01-支付宝支付

官网地址：https://www.alipay.com/

沙箱环境：https://opendocs.alipay.com/open/200/105311

1. 封装二维码操作

QrCodeUtil-二维码生成与解析

2. 支付宝支付 Demo

2.1 依赖 jar

<!-- https://mvnrepository.com/artifact/com.alipay.sdk/alipay-sdk-java -->
<dependency>
    <groupId>com.alipay.sdk</groupId>
    <artifactId>alipay-sdk-java</artifactId>
    <version>4.10.87.ALL</version>
</dependency>

2.2 封装工具类

• AliPayUtil

import com.alipay.api.AlipayApiException;
import com.alipay.api.AlipayClient;
import com.alipay.api.DefaultAlipayClient;
import com.alipay.api.request.*;
import com.alipay.api.response.*;

public class AliPayUtil {
    /**
     * 支付宝相关配置
     */
    public static final String ALIPAY_APPID = "（APPID）";
    public static final String ALIPAY_PRIVATEKEY = "（私钥）";
    public static final String ALIPAY_PUBLICKEY = "（公钥）";

    private static final AlipayClient alipayClient;

    static {
        alipayClient = new DefaultAlipayClient("https://openapi.alipay.com/gateway.do",
                ALIPAY_APPID,
                ALIPAY_PRIVATEKEY,
                "json", "UTF-8",
                ALIPAY_PUBLICKEY, "RSA2");
    }

    /**
     * 生成支付链接
     */
    public static String createPayUrl(String payjson) {
        //创建请求对象
        AlipayTradePrecreateRequest request = new AlipayTradePrecreateRequest();
        //设置请求参数 必选
        request.setBizContent(payjson);
        try {//发起请求 获取响应
            AlipayTradePrecreateResponse response = alipayClient.execute(request);
            if (response.isSuccess()) {
                return response.getQrCode();
            }
        } catch (AlipayApiException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 撤消支付
     */
    public static String cancelPay(String oid) {
        AlipayTradeCancelRequest request = new AlipayTradeCancelRequest();
        request.setBizContent("{\"trade_no\":" + oid + "}");
        try {
            AlipayTradeCancelResponse response = alipayClient.execute(request);
            if (response.isSuccess()) {
                return response.getAction();
            }
        } catch (AlipayApiException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 关闭支付
     */
    public static boolean closePay(String oid) {
        AlipayTradeCloseRequest request = new AlipayTradeCloseRequest();
        request.setBizContent("{\"trade_no\":" + oid + "}");
        try {
            AlipayTradeCloseResponse response = alipayClient.execute(request);
            if (response.isSuccess()) {
                return true;
            }
        } catch (AlipayApiException e) {
            e.printStackTrace();
        }
        return false;
    }

    /**
     * 查询支付状态
     * 交易状态：WAIT_BUYER_PAY（交易创建，等待买家付款）、TRADE_CLOSED（未付款交易超时关闭，或支付完成后全额退款）、TRADE_SUCCESS（交易支付成功）、TRADE_FINISHED（交易结束，不可退款）
     */
    public static String queryPay(String oid) {
        AlipayTradeQueryRequest request = new AlipayTradeQueryRequest();
        request.setBizContent("{\"out_trade_no\":" + oid + "}");
        try {
            AlipayTradeQueryResponse response = alipayClient.execute(request);
            if (response.isSuccess()) {
                return response.getTradeStatus();
            }
            System.err.println(response.getMsg());
        } catch (AlipayApiException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 退款
     */
    public static boolean refundPay(String payjson) {
        AlipayTradeRefundRequest request = new AlipayTradeRefundRequest();
        request.setBizContent(payjson);
        try {
            AlipayTradeRefundResponse response = alipayClient.execute(request);
            if (response.isSuccess()) {
                return true;
            }
        } catch (AlipayApiException e) {
            e.printStackTrace();
        }
        return false;
    }

    /**
     * 查询退款进度
     */
    public static boolean refundQueryPay(String payjson) {
        AlipayTradeFastpayRefundQueryRequest request = new AlipayTradeFastpayRefundQueryRequest();
        request.setBizContent(payjson);
        try {
            AlipayTradeFastpayRefundQueryResponse response = alipayClient.execute(request);
            if (response.isSuccess()) {
                return true;
            }
        } catch (AlipayApiException e) {
            e.printStackTrace();
        }
        return false;
    }
}

2.3 封装接口实现

• AliPayController

// API
@RestController
@RequestMapping("/api/alipay")
public class AliPayController {
    @Autowired
    private AliPayService service;

    @PostMapping("/createpay.do")
    public R createPay(@RequestBody AliPayDto dto) {
        return service.createPay(dto);
    }

    @GetMapping("/querypay.do")
    public R queryPay(@RequestParam String oid) {
        return service.queryPay(oid);
    }

    @PostMapping("/refundpay.do")
    public R refundPay(@RequestBody AliPayRefundDto dto) {
        return service.refundPay(dto);
    }
}

• AliPayService

public interface AliPayService {
    /**
     * 生成支付二维码
     */
    R<String> createPay(AliPayDto payDto);

    /**
     * 查询支付状态
     */
    R<String> queryPay(String oid);

    /**
     * 退款
     */
    R refundPay(AliPayRefundDto refundDto);
}

• AliPayServiceImpl

import com.alibaba.fastjson.JSON;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;
import java.util.Base64;

@Service
public class AliPayServiceImpl implements AliPayService {
    @Override
    public R<String> createPay(AliPayDto payDto) {
        String qrcode = AliPayUtil.createPayUrl(JSON.toJSONString(payDto));
        if (!StringUtils.isEmpty(qrcode)) {
            // 生成二维码（依赖二维码工具类）
            return R.ok("http://localhost:8085/api/qrcode/payqrcode/" + Base64.getUrlEncoder().encodeToString(qrcode.getBytes()));
        }
        return R.error();
    }

    @Override
    public R<String> queryPay(String oid) {
        return R.ok(AliPayUtil.queryPay(oid));
    }

    @Override
    public R refundPay(AliPayRefundDto refundDto) {
        if (AliPayUtil.refundPay(JSON.toJSONString(refundDto))) {
            return R.ok();
        } else {
            return R.error();
        }
    }
}