How to implement Java payment function?

The simplest payment SDK in history

First let’s take a look at the API:

package com.joe.pay;

import com.joe.pay.pojo.*;

/**
 * 支付服务接口
 *
 * @author joe
 * @version 2018.06.29 11:32
 */
public interface PayService {
    /**
     * 调用第三方支付
     *
     * @param request 支付参数
     * @return 支付结果
     */
    SysResponse<PayResponse> pay(PayRequest request);

    /**
     * 申请退款
     *
     * @param request 退款请求
     * @return 退款响应
     */
    SysResponse<RefundResponse> refund(RefundRequest request);
}

As you can see, the PayService interface provides payment methods and refund methods. Let’s look at the parameter definitions of the payment methods:

package com.joe.pay.pojo;

import lombok.Data;

/**
 * 支付参数，除了openid外所有参数必填
 *
 * @author joe
 * @version 2018.07.02 10:36
 */
@Data
public class PayRequest implements Request{
    /**
     * 商户网站唯一订单号
     */
    private String outTradeNo;
    /**
     * 对一笔交易的描述信息
     */
    private String body;
    /**
     * 商品的标题/交易标题/订单标题/订单关键字等。
     * <p>
     * 对于微信支付来说需传入应用市场上的APP名字-实际商品名称，天天爱消除-游戏充值。
     */
    private String subject;
    /**
     * 订单生成时间，格式为yyyy-MM-dd HH:mm:ss
     */
    private String createTime;
    /**
     * 支付时长，单位为秒，如果设置300就是五分钟，超过五分钟订单自动取消
     */
    private int expire = 300;
    /**
     * 订单金额，单位为分
     */
    private int totalAmount;
    /**
     * 发起请求的用户的实际IP
     */
    private String ip;
    /**
     * 支付类型：APP、WEB（微信对应公众号，支付宝对应网页支付）
     */
    private String tradeType = "APP";
    /**
     * 用户openid，只有在微信公众号支付时需要
     */
    private String openid;
    /**
     * 附加数据，会与结果一并返回
     */
    private String attach;
}

OK, I believe that the above parameters can be understood clearly and intuitively even by students who have never made a payment. They are some basic order information. Let’s look at the definition of refund parameters:

package com.joe.pay.pojo;

import lombok.Data;
import org.hibernate.validator.constraints.NotEmpty;

import javax.validation.constraints.Size;

/**
 * 退款请求
 *
 * @author joe
 * @version 2018.07.05 17:12
 */
@Data
public class RefundRequest {
    /**
     * 第三方账单ID，与outTradeNo不能同时为空
     */
    private String orderId;
    /**
     * 商户系统订单ID，与orderId不能同时为空
     */
    private String outTradeNo;
    /**
     * 商户退款单号
     * <p>
     * 退款支持单笔交易分多次退款，多次退款需要提交原支付订单的商户订单号和设置不同的退款单号。申请退款总金
     * <p>
     * 额不能超过订单金额。 一笔退款失败后重新提交，请不要更换退款单号，请使用原商户退款单号。
     */
    @NotEmpty(message = "商户退款单号不能为空")
    private String outRefundNo;
    /**
     * 订单总金额，单位为分
     */
    @Size(min = 1)
    private int totalFee;
    /**
     * 退款金额，不能大于订单总金额
     * <p>
     * 注：多次退款总金额不能大于订单总金额
     */
    @Size(min = 1)
    private int refundFee;
    /**
     * 退款原因
     * <p>
     * 可以为空
     */
    private String refundDesc;
}

The refund parameters are even simpler and require quite little information. With this in place, we can look at the payment test code:

package com.joe.pay;

import com.joe.pay.pojo.*;
import com.joe.pay.pojo.prop.PayProp;
import com.joe.utils.common.DateUtil;
import com.joe.utils.common.Tools;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

/**
 * 支付测试
 *
 * @author joe
 * @version 2018.07.02 14:38
 */
public class PayServiceTest {
    /**
     * 微信配置
     */
    private PayProp wxProp;
    private PayProp aliProp;
    /**
     * 微信服务
     */
    private PayService wxPayService;
    private PayService aliPayService;

    @Before
    public void init() {
        //配置微信支付，需要将下列参数替换为自己的参数
        wxProp = PayProp.builder()
                .appid("123123123")
                .notifyUrl("http://www.baidu.com")
                .useWxPay()
                .certInput(null)
                .key("123123123")
                .mchId("123123123123")
                .password("123123123123")
                .build();

        wxPayService = PayServiceFactory.getInstance(wxProp);

        String privateKey = "MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDEuQvaAad8+PAUVLeh9tqNsWNDCiAXEal4krM0E1"
                + "4oHiUvzOT8Xf5BYZeMmiA+G+Z4iT2dP6bNRBIth7W5COh51v8TDf4dYxqV3Jw7jyQF2K/p74izFXm96yDXz3cMotRdDW3JdcC"
                + "ME2tgrlSjJxN26qPCrHh+OL9Y/yqJGhsAHKlaIYQ4S8F9B3rIPMAv6MbTuHFrFXkwuJqesupTwUqzmPgriy/2Au9ZApnpVCex"
                + "sKIkjMwpmOe3FxaQ9U6271NA9jmzbg7ge5BlfblQL3lIkEQdoqPPKrfLbO3djN1ORn1vhKrIAUhIQAqWKDVdz9dGxrIZckGOe"
                + "8iuUGOs8D4VAgMBAAECggEBAIzyuJcekE5uXjVy7Y9SOw1Ch5hE/PEKao5FLbimF9ROpP42o+pdvgpCTj8jPu7BNsQuMMM2E+"
                + "EGYK/WiFFnHIlYIbIZWHTdyPKO+jGCQaEevAu04BDP1kZI7WMy9m1LTTTOplat06OJVmoS/flXyg5t159ny31EU3UEfgl1dts"
                + "AayODTTRkRUjYXYXSOSDLZjlxSntNS9seklPgEeinc2umrdzJuzciKspK1XLqpCvc+1WA2NlTkoW6Hc9aj61ySCOTkF/3OVjj"
                + "G58jiUMzSeRsG3gq3PEJfhw2FUiJxn04ZRId74tIKrjKV4Np97WdmFEkpTEUTqvSp3AUYm/wJ5ECgYEA9pzaM+dd7vacLbgkA"
                + "e3N8dfyJggSJWm5TpangYIfQBXp+TiLhHFP6lhpCrs/qoxdsmM6LtzEkchvAQOA1kgNgRhm4s1pihKc7aAqK9YxE2tT5Z8XXd"
                + "9SXdLoHXe7GW3Q2ivouMV+J31mhOwSlogR5q0AztXJCl0FH9HHehMyAC8CgYEAzDYJOTOiHm5xjAJ337dtVe1zGUUBwv58B2O"
                + "wZXp129frnOepM+B663aMbrh+IUzVSQWqufGKUkLwjbRmwjrs9Lw4nFYtNGYVp1wnFawVOXy532tthYG5m3i/KcXjIRwnNHew"
                + "9Xh5q9rDc30yPKMps+Uijrp7ktQIRfh+QbOi8PsCgYBQccXz3GsVwjgb6c9FGc9uLmT85vEUZzJdYmNtqYaMHxndhAZuw4+v/"
                + "/rz1zTjazo9MIUQOE+exmT/Tac/Pu24yL73CM5+jafHE9HtzsbfcMlDQ+wZYPm7RUsWIbJUjy/rmxsk+rc2Jn/EqEU/+U7tkk"
                + "2LKs2TpdhAEuwg9BYBXQKBgQCKAZKmJ7DOJBF0b06X0ByBz6DTWQFhyB4F2GcjjWkNE5TVSvHcbz5i1pD9Wo1S79vMJ5pDY2r"
                + "5QOfUvDAd3zi4BGO1s7+FA+BqZCq9yLfnS9VJmg5ABXVsDmQSVPu0KpSMLr9WhP34FjW0XM2QkSvjuVxrXLeaeNTGhLK+sCnT"
                + "9QKBgHfd3hhLWjO4zh99B+PRYFgpnJa9S5E1zzoejZVIJhK5q60KLV5n/HMxuHTGRZxpbfcH4/44d3Yz7ieccmCiPtqxFYUwP"
                + "W0JukNWDL2tOzTSZ5ABAwqorV3bM67mLUSt0O5dL4YtSBJ2J3F6joO1fTZEcUCybO/A5J4wTZDOV1AR";

        //配置支付宝支付，需要将下列参数替换为自己的参数
        aliProp = PayProp.builder()
                .appid("123123123")
                .notifyUrl("http://www.baidu.com")
                .useAliPay()
                .publicKey("123123")
                .privateKey(privateKey)
                .build();
        aliPayService = PayServiceFactory.getInstance(aliProp);
    }

    /**
     * 测试微信支付
     */
    @Test
    public void doWxPay() {
        doPay(wxPayService);
    }

    /**
     * 测试支付宝支付
     */
    @Test
    public void doAliPay() {
        doPay(aliPayService);
    }

    /**
     * 测试微信退款
     * <p>
     * 注意：该测试当前通不过，因为没有提供正确的证书，若想要测试通过则需要在配置文件中提供正确的微信证书和单号
     */
    @Test
    public void doWxRefund() {
        doRefund(wxPayService);
    }

    /**
     * 测试支付宝退款
     * <p>
     * 注意：该测试当前通不过，若想要测试通过则需要提供正确的单号
     */
    @Test
    public void doAliRefund() {
        doRefund(aliPayService);
    }

    /**
     * 校验响应
     *
     * @param response 响应
     */
    private void check(SysResponse<? extends BizResponse> response) {
        Assert.assertTrue(response.isSuccess());
        Assert.assertTrue(response.getData().isSuccess());
    }

    /**
     * 发起支付请求
     *
     * @param service service
     */
    private void doPay(PayService service) {
        SysResponse<PayResponse> response = service.pay(buildPay());
        check(response);
    }

    /**
     * 发起退款请求
     *
     * @param service service
     */
    private void doRefund(PayService service) {
        SysResponse<RefundResponse> response = service.refund(buildRefund());
        System.out.println("结果是：" + response);
    }

    /**
     * 构建一个支付订单
     *
     * @return 支付订单
     */
    private PayRequest buildPay() {
        PayRequest payRequest = new PayRequest();
        payRequest.setOutTradeNo(Tools.createUUID());
        payRequest.setBody("天天爱消除-游戏充值");
        payRequest.setSubject("天天爱消除-游戏充值");
        payRequest.setCreateTime(DateUtil.getFormatDate(DateUtil.BASE));
        payRequest.setTotalAmount(100 * 10);
        payRequest.setIp("106.120.141.226");
        return payRequest;
    }

    /**
     * 构建一个退款订单
     *
     * @return 退款订单
     */
    private RefundRequest buildRefund() {
        RefundRequest request = new RefundRequest();
        request.setOutTradeNo("123456");
        request.setOutRefundNo("123456");
        request.setTotalFee(100 * 10);
        request.setRefundFee(100);
        return request;
    }
}

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