最近项目需要微信支付，然后看了下微信公众号支付，，虽然不难，但是细节还是需要注意的，用了大半天时间写了个demo，并且完整的测试了一下支付流程，下面分享一下微信公众号支付的经验。
一、配置公众号微信支付
需要我们配置微信公众号支付地址和测试白名单。
比如：支付JS页面的地址为 http://www.xxx.com/shop/pay/
那此处配置www.xxx.com/shop/pay/
二、开发流程
借用微信公众号支付api(地址 http://pay.weixin.qq.com/wiki/doc/api/index.php?chapter=7_4)，我们需要开发的为红色标记出的。如下：
三、向微信服务器端下订单
调用统一下单接口，这样就能获取微信支付的prepay_id（http://pay.weixin.qq.com/wiki/doc/api/index.php?chapter=9_1）。
在调用该接口前有几个字段是H5支付必须填写的openid
3.1 获取openid
可以通过网页授权形式（http://mp.weixin.qq.com/wiki/17/c0f37d5704f0b64713d5d2c37b468d75.html）
在微信中发送如下链接
https://open.weixin.qq.com/connect/oauth2/authorize?appid=wx520c15f417810387&redirect_uri=要跳转的下订单的url&response_type=code&scope=snsapi_base&state=123#wechat_redirect
3.2 下订单获取prepay_id
代码如下，实际上是通过post发送一个xml 文件，获取微信服务器端发送过来的prepay_id。
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Random;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.codec.digest.DigestUtils;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;
import com.fasterxml.jackson.databind.JsonNode;
import com.gson.oauth.Oauth;
import com.gson.oauth.Pay;
import com.gson.util.HttpKit;
import com.sy.util.DatetimeUtil;
import com.sy.util.JsonUtil;
@Controller
@RequestMapping("/pay")
public class WXPayController {
@RequestMapping(value = "wxprepay.do")
public void jspay(HttpServletRequest request, HttpServletResponse response, String callback) throws Exception {
// 获取openid
String openId = SessionUtil.getAtt(request, "openId");
if (openId == null) {
openId = getUserOpenId(request);
}
String appid = "wx16691fcb0523c1a4";
String paternerKey = "ININGFENG1234567fdfwfdfd1ss234567";
String out_trade_no = getTradeNo();
Map<String, String> paraMap = new HashMap<String, String>();
paraMap.put("appid", appid);
paraMap.put("attach", "测试");
paraMap.put("body", "测试购买支付");
paraMap.put("mch_id", "10283271");
paraMap.put("nonce_str", create_nonce_str());
paraMap.put("openid", openId);
paraMap.put("out_trade_no", out_trade_no);
paraMap.put("spbill_create_ip", getAddrIp(request));
paraMap.put("total_fee", "1");
paraMap.put("trade_type", "JSAPI");
paraMap.put("notify_url", "http://www.xxx.co/bank/page/wxnotify");
String sign = getSign(paraMap, paternerKey);
paraMap.put("sign", sign);
// 统一下单 https://api.mch.weixin.qq.com/pay/unifiedorder
String url = "https://api.mch.weixin.qq.com/pay/unifiedorder";
String xml = ArrayToXml(paraMap);
String xmlStr = HttpKit.post(url, xml);
// 预付商品id
String prepay_id = "";
if (xmlStr.indexOf("SUCCESS") != -1) {
Map<String, String> map = doXMLParse(xmlStr);
prepay_id = (String) map.get("prepay_id");
}
Map<String, String> payMap = new HashMap<String, String>();
payMap.put("appId", appid);
payMap.put("timeStamp", create_timestamp());
payMap.put("nonceStr", create_nonce_str());
payMap.put("signType", "MD5");
payMap.put("package", "prepay_id=" + prepay_id);
String paySign = getSign(payMap, paternerKey);
payMap.put("pg", prepay_id);
payMap.put("paySign", paySign);
WebUtil.response(response, WebUtil.packJsonp(callback, JsonUtil.warpJsonNodeResponse(JsonUtil.objectToJsonNode(payMap)).toString()));
}
/**
* map转成xml
*
* @param arr
* @return
*/
public String ArrayToXml(Map<String, String> arr) {
String xml = "<xml>";
Iterator<Entry<String, String>> iter = arr.entrySet().iterator();
while (iter.hasNext()) {
Entry<String, String> entry = iter.next();
String key = entry.getKey();
String val = entry.getValue();
xml += "<" + key + ">" + val + "</" + key + ">";
}
xml += "</xml>";
return xml;
}
// 获取openId
private String getUserOpenId(HttpServletRequest request) throws Exception {
String code = request.getParameter("code");
if (code == null) {
String openId = request.getParameter("openId");
return openId;
}
Oauth o = new Oauth();
String token = o.getToken(code);
JsonNode node = JsonUtil.StringToJsonNode(token);
String openId = node.get("openid").asText();
return openId;
}
private String create_nonce_str() {
String chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
String res = "";
for (int i = 0; i < 16; i++) {
Random rd = new Random();
res += chars.charAt(rd.nextInt(chars.length() - 1));
}
return res;
}
private String getAddrIp(HttpServletRequest request){
return request.getRemoteAddr();
}
private String create_timestamp() {
return Long.toString(System.currentTimeMillis() / 1000);
}
private String getTradeNo(){
String timestamp = DatetimeUtil.formatDate(new Date(), DatetimeUtil.DATETIME_PATTERN);
return "HZNO" + timestamp;
}
private String getSign(Map<String, String> params, String paternerKey )
throws UnsupportedEncodingException {
String string1 = Pay.createSign(params, false);
String stringSignTemp = string1 + "&key=" + paternerKey;
String signValue = DigestUtils.md5Hex(stringSignTemp).toUpperCase();
return signValue;
}
private Map<String, String> doXMLParse(String xml)
throws XmlPullParserException, IOException {
InputStream inputStream = new ByteArrayInputStream(xml.getBytes());
Map<String, String> map = null;
XmlPullParser pullParser = XmlPullParserFactory.newInstance()
.newPullParser();
pullParser.setInput(inputStream, "UTF-8"); // 为xml设置要解析的xml数据
int eventType = pullParser.getEventType();
while (eventType != XmlPullParser.END_DOCUMENT) {
switch (eventType) {
case XmlPullParser.START_DOCUMENT:
map = new HashMap<String, String>();
break;
case XmlPullParser.START_TAG:
String key = pullParser.getName();
if (key.equals("xml"))
break;
String value = pullParser.nextText();
map.put(key, value);
break;
case XmlPullParser.END_TAG:
break;
}
eventType = pullParser.next();
}
return map;
}
}
四、H5支付
H5支付其实很简单，只需要调用微信内嵌浏览器的js方法就行（http://pay.weixin.qq.com/wiki/doc/api/index.php?chapter=7_7）
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" />
<meta name="apple-mobile-web-app-capable" content="yes" />
<meta name="apple-mobile-web-app-status-bar-style" content="black" />
<meta name="format-detection" content="telephone=no" />
<title>测试支付</title>
<link href="../css/css.css?v=1.0" rel="stylesheet" type="text/css">
</head>
<body>
<div class="index_box">
<div class="apply_name">微信js支付测试</div>
<div class="branch_con">
<ul>
<li><span class="name">测试支付信息</span></li>
</ul>
<p class="cz_btn"><a href="javascript:pay();" class="btn_1">立即支付</a></p>
</div>
</div>
<script type="text/javascript" src="../js/zepto.min.js"></script>
<script type="text/javascript" src="../js/common.js"></script>
<script type="text/javascript">
var appId = urlparameter("appId");
var timeStamp = urlparameter("timeStamp");
var nonceStr = urlparameter("nonceStr");
var pg = urlparameter("pg");
var signType = urlparameter("signType");
var paySign = urlparameter("paySign");
function onBridgeReady(){
WeixinJSBridge.invoke(
'getBrandWCPayRequest', {
"appId" : appId, //公众号名称，由商户传入
"timeStamp": timeStamp, //时间戳，自1970年以来的秒数
"nonceStr" : nonceStr, //随机串
"package" : "prepay_id=" + pg,
"signType" : signType, //微信签名方式:
"paySign" : paySign //微信签名
},
function(res){
if(res.err_msg == "get_brand_wcpay_request:ok" ) {
alert("支付成功");
} // 使用以上方式判断前端返回,微信团队郑重提示：res.err_msg将在用户支付成功后返回 ok，但并不保证它绝对可靠。
}
);
}
function pay(){
if (typeof WeixinJSBridge == "undefined"){
if( document.addEventListener ){
document.addEventListener('WeixinJSBridgeReady', onBridgeReady, false);
}else if (document.attachEvent){
document.attachEvent('WeixinJSBridgeReady', onBridgeReady);
document.attachEvent('onWeixinJSBridgeReady', onBridgeReady);
}
}else{
onBridgeReady();
}
}
</script>
</body>
</html>效果如下
原文地址：http://blog.csdn.net/fengshizty/article/details/45564685
