解决RestTemplate无法推送带有Emoji表情消息

需要导入HttpClient依赖

<dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.9</version>
</dependency>

用以下代码替换原来RestTemplate请求的代码（以发送客服消息为例）：

String url = "https://api.weixin.qq.com/cgi-bin/message/custom/send?access_token=ACCESS_TOKEN"；
HttpPost httpPost =new HttpPost(url);
StringEntity entity =new StringEntity(json, Consts.UTF_8);
httpPost.setEntity(entity);
HttpClientBuilder builder = HttpClientBuilder.create();
CloseableHttpClient httpClient = builder.build();
CloseableHttpResponse httpResponse = httpClient.execute(httpPost);
String responseJson = EntityUtils.toString(httpResponse.getEntity(), Consts.UTF_8);

大功告成！