微信支付v3版

wxpay22-07-06_18-28-06

微信支付官方地址

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https://pay.weixin.qq.com/index.php/core/home/login?return_url=%2F

1.依赖

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// https://mvnrepository.com/artifact/com.github.wechatpay-apiv3/wechatpay-apache-httpclient
   implementation group: 'com.github.wechatpay-apiv3', name: 'wechatpay-apache-httpclient', version: '0.2.2'
   // https://mvnrepository.com/artifact/com.github.wxpay/wxpay-sdk
   implementation group: 'com.github.wxpay', name: 'wxpay-sdk', version: '0.0.3'

2.需要准备的材料

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public class WxPayConstant {

    //wx商家号
    private String wxMerchantId;

    //wxAppid
    private String wxAppId;

    //wx私钥
    private String wxPrivateKey;

    //wx apiV3key
    private String wxApiKey;

  
    //wx证书序列号
    private String wxCertSerialNo;
}

3.代码示例

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package cn.bodor.order.utils;

import cn.bodor.order.exception.BusinessException;
import com.alibaba.fastjson.JSONObject;
import com.wechat.pay.contrib.apache.httpclient.WechatPayHttpClientBuilder;
import com.wechat.pay.contrib.apache.httpclient.auth.*;
import com.wechat.pay.contrib.apache.httpclient.util.PemUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.http.HttpEntity;
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.message.BasicHeader;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.security.PrivateKey;

@Slf4j
public class WxpayUtils {

    public static Verifier verifier;
    public static CloseableHttpClient httpClient;

    public static JSONObject wxPayPost(String url, String data, String mchId, String serialNo, String privateKey, String apiv3) {
        try {
            // 加载商户私钥（privateKey：私钥字符串）
            PrivateKey merchantPrivateKey = PemUtil.loadPrivateKey(
                    new ByteArrayInputStream(privateKey.getBytes("utf-8")));
            //使用自动更新的签名验证器，不需要传入证书
            verifier = new AutoUpdateCertificatesVerifier(
                    new WechatPay2Credentials(mchId, new PrivateKeySigner(serialNo, merchantPrivateKey)),
                    apiv3.getBytes("utf-8"));

            httpClient = WechatPayHttpClientBuilder.create()
                    .withMerchant(mchId, serialNo, merchantPrivateKey)
                    .withValidator(new WechatPay2Validator(verifier))
                    .build();
            HttpPost httpPost = new HttpPost(url);
            httpPost.setHeader("Content-type", "application/json");
            httpPost.setHeader("Accept", "application/json");
            StringEntity entity = new StringEntity(data, "UTF-8");
            entity.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE,
                    "application/json"));
            httpPost.setEntity(entity);
            CloseableHttpResponse response = httpClient.execute(httpPost);
            log.error("微信接口result状态码----code:{}",response.getStatusLine().getStatusCode());
            if (response.getStatusLine().getStatusCode() != 200) {
                throw new BusinessException("微信接口调用失败!");
            }
            HttpEntity entity2 = response.getEntity();
            EntityUtils.consume(entity2);
            JSONObject jsonObject = JSONObject.parseObject(EntityUtils.toString(response.getEntity()));
            log.info("微信接口调用成功----json:{}", jsonObject);
            return jsonObject;
        } catch (Exception e) {
            log.error("调起微信接口出现问题----message:{}" + e.getMessage());
            throw new BusinessException("微信接口调用失败!");
        } finally {
            try {
                httpClient.close();
            } catch (IOException e) {
                log.error("微信接口关闭资源报错----message:{}" + e.getMessage());
                throw new BusinessException("微信接口关闭资源报错!");
            }
        }
    }
}

如果返回400 Bad，用下面的postman工具测试参数

https://github.com/wechatpay-apiv3/wechatpay-postman-script