微信支付集成坑太多！Ｋ〕觥询枚！

我們支付成功之后，微信會回調(diào)我們設置的url浙巫，請注意金蜀，此url必須是通過外網(wǎng)能夠訪問的！我們可以通過Natapp映射實現(xiàn)的畴。

收到回調(diào)通知之后渊抄，我們需要給微信發(fā)送消息，告訴微信丧裁，我們已經(jīng)處理完成了护桦，要不然微信會間隔回調(diào)接口8次！煎娇！

如何告訴他呢二庵，通過下面代碼即可：

response.setContentType("text/html;charset=UTF-8");
            printWriter = response.getWriter();
            final String resultToWX =
                    "<xml>" +
                            "<return_code><![CDATA[SUCCESS]]></return_code>" +
                            "<return_msg><![CDATA[OK]]></return_msg>" +
                            "</xml>";
            printWriter.write(resultToWX);
            printWriter.flush();

請注意，如果你是使用Spring MVC框架缓呛，那么在控制器返回時催享，記得返回null，沒錯就是null哟绊，要不然會報getWriter() has already been called for this response 異常因妙。

下面貼一下完整代碼，包括微信返回xml信息的解析：

 @RequestMapping("resultPay")
    public String resultPay(HttpServletResponse response, HttpServletRequest request, @ModelAttribute("e")String e) {
        //接受微信返回的信息
        InputStream inputStream = null;
        BufferedReader reader = null;
        OutputStream outputStream = null;
        PrintWriter printWriter = null;
        try {
            inputStream = request.getInputStream();
            reader = new BufferedReader(new InputStreamReader(inputStream, OverallCoding.coding));
            StringBuilder stringBuilder = new StringBuilder();
            String str;
            while ((str = reader.readLine()) != null){
                stringBuilder.append(str);
            }
            //對微信返回的xml信息做解析
            System.out.println("信息返回:" + stringBuilder.toString());
            WXPayResult wxPayResult = WXPayResultHandle.handleResult(stringBuilder.toString());
            /**
             * wxPayResult是已經(jīng)處理過得微信返回的信息
             * 在這里寫結果處理邏輯
             */

            //給微信發(fā)送通知, 關閉此次支付流程
            response.reset();
            response.setContentType("text/html;charset=UTF-8");
            printWriter = response.getWriter();
            final String resultToWX =
                    "<xml>" +
                            "<return_code><![CDATA[SUCCESS]]></return_code>" +
                            "<return_msg><![CDATA[OK]]></return_msg>" +
                            "</xml>";
            printWriter.write(resultToWX);
            printWriter.flush();
        } catch (IOException e1) {
            e1.printStackTrace();
        } finally {
            try {
                if (printWriter != null) printWriter.close();
                if (outputStream != null) outputStream.close();
                if (reader != null) reader.close();
                if (reader != null) inputStream.close();
            } catch (IOException e1) {}
        }
        return null;
    }

public static WXPayResult handleResult(String xmlResult){
        Document document = null;
        try {
            document = DocumentHelper.parseText(xmlResult);
            //獲取根節(jié)點元素對象
            Element node = document.getRootElement();
            // 當前節(jié)點下面子節(jié)點迭代器
            Iterator<Element> it = node.elementIterator();
            // 遍歷
            WXPayResult wxPayResult = new WXPayResult();
            while (it.hasNext()) {
                Element e = it.next();
                if (e.getName() == null) continue;
                switch (e.getName()){
                    case "appid":
                        wxPayResult.setAppid(e.getText());
                        break;
                    case "bank_type":
                        wxPayResult.setBank_type(e.getText());
                        break;
                    case "cash_fee":
                        wxPayResult.setCash_fee(e.getText());
                        break;
                    case "device_info":
                        wxPayResult.setDevice_info(e.getText());
                        break;
                    case "fee_type":
                        wxPayResult.setFee_type(e.getText());
                        break;
                    case "is_subscribe":
                        wxPayResult.setIs_subscribe(e.getText());
                        break;
                    case "mch_id":
                        wxPayResult.setMch_id(e.getText());
                        break;
                    case "nonce_str":
                        wxPayResult.setNonce_str(e.getText());
                        break;
                    case "openid":
                        wxPayResult.setOpenid(e.getText());
                        break;
                    case "out_trade_no":
                        wxPayResult.setOut_trade_no(e.getText());
                        break;
                    case "result_code":
                        wxPayResult.setResult_code(e.getText());
                        break;
                    case "return_code":
                        wxPayResult.setReturn_code(e.getText());
                        break;
                    case "sign":
                        wxPayResult.setSign(e.getText());
                        break;
                    case "time_end":
                        wxPayResult.setTime_end(e.getText());
                        break;
                    case "total_fee":
                        wxPayResult.setTotal_fee(e.getText());
                        break;
                    case "trade_type":
                        wxPayResult.setTrade_type(e.getText());
                        break;
                    case "transaction_id":
                        wxPayResult.setTransaction_id(e.getText());
                        break;
                    default:
                        continue;
                }
            }
            return wxPayResult;
        } catch (DocumentException e) {
            e.printStackTrace();
        }
        return null;
    }

public class WXPayResult {

    //公眾賬號id
    String appid;
    //付款銀行
    String bank_type;
    //現(xiàn)金支付金額
    String cash_fee;
    //設備號
    String device_info;
    //貨幣種類
    String fee_type;
    //是否關注公眾賬號
    String is_subscribe;
    //商戶號
    String mch_id;
    //隨機字符串
    String nonce_str;
    //用戶標識
    String openid;
    //商戶訂單號
    String out_trade_no;
    //業(yè)務結果
    String result_code;
    String return_code;
    //簽名
    String sign;
    //支付完成時間
    String time_end;
    //訂單金額
    String total_fee;
    //交易類型
    String trade_type;
    //微信支付訂單號
    String transaction_id;

    public void setAppid(String appid){
        this.appid = appid;
    }

    public void setBank_type(String bank_type){
        this.bank_type = bank_type;
    }

    public void setCash_fee(String cash_fee) {
        this.cash_fee = cash_fee;
    }

    public void setDevice_info(String device_info) {
        this.device_info = device_info;
    }

    public void setFee_type(String fee_type) {
        this.fee_type = fee_type;
    }

    public void setIs_subscribe(String is_subscribe) {
        this.is_subscribe = is_subscribe;
    }

    public void setMch_id(String mch_id) {
        this.mch_id = mch_id;
    }

    public void setNonce_str(String nonce_str) {
        this.nonce_str = nonce_str;
    }

    public void setOpenid(String openid) {
        this.openid = openid;
    }

    public void setOut_trade_no(String out_trade_no) {
        this.out_trade_no = out_trade_no;
    }

    public void setResult_code(String result_code) {
        this.result_code = result_code;
    }

    public void setReturn_code(String return_code) {
        this.return_code = return_code;
    }

    public void setSign(String sign) {
        this.sign = sign;
    }

    public void setTime_end(String time_end) {
        this.time_end = time_end;
    }

    public void setTotal_fee(String total_fee) {
        this.total_fee = total_fee;
    }

    public void setTrade_type(String trade_type) {
        this.trade_type = trade_type;
    }

    public void setTransaction_id(String transaction_id) {
        this.transaction_id = transaction_id;
    }

    public String getAppid() {
        return appid;
    }

    public String getBank_type() {
        return bank_type;
    }

    public String getCash_fee() {
        return cash_fee;
    }

    public String getDevice_info() {
        return device_info;
    }

    public String getFee_type() {
        return fee_type;
    }

    public String getIs_subscribe() {
        return is_subscribe;
    }

    public String getMch_id() {
        return mch_id;
    }

    public String getNonce_str() {
        return nonce_str;
    }

    public String getOpenid() {
        return openid;
    }

    public String getOut_trade_no() {
        return out_trade_no;
    }

    public String getResult_code() {
        return result_code;
    }

    public String getReturn_code() {
        return return_code;
    }

    public String getSign() {
        return sign;
    }

    public String getTime_end() {
        return time_end;
    }

    public String getTotal_fee() {
        return total_fee;
    }

    public String getTrade_type() {
        return trade_type;
    }

    public String getTransaction_id() {
        return transaction_id;
    }

}

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