java实现微信公众号扫一扫

2024-07-13 10:17:36

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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：

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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 +    "×tamp=" + 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" <div style="text-align: center; background-color: #f5f5f5; ">  <img src="../../../resources/images/borrow/scanReturn.png" </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。

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