微信支付H5调用支付详解（java版）

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 javaioIOException;
import javaioInputStream;
import javaioUnsupportedEncodingException;
import javautilDate;
import javautilHashMap;
import javautilIterator;
import javautilMap;
import javautilMapEntry;
import javautilRandom; 

import javaxservlethttpHttpServletRequest;
import javaxservlethttpHttpServletResponse; 

import orgapachecommonscodecdigestDigestUtils;
import orgspringframeworkstereotypeController;
import orgspringframeworkwebbindannotationRequestMapping;
import orgxmlpullvXmlPullParser;
import orgxmlpullvXmlPullParserException;
import orgxmlpullvXmlPullParserFactory; 

import comfasterxmljacksondatabindJsonNode;
import comgsonoauthOauth;
import comgsonoauthPay;
import comgsonutilHttpKit;
import comsyutilDatetimeUtil;
import comsyutilJsonUtil; 

@Controller
@RequestMapping("/pay")
public class WXPayController { 

  @RequestMapping(value = "wxprepaydo")
  public void jspay(HttpServletRequest request, HttpServletResponse response, String callback) throws Exception {
    // 获取openid
    String openId = SessionUtilgetAtt(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>();
    paraMapput("appid", appid);
    paraMapput("attach", "测试");
    paraMapput("body", "测试购买支付");
    paraMapput("mch_id", "10283271");
    paraMapput("nonce_str", create_nonce_str());
    paraMapput("openid", openId);
    paraMapput("out_trade_no", out_trade_no);
    paraMapput("spbill_create_ip", getAddrIp(request));
    paraMapput("total_fee", "1");
    paraMapput("trade_type", "JSAPI");
    paraMapput("notify_url", "http://wwwxxxco/bank/page/wxnotify");
    String sign = getSign(paraMap, paternerKey);
    paraMapput("sign", sign); 

    // 统一下单 https://apimchweixinqqcom/pay/unifiedorder
    String url = "https://apimchweixinqqcom/pay/unifiedorder"; 

    String xml = ArrayToXml(paraMap); 

    String xmlStr = HttpKitpost(url, xml); 

    // 预付商品id
    String prepay_id = ""; 

    if (xmlStrindexOf("SUCCESS") != -1) {
      Map<String, String> map = doXMLParse(xmlStr);
      prepay_id = (String) mapget("prepay_id");
    } 

    Map<String, String> payMap = new HashMap<String, String>();
    payMapput("appId", appid);
    payMapput("timeStamp", create_timestamp());
    payMapput("nonceStr", create_nonce_str());
    payMapput("signType", "MD5");
    payMapput("package", "prepay_id=" + prepay_id);
    String paySign = getSign(payMap, paternerKey); 

    payMapput("pg", prepay_id);
    payMapput("paySign", paySign); 

    WebUtilresponse(response, WebUtilpackJsonp(callback, JsonUtilwarpJsonNodeResponse(JsonUtilobjectToJsonNode(payMap))toString()));
  } 

  /**
   * map转成xml
   *
   * @param arr
   * @return
   */
  public String ArrayToXml(Map<String, String> arr) {
    String xml = "<xml>"; 

    Iterator<Entry<String, String>> iter = arrentrySet()iterator();
    while (iterhasNext()) {
      Entry<String, String> entry = iternext();
      String key = entrygetKey();
      String val = entrygetValue();
      xml += "<" + key + ">" + val + "</" + key + ">";
    } 

    xml += "</xml>";
    return xml;
  } 

  // 获取openId
  private String getUserOpenId(HttpServletRequest request) throws Exception {
    String code = requestgetParameter("code");
    if (code == null) {
      String openId = requestgetParameter("openId");
      return openId;
    }
    Oauth o = new Oauth();
    String token = ogetToken(code);
    JsonNode node = JsonUtilStringToJsonNode(token);
    String openId = nodeget("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 += charscharAt(rdnextInt(charslength() - 1));
      }
      return res;
  } 

  private String getAddrIp(HttpServletRequest request){
    return requestgetRemoteAddr();
  } 

  private String create_timestamp() {
    return LongtoString(SystemcurrentTimeMillis() / 1000);
  } 

  private String getTradeNo(){
    String timestamp = DatetimeUtilformatDate(new Date(), DatetimeUtilDATETIME_PATTERN);
    return "HZNO" + timestamp;
  } 

  private String getSign(Map<String, String> params, String paternerKey )
      throws UnsupportedEncodingException {
    String string1 = PaycreateSign(params, false);
    String stringSignTemp = string1 + "&key=" + paternerKey;
    String signValue = DigestUtilsmd5Hex(stringSignTemp)toUpperCase();
    return signValue;
  } 

  private Map<String, String> doXMLParse(String xml)
      throws XmlPullParserException, IOException { 

    InputStream inputStream = new ByteArrayInputStream(xmlgetBytes()); 

    Map<String, String> map = null; 

    XmlPullParser pullParser = XmlPullParserFactorynewInstance()
        newPullParser(); 

    pullParsersetInput(inputStream, "UTF-8"); // 为xml设置要解析的xml数据 

    int eventType = pullParsergetEventType(); 

    while (eventType != XmlPullParserEND_DOCUMENT) {
      switch (eventType) {
      case XmlPullParserSTART_DOCUMENT:
        map = new HashMap<String, String>();
        break; 

      case XmlPullParserSTART_TAG:
        String key = pullParsergetName();
        if (keyequals("xml"))
          break; 

        String value = pullParsernextText();
        mapput(key, value); 

        break; 

      case XmlPullParserEND_TAG:
        break; 

      } 

      eventType = pullParsernext(); 

    } 

    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://wwwspringframeworkorg/tags" %>
<%
  String path = requestgetContextPath();
  String basePath = requestgetScheme() + "://" + requestgetServerName() + ":" + requestgetServerPort() + path + "/";
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 01 Transitional//EN" "http://wwwworg/TR/html4/loosedtd">
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=0, maximum-scale=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/csscss?v=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/zeptominjs"></script>
  <script type="text/javascript" src="/js/commonjs"></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(){ 

      WeixinJSBridgeinvoke(
        '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(reserr_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：reserr_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( documentaddEventListener ){
          documentaddEventListener('WeixinJSBridgeReady', onBridgeReady, false);
        }else if (documentattachEvent){
          documentattachEvent('WeixinJSBridgeReady', onBridgeReady);
          documentattachEvent('onWeixinJSBridgeReady', onBridgeReady);
        }
      }else{
        onBridgeReady();
      }  

    }
  </script>
</body>
</html>

效果如下

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