1.测试环境

Maven
Spring boot
Jdk 1.8

2.本地配置

获取支付宝支付Java SDK,maven项目可以选择maven版本,普通java项目可以在GitHub下载,这里以maven为例

SDK下载地址：https://doc.open.alipay.com/docs/doc.htm?treeId=193&articleId=103419&docType=1

选择最新版的SDK版本

复制maven坐标,导入spring boot项目pom 文件里面

打开开发文档:小程序文档 – 支付宝文档中心

这里只是单独对电脑网站支付统一收单下单并支付页面接口进行测试.

编写一个接口,为了方便演示,创建get请求,订单信息写死在代码中

//支付宝支付接口
@Controller
@RequestMapping("/pay")
public class AlipayTest {


    private String serverUrl="https://openapi.alipaydev.com/gateway.do";
    private String appId="2021000122601685";
    private String privateKey="MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQCCk5evhVhZL3kaWEN4ACD+xHoTfn0RqR7aoh2esSTHeca8bV77z4KYUYXH/76uG1ufeYX8CsI68fMTTIxTcvA1F/vctjCkyAS3fjo+DTPpQ5tZpXvJjbNhwXJwrNov/44Dsy727N+b6CAmz5C6vkNipTdekUlHO+6EJmNgMo+ZgYuoEvinP/1JLST6IpcYj/QjGtG8cYStDlx6C3P2Xk7Jv//rOsMbem6bO5v7zZU4E29lVn5mZucxyPqDfRgyz2H++EaNxDRRh6cdVxwntEImpn9Tap+Jv1tTEddI7pOnXqsOwy5lOEJ6r36g48OyXWOLum2x9bxZUs/6tg96VAgMBAAECggEAN7StlqTltHuJNQ2hBe9eQSjKRJmI3y8gQc5C6ZLLNSHXzselaEQHNd6mMjarPhg6zUV8wPH/wuvbsFOcF9tmMkFmxBiyjnGwV1pjYVmafMkpwh7jWkLk9UBLPTEbKN2+wqbuq08Pjc7et2cywRXjn8SrhQ6F47dZBspgkTDQ+PTpQ4unHjUeQVz55K2VitReDZuTNWPCj2DT7UHDaItFTVtG0oNd1mVtcmeS+4Na7WS/3dusUef2v8fpTuTYcNNcoDxYLunL90u3H5AQCnKIkk+hu6qWyuU6eJLj8QgOf82JqZcueFQxFI/8Ahlv/Y3yfdDm5RfrpsgQKBgQDXT9v9inqZPYgQqTOfZwgtU9WLcuO3e8RaKZ8NUl67Y+M4iKoYoms9ZdBFDPdj5BAygncZpTv4wrJ5Fj1gVeuBMWwmf34WkopQwXt+GbmNHPVFe12XzjkyJBGE3dOG3k0hAadWIw4O2Ipx0IqQFzQdiNCU1cSCQKBgQCbQH1260iD0PF/tNvYyq/YDe+I9+NrPgSe6f0gTOSFFo/Ni04T23vxCSdSt8mDlCULx71hxkr7uNYReUCI/ujXijlgyI/MOmd1AsDEfYceBXkEsOVjC4Zf4zYyvqqTArDdS6Hsn+Y3rwwEBa+hhTLvraCHZddbjbY7rlJttQKBgQCT2OiM/ywUUeY+2pJ5aO4FEnAg7hdKwSbKY3v+ynB8kugBq750tcUoGTQVohPaY/y8j1uIfN/pj/bCOTAP/mtrdodEd8ceN+dxXheZ8YcQgwQk7E+tvm4rMH1WGzJ/2KyiTu8AgF/Cd4791L3/NyNdwSLil9vrlwQKBgQCNBsvxllDMzKRTKWr7R0Lss9v/Q45mAHQaFttE2BRNgO0n/X7zMtEnZvU9go2e5JeyV8KEaqf6eTCbtnNnN0VXFwOo+zl7kP5fz5UMz1izUQgxdKD7sI208MmtZAvznhe47V1TDqYxq0KvNi4y64FAgwEuuMqiqFdSP6g4ecQKBgCF4KzJxe0n+intzTGKgt4a8sBDeyjUIPjU3/ujGXbYWzgmHUFtHOIgTMCs8kmkJlI+xgjqnCUNicIr0hfkjtRGTw6Tw0MqDFX1/EfDJp2spv2rQDMZyKCJZwZ2QyZNz2yYdm1ukzxbJI/conKUSsujdhKEZZhchv2MWl2moscwn";
    private String alipayPublicKey="MIIBIjANBgkqhkiG9QEFAAOCAQ8AMIIBCgKCAQEAhsM/TnpIff7e39eqsCLQwI8fBQ+5lYcFjOrSw7p0ZsMETXXAS677MZTKw5JyHVTieg79708qvaYWZ58jYuViTqpBCnot+cEOnEZcfP3TxeKReAH379bHUVQOz7h3uH0eDcFmi3GjwPBB9lmcJdTI6qD/XObiWJID1e+XYzVgNKC+DXfJ2YN8NEuyRH5Zr862s3C6xd8BAYU1VW9ZfyAssQxILCOwQZ0qDOOq48GAhzDWwPG8oteJX7+lcH1TrnG01SmPiZqkHX6uUW2ye+fZkbW9qjtyujNnADIWNb/D1R2qgAcHsuOVV4hniRQIDAQAB";

    //创建订单接口
    @ResponseBody
    @GetMapping("/create")
    public String create(){

        //创建连接
        AlipayClient alipayClient = new DefaultAlipayClient(serverUrl,appId,privateKey,"json", "UTF-8",alipayPublicKey,"RSA2");
        AlipayTradePagePayRequest request = new AlipayTradePagePayRequest();

        //订单信息
        JSONObject bizContent = new JSONObject();
        bizContent.put("out_trade_no", "202100012260165");
        bizContent.put("total_amount", 5.00);
        bizContent.put("subject", "测试");
        bizContent.put("product_code", "FAST_INSTANT_TRADE_PAY");

        request.setBizContent(bizContent.toString());

        AlipayTradePagePayResponse response = null;
        try {
            response = alipayClient.pageExecute(request);
        } catch (AlipayApiException e) {
            e.printStackTrace();
        }
        if(response.isSuccess()){

            //成功
            return  response.getBody();
        } else {
            //失败
           return  "调用失败";
        }
    }
}

注意配置参数: