实例详解httpclient发送post请求

在使用HttpClient发送POST请求时，需要注意以下几点：

1.创建HttpClient对象

2.创建HttpPost对象，设置请求URL和请求体

3.设置请求头信息

4.执行请求，获取响应结果

下面是一个示例代码：

import java.io.IOException;
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

public class HttpClientPostExample {

   public static void main(String[] args) {
       //创建HttpClient对象
       CloseableHttpClient httpClient = HttpClients.createDefault();

       //创建HttpPost对象
       HttpPost httpPost = new HttpPost("http://www.example.com/api");

       //设置请求体
       StringEntity entity = new StringEntity("{\"name\":\"John\", \"age\":30}", "UTF-8"