获取到appid、公私钥后，我们就可以进行开发环境的配置了。

<dependency>
    <groupId>com.alipay.sdk</groupId>
    <artifactId>alipay-sdk-java</artifactId>
    <version>4.22.0.ALL</version>
</dependency>

配置文件application.yml

ali:
  appid: 20210*****24906
  private-key: # 一般最长的是私钥
  alipay-public-key: # 支付宝的应用公钥
  notify-domain: https://xk857.mynatapp.cc # 你自己的回调地址，可以使用接口回调软件进行测试
  gateway-host: https://openapi.alipay.com #支付宝统一网关
  sign-type: RSA2 #加密方式
  return-domain: https://www.xk857.com #H5或其他方式支付成功支付宝自动跳转地址

读取配置文件信息

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;

@Data
@Configuration
@PropertySource("classpath:application.yml") 
@ConfigurationProperties(prefix = "ali")
public class AliPayConfig {

    private String appid;

    private String privateKey;

    private String alipayPublicKey;

    /**
     * 接收结果通知地址
     */
    private String notifyDomain;

    /**
     * 支付宝统一网关
     */
    private String gatewayHost;

    /**
     * 加密方式
     */
    private String signType;
    
    /**
     * H5或其他方式支付成功支付宝自动跳转地址
     */
    private String returnDomain;
}

将Client实例存入Bean中

import com.alipay.api.AlipayClient;
import com.alipay.api.DefaultAlipayClient;
import com.xk857.alipay.config.AliPayConfig;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;

@Component
public class AliPayClientBean {

    @Autowired
    private AliPayConfig aliPayConfig;

    @Bean
    public AlipayClient getAlipayClient() {
        return new DefaultAlipayClient(aliPayConfig.getGatewayHost(), aliPayConfig.getAppid(), aliPayConfig.getPrivateKey(), "json", "UTF-8", aliPayConfig.getAlipayPublicKey(), aliPayConfig.getSignType());
    }
}