java实现微信公众号扫一扫

本文实例为大家分享了微信公众号扫一扫的具体代码，供大家参考，具体内容如下

步骤

根据微信JS-JDK文档说明，实现扫一扫主要有以下几大步骤：

绑定域名
引入JS文件
通过config接口注入权限验证配置
通过ready接口处理成功验证
通过error接口处理失败验证

绑定域名

在JS接口安全域名填入域名，注意不带http，如图：

java实现微信公众号扫一扫

引入JS文件

<script src="http://res.wx.qq.com/open/js/jweixin-1.0.0.js"></script>

通过config接口注入权限验证配置

$.ajax({
  url: "${pageContext.request.contextPath}/wechat/jsapisign",
  type: "post",
  data: {
   url: location.href.split('#')[0]
  },
  contentType: 'application/x-www-form-urlencoded;charset=utf-8',
  async: true,
  success: function (data) {
   wx.config({
    debug: false,
    appId: data.appid, // 必填，公众号的唯一标识
    timestamp: data.timestamp, // 必填，生成签名的时间戳
    nonceStr: data.nonceStr, // 必填，生成签名的随机串
    signature: data.signature,// 必填，签名，见附录1
    jsApiList: ["scanQRCode"] // 必填，需要使用的JS接口列表，所有JS接口列表见附录2
   });
  }
 });

微信jsapi验签

public Map<String, String> jsApiSign(String url) {
  Map<String, String> ret = new HashMap<String, String>(16);
  String nonce_str = CheckUtil.create_nonce_str();
  String timestamp = CheckUtil.create_timestamp();
  String string1;
  String signature = "";

  String jsapi_ticket = wechatAccessTokenService.getJsApiTicket();
  //注意这里参数名必须全部小写，且必须有序
  string1 = "jsapi_ticket=" + jsapi_ticket +
    "&noncestr=" + nonce_str +
    "&timestamp=" + timestamp +
    "&url=" + url;
  logger.info("jsApiSign===" + string1);

  try {
   MessageDigest crypt = MessageDigest.getInstance("SHA-1");
   crypt.reset();
   crypt.update(string1.getBytes("UTF-8"));
   signature = CheckUtil.byteToHex(crypt.digest());
  } catch (NoSuchAlgorithmException | UnsupportedEncodingException e) {
   e.printStackTrace();
  }

  ret.put("appid", appid);
  ret.put("url", url);
  ret.put("jsapi_ticket", jsapi_ticket);
  ret.put("nonceStr", nonce_str);
  ret.put("timestamp", timestamp);
  ret.put("signature", signature);
  logger.info("jsApiSign===url=" + url + "==jsapi_ticket" + jsapi_ticket + "==nonce_str" + nonce_str + "==timestamp" + timestamp + "==signature" + signature);
  return ret;
 }

public String getJsApiTicket() {
  AugeWechatAccessToken wechatAccesstoken = augeWechatAccessTokenMapper.selectByPrimaryKey(jsApiTicketId);
  logger.info("getJsApiTicket===" + wechatAccesstoken.getAccessToken());
  if (Strings.isNullOrEmpty(wechatAccesstoken.getAccessToken()) || wechatAccesstoken.getExpiresIn() - 100 * 1000 < System.currentTimeMillis()) {
   //空或者过期，刷新
   return refreshJsApiTicket();
  } else {
   return wechatAccesstoken.getAccessToken();
  }
 }

Controller层代码

@RequestMapping(value = "/jsapisign", method = {RequestMethod.GET, RequestMethod.POST}, produces = MEDIATYPE_CHARSET_JSON_UTF8)
 @ResponseBody
 public String jsApiSign(String url) {
  //添加微信js签名信息
  Map<String, String> signMap = wechatService.jsApiSign(url);

  return JSON.toJSONString(signMap);
 }

前台JSP页面完整代码

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
 String path = request.getContextPath();
 String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html lang="zh-CN">
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=320.1,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no">
<head>
 <base href="<%=basePath%>" rel="external nofollow" >
 <title>扫码还书</title>
 <link rel="stylesheet" href="http://203.195.235.76/jssdk/css/style.css"/>
 <script src="http://res.wx.qq.com/open/js/jweixin-1.1.0.js"></script>
 <script src="http://libs.baidu.com/jquery/2.0.0/jquery.js"></script>
 <link rel="stylesheet" type="text/css" href="../../../resources/css/bookdetail.css" rel="external nofollow" >

</head>

<body>
<div class="wrap" style="width: 100% ;height: 100%">
 <img src="../../../resources/images/borrow/return.png" alt="" style="width: 100% ;height: 75%">
 <div style="text-align: center; background-color: #f5f5f5; ">
  <img src="../../../resources/images/borrow/scanReturn.png" alt="" style="width: 40% ;height: 25%;" id="scanQRCode1">
 </div>

</div>

<script type="text/javascript">
 $.ajax({
  url: "${pageContext.request.contextPath}/wechat/jsapisign",
  type: "post",
  data: {
   url: location.href.split('#')[0]
  },
  contentType: 'application/x-www-form-urlencoded;charset=utf-8',
  async: true,
  success: function (data) {
   wx.config({
    debug: false,
    appId: data.appid, // 必填，公众号的唯一标识
    timestamp: data.timestamp, // 必填，生成签名的时间戳
    nonceStr: data.nonceStr, // 必填，生成签名的随机串
    signature: data.signature,// 必填，签名，见附录1
    jsApiList: ["scanQRCode"] // 必填，需要使用的JS接口列表
   });
  }
 });
 wx.ready(function () {
  // 9.1.2 扫描二维码并返回结果
  document.querySelector('#scanQRCode1').onclick = function () {
   wx.scanQRCode({
    needResult: 1,
    desc: 'scanQRCode desc',
    success: function (res) {
     //扫码后获取结果参数赋值给Input
     var url = res.resultStr;
     //商品条形码，取","后面的
     if (url.indexOf(",") >= 0) {
      var tempArray = url.split(',');
      var barCode = tempArray[1];
      window.location.href = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=wx96668744efc2b2de&redirect_uri=http://cx.ngrok.xiaomiqiu.cn/wechat/toReturnDetail?barCode=" + barCode + "&response_type=code&scope=snsapi_base&state=BINDFACE#wechat_redirect";

     } else {
      alert("请对准条形码扫码!");
     }
    }
   });
  };
 });
 //初始化jsapi接口 状态
 wx.error(function (res) {
  alert("调用微信jsapi返回的状态:" + res.errMsg);
 });

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

注：开发中容易出现的有signature验签错误，我们可以透过前后端url一致性来判断。其次就是注意有时候的错误是由于accessToken没有刷新的缘故，需要重新刷新。

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。

java实现微信公众号扫一扫

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