获取微信用户OpenID

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一、获取code：

1、这里可以直接写在js里

​

location.href = 'https://open.weixin.qq.com/connect/oauth2/authorize?appid=替换APPID&redirect_uri=替换回调地址&response_type=code&scope=snsapi_base&state=STATE%23wechat_redirect&connect_redirect=1#wechat_redirect';

​

2、在回调地址中获取code

var code = $.getUrlParam("code");

二、获取openid：

​
// 创建HttpClientBuilder
HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();
// HttpClient
CloseableHttpClient closeableHttpClient = httpClientBuilder.build();
HttpGet httpGet = new HttpGet(urlOpenid + "?appid=替换APPID&secret=替换secret&code=替换code&grant_type=authorization_code");
try {
	HttpResponse httpResponse = closeableHttpClient.execute(httpGet);
	HttpEntity httpEntity = httpResponse.getEntity();
	if (httpEntity != null) {
		String result = EntityUtils.toString(httpEntity, "UTF-8");
		// 过滤
		result = result.replaceAll("", "");
		String sTotalString = result;
		// 把字符串转换为JSONArray对象
		JSONObject jsonObject = JSONObject.fromObject(sTotalString);
		if (jsonObject.get("openid") != null) {
			return jsonObject.get("openid").toString();
		}
	}
} catch (Exception e) {
	e.printStackTrace();
} finally {
	// 释放资源
	try {
		closeableHttpClient.close();
	} catch (IOException e) {
	}
}

​

说明：

1、getUrlParam自定义获取参数方法

2、将文中“替换”部分修改以外，其他部分可以不用修改