Java 开发支付宝支付APL调用方法_java调用支付宝app支付接口

要在Java中开发使用支付宝支付API调用，您需要执行以下步骤：

1.注册支付宝账户并获得密钥和应用程序ID。

2.下载支付宝开放平台的Java SDK，并将其导入到您的项目中。

3.创建一个名为 "AlipayService" 的类，它将处理支付宝支付API调用并返回响应。

import com.alipay.api.AlipayApiException;
import com.alipay.api.AlipayClient;
import com.alipay.api.DefaultAlipayClient;
import com.alipay.api.request.AlipayTradePagePayRequest;
import com.alipay.api.response.AlipayTradePagePayResponse;
 
public class AlipayService {
    
    private final String APP_ID = "your_app_id_here";
    private final String APP_PRIVATE_KEY = "your_app_private_key_here";
    private final String ALIPAY_PUBLIC_KEY = "alipay_public_key_here";
    private final String CHARSET = "UTF-8";
    private final String SIGN_TYPE = "RSA2";
    private final String GATEWAY_URL = "https://openapi.alipay.com/gateway.do";
    
    public String createPayment(String orderNo, String amount, String subject, String returnUrl) throws AlipayApiException {
        AlipayClient alipayClient = new DefaultAlipayClient(GATEWAY_URL, APP_ID, APP_PRIVATE_KEY, "json", CHARSET, ALIPAY_PUBLIC_KEY, SIGN_TYPE);
        
        AlipayTradePagePayRequest alipayRequest = new AlipayTradePagePayRequest();
        alipayRequest.setReturnUrl(returnUrl);
        alipayRequest.setNotifyUrl("your_notify_url_here");
        
        String outTradeNo = orderNo;
        String totalAmount = amount;
        String productCode = "FAST_INSTANT_TRADE_PAY";
        
        alipayRequest.setBizContent("{\"out_trade_no\":\"" + outTradeNo + "\","
                + "\"total_amount\":\"" + totalAmount + "\","
                + "\"subject\":\"" + subject + "\","
                + "\"product_code\":\"" + productCode + "\"}");
        
        AlipayTradePagePayResponse alipayResponse = alipayClient.pageExecute(alipayRequest);
        
        return alipayResponse.getBody();
    }
}

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.alipay.api.AlipayApiException;
 
public class PaymentServlet extends HttpServlet {
 
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        
        String orderNo = request.getParameter("orderNo");
        String amount = request.getParameter("amount");
        String subject = request.getParameter("subject");
        String returnUrl = request.getParameter("returnUrl");
        
        AlipayService alipayService = new AlipayService();
        try {
            String form = alipayService.createPayment(orderNo, amount, subject, returnUrl);
            response.setContentType("text/html;charset=" + alipayService.CHARSET);
            response.getWriter().write(form);
        } catch (AlipayApiException e) {
            e.printStackTrace();
        }
    }
 
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }
}