利用javaweb实现一个在线支付功能

package com.learning.web.servlet;import java.io.IOException;import java.util.ResourceBundle;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.learning.utils.PaymentUtil;@WebServlet("/payOnline")public class PayOnline extends HttpServlet {  private static final long serialVersionUID = 1L;      protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {      doPost(request, response);  }  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {      String orderid = request.getParameter("orderid");    String money = request.getParameter("money");            // 银行        String pd_FrpId = request.getParameter("pd_FrpId");        // 发给支付公司需要哪些数据        String p0_Cmd = "Buy";        String p1_MerId = ResourceBundle.getBundle("/WEB-INF/classes/merchantInfo").getString(            "p1_MerId");        String p2_Order = orderid;        String p3_Amt = money;        String p4_Cur = "CNY";        String p5_Pid = "";        String p6_Pcat = "";        String p7_Pdesc = "";        // 支付成功回调地址 ---- 第三方支付公司会访问、用户访问        // 第三方支付可以访问网址(本项目网址)        String p8_Url = "http://115.170.37.189/day19pay/callback";        String p9_SAF = "";        String pa_MP = "";        String pr_NeedResponse = "1";        // 加密hmac 需要密钥        String keyValue = ResourceBundle.getBundle("merchantInfo").getString(            "keyValue");        String hmac = PaymentUtil.buildHmac(p0_Cmd, p1_MerId, p2_Order, p3_Amt,            p4_Cur, p5_Pid, p6_Pcat, p7_Pdesc, p8_Url, p9_SAF, pa_MP,            pd_FrpId, pr_NeedResponse, keyValue);        // 生成url --- url?        request.setAttribute("pd_FrpId", pd_FrpId);        request.setAttribute("p0_Cmd", p0_Cmd);        request.setAttribute("p1_MerId", p1_MerId);        request.setAttribute("p2_Order", p2_Order);        request.setAttribute("p3_Amt", p3_Amt);        request.setAttribute("p4_Cur", p4_Cur);        request.setAttribute("p5_Pid", p5_Pid);        request.setAttribute("p6_Pcat", p6_Pcat);        request.setAttribute("p7_Pdesc", p7_Pdesc);        request.setAttribute("p8_Url", p8_Url);        request.setAttribute("p9_SAF", p9_SAF);        request.setAttribute("pa_MP", pa_MP);        request.setAttribute("pr_NeedResponse", pr_NeedResponse);        request.setAttribute("hmac", hmac);        request.getRequestDispatcher("/confirm.jsp").forward(request, response);          }}