Java接入支付宝支付

本文只接入了支付宝中的APP支付，如果要拓展更多支付方式的的话，请看文末补充

项目支付流程

前端发起创建订单请求
后端接受请求创建订单，并将订单参数进行支付宝对应签名并返回
前端拿到签名后调起支付宝支付

本文主要写的就是2的过程

前期准备工作：

创建应用
创建公私钥
进入沙箱环境
进行沙箱模拟测试
代码

一：创建应用

二：创建公私钥

在支付宝应用,开发设置，设置接口加签方式（我使用密钥加签，证书加密太复杂还没有研究）
按照指示下载支付宝开放平台密钥工具应用并进行公私钥生成支付宝公钥

三：回到开发平台页面点击进入`沙箱`或者直接点击链接：https://open.alipay.com/api/apiDebug

四：进行沙箱模拟测试

根据业务需求选择合适的API进行测试，模拟出来的签名数据前端拿出调用就行（我已经找前端测试过了，是可以调起支付宝进行支付的）

五：代码

导入maven依赖

    <!--支付宝SDK-->
    <dependency>
        <groupId>com.alipay.sdk</groupId>
        <artifactId>alipay-sdk-java</artifactId>
        <version>4.38.52.ALL</version>
    </dependency>

AliPayUtils.java

https://open.alipay.com/develop/sandbox/app 可以获取公私钥和appId和卖家买家信息


import com.alibaba.fastjson.JSONObject;
import com.alipay.api.AlipayApiException;
import com.alipay.api.AlipayClient;
import com.alipay.api.AlipayConfig;
import com.alipay.api.DefaultAlipayClient;
import com.alipay.api.domain.AlipayTradeAppPayModel;
import com.alipay.api.domain.AlipayTradeCreateModel;
import com.alipay.api.request.AlipayTradeAppPayRequest;
import com.alipay.api.request.AlipayTradeCreateRequest;
import com.alipay.api.response.AlipayTradeAppPayResponse;
import com.alipay.api.response.AlipayTradeCreateResponse;

/**
 * @author miao
 */
public class AliPayUtils {
    private static final String ALI_PAY_PRIVATE_KEY = "你生成的私钥/自定义私钥";
    private static final String ALI_PAY_PUBLIC_KEY = "你生成的公钥/自定义公钥";
    private static final String APP_ID = "沙箱中appId";

    private static AlipayConfig alipayConfig;

    static {
        alipayConfig = new AlipayConfig();
        //服务地址，固定写死
        alipayConfig.setServerUrl("https://openapi-sandbox.dl.alipaydev.com/gateway.do");
        alipayConfig.setAppId(APP_ID);
        alipayConfig.setPrivateKey(ALI_PAY_PRIVATE_KEY);
        alipayConfig.setFormat("json");
        alipayConfig.setAlipayPublicKey(ALI_PAY_PUBLIC_KEY);
        alipayConfig.setCharset("UTF8");
        alipayConfig.setSignType("RSA2");
    }


    public static String createAppTradePay(String orderId, String totalAmount, String subject) throws AlipayApiException {
        AlipayClient alipayClient = new DefaultAlipayClient(alipayConfig);
        AlipayTradeAppPayRequest request = new AlipayTradeAppPayRequest();
        AlipayTradeAppPayModel model = new AlipayTradeAppPayModel();
        model.setOutTradeNo(orderId);
        model.setTotalAmount(totalAmount);
        model.setSubject(subject);
        request.setBizModel(model);
        AlipayTradeAppPayResponse response = alipayClient.sdkExecute(request);
        if (response.isSuccess()) {
            return response.getBody();
        }
        return null;
    }

    public static String createTradeCreate(String orderId, String totalAmount, String subject,String buyerId) throws AlipayApiException {

        AlipayClient alipayClient = new DefaultAlipayClient(alipayConfig);
        AlipayTradeCreateRequest request = new AlipayTradeCreateRequest();
        AlipayTradeCreateModel model = new AlipayTradeCreateModel();
        model.setOutTradeNo(orderId);
        model.setTotalAmount(totalAmount);
        model.setSubject(subject);
        model.setBuyerId(buyerId);
        request.setBizModel(model);
        AlipayTradeCreateResponse response = alipayClient.execute(request);

        if (response.isSuccess()) {
            //目前只知道这个sign有用，但是还没具体用到
            return JSONObject.parseObject(response.getBody()).getString("sign");
        }
        return null;
    }
}

测试类

    public static void main(String[] args) throws AlipayApiException {

//        String result = AliPayUtils.createAppTradePay("123456", "19.52", "测试APP支付");
//        System.out.println(result);
        String result = AliPayUtils.createTradeCreate("123456","111222","测试当面付","2中沙箱账号的买家uid");
        System.out.println(result);

    }