "RSA");AlipayTradeRefundRequest request = new AlipayTradeRefundRequest();request.setBizContent("{" +"\"out_trade_no\":\"" + out_trade_no + "\"," +"\"trade_no\":\"" + trade_no + "\"," +"\"refund_amount\":\"" + refund_amount + "\"," +"\"out_request_no\":\"" + out_request_no+ "\"," +"\"refund_reason\":\"正常退款\"" +" }");AlipayTradeRefundResponse response;response = alipayClient.execute(request);LOGGER.info("支付宝|退款|单号|"+out_trade_no+"|返回结果"+ JSONUtil.toJson(response));return response;} catch (Exception e) {e.printStackTrace();LOGGER.error("支付宝|退款|单号|"+out_trade_no+"|出错",e);}return null;}
}

遇到过的错误：

1.java.security.InvalidKeyException: Illegal key size or default parameters

参考https://blog.csdn.net/cl11992/article/details/86703694 （我这边是测试环境linux jdk 1.8.0 151遇到的，通过升级jdk版本解决）

2.DER input, Integer tag error （测试环境遇到的错误，好像是秘钥配置问题，秘钥一定要和证书对应）

3.{"code":"40003","msg":"Insufficient Conditions","sub_code":"isv.missing-signature-config","sub_msg":"验签出错, 未配置对应签名算法的公钥或者证书"}（这种问题，都是支付宝的秘钥配置不正确）

4.微信退款返回签名错误（这种问题也是秘钥和证书不一致，（商户秘钥不是微信公众平台上面配置的秘钥））

浦发相关的代码就不贴了，有不清楚的可以问题；

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微信公众号退款，app微信退款，支付宝退款，浦发退款

1.java.security.InvalidKeyException: Illegal key size or default parameters

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