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

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持呐喊教程。

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