手把手教你完成微信公众号支付

微信公众号支付是我接触微信支付最复杂的一个了,当时总共弄了五天才弄好,很惭愧.

1,首先咋们还是先看看图,图看懂了一切都好说

2,整个流程大概弄清楚了,需要做准备工作了

code -------------- 用户点击 充值 需要访问微信服务器 获取 code,然后服务器接收Code,此处特别注意,这个code用来获取openId的重要参数

/**
     * 用户点击充值 获取Code
     * @param request
     * @return
     */
    @RequestMapping(value = "getCode")
    public String getCode(HttpServletRequest request) {
        String code = request.getParameter("code");
        return "redirect:http://localhost:8080/faint-service/static/h5/topup.html?code=" + code;
    }

openId   --------------此参数是  调用同意下单接口  必要参数 

APIKEY ---------  支付秘钥(微信商户平台可查,需要自己设置)

appid -----   商户ID(微信商户平台可查)

body-------   商品名称

mch_id -----     支付商户号(微信商户平台可查)

nonce_str ---------- 随机字符串

/**
     * 获取随机字符串 Nonce Str
     *
     * @return String 随机字符串
     */
    public static String generateNonceStr() {
        char[] nonceChars = new char[32];
        for (int index = 0 ; index < nonceChars.length ; ++index) {
            nonceChars[index] = SYMBOLS.charAt(RANDOM.nextInt(SYMBOLS.length()));
        }
        return new String(nonceChars);
    }

out_trade_no------------   订单号

spbill_create_ip ------------请求IP

/**
     * 获取用户实际ip
     * @param request
     * @return
     */
    public static String getIpAddr(HttpServletRequest request) {
        String ipAddress = request.getHeader("x-forwarded-for");
        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getHeader("Proxy-Client-IP");
        }
        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getRemoteAddr();
            if (ipAddress.equals("127.0.0.1") || ipAddress.equals("0:0:0:0:0:0:0:1")) {
                //根据网卡取本机配置的IP  
                InetAddress inet = null;
                try {
                    inet = InetAddress.getLocalHost();
                } catch (UnknownHostException e) {
                    e.printStackTrace();
                }
                ipAddress = inet.getHostAddress();
            }
        }
        //对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割  
        if (ipAddress != null && ipAddress.length() > 15) { //"***.***.***.***".length() = 15  
            if (ipAddress.indexOf(",") > 0) {
                ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
            }
        }
        return ipAddress;
    }

total_fee------------ //,字符串类型,获取金额，单位分

trade_type -------------------//支付类型,公众号就是  "JSAPI"

notify_url   ----------------- //此路径是微信服务器调用支付结果带了一大批参数多次请求

 

3,废话不多说,上代码吧

/**
     * 微信公众号充值金币业务逻辑
     * @param request
      * @param code 微信返回的"code"
     * @param rechargeNumber  充值的用户ID
     * @param rechargeId 由 金钱+金币个数构成的字符串
     * @return
     */
    @RequestMapping(value = "goldOrders", method = RequestMethod.GET)
    @ResponseBody
    public Map goldOrders(HttpServletRequest request, String code, Integer rechargeNumber, String rechargeId) {

        t