大概流程：1.根据appId和appSecret获取access_token(使用凭证)进入微信公众平台扫码登录测试号公众号：https://mp.weixin.qq.com/debug/cgi-bin/sandbox?tsandbox/loginpublicstaticJSONObjectgetTokenTool(StringappId,StringappSecret){Stringurl"https://api.weixin.qq.com/cgi-bin/token?grant_typeclient_credentialappid"+appId+"secret"+appSecret;System.out.println(HttpRequestUtil.httpRequest(url,"GET",""));returnHttpRequestUtil.httpRequest(url,"GET","");}这是测试号获取access_token的接口，普通公众号接口地址请查看微信官方文档。2.根据access_token获取jsapi_ticketpublicstaticJSONObjectgetTicketTool(Stringaccess_token){Stringurl"https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token"+access_token+"typejsapi";System.out.println(HttpRequestUtil.httpRequest(url,"GET",""));returnHttpRequestUtil.httpRequest(url,"GET","");}3.在微信获取签名算法（具体如下）publicstaticMapString,Stringsign(Stringurl){StringappId"wxcc42f613dbf7299f";StringappSecret"e59e10c74c70b1c042b5ecaf454052ac";Stringaccess_tokengetTokenTool(appId,appSecret).getString("access_token");JSONObjectticketJsongetTicketTool(access_token);System.out.println(ticketJson.toString());Stringjsapi_ticketticketJson.getString("ticket");MapString,StringretnewHashMapString,String();//这里的jsapi_ticket是获取的jsapi_ticket。Stringnonce_strcreate_nonce_str();Stringtimestampcreate_timestamp();Stringstring1;Stringsignature"";System.out.println(2);//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;try{MessageDigestcryptMessageDigest.getInstance("SHA-1");crypt.reset();crypt.update(string1.getBytes("UTF-8"));signaturebyteToHex(crypt.digest());System.out.println("crypt"+crypt.toString());System.out.println("string1"+string1);System.out.println("signature"+signature);}catch(NoSuchAlgorithmExceptione){e.printStackTrace();}catch(UnsupportedEncodingExceptione){e.printStackTrace();}ret.put("url",url);ret.put("jsapi_ticket",jsapi_ticket);ret.put("nonceStr",nonce_str);ret.put("timestamp",timestamp);ret.put("signature",signature);returnret;}privatestaticStringbyteToHex(finalbyte[]hash){FormatterformatternewFormatter();for(byteb:hash){formatter.format("%02x",b);}Stringresultformatter.toString();formatter.close();returnresult;}privatestaticStringcreate_nonce_str(){returnUUID.randomUUID().toString();}privatestaticStringcreate_timestamp(){returnLong.toString(System.currentTimeMillis()/1000);}4.获取一个js安全域名接口（如：gstz.imwork.net）一般使用花生壳进行内网穿透，使内网地址映射到一个花生壳提供的公网的地址，适合用来测试，花生壳内网穿透如何使用可到花生壳官网查看。5.把域名和action的地址拼接起来成url，放入签名方法中(如签名算法的action：https://gstz.imwork.net:8080/Weixin/weixin/getSign.do)@Controller@SuppressWarnings("serial")publicclassWeixinAction{/***获取签名算法*/@RequestMapping("getSign")@ResponseBodypublicJSONObjectgetSign(){JSONObjectjsonObjectnewJSONObject();Stringurl"http://17j62137x0.imwork.net/ssm_d1/index.jsp";MapString,StringretWxJSUtil.sign(url);System.out.println("map"+ret.toString());jsonObject.put("weixin",ret);System.out.println("json"+jsonObject.toString());returnjsonObject;}}6.在JSP页面初始化时异步获取签名action传来3个参数，JSP内容如下%@pagelanguage"java"contentType"text/html;charsetUTF-8"pageEncoding"UTF-8"%!DOCTYPEhtmlheadmetahttp-equiv"Content-Type"content"text/html;charsetUTF-8"title微信扫一扫/titlescriptsrc"http://res.wx.qq.com/open/js/jweixin-1.0.0.js"/scriptscripttype"text/javascript"src"js/jquery-3.2.1.min.js"/scriptscripttype"text/javascript"src"js/weixin.js"/script/headbodyinputid"timestamp"type"hidden"value"${timestamp}"/inputid"noncestr"type"hidden"value"${nonceStr}"/inputid"signature"type"hidden"value"${signature}"/inputid"id_securityCode_input"buttonid"scanQRCode"οnclick"getWeixinResult()"扫码/button/bodyscripttype"text/javascript"/script/html7.通过签名算法获取wx.config的4个重要参数：jsapi_ticket、noncestr、timestamp、urlwx.config({debug:true,//开启调试模式,调用的所有api的返回值会在客户端alert出来，若要查看传入的参数，可以在pc端打开，参数信息会通过log打出，仅在pc端时才会打印。appId:'',//必填，公众号的唯一标识timestamp:,//必填，生成签名的时间戳nonceStr:'',//必填，生成签名的随机串signature:'',//必填，签名，见附录1jsApiList:[]//必填，需要使用的JS接口列表，所有JS接口列表见附录2});8.告诉微信选择调用的接口名称9.把获取的结果result进行处理getWeixinResultCallBack(param)10.给按钮添加getWeixinResult事件，就可以通过按钮调用扫一扫功能。（记得用微信浏览器点开）这是DEMO的下载地址（博主本想免费分享这个资源的，无奈CSDN最少也要2点资源分才能下载）：下载DEMO