一般httppost都是结合HttpClients使用
CloseableHttpResponse response = null;
CloseableHttpClient client = null;
HttpPost httpPost = new HttpPost(url); //需要请求的url
httpPost.setEntity(entityParams); //放入需要传的值
client = HttpClients.createDefault(); // new 个 client
response = client.execute(httpPost); //发送请求 并接收返回值
byte[] bytes = EntityUtils.toByteArray(response.getEntity()); //将返回值转为bytes 数组
// 后边就是根据情景对返回值进行具体的操作
