Java实现的微信公众号获取微信用户信息示例

public class WeChatUserInfoTest {
  public static void main(String[] args) {
    String accessToken = "";//测试accessToken写死 真实环境不应该写死
    String openId = "";//测试openId写死 真实环境不应该写死
    Map<String, String> params = new HashMap<>();
    params.put("access_token", accessToken);
    params.put("openid", openId);
    params.put("lang", "zh_CN");
    String url = "https://api.weixin.qq.com/cgi-bin/user/info";
    String response = HttpClientUtil.doGet(url, params);
    JSONObject object = JSONObject.parseObject(response);
    /**
     * 移动应用、网站应用和公众帐号关联到同一个微信开放平台帐号时，unionid是唯一的，
     * 如果需要打通移动应用、网站应用和公众帐号或者以后要打通，很有必要存储unionId
     */
    String unionId = object.getString("unionid");
    /**
     * nickName很可能是一些古怪的符号，因此实际场景需要对nickName做处理，可以使用emoji-java的工具类去处理
     */
    String nickName = object.getString("nickname");
    String avatarUrl = object.getString("headimgurl");
  }
}

public class WeChatUserInfoTest {
  public static String getOpenId(String code, String appId, String appSecret) {
    Map<String, String> params = new HashMap<>();
    params.put("appid", appId);
    params.put("secret", appSecret);
    params.put("code", code);
    params.put("grant_type", "authorization_code");
    String url = "https://api.weixin.qq.com/sns/oauth2/access_token";
    String response = HttpClientUtil.doGet(url, params);
    JSONObject object = JSONObject.parseObject(response);
    String openId = object.getString("openid");
    return openId;
  }
  public static void main(String[] args) {
    String appId = "";//对应的appId
    String appSecret = "";//对应的appSecret
    String code = "";//前端获取到的用户code
    String openId = getOpenId(appId, appSecret, code);
    System.out.println(openId);
  }
}