簡(jiǎn)單了解下支付流程
支付寶支付流程
微信掃碼支付流程
項(xiàng)目代碼查看：https://git.oschina.net/lkqm/ploy
重構(gòu)前的代碼：
Servlet
以下代碼有點(diǎn)亂，看注釋，了解這個(gè)步驟即可，執(zhí)行回調(diào)的Servlet:
支付寶
/**
* 支付結(jié)果回調(diào)Servlet
*
* @author luokaiqiongmou
*/@WebServlet("/pay/notify/alipay.do")
public class AlipayNotifyServlet extends HttpServlet {
private static final long serialVersionUID = 8158440606464368180L;
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException { // 1.獲得支付寶服務(wù)器post過(guò)來(lái)的參數(shù)
Map<String, String> params = new HashMap<String, String>(); Map<String, String[]> requestParams = request.getParameterMap(); for (Iterator<String> iter = requestParams.keySet().iterator(); iter.hasNext(); ) { String name = (String) iter.next(); String[] values = (String[]) requestParams.get(name); String valueStr = ""; for (int i = 0; i < values.length; i++) {
valueStr = (i == values.length - 1) ? valueStr + values[i]
: valueStr + values[i] + ",";
}
params.put(name, valueStr);
} // 2.驗(yàn)證參數(shù)的合法性（根據(jù)簽名驗(yàn)證保證數(shù)據(jù)時(shí)，從支付寶平臺(tái)的數(shù)據(jù)）
boolean verify_result = AlipayNotify.verify(params); String trade_status = request.getParameter("trade_status"); if (verify_result
&& (trade_status.equals("TRADE_FINISHED") || trade_status
.equals("TRADE_SUCCESS"))) { try { // 3.支付成功，執(zhí)行業(yè)務(wù)邏輯
String out_trade_no = request.getParameter("out_trade_no"); String total_fee = request.getParameter("total_fee"); // 修改訂單狀態(tài)
UserService userService = ServiceFactory.getService(UserService.class);
userService.paySuccess(out_trade_no, String.valueOf(total_fee), String.valueOf(Order.PAY_WAY_ALIPAY));
response.reset();
PrintWriter out = response.getWriter(); // 4.返回執(zhí)行成功的標(biāo)識(shí)與支付寶服務(wù)器通信，否則支付寶服務(wù)器會(huì)多次再POST數(shù)據(jù)
out.print("SUCCESS");
out.flush();
} catch (ServiceFailedException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}微信
/**
* 微信支付回調(diào)地址
*
* @author luokaiqiongmou
*
*/public class WechatpayNotifyServlet extends HttpServlet { private static final long serialVersionUID = 8158440606464368180L; private UserService userService = ServiceFactory.getService(UserService.class); public void doPost(HttpServletRequest request,HttpServletResponse response) throws IOException{
// 1. 獲得請(qǐng)求參數(shù)（用戶支付成功后，微信服務(wù)器post數(shù)據(jù)過(guò)來(lái)）
InputStream inputStream = request.getInputStream();
BufferedReader in = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
StringBuilder sb = new StringBuilder();
String s ;
while ((s = in.readLine()) != null){
sb.append(s);
}
in.close();
inputStream.close();
//解析xml成map
Map<String, String> parameterMap = null; try {
parameterMap = XMLUtil.doXMLParse(sb.toString());
} catch (JDOMException e1) {
e1.printStackTrace();
}
//過(guò)濾空 設(shè)置 TreeMap
SortedMap<Object,Object> packageParams = new TreeMap<Object,Object>();
Iterator<String> it = parameterMap.keySet().iterator();
while (it.hasNext()) {
String parameter = it.next();
String parameterValue = parameterMap.get(parameter);
String v = "";
if(null != parameterValue) {
v = parameterValue.trim();
}
packageParams.put(parameter, v);
}
// 賬號(hào)信息
String key = PayConfigUtil.API_KEY; // key
//2. 判斷簽名是否正確
if(PayCommonUtil.isTenpaySign("UTF-8", packageParams,key)) {
//------------------------------
//處理業(yè)務(wù)開始
//------------------------------
String resXml = "";
if("SUCCESS".equals(packageParams.get("result_code"))){
// 3.這里是支付成功
//////////執(zhí)行自己的業(yè)務(wù)邏輯////////////////
String out_trade_no = (String)packageParams.get("out_trade_no");
String total_fee = (String)packageParams.get("total_fee");
try{
double money = Integer.valueOf(total_fee)/100.0; // 分轉(zhuǎn)化為員
userService.paySuccess(out_trade_no, String.valueOf(money), String.valueOf(Order.PAY_WAY_WECHAT));
} catch(ServiceFailedException e) {
e.printStackTrace();
} catch(Exception e) {
e.printStackTrace();
}
//////////執(zhí)行自己的業(yè)務(wù)邏輯////////////////
//4. 通知微信.異步確認(rèn)成功.必寫.不然會(huì)一直通知后臺(tái).八次之后就認(rèn)為交易失敗了.
resXml = "<xml>" + "<return_code><![CDATA[SUCCESS]]></return_code>"
+ "<return_msg><![CDATA[OK]]></return_msg>" + "</xml> ";
} else {
System.out.println("支付失敗,錯(cuò)誤信息：" + packageParams.get("err_code"));
resXml = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>"
+ "<return_msg><![CDATA[報(bào)文為空]]></return_msg>" + "</xml> ";
}
//------------------------------
//處理業(yè)務(wù)完畢
//------------------------------
BufferedOutputStream out = new BufferedOutputStream(
response.getOutputStream());
out.write(resXml.getBytes());
out.flush();
out.close();
} else{
System.out.println("通知簽名驗(yàn)證失敗");
}
}
}開始重構(gòu)
上面兩個(gè)Servlet像極了，獲取請(qǐng)求數(shù)據(jù)，驗(yàn)證數(shù)據(jù)，支付成功判斷，執(zhí)行成功業(yè)務(wù)邏輯...，這不是模版模式的應(yīng)用嗎？對(duì)，但是這里先用策略模式重構(gòu)下支付回調(diào)的問(wèn)題?。。?/p>
定義一個(gè)支付工具類PayNotifyUtil執(zhí)行以上步驟，將具體怎么執(zhí)行交給策略類來(lái)做，AliPayNotifyPloyImpl和WeChatPayNotifyPloyImpl, 這樣在Servlet中就無(wú)須關(guān)心是什么支付平臺(tái)回調(diào)的。
目錄結(jié)構(gòu)
Servlet代碼
只需要關(guān)注使用的什么支付策略?。?！
**
* 支付寶支付回調(diào)通知
*/@WebServlet("/pay/notify/alipay.do")
public class AlipayNotifyServlet extends HttpServlet { @Override
public void service(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { // 1. 獲得支付策略
PayNotifyPloy payNotifyPloy = new AliPayNotifyPloyImpl(); PayNotifyUtil payNotifyUtil = new PayNotifyUtil(payNotifyPloy); // 2. 獲得請(qǐng)求參數(shù)
Map<String, String> payInfo = payNotifyUtil.loadPayData(request); // 3. 驗(yàn)證支付數(shù)據(jù)
String result=""; if( !payNotifyUtil.verifyData(payInfo)) { System.out.println("驗(yàn)證失敗");
} else if (!payNotifyUtil.isPaySuccess(payInfo) ) { // 支付失敗
result = payNotifyUtil.getFailedResponseData();
} else { //4. 執(zhí)行業(yè)務(wù)邏輯
OrderMode orderMode = payNotifyUtil.getServiceMode(payInfo); // 修改訂單狀態(tài)
UserService userService = ServiceFactory.getService(UserService.class); try {
userService.paySuccess(orderMode.getTradeNo(), orderMode.getTotalFee(), PayWayEnum.ALIPAY); // 支付成功數(shù)據(jù)
result = payNotifyUtil.getSuccessfulResponseData();
} catch (Exception e) { // 邏輯執(zhí)行失敗，等同于支付失敗，所以返回失敗數(shù)據(jù)
result = payNotifyUtil.getFailedResponseData();
}
}
response.reset(); PrintWriter out = response.getWriter(); // 返回?cái)?shù)據(jù)
out.print(result);
out.flush();
}
}將來(lái)的某一天，需要增加微信支付功能，對(duì)應(yīng)微信支付回調(diào)，只需要copy上面代碼然后，修改策略的實(shí)現(xiàn)類即可。
這個(gè)時(shí)候IDEA IDE提示發(fā)現(xiàn)---WeChatPayNotifyServlet和AliPayNotifyServlet代碼重復(fù)，是時(shí)候應(yīng)用使用模版方法重構(gòu)了
PayNotifyUtil工具類
/**
* 支付之付款工具類
* Created by luokaiqiongmou on 2017/2/25.
*/public class PayNotifyUtil { // 支付策略
private PayNotifyPloy payNotifyPloy; public PayNotifyUtil(PayNotifyPloy payNotifyPloy) { this.payNotifyPloy = payNotifyPloy;
} // 加載支付信息
public Map<String, String> loadPayData(HttpServletRequest request) throws IOException { return payNotifyPloy.loadPayInfo(request);
} // 驗(yàn)證參數(shù)
public boolean verifyData(Map<String, String> postData) { return payNotifyPloy.verifyData(postData);
} // 判斷是否支付成功
public boolean isPaySuccess(Map<String, String> data) { return payNotifyPloy.isPaySuccess(data);
} // 獲得支付成功的返回?cái)?shù)據(jù)
public String getSuccessfulResponseData() { return payNotifyPloy.getSuccessfulResponseData();
} // 獲得支付失敗的返回?cái)?shù)據(jù)
public String getFailedResponseData() { return payNotifyPloy.getFailedResponseData();
} // 獲得業(yè)務(wù)結(jié)果需要的數(shù)據(jù)
public OrderMode getServiceMode(Map<String, String> params) { return payNotifyPloy.getServiceMode(params);
}
}策略接口
/**
* 支付回調(diào)策略接口
* Created by luokaiqiongmou on 2017/2/25.
*/public interface PayNotifyPloy { // 加載支付回調(diào)信息
Map<String, String> loadPayInfo(HttpServletRequest request) throws IOException; // 獲得返回給支付平臺(tái)代表成功的
String getSuccessfulResponseData(); // 獲得返回給支付平臺(tái)代表失敗
String getFailedResponseData(); // 判斷是否支付成功
boolean isPaySuccess(Map<String, String> data); // 驗(yàn)證數(shù)據(jù)的合法性
boolean verifyData(Map<String, String> postData); // 獲得需要的信息（比如支付的訂單號(hào)、支付的金額）
OrderMode getServiceMode(Map<String, String> params);
}現(xiàn)在你可以定義你的具體平臺(tái)的實(shí)現(xiàn)類了?。。?/p>
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請(qǐng)你相信，一切終有回甘