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：
引入js文件
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<script src="http://res.wx.qq.com/open/js/jweixin-1.0.0.js"></script>
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通过config接口注入权限验证配置
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$.ajax({
url: "${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
});
}
});
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微信jsapi验签
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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;
}
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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();
}
}
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controller层代码
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@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);
}
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前台jsp页面完整代码
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<%@ 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>
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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服务器之家。
原文链接：http://www.cnblogs.com/PreachChen/p/8659184.html