String url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=wx705762491229630b&secret=f984414914131383e75cd5741371618f&code=" + code + "&grant_type=authorization_code";
//org.springframework.web.client RestTemplate
RestTemplate restTemplate = new RestTemplate();
String response = restTemplate.getForObject(url, String.class);
log.info("response={}", response);
JSONObject object = JSONObject.parseObject(response);
String openid = object.getString("openid");
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