native支付，生成二维码，用户扫码支付

• 流程图

  

• 具体实现

  • 添加依赖

        <dependency>
            <groupId>com.github.wxpay</groupId>
            <artifactId>wxpay-sdk</artifactId>
            <version>0.0.3</version>
        </dependency>

    主要是用到这个jar包里面的获取随机字符串，WXPayUtil.generateSignedXml，WXPayUtil.xmlToMap(content)功能

  • 1、商户系统生成微信支付所需信息

    String xmlParam=WXPayUtil.generateSignedXml(paramMap,partnerkey);2、发送给微信，商户系统接收微信返回数据，生成二维码

    @PostMapping("/wx/submit")
    public   Map  wxSubmit(String orderId) throws Exception {
    
        OrderInfo orderInfo = orderService.getOrderInfo(orderId);
    
        Map paramMap=new HashMap();//组织参数，传给微信
        paramMap.put("appid",appid);
        paramMap.put("mch_id",partner);//商户号
        paramMap.put("nonce_str",WXPayUtil.generateNonceStr());//生成随机字符串
        paramMap.put("body",orderInfo.genSubject());//商品描述
        paramMap.put("out_trade_no",  "ATGUIGU-"+orderId+"-"+System.currentTimeMillis());//订单号生成
        paramMap.put("total_fee",orderInfo.getTotalAmount().multiply(new BigDecimal(100)).toBigInteger().toString());//标价金额
        paramMap.put("spbill_create_ip","127.0.0.1");
        paramMap.put("notify_url","http://269026wg43.zicp.vip/wx/callback/notify");//通知地址，支付成功后会通知这里
        paramMap.put("trade_type","NATIVE");
    
        String xmlParam=WXPayUtil.generateSignedXml(paramMap,partnerkey);//map转为xml字符串，并且添加签名，两步并一步
    
        HttpClient httpClient = new HttpClient("https://api.mch.weixin.qq.com/pay/unifiedorder");//生成连接
    
        httpClient.setXmlParam(xmlParam);//将参数放入
    
        httpClient.post();//提交给微信
    
        String content = httpClient.getContent();  //得到返回结果的xml
    
        Map<String, String> resultMap = WXPayUtil.xmlToMap(content);//转为map
    
        if(resultMap.get("code_url")!=null){//取出code_url
            String code_url = resultMap.get("code_url");
           // HashMap<Object, Object> hashMap = new HashMap<>();
            return resultMap;
        }else{
            System.out.println(resultMap.get("return_code"));
            System.out.println(resultMap.get("return_msg"));
            return  null;
        }
    
    }