本文推荐一个拿来即用Gitee标星14.2k的微信开发工具WxJava。WxJava - 微信开发 Java SDK，支持微信支付、开放平台、公众号、企业号/企业微信、小程序等的后端开发。

引入maven依赖：

<dependency>
  <groupId>com.github.binarywang</groupId>
  <artifactId>weixin-java-mp</artifactId>
  <version>${weixin-java-mp.version}</version>
</dependency>

<!--微信支付-->
<dependency>
  <groupId>com.github.binarywang</groupId>
  <artifactId>weixin-java-pay</artifactId>
  <version>${weixin-java-mp.version}</version>
</dependency>

<dependency>
  <groupId>com.github.binarywang</groupId>
  <artifactId>weixin-java-common</artifactId>
  <version>${weixin-java-mp.version}</version>
</dependency>

<!--微信小程序-->
<dependency>
  <groupId>com.github.binarywang</groupId>
  <artifactId>weixin-java-miniapp</artifactId>
  <version>${weixin-java-mp.version}</version>
</dependency>

配置：

yml文件

配置1.jpg

config类

package com.api.activity.config;

import com.github.binarywang.wxpay.config.WxPayConfig;
import com.github.binarywang.wxpay.service.WxPayService;
import com.github.binarywang.wxpay.service.impl.WxPayServiceImpl;
import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * 微信支付自动配置类
 * @author TangChao
 * @create 2022/08/11
 */
@Slf4j
@Configuration
@AllArgsConstructor
@EnableConfigurationProperties({WxPayProperties.class})
public class WxAutoConfiguration {

    private WxPayProperties payProperties;


    @Bean
    @ConditionalOnMissingBean
    @ConditionalOnClass(WxPayService.class)
    public WxPayService wxService() {
        WxPayConfig payConfig = new WxPayConfig();
        payConfig.setAppId(StringUtils.trimToNull(this.payProperties.getAppId()));
        payConfig.setMchId(StringUtils.trimToNull(this.payProperties.getMchId()));
        payConfig.setMchKey(StringUtils.trimToNull(this.payProperties.getMchKey()));
        payConfig.setSubAppId(StringUtils.trimToNull(this.payProperties.getSubAppId()));
        payConfig.setSubMchId(StringUtils.trimToNull(this.payProperties.getSubMchId()));
        payConfig.setKeyPath(StringUtils.trimToNull(this.payProperties.getKeyPath()));
        // v3
        payConfig.setApiV3Key(StringUtils.trimToNull(this.payProperties.getApiV3Key()));
        payConfig.setCertSerialNo(StringUtils.trimToNull(this.payProperties.getCertSerialNo()));
        payConfig.setPrivateCertPath(StringUtils.trimToNull(this.payProperties.getPrivateCertPath()));
        payConfig.setPrivateKeyPath(StringUtils.trimToNull(this.payProperties.getPrivateKeyPath()));
        payConfig.setNotifyUrl(StringUtils.trimToNull(this.payProperties.getNotifyURL()));


        //不使用沙箱环境
        payConfig.setUseSandboxEnv(false);

        WxPayService wxPayService = new WxPayServiceImpl();
        wxPayService.setConfig(payConfig);
        log.info("微信PAY init");
        return wxPayService;
    }

}

配置实例

package com.api.activity.config;

import lombok.Data;
import lombok.ToString;
import org.springframework.boot.context.properties.ConfigurationProperties;

@Data
@ToString
@ConfigurationProperties(prefix = "wx.pay")
public class WxPayProperties {
  /**
   * 设置微信公众号或者小程序等的appid
   */
  private String appId;

  /**
   * 匠要公众号密钥
   */
  private String appSecret;

  /**
   * 微信支付商户号
   */
  private String mchId;

  /**
   * 微信支付商户密钥
   */
  private String mchKey;

  /**
   * 服务商模式下的子商户公众账号ID，普通模式请不要配置，请在配置文件中将对应项删除
   */
  private String subAppId;

  /**
   * 服务商模式下的子商户号，普通模式请不要配置，最好是请在配置文件中将对应项删除
   */
  private String subMchId;

  /**
   * apiclient_cert.p12文件的绝对路径，或者如果放在项目中，请以classpath:开头指定
   */
  private String keyPath;


  private String apiV3Key;


  private String certSerialNo;


  private String privateKeyPath;


  private String privateCertPath;

  /**
   * 回调地址
   */
  private String notifyURL;



}