轉：http://gavin-chen.iteye.com/blog/257864
剛在Javaeye看到一篇文章，關于網站集成支付寶的，正是我之前想了解的，不過作者寫得有些零亂，解釋也不太清楚，代碼格式更是看著郁悶，待以后有空消化消化，再實踐下，現先貼出來保存著吧。
（本文轉載于http://stephen830.iteye.com/blog/254827)
國內電子商務系統實現的基本流程如下：
客戶在系統內下訂單 -> 系統根據訂單生成支付寶接口url -> 客戶通過url使用支付寶（網上銀行）付款 -> 支付寶將客戶的付款完成信息發送給電子商務系統 -> 系統收到支付寶信息后確定客戶訂單已經付款 -> 進行發貨等后續流程。
在開始下面的內容之前,你要先有一個支付寶賬戶,如果要集成支付寶接口,你還必須申請開通服務(關于如何開通,可以直接到支付寶網站上申請).在服務開通后,支付寶會給你2個字符串編號:1個partnerId(合作伙伴ID),還有1個securityCode(安全碼).當你拿到這2個碼的時候就可以開始下面的內容了.
（1）如何調用支付寶接口？（將客戶的訂單信息按照既定的規則生成一個url跳轉到支付寶網站）
通過下面方法[makeOrderAlipayUrl(HttpServletRequest httpRequest,Order order)]的調用得到支付寶的url,然后進行跳轉(response.sendRedirect(url);).
Java代碼
??? ??? public static String makeOrderAlipayUrl(HttpServletRequest httpRequest,Order order) throws Exception {???? ??????? HashMap hm = new HashMap();???? ??????? hm.put("_input_charset",httpRequest.getCharacterEncoding());? ??????? hm.put("body","您在www.xxx.com上的訂單");? ??????? hm.put("discount","-5");? ??????? hm.put("logistics_fee","10");? ??????? hm.put("logistics_payment","BUYER_PAY");? ??????? hm.put("logistics_type","EXPRESS");? ??????? hm.put("notify_url","http://www.xxx.com/notifyurl.jsp");//客戶付款后,支付寶調用的頁面???? ??????? hm.put("out_trade_no",order.getId());? ??????? hm.put("partner",partnerId);? ??????? hm.put("agent",partnerId);? ??????? hm.put("payment_type","1");? ??????? hm.put("price","105.30");? ??????? hm.put("quantity","1");? ??????? hm.put("return_url","http://www.xxx.com/ReturnUrl.jsp");//客戶付款成功后,顯示給客戶的頁面???? ??????? hm.put("seller_email","alipay@xxx.com");? ??????? hm.put("service","create_direct_pay_by_user");? ??????? hm.put("subject","www.xxx.com的訂單");? ??????? String payGateway = "https://www.alipay.com/cooperate/gateway.do?";//跳轉到支付寶的url頭???? ??????? return makeUrl(hm,securityCode,httpRequest.getCharacterEncoding(),payGateway);? ??? }???? ???????? ???????? ??? ??? ??? public static String makeUrl(HashMap hm,String securityCode,String charset,String payGateway) throws Exception{???? ??????? List keys = new ArrayList(hm.keySet());???? ??????? Collections.sort(keys);? ??????? StringBuffer content = new StringBuffer();???? ??????? for (int i = 0; i < keys.size(); i++) {???? ??????????? content.append((String) keys.get(i));???? ??????????? content.append("=");???? ??????????? content.append((String) hm.get((String) keys.get(i)));???? ??????????? if (i != keys.size() - 1) {???? ??????????????? content.append("&");???? ??????????? }???? ??????? }???? ??????? content.append(securityCode);???? ??????? String sign = md5(content.toString(),charset);???? ??????? content.delete(0,content.length());???? ??????? content.append(payGateway);???? ??????? for (int i = 0; i < keys.size(); i++) {???? ??????????? content.append(keys.get(i));???? ??????????? content.append("=");???? ??????????? content.append(URLEncoder.encode((String) hm.get(keys.get(i)), charset));???? ??????????? content.append("&");???? ??????? }???? ??????? content.append("sign=");???? ??????? content.append(sign);???? ??????? content.append("&sign_type=MD5");???? ??????? keys.clear();???? ??????? keys = null;???? ??????? return content.toString();???? ??? }???? ???????? ??? ??? ??? public static String md5(String str,String charset) {???? ??????? if (str == null)???? ??????????? return null;???? ??????? char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',???? ??????????????? 'a', 'b', 'c', 'd', 'e', 'f' };???? ???????????? ??????? MessageDigest md5MessageDigest = null;???? ??????? byte[] md5Bytes = null;???? ??????? char md5Chars[] = null;???? ??????? byte[] strBytes = null;???? ??????? try {???? ??????????? strBytes = str.getBytes(charset);???? ??????????? md5MessageDigest = MessageDigest.getInstance("MD5");???? ??????????? md5MessageDigest.update(strBytes);???? ??????????? md5Bytes = md5MessageDigest.digest();???? ??????????? int j = md5Bytes.length;???? ??????????? md5Chars = new char[j * 2];???? ??????????? int k = 0;???? ??????????? for (int i = 0; i < j; i++) {???? ??????????????? byte md5Byte = md5Bytes[i];???? ??????????????? md5Chars[k++] = hexDigits[md5Byte >>> 4 & 0xf];???? ??????????????? md5Chars[k++] = hexDigits[md5Byte & 0xf];???? ??????????? }???? ??????????? return new String(md5Chars);???? ??????? } catch (NoSuchAlgorithmException e) {???? ??????????? ? ??????????? return null;???? ??????? } catch (UnsupportedEncodingException e) {???? ??????????? ? ??????????? return null;???? ??????? } finally {???? ??????????? md5MessageDigest = null;???? ??????????? strBytes = null;???? ??????????? md5Bytes = null;???? ??????? }???? ??? }???
/** * 根據訂單生成支付寶接口URL. * @param httpRequest * @param order 訂單實例 * @return * @throws Exception */ public static String makeOrderAlipayUrl(HttpServletRequest httpRequest,Order order) throws Exception { HashMap hm = new HashMap(); hm.put("_input_charset",httpRequest.getCharacterEncoding());//采用相同的編碼方式 hm.put("body","您在www.xxx.com上的訂單");//填寫在跳到支付寶頁面上顯示的付款內容信息 hm.put("discount","-5");//填寫折扣信息 -5表示抵扣5元 hm.put("logistics_fee","10");//物流費用 hm.put("logistics_payment","BUYER_PAY");//物流費用支付人 BUYER_PAY=買家支付物流費用 hm.put("logistics_type","EXPRESS");//物流方式 hm.put("notify_url","http://www.xxx.com/notifyurl.jsp");//客戶付款后,支付寶調用的頁面 hm.put("out_trade_no",order.getId());//外部交易號,最好具有唯一性,在獲取支付寶發來的付款信息時使用. hm.put("partner",partnerId);//partnerId(合作伙伴ID) hm.put("agent",partnerId);//partnerId(合作伙伴ID) hm.put("payment_type","1");//支付類型 1=商品購買,2=服務購買,... hm.put("price","105.30");//訂單金額信息 hm.put("quantity","1");//訂單商品數量,一般都是寫1,它是按照整個訂單包來計算 hm.put("return_url","http://www.xxx.com/ReturnUrl.jsp");//客戶付款成功后,顯示給客戶的頁面 hm.put("seller_email","alipay@xxx.com");//你的支付寶賬戶email hm.put("service","create_direct_pay_by_user");//create_direct_pay_by_user=直接付款,trade_create_by_buyer 擔保付款 hm.put("subject","www.xxx.com的訂單");//填寫在跳到支付寶頁面上顯示的付款標題信息 String payGateway = "https://www.alipay.com/cooperate/gateway.do?";//跳轉到支付寶的url頭 return makeUrl(hm,securityCode,httpRequest.getCharacterEncoding(),payGateway);//securityCode(安全碼) } /** * 根據傳入的參數生成alipay的支付URL * @param hm 參數值 * @param securityCode 安全碼 * @param charset 編碼 * @param payGateway 支付寶gateway * @return */ public static String makeUrl(HashMap hm,String securityCode,String charset,String payGateway) throws Exception{ List keys = new ArrayList(hm.keySet()); Collections.sort(keys);//支付寶要求參數必須按字母排序 StringBuffer content = new StringBuffer(); for (int i = 0; i < keys.size(); i++) { content.append((String) keys.get(i)); content.append("="); content.append((String) hm.get((String) keys.get(i))); if (i != keys.size() - 1) { content.append("&"); } } content.append(securityCode); String sign = md5(content.toString(),charset); content.delete(0,content.length()); content.append(payGateway); for (int i = 0; i < keys.size(); i++) { content.append(keys.get(i)); content.append("="); content.append(URLEncoder.encode((String) hm.get(keys.get(i)), charset)); content.append("&"); } content.append("sign="); content.append(sign); content.append("&sign_type=MD5"); keys.clear(); keys = null; return content.toString(); } /** * 生成md5編碼字符串. * @param str 源字符串 * @param charset 編碼方式 * @return * */ public static String md5(String str,String charset) { if (str == null) return null; char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; MessageDigest md5MessageDigest = null; byte[] md5Bytes = null; char md5Chars[] = null; byte[] strBytes = null; try { strBytes = str.getBytes(charset); md5MessageDigest = MessageDigest.getInstance("MD5"); md5MessageDigest.update(strBytes); md5Bytes = md5MessageDigest.digest(); int j = md5Bytes.length; md5Chars = new char[j * 2]; int k = 0; for (int i = 0; i < j; i++) { byte md5Byte = md5Bytes[i]; md5Chars[k++] = hexDigits[md5Byte >>> 4 & 0xf]; md5Chars[k++] = hexDigits[md5Byte & 0xf]; } return new String(md5Chars); } catch (NoSuchAlgorithmException e) { //Log.output(e.toString(), Log.STD_ERR); return null; } catch (UnsupportedEncodingException e) { //Log.output(e.toString(), Log.STD_ERR); return null; } finally { md5MessageDigest = null; strBytes = null; md5Bytes = null; } }
當客戶通過接口url付款后,支付寶會自動的去調用前面提供的[notify_url]參數中的url.
（2）支付寶將付款信息返回給系統
當客戶付款后，支付寶就會自動調用上面表單提供的[notify_url]，下面是一個[notifyurl.jsp]的一個例子：
Java代碼
<%@ page contentType="text/html;charset=UTF-8"%><%@ page import="com.soft4j.AlipayMgr"%><%???? ??? String ret = AlipayMgr.insert(request);???? ??? if(ret==null){???? ??????? out.print("success");? ??? }else{???? ??????? out.print("fail");? ??? }???? %>?
<%@ page contentType="text/html;charset=UTF-8"%><%@ page import="com.soft4j.AlipayMgr"%><% String ret = AlipayMgr.insert(request); if(ret==null){ out.print("success");//成功接收支付寶發來的付款信息 }else{ out.print("fail");//出錯 }
%>
?
?
如果確認收到支付寶發來的客戶付款信息，則返回"success"，這樣子支付寶就知道系統已經收到信息了；否則返回"fail"，這樣支付寶會過一段時間后再次發來。其實，只有當支付寶收到"success"的返回信息后才會停止發送付款信息，否則會自動的每隔一段時間就調用上面
的[notify_url]通信接口。
（3）系統處理支付寶發來的付款信息
Java代碼
??? package com.soft4j;???? ??? import java.sql.Connection;???? import java.sql.SQLException;???? import java.util.Enumeration;???? import java.util.Vector;???? import javax.servlet.http.HttpServletRequest;???? ??? ??? public final class NotifyUrlMgr {???? ???????? ???????? ??? public static String insert(HttpServletRequest httpRequest) {???? ???????????? ??????? ? ??????? Enumeration parameterNames = null;???? ??????? String parameterName = null;???? ??????? String parameterValue = null;???? ??????? int count = 0;???? ??????? Vector[] params = null;???? ??????? Vector vParameterName = new Vector();???? ??????? Vector vParameterValue = new Vector();???? ???????????? ??????? try {???? ??????????? String orderId = httpRequest.getParameter("out_trade_no");? ??????????? if(orderId==null||"".equals(orderId)) orderId="-1";???? ??????????? parameterNames = httpRequest.getParameterNames();???? ??????????? boolean isPrint = false;???? ??????????? while (parameterNames.hasMoreElements()) {? ??????????????? parameterName = (String) parameterNames.nextElement();???? ??????????????? parameterValue = httpRequest.getParameter(parameterName);???? ??????????????? if(parameterValue==null) parameterValue="";???? ??????????????? vParameterName.add(parameterName);???? ??????????????? vParameterValue.add(parameterValue);???? ??????????????? count++;???? ??????????? }???? ???????????????? ??????????? ? ???????????????? ??????????? return null;???? ??????? } catch (Exception e) {???? ??????????? return e.toString();???? ??????? } finally {???? ??????????? ? ??????? }???? ??? }???? ??? }?
/* * Created on 2005-6-12 * Author stephen * Email zhoujianqiang AT gmail DOT com * CopyRight(C)2005-2008 , All rights reserved. */
package com.soft4j; import java.sql.Connection;
import java.sql.SQLException;
import java.util.Enumeration;
import java.util.Vector;
import javax.servlet.http.HttpServletRequest; /** * 支付寶付款通知接口. * * @author stephen * @version 1.0.0 */
public final class NotifyUrlMgr { public static String insert(HttpServletRequest httpRequest) { //定義變量和進行必要的初始化工作 Enumeration parameterNames = null; String parameterName = null; String parameterValue = null; int count = 0; Vector[] params = null; Vector vParameterName = new Vector(); Vector vParameterValue = new Vector(); try { String orderId = httpRequest.getParameter("out_trade_no");//訂單號 if(orderId==null||"".equals(orderId)) orderId="-1"; parameterNames = httpRequest.getParameterNames(); boolean isPrint = false; while (parameterNames.hasMoreElements()) {//循環收取支付寶發來的所有參數信息 parameterName = (String) parameterNames.nextElement(); parameterValue = httpRequest.getParameter(parameterName); if(parameterValue==null) parameterValue=""; vParameterName.add(parameterName); vParameterValue.add(parameterValue); count++; } //這里添加對收到信息的處理:一般是將這些信息存入數據庫,然后對客戶的訂單進行處理. return null; } catch (Exception e) { return e.toString(); } finally { // } } }
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這樣系統可以在客戶使用支付寶付款后,自動的根據支付寶發來的付款信息確認客戶的付款情況,并進行相應的后續操作.
如果你的電子商務系統不是java環境的，也可以參考上面的內容。
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總結
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