利用微信JSSDK调用微信扫一扫功能

1. 确保有 调起微信扫一扫接口 权限，测试号可能不行；

2. 导入相关JS

3. 页面触发扫码元素

4. 相关JS代码

5. 获取签名接口getWechatSign.do各值生成方式

timestamp

Long timestamp = System.currentTimeMillis() / 1000;

nonceStr

String nonceStr = RandomStringUtils.randomAlphanumeric(16);

signature

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();
}

6. 微信参考文档

获取access_token  https://mp.weixin.qq.com/wiki?t=resource/res_main&id=mp1421140183
获取jsapi_ticket  https://mp.weixin.qq.com/wiki?t=resource/res_main&id=mp1421141115