如何设置HTTP Post实体，如Java的HttpPost.setEntity方法

import org.apache.http.HttpEntity;
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;

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

        // 创建HttpPost对象，并设置URL
        HttpPost httpPost = new HttpPost("http://example.com/api/endpoint");

        try {
            // 设置请求的实体内容
            StringEntity entity = new StringEntity("Hello, World!", "UTF-8");
            httpPost.setEntity(entity);

            // 发送请求并获取响应
            CloseableHttpResponse response = httpClient.execute(httpPost);

            // 处理响应...

            // 关闭HttpClient和响应
            response.close();
            httpClient.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}