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@Autowired
private CloseableHttpClient httpClient;

@Autowired
private RequestConfig config;
public String doPost(String url) throws Exception{
    //声明http请求
    HttpPost httpPost = new HttpPost(url);
    //装载配置信息
    httpPost.setConfig(config);
    //发起请求
    CloseableHttpResponse response = this.httpClient.execute(httpPost);
    //判断状态码是否为200
    if(response.getStatusLine().getStatusCode() == 200){
        //返回响应体内容
        return EntityUtils.toString(response.getEntity(),"UTF-8");
    }
    return null;
}