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1.进入支付宝开放者平台

https://openhome.alipay.com/platform/home.htm

2.导入pom依赖

               
    
     com.alipay.sdk
                
    
     alipay-sdk-java
                
    
     3.7.110.ALL
    
   

3.controller

@RestControllerpublic class PayController {
       @RequestMapping("/pay")    public void pay(HttpServletRequest httpRequest,                    HttpServletResponse httpResponse) throws IOException {
           AlipayClient alipayClient =  new DefaultAlipayClient( "https://openapi.alipaydev.com/gateway.do" , "AppID", "自己的私钥", "json", "utf-8", "自己的公钥", "RSA2");  //获得初始化的AlipayClient        AlipayTradePagePayRequest alipayRequest =  new  AlipayTradePagePayRequest(); //创建API对应的request        //支付成功后的回调地址        alipayRequest.setReturnUrl( "回调网址（花生壳）" );        alipayRequest.setNotifyUrl( "http://domain.com/CallBack/notify_url.jsp" ); //在公共参数中设置回跳和通知地址        alipayRequest.setBizContent("{"  +                "    \"out_trade_no\":\"12345678909875\","  +                "    \"product_code\":\"FAST_INSTANT_TRADE_PAY\","  +                "    \"total_amount\":88.88,"  +                "    \"subject\":\"Iphone6 16G\","  +                "    \"body\":\"Iphone6 16G\","  +                "    \"passback_params\":\"merchantBizType%3d3C%26merchantBizNo%3d2016010101111\","  +                "    \"extend_params\":{"  +                "    \"sys_service_provider_id\":\"2088511833207846\""  +                "    }" +                "  }"  ); //填充业务参数        String form= "" ;        try  {
               form = alipayClient.pageExecute(alipayRequest).getBody();  //调用SDK生成表单        }  catch  (AlipayApiException e) {
               e.printStackTrace();        }        httpResponse.setContentType( "text/html;charset="  + "UTF-8");        httpResponse.getWriter().write(form); //直接将完整的表单html输出到页面        httpResponse.getWriter().flush();        httpResponse.getWriter().close();    }    @RequestMapping("/returnUrl")    public void returnUrl(HttpServletRequest request , HttpResponse httpResp) throws AlipayApiException {
           Map
   
     stringStringMap = convertRequestParamsToMap(request);        boolean  signVerified = AlipaySignature.rsaCheckV1(stringStringMap, "公钥", "utf-8", "RSA2");  //调用SDK验证签名        if (signVerified){
               // TODO 验签成功后，按照支付结果异步通知中的描述，对支付结果中的业务内容进行二次校验，校验成功后在response中返回success并继续商户自身业务处理，校验失败返回failure            System.out.println(stringStringMap);        } else {
               // TODO 验签失败则记录异常日志，并在response中返回failure.        }    }    // 将request中的参数转换成Map    private static Map
    
      convertRequestParamsToMap(HttpServletRequest request) {
           Map
     
       retMap = new HashMap
      
       ();        Set
       
        
         > entrySet = request.getParameterMap().entrySet(); for (Map.Entry
         
           entry : entrySet) { String name = entry.getKey(); String[] values = entry.getValue(); int valLen = values.length; if (valLen == 1) { retMap.put(name, values[0]); } else if (valLen > 1) { StringBuilder sb = new StringBuilder(); for (String val : values) { sb.append(",").append(val); } retMap.put(name, sb.toString().substring(1)); } else { retMap.put(name, ""); } } return retMap; }}
         
        
       
      
     
    
   

4.访问

http://localhost:8088/pay

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