1.将p12证书转为pem证书，得到商户私钥

openssl pkcs12 -in apiclient_cert.p12 -out apiclient_cert.pem -nodes

密码是：商户id

2.将获取到的apiclient_cert.pem证书，复制出这一块内容，其他的不要

3.下载这个工具包

https://github.com/wechatpay-apiv3/CertificateDownloader

4.在test包中运行

生成证书

5.引入腾讯的sdk

https://github.com/wechatpay-apiv3/wechatpay-apache-httpclient

<dependency><groupId>com.github.wechatpay-apiv3</groupId><artifactId>wechatpay-apache-httpclient</artifactId><version>0.2.2</version></dependency>

6.测试示例

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.wechat.pay.contrib.apache.httpclient.WechatPayHttpClientBuilder;
import com.wechat.pay.contrib.apache.httpclient.util.PemUtil;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.util.EntityUtils;import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.List;public class test {public static void main(String[] args) throws Exception {String apiV3key = "SYKJ20234545weasdq";// 商户号String mchId = "150923821451";// 商户证书序列号String mchSerialNo = "79D9A85662A93453457720657B19";// 商户私钥String mchPrivateKeyFilePath = "D:\\可删除\\apiclient_cert.pem";// 微信支付平台证书String wechatpayCertificateFilePath = "E:\\allrun2\\微信支付证书工具\\wechatpay_38023669B5DBFED58B2B16B3D38CA15DB983E002.pem";//下载成功后保存证书的路径String outputFilePath = "E:\\allrun2\\微信支付证书工具";//native统一下单String nativePay = "https://api.mch.weixin.qq.com/v3/pay/transactions/native";WechatPayHttpClientBuilder builder = WechatPayHttpClientBuilder.create().withMerchant(mchId, mchSerialNo, PemUtil.loadPrivateKey(new FileInputStream(mchPrivateKeyFilePath)));if (wechatpayCertificateFilePath == null) {//不做验签builder.withValidator(response -> true);} else {List<X509Certificate> certs = new ArrayList<>();certs.add(PemUtil.loadCertificate(new FileInputStream(wechatpayCertificateFilePath)));builder.withWechatpay(certs);}/*HttpGet httpGet = new HttpGet(CertDownloadPath);httpGet.addHeader("Accept", "application/json");try (CloseableHttpClient client = builder.build()) {CloseableHttpResponse response = client.execute(httpGet);int statusCode = response.getStatusLine().getStatusCode();String body = EntityUtils.toString(response.getEntity());if (statusCode == 200) {System.out.println("body:" + body);} else {System.out.println("download failed,resp code=" + statusCode + ",body=" + body);throw new IOException("request failed");}}*/HttpPost httpPost = new HttpPost(nativePay);httpPost.addHeader("Accept", "application/json");httpPost.addHeader("Content-type","application/json; charset=utf-8");ObjectMapper objectMapper = new ObjectMapper();ByteArrayOutputStream bos = new ByteArrayOutputStream();ObjectNode rootNode = objectMapper.createObjectNode();rootNode.put("mchid",mchId).put("appid", "wxf3152dbae1f27a61").put("description", "Ima5677公仔").put("notify_url", "http://2j9c780335.zicp.vip/siyu-cloud-pay-biz/pms/wechatPay/callback").put("out_trade_no", "515414244");rootNode.putObject("amount").put("total", 1);objectMapper.writeValue(bos, rootNode);httpPost.setEntity(new StringEntity(bos.toString("UTF-8")));try (CloseableHttpClient httpClient = builder.build()) {CloseableHttpResponse response = httpClient.execute(httpPost);String bodyAsString = EntityUtils.toString(response.getEntity());System.out.println(bodyAsString);}}
}