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[置顶] 微信公众号扫一扫

2018-03-27 18:32 134 查看

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:



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;
}

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%>">
<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">

</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,所有JS接口列表见附录2
});
}
});
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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