HttpClient的POST发送请求（参数为JSON）

    public String httpSendMsg(String content , String receiveTelsStr) throws IOException {

        String url = SmsGlobal.SEND_MSG_URL;
        CloseableHttpClient client = HttpClients.createDefault();
        HttpPost httpPost = new HttpPost(url);

        httpPost.setHeader("Content-Type", "application/json;charset=UTF-8");

        SendMsgParamsVo sendMsgParamsVo = new SendMsgParamsVo();
        sendMsgParamsVo.setFromName(SmsGlobal.SYSTEM_NAME);//设置系统名称
        sendMsgParamsVo.setOrgSecret(SmsGlobal.ORGSECRET);//3为内部手机用户
        sendMsgParamsVo.setPlatform(SmsGlobal.PLATFORM);//sms为发送短信方式

        sendMsgParamsVo.setContent(content);//设置短信内容
        sendMsgParamsVo.setUserid_list(receiveTelsStr);//设置接收短信的手机号  不同手机号之间用英文逗号隔开
        //jackson把bean变成json
        String sendMsgParamsVoStr = objectMapper.writeValueAsString(sendMsgParamsVo);
        StringEntity stringEntity = new StringEntity(sendMsgParamsVoStr,"UTF-8");
        httpPost.setEntity(stringEntity);

        CloseableHttpResponse response = client.execute(httpPost);
        HttpEntity entity = response.getEntity();

        String result = EntityUtils.toString(entity);
        return result;
    }

这里使用的是StringEntity构建的HttpEntity，放到请求体中。注意使用编码，防止乱码。

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