spring boot 申请微信退款

一、需要API证书(apiclient_cert.p12证书的，在微信公众号上下载–注意PKCS12证书 是从微信商户平台-》账户设置-》 API安全 中下载的 。)

java用的是.12格式的证书

保存相关配置工具类

// 微信号,
public static String APP_ID = "";
// 应用对应的凭证
public static String APP_SECRET = "";
// 商户密钥
public static String API_KEY = "";
// 商业号
public static String MCH_ID = "";
//退款地址
public static String REFUND_URL= "";

//证书路径
public static String API_URL= "e:\apiclient_cert.p12";

退款类

package com.gxkj.gx.admin.service.controller;

import com.gxkj.gx.admin.service.utils.WXPayConstants;
import com.gxkj.gx.admin.service.utils.WXPayUtil;
import com.gxkj.gx.common.utils.PayConfig;
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 javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.security.KeyStore;
import java.util.*;
public class WxController extends WorkController{

    private static final Logger logger =  LoggerFactory.getLogger(WxController.class);

    /**
     * 申请微信退款
     * @param order
     * @param wxorder
     * @param money
     * @param sumMoney
     * @return
     */
    public static String wxReFund(String order,String wxorder,double money,double sumMoney) {
        try {
            Map<String, String> reqData = new HashMap<>();
            reqData.put("appid", PayConfig.APP_ID);
            reqData.put("mch_id", PayConfig.MCH_ID);
            reqData.put("nonce_str", WXPayUtil.generateNonceStr());//随机字符串
            reqData.put("sign_type", "MD5");
            reqData.put("transaction_id",wxorder);//付款微信订单号
            reqData.put("out_refund_no",order);//退款订单号

            Double price = money * 100;
            Double sumMoneys = sumMoney * 100;
            reqData.put("total_fee",  String.valueOf(sumMoneys.intValue()));//订单总金额，单位为分
            reqData.put("refund_fee",  String.valueOf(price.intValue()));//退款总金额，单位为分
            reqData.put("sign", WXPayUtil.generateSignature(reqData, PayConfig.API_KEY, WXPayConstants.SignType.MD5));
            //微信统一下单
            // 将所有参数转换为xml形式
            String xmlParam = WXPayUtil.mapToXml(reqData);
            String xmlStr = doRefund(REFUND_URL, xmlParam);

            Map<String, String> map = WXPayUtil.xmlToMap(xmlStr);
            if (map == null || !"SUCCESS".equals(map.get("return_code"))) {
                //消息通知
                System.out.println("-----退款发起失败-----"+map);
                return null;
            }else {//返回退款微信订单号
                return map.get("refund_id");
            }
        }catch (Exception e){
            e.printStackTrace();
        }
        return null;
    }
    /**
     * 申请退款
     */
    public static String doRefund(String url, String data) throws Exception {
        StringBuilder sb = new StringBuilder();
        try {
            KeyStore keyStore = KeyStore.getInstance("PKCS12");
           
            //证书
            FileInputStream instream = new FileInputStream(new File(API_URL));

            String mchid = PayConfig.MCH_ID;
            try {
                keyStore.load(instream, mchid.toCharArray());
            } finally {
                instream.close();
            }

            // 证书
            SSLContext sslcontext = SSLContexts.custom()
                    .loadKeyMaterial(keyStore, mchid.toCharArray())
                    .build();
            // 只允许TLSv1协议
            SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(
                    sslcontext,
                    new String[]{"TLSv1"},
                    null,
                    SSLConnectionSocketFactory.BROWSER_COMPATIBLE_HOSTNAME_VERIFIER);
            //创建基于证书的httpClient,后面要用到
            CloseableHttpClient client = HttpClients.custom()
                    .setSSLSocketFactory(sslsf)
                    .build();

            HttpPost httpPost = new HttpPost(url);//退款接口
            StringEntity reqEntity = new StringEntity(data);
            // 设置类型
            reqEntity.setContentType("application/x-www-form-urlencoded");
            httpPost.setEntity(reqEntity);
            CloseableHttpResponse response = client.execute(httpPost);
            try {
                HttpEntity entity = response.getEntity();
                System.out.println(response.getStatusLine());
                if (entity != null) {
                    BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(entity.getContent(), "UTF-8"));
                    String text = "";
                    while ((text = bufferedReader.readLine()) != null) {
                        sb.append(text);
                    }
                }
                EntityUtils.consume(entity);
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                try {
                    response.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
        return sb.toString();
    }

}