jsp调用支付宝

<!-- 在pom.xml中添加依赖 -->
<dependency>
    <groupId>com.alipay.sdk</groupId>
    <artifactId>alipay-sdk-java</artifactId>
    <version>4.10.124.ALL</version>
</dependency>

<form action="alipay" method="post">
    商品名称: <input type="text" name="subject" value="Test Product"><br>
    商品金额: <input type="text" name="total_amount" value="0.01"><br>
    <input type="submit" value="立即支付">
</form>

@WebServlet("/alipay")
public class AlipayServlet extends HttpServlet {
    private static final String APP_ID = "your_app_id";
    private static final String PRIVATE_KEY = "your_private_key";
    private static final String ALIPAY_PUBLIC_KEY = "alipay_public_key";

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // 创建支付宝客户端实例
        AlipayClient alipayClient = new DefaultAlipayClient(
            "https://openapi.alipay.com/gateway.do", 
            APP_ID, 
            PRIVATE_KEY, 
            "json", 
            "UTF-8", 
            ALIPAY_PUBLIC_KEY, 
            "RSA2"
        );

        // 创建API请求并设置参数
        AlipayTradePagePayRequest requestApi = new AlipayTradePagePayRequest();
        requestApi.setReturnUrl("http://yourdomain.com/return_url");
        requestApi.setNotifyUrl("http://yourdomain.com/notify_url");

        AlipayTradePagePayModel model = new AlipayTradePagePayModel();
        model.setOutTradeNo(UUID.randomUUID().toString());
        model.setProductCode("FAST_INSTANT_TRADE_PAY");
        model.setTotalAmount(request.getParameter("total_amount"));
        model.setSubject(request.getParameter("subject"));
        model.setReturnUrl("http://yourdomain.com/return_url");

        requestApi.setBizModel(model);

        try {
            // 请求并处理响应
            String form = alipayClient.pageExecute(requestApi).getBody();
            response.setContentType("text/html;charset=UTF-8");
            PrintWriter out = response.getWriter();
            out.println(form);
        } catch (AlipayApiException e) {
            e.printStackTrace();
        }
    }
}