java对接支付宝支付

 <!-- https://mvnrepository.com/artifact/com.alipay.sdk/alipay-easysdk -->
        <dependency>
            <groupId>com.alipay.sdk</groupId>
            <artifactId>alipay-easysdk</artifactId>
            <version>2.2.0</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/com.alipay.sdk/alipay-sdk-java -->
        <dependency>
            <groupId>com.alipay.sdk</groupId>
            <artifactId>alipay-sdk-java</artifactId>
            <version>4.10.124.ALL</version>
        </dependency>

 @RequestMapping("/test")
    public void doPost(HttpServletRequest httpRequest,
                       HttpServletResponse httpResponse) throws ServletException, IOException {

        //商户号
        String APP_ID="";
        //私钥
        String APP_PRIVATE_KEY="";
        //编码
        String CHARSET="UTF-8";
        //公钥
        String ALIPAY_PUBLIC_KEY="";
        //我是沙箱环境 所有请求地址是沙箱版
        AlipayClient alipayClient = new DefaultAlipayClient("https://openapi.alipaydev.com/gateway.do", APP_ID, APP_PRIVATE_KEY, "json", CHARSET, ALIPAY_PUBLIC_KEY, "RSA2"); //获得初始化的AlipayClient
        AlipayTradeWapPayRequest alipayRequest = new AlipayTradeWapPayRequest();//创建API对应的request
        //这里主要是设置回调 也就是支付成功之后你要做什么操作的地址
        alipayRequest.setReturnUrl("http://domain.com/CallBack/return_url.jsp");
        alipayRequest.setNotifyUrl("http://domain.com/CallBack/notify_url.jsp");//在公共参数中设置回跳和通知地址
        /**
         * @description:
         * @author: hwk
         * @date: 2022/6/14 16:34
         * @param: out_trade_no 订单编号
         * total_amount 付款金额
         * subject 商品名称
         * product_code 支付方式 如手机网站 pc网站 APP支付等
         **/
       JSONObject jsonObject = new JSONObject();
        jsonObject.put("out_trade_no", "264484811515156");
        jsonObject.put("total_amount", "66");
        jsonObject.put("subject", "测试支付");
        jsonObject.put("product_code", "QUICK_WAP_WAY");
        alipayRequest.setBizContent(jsonObject.toJSONString());
        String form="";
        try {
            form = alipayClient.pageExecute(alipayRequest).getBody();
        } catch (AlipayApiException e) {
            e.printStackTrace();
        }
        //因为我不会写前端 所以直接输出测试 如果在正式环境中 建议直接return 返回的from表单
        httpResponse.setContentType("text/html;charset=" + CHARSET);
        httpResponse.getWriter().write(form);//直接将完整的表单html输出到页面
        httpResponse.getWriter().flush();
        httpResponse.getWriter().close();
    }
    //支付回调
    @RequestMapping("/test1")
    public void aliPayNotify() {
            Map<String, String> params = getAllRequestParam(request);
            String tradeStatus = params.get("trade_status");
            if ("TRADE_SUCCESS".equals(tradeStatus)) {
                System.out.println("支付成功");
            }else {
                System.out.println("支付失败");
            }
    }


    private Map<String, String> getAllRequestParam(final HttpServletRequest request) {
        Map<String, String> res = new HashMap<>(8);
        Enumeration<?> temp = request.getParameterNames();
        while (temp.hasMoreElements()) {
            String en = (String) temp.nextElement();
            String value = request.getParameter(en);
            res.put(en, value);
        }
        return res;
    }