微信JSSDK调用微信扫一扫功能的方法

<script type="text/javascript" http://test.com/zepto_touch.js"></script> <script type="text/javascript" src="http://res.wx.qq.com/open/js/jweixin-1.0.0.js"></script> 

<img src="../../../images/right.jpg" onclick="scanCode()" class="img"> 

<script type="text/javascript">  var _appId = "wxz88dbd30e5580e59";  var _data = {   appId : _appId,   url : location.href,   t : Math.random()  };  var _getWechatSignUrl = 'http://test.com/getWechatSign.do';   // 获取微信签名  $.ajax({   url : _getWechatSignUrl,   data : _data,   success : function(o) {    console.log(o);    if (o.returnCode == "00") {     wxConfig(o.detail[0].timestamp, o.detail[0].nonceStr, o.detail[0].signature);    }   }  });  function wxConfig(_timestamp, _nonceStr, _signature) {   //alert('获取数据：'+_timestamp+'/n'+_nonceStr+'/n'+_signature);   console.log('获取数据：' + _timestamp + '/n' + _nonceStr + '/n' + _signature);   wx.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 : _appId, // 必填，公众号的唯一标识    timestamp : _timestamp, // 必填，生成签名的时间戳    nonceStr : _nonceStr, // 必填，生成签名的随机串    signature : _signature,// 必填，签名，见附录1    jsApiList : [ 'onMenuShareTimeline', 'onMenuShareAppMessage',      'onMenuShareQQ', 'onMenuShareWeibo', 'scanQRCode' ]   // 必填，需要使用的JS接口列表，所有JS接口列表见附录2   });  }  function scanCode() {   wx.scanQRCode({    needResult : 1,    scanType : [ "qrCode", "barCode" ],    success : function(res) {     console.log(res)     alert(JSON.stringify(res));     var result = res.resultStr;    },    fail : function(res) {     console.log(res)     alert(JSON.stringify(res));     }   });  } </script> 

Long timestamp = System.currentTimeMillis() / 1000; 

String nonceStr = RandomStringUtils.randomAlphanumeric(16); 

public static String getSign(String jsapi_ticket, String noncestr, Long timestamp, String url)   throws NoSuchAlgorithmException {  String shaStr = "jsapi_ticket=" + jsapi_ticket + "&noncestr=" + noncestr + "×tamp=" + timestamp + "&url="    + url;  MessageDigest mDigest = MessageDigest.getInstance("SHA1");  byte[] result = mDigest.digest(shaStr.getBytes());  StringBuffer signature = new StringBuffer();  for (int i = 0; i < result.length; i++) {   signature.append(Integer.toString((result[i] & 0xff) + 0x100, 16).substring(1));  }  return signature.toString(); }