最近做了公众号的微信支付，想起来之前的第三方易宝支付，重新实现理解了一下。无论是微信，还是易宝。整个支付过程都是设置一些参数，然后提交给支付网关，最后返回数据，针对业务进行操作。

商户公司直接与银行对接和通过中间公司与银行对接

直接银行对接

  1.优点：安全，适用于资金流量比较大的企业

  2.缺点：开发工作量大，维护工作量大，缴纳接口使用费

中间公司对接

  1.优点：开发工作量小，维护工作量小，适用于资金流量小的企业

  2.缺点：不安全

规范：

  MD5-hmac:秘密的秘钥验证算法。hmac提供的数据完整性和源身份验证完全取决于秘钥分配的范围。如果只要发送者和接收者知道hmac秘钥，那么这就对两者间发送的数据提供了源身份验证和完整性保证

通过http向易宝支付网关发送请求，请求可以是get和post，页面采用GBK

  易宝支付网关对对企业发来的数据，使用用户的密钥生成MD5-hmac码，然后跟企业发来的MD5-hmac码对比，相同则把请求转发给银行网关，用户支付完成后，银行网关引导用户重定向到易宝支付网关，易宝支付网关再引导用户重定向到企业制定的URL

使用intellij idea对代码实现

  1.首先创建一个java Web工程  http://www.cnblogs.com/yangyquin/p/5285272.html

  2.完整的站点地图

 3.执行流程

    1.web.xml，引导进入index.jsp
2.表单提交，action=${pageContext.request.contextPath}/servlet/yeepay/paymentRequest
3.web.xml中配置的Servlet，进入com.dynamic.servlet.PaymentRequest
4.配置参数，转发到connection.jsp中
5.向易宝网关提交请求，请求中包括企业回调业务地址，请求完成后回调               http://localhost:5050/servlet/yeepay/response
6.web.xml中配置的Servlet，进入com.dynamic.servlet.PaymentResutlResponse
7.校验MD5-hmac,成功，执行企业业务代码，数据保存到数据库中

  4.代码实现

  web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"version="3.1"><servlet><description>发起支付请求</description><display-name>发起支付请求</display-name><servlet-name>PaymentRequest</servlet-name><servlet-class>com.dynamic.servlet.PaymentRequest</servlet-class></servlet><servlet><description>响应支付结果请求</description><display-name>响应支付结果请求</display-name><servlet-name>PaymentResutlResponse</servlet-name><servlet-class>com.dynamic.servlet.PaymentResutlResponse</servlet-class></servlet><servlet-mapping><servlet-name>PaymentRequest</servlet-name><url-pattern>/servlet/yeepay/paymentRequest</url-pattern></servlet-mapping><servlet-mapping><servlet-name>PaymentResutlResponse</servlet-name><url-pattern>/servlet/yeepay/response</url-pattern></servlet-mapping><welcome-file-list><welcome-file>index.jsp</welcome-file></welcome-file-list></web-app>

merchantInfo.properties,属性文件，指定参数

p1_MerId=10001126856 #商家ID
keyValue=69cl522AV6q613Ii4W6u8K6XuW8vM1N6bFgyv769220IuYe9u37N4y7rI4Pl #商户密钥
merchantCallbackURL=http://localhost:5050/servlet/yeepay/response #商户接收支付成功数据的地址

configInfo，读取属性文件

package com.dynamic.util;import java.util.Properties;/*** Created by fxq on 2017/5/12.*/
public class ConfigInfo {private static Properties cache = new Properties();static {try {cache.load(ConfigInfo.class.getClassLoader().getResourceAsStream("merchantInfo.properties"));}catch (Exception e){e.printStackTrace();}}public static String getValue(String key){return cache.getProperty(key);}}

DigestUtil,加密工具类

package com.dynamic.util;import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;/*** Created by fxq on 2017/5/12.*/
public class DigestUtil {private static String encodingCharset = "UTF-8";public static String hmacSign(String aValue,String aKey){byte k_ipad[] = new byte[64];byte k_opad[] = new byte[64];byte keyb[];byte value[];try{keyb= aKey.getBytes(encodingCharset);value = aValue.getBytes(encodingCharset);}catch(UnsupportedEncodingException e){keyb = aKey.getBytes();value = aValue.getBytes();}Arrays.fill(k_ipad,keyb.length,64,(byte)54);Arrays.fill(k_opad,keyb.length,64,(byte)92);for(int i =0 ; i<keyb.length; i++){k_ipad[i] = (byte) (keyb[i] ^ 0x36);k_opad[i] = (byte) (keyb[i] ^ 0x5c);}MessageDigest md = null;try{md = MessageDigest.getInstance("MD5");}catch(NoSuchAlgorithmException e){return null;}md.update(k_ipad);md.update(value);byte dg[] = md.digest();md.reset();md.update(k_opad);md.update(dg,0,16);dg = md.digest();return toHex(dg);}public static String toHex(byte input[]){if(input == null)return null;StringBuffer output = new StringBuffer(input.length *2);for(int i=0;i<input.length;i++){int current = input[i] & 0xff;if(current < 16)output.append("0");output.append(Integer.toString(current,16));}return output.toString();}public static String getHmac(String[] args,String key){if(args ==null || args.length ==0){return (null);}StringBuffer str = new StringBuffer();for(int i =0 ;i<args.length;i++){str.append(args[i]);}return (hmacSign(str.toString(),key));}public static String digest(String aValue){aValue = aValue.trim();byte value[];try{value = aValue.getBytes(encodingCharset);}catch(UnsupportedEncodingException e){value = aValue.getBytes();}MessageDigest md = null;try{md = MessageDigest.getInstance("SHA");}catch(NoSuchAlgorithmException e){e.printStackTrace();return null;}return toHex(md.digest(value));}/*public static void main(String[] args){System.out.println(hmacSign("AnnulCard1000043252120080620160450.0http://localhost/SZXpro/callback.asp杩?4564868265473632445648682654736324511","8UPp0KE8sq73zVP370vko7C39403rtK1YwX40Td6irH216036H27Eb12792t"));}*/}

PaymentUtil,生成hmac和校验hmac

package com.dynamic.util;/*** Created by fxq on 2017/5/12.*/
public class PaymentUtil {/*** 生成hmac方法** @param p0_Cmd 业务类型* @param p1_MerId 商户编号* @param p2_Order 商户订单号* @param p3_Amt 支付金额* @param p4_Cur 交易币种* @param p5_Pid 商品名称* @param p6_Pcat 商品种类* @param p7_Pdesc 商品描述* @param p8_Url 商户接收支付成功数据的地址* @param p9_SAF 送货地址* @param pa_MP 商户扩展信息* @param pd_FrpId 银行编码* @param pr_NeedResponse 应答机制* @param keyValue 商户密钥* @return*/public static String buildHmac(String p0_Cmd,String p1_MerId,String p2_Order,String p3_Amt,String p4_Cur,String p5_Pid,String p6_Pcat,String p7_Pdesc,String p8_Url,String p9_SAF,String pa_MP,String pd_FrpId,String pr_NeedResponse,String keyValue){StringBuffer sValue = new StringBuffer();//业务类型sValue.append(p0_Cmd);//商户编号sValue.append(p1_MerId);//商户订单号sValue.append(p2_Order);//支付金额sValue.append(p3_Amt);//交易币种sValue.append(p4_Cur);//商品名称sValue.append(p5_Pid);//商品种类sValue.append(p6_Pcat);//商品描述sValue.append(p7_Pdesc);//商品接收支付成功数据的地址sValue.append(p8_Url);//送货地址sValue.append(p9_SAF);//商户扩展信息sValue.append(pa_MP);//银行编码sValue.append(pd_FrpId);//应答机制sValue.append(pr_NeedResponse);String sNewString = DigestUtil.hmacSign(sValue.toString(),keyValue);return sNewString;}/*** 返回校验hmac方法** @param hmac 支付网关发来的加密验证码* @param p1_MerId 商户编号* @param r0_Cmd 业务类型* @param r1_Code 支付结果* @param r2_TrxId 易宝支付交易流水号* @param r3_Amt 支付金额* @param r4_Cur 交易币种* @param r5_Pid 商品名称* @param r6_Order 商户订单号* @param r7_Uid 易宝支付会员ID* @param r8_MP 商户扩展信息* @param r9_BType 交易结果返回类型* @param keyValue 密钥* @return*/public static boolean verifyCallback(String hmac,String p1_MerId,String r0_Cmd,String r1_Code,String r2_TrxId,String r3_Amt,String r4_Cur,String r5_Pid,String r6_Order,String r7_Uid,String r8_MP,String r9_BType,String keyValue){StringBuffer sValue = new StringBuffer();//商户编号sValue.append(p1_MerId);//业务类型sValue.append(r0_Cmd);//支付结果sValue.append(r1_Code);//易宝支付交易流水号sValue.append(r2_TrxId);//支付金额sValue.append(r3_Amt);//交易币种sValue.append(r4_Cur);//商品名称sValue.append(r5_Pid);//商户订单号sValue.append(r6_Order);//易宝支付会员IDsValue.append(r7_Uid);//商户扩展信息sValue.append(r8_MP);//交易结果返回类型sValue.append(r9_BType);String sNewString = DigestUtil.hmacSign(sValue.toString(),keyValue);if(hmac.equals(sNewString)){return true;}return false;}}

两个Servlet

  PaymentRequest

package com.dynamic.servlet;import com.dynamic.util.ConfigInfo;
import com.dynamic.util.PaymentUtil;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;/*** Created by fxq on 2017/5/12.*/
public class PaymentRequest extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {this.doPost(request, response);}@Overridepublic void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("GBK");String orderid = request.getParameter("orderid");//订单号String amount = request.getParameter("amount");//支付金额String pd_FrpId = request.getParameter("pd_FrpId");//选择的支付银行String p1_MerId = ConfigInfo.getValue("p1_MerId");String keyValue = ConfigInfo.getValue("keyValue");String merchantCallbackURL = ConfigInfo.getValue("merchantCallbackURL");String messageType = "Buy"; // 请求命令,在线支付固定为BuyString currency = "CNY"; // 货币单位String productDesc = ""; // 商品描述String productCat = ""; // 商品种类String productId = ""; // 商品IDString addressFlag = "0"; // 需要填写送货信息 0：不需要 1:需要String sMctProperties = ""; // 商家扩展信息String pr_NeedResponse = "0"; // 应答机制String md5hmac = PaymentUtil.buildHmac(messageType, p1_MerId, orderid, amount, currency,productId, productCat, productDesc, merchantCallbackURL, addressFlag, sMctProperties,pd_FrpId, pr_NeedResponse, keyValue);request.setAttribute("messageType", messageType);request.setAttribute("merchantID", p1_MerId);request.setAttribute("orderId", orderid);request.setAttribute("amount", amount);request.setAttribute("currency", currency);request.setAttribute("productId", productId);request.setAttribute("productCat", productCat);request.setAttribute("productDesc", productDesc);request.setAttribute("merchantCallbackURL", merchantCallbackURL);request.setAttribute("addressFlag", addressFlag);request.setAttribute("sMctProperties", sMctProperties);request.setAttribute("frpId", pd_FrpId);request.setAttribute("pr_NeedResponse", pr_NeedResponse);request.setAttribute("hmac", md5hmac);request.getRequestDispatcher("/WEB-INF/page/connection.jsp").forward(request, response);}
}

PaymentResutlResponse

package com.dynamic.servlet;import com.dynamic.util.ConfigInfo;
import com.dynamic.util.PaymentUtil;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;/*** Created by fxq on 2017/5/12.*/
public class PaymentResutlResponse extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {this.doPost(request, response);}@Overrideprotected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {request.setCharacterEncoding("GBK");String merchantID = ConfigInfo.getValue("p1_MerId");//商家IDString keyValue = ConfigInfo.getValue("keyValue");//商家密钥String sCmd = request.getParameter("r0_Cmd");//业务类型String sResultCode = request.getParameter("r1_Code");//扣款结果 ，1表示扣款成功String sTrxId = request.getParameter("r2_TrxId");//YeePay易宝交易订单号String amount = request.getParameter("r3_Amt");//扣款金额，交易结束后，YeePay易宝交易系统将实际扣费金额返回给商户String currency = request.getParameter("r4_Cur");//交易币种，人民币为CNY;String productId = request.getParameter("r5_Pid");//商品IDString orderId = request.getParameter("r6_Order");//商户订单号String userId = request.getParameter("r7_Uid");//YeePay易宝会员IDString mp = request.getParameter("r8_MP");//商户扩展信息，可以任意填写1K的字符串，交易返回时将原样返回String bType = request.getParameter("r9_BType");//交易结果通知类型 1：交易成功回调（浏览器重定向） 2:交易成功主动通知（服务器点对点通讯）String rb_BankId = request.getParameter("rb_BankId");//支付银行String rb_PayDate = request.getParameter("rp_PayDate");//在银行支付时的时间String hmac = request.getParameter("hmac");//MD5交易签名System.out.println("交易签名---->" + hmac);boolean result = PaymentUtil.verifyCallback(hmac,merchantID,sCmd,sResultCode,sTrxId,amount,currency,productId,orderId,userId,mp,bType,keyValue);if(result){if("1".equals(sResultCode)){//把数据库中用户的订单支付状态设置为已完成支付String message = "订单号:"  + orderId + "的订单支付成功了";message += ",用户支付了" + amount + "元";message += ",交易结果通知类型：";if("1".equals(bType)){message += "浏览器重定向";}else if("2".equals(bType)){message += "易宝支付网关后台程序通知";}message +=",易宝订单系统中的订单号：" +sTrxId;request.setAttribute("message",message);}else{request.setAttribute("message","用户支付失败");}}else{request.setAttribute("message","数据来源不合法");}request.getRequestDispatcher("/WEB-INF/page/paymentResult.jsp").forward(request,response);}
}

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head><title>支付第一步,选择支付银行</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"></head><body>
<table width="960" border="0" align="center"><tr><td width="536" valign="top"><form action="${pageContext.request.contextPath}/servlet/yeepay/paymentRequest" method="post" name="paymentform"><table width="100%" border="0"><tr><td height="30" colspan="4"><table width="100%" height="50" border="0" cellpadding="0" cellspacing="1" bgcolor="#A2E0FF"><tr><td align="center" bgcolor="#F7FEFF"><h3>订单号：<INPUT TYPE="text" NAME="orderid"> 应付金额：￥<INPUT TYPE="text" NAME="amount" size="6">元</h3></td></tr></table></td></tr><tr><td colspan="4"> </td></tr><tr><td height="30" colspan="4" bgcolor="#F4F8FF"><span class="STYLE3">请您选择在线支付银行</span> </td></tr><tr><td width="26%" height="25"><INPUT TYPE="radio" NAME="pd_FrpId" value="CMBCHINA-NET">招商银行 </td><td width="25%" height="25"><INPUT TYPE="radio" NAME="pd_FrpId" value="ICBC-NET">工商银行</td><td width="25%" height="25"><INPUT TYPE="radio" NAME="pd_FrpId" value="ABC-NET">农业银行</td><td width="24%" height="25"><INPUT TYPE="radio" NAME="pd_FrpId" value="CCB-NET">建设银行 </td></tr><tr><td height="25"><INPUT TYPE="radio" NAME="pd_FrpId" value="CMBC-NET">中国民生银行总行</td><td height="25"><INPUT TYPE="radio" NAME="pd_FrpId" value="CEB-NET" >光大银行 </td><td height="25"><INPUT TYPE="radio" NAME="pd_FrpId" value="BOCO-NET">交通银行</td><td height="25"><INPUT TYPE="radio" NAME="pd_FrpId" value="SDB-NET">深圳发展银行</td></tr><tr><td height="25"><INPUT TYPE="radio" NAME="pd_FrpId" value="BCCB-NET">北京银行</td><td height="25"><INPUT TYPE="radio" NAME="pd_FrpId" value="CIB-NET">兴业银行 </td><td height="25"><INPUT TYPE="radio" NAME="pd_FrpId" value="SPDB-NET">上海浦东发展银行 </td><td ><INPUT TYPE="radio" NAME="pd_FrpId" value="ECITIC-NET">中信银行</td></tr><tr><td colspan="4"> </td></tr><tr><td colspan="4" align="center"><input type="submit" value=" 确认支付 " /></td></tr></table></form>	</td><td colspan="2" valign="top"><div class="divts"><table width="400" border="0" align="center" cellpadding="5" cellspacing="0"><tr><td bgcolor="#F4F8FF"><span class="STYLE5"> 温馨提示</span></td></tr><tr><td><ul><li> 建行客户需到柜面签约网上银行才能支付</li><li>请关闭弹出窗口拦截功能</li><li>务必使用IE5.0以上浏览器</li><li>支付出错时勿按IE“后退”键</li></ul></td></tr></table></div><div id="blankmessage"></div>	</td></tr><tr><td> </td><td width="290"> </td><td width="120"> </td></tr>
</table>
</body>
</html>

connection.jsp

<%@ page language="java" pageEncoding="GBK"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head><title>发起支付请求</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">
</head><body >
<!-- http://tech.yeepay.com:8080/robot/debug.action
https://www.yeepay.com/app-merchant-proxy/node
οnlοad="javascript:document.forms[0].submit()"-->
<form name="yeepay" action="https://www.yeepay.com/app-merchant-proxy/node" method='post'><input type='hidden' name='p0_Cmd'   value="${messageType}"> <!-- 请求命令,在线支付固定为Buy --><input type='hidden' name='p1_MerId' value="${merchantID}"> <!-- 商家ID --><input type="hidden" name="p2_Order" value="${orderId}"> <!-- 商家的交易定单号 --><input type='hidden' name='p3_Amt'   value="${amount}"> <!-- 订单金额 --><input type='hidden' name='p4_Cur'   value="${currency}"> <!-- 货币单位 --><input type='hidden' name='p5_Pid'   value="${productId}"> <!-- 商品ID --><input type='hidden' name='p6_Pcat'  value="${productCat}"> <!-- 商品种类 --><input type='hidden' name='p7_Pdesc' value="${productDesc}"> <!-- 商品描述 --><input type='hidden' name='p8_Url'   value="${merchantCallbackURL}"> <!-- 交易结果通知地址 --><input type='hidden' name='p9_SAF'   value="${addressFlag}"> <!-- 需要填写送货信息 0：不需要 1:需要 --><input type='hidden' name='pa_MP'    value="${sMctProperties}"> <!-- 商家扩展信息 --><input type='hidden' name='pd_FrpId' value="${frpId}"> <!-- 银行ID --><!-- 应答机制 为“1”: 需要应答机制;为“0”: 不需要应答机制 --><input type="hidden" name="pr_NeedResponse"  value="0"><input type='hidden' name='hmac' value="${hmac}"><!-- MD5-hmac验证码 --><input type="submit" value="发送">
</form>
</body>
</html>

paymentResult.jsp

<%@ page language="java" pageEncoding="GBK"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head><title>支付结果</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">
</head><body >
<center><h3><font color="red">${message }
</font></h3></center>
</body>
</html>

  系统为Servlet项目，实现了向易宝发起支付，并支付成功回调企业业务。

git源代码下载

  稍后更新，，，