pom文件：

        <!-- https://mvnrepository.com/artifact/commons-httpclient/commons-httpclient -->
        <dependency>
            <groupId>commons-httpclient</groupId>
            <artifactId>commons-httpclient</artifactId>
            <version>3.1</version>
        </dependency>

        <!-- 阿里的json工具包 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.68</version>
        </dependency>

工具类：

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
import org.apache.http.HttpException;

import java.io.IOException;

/**
 * @ClassName HttpClientUtil
 * @Description TOD0
 * author axx
 * Date 2021/12/28 15:53
 * Version 1.0
 **/
public class HttpClientUtil {
    public static String sendPost(String urlParam) throws HttpException, IOException {
        // 创建httpClient实例对象
        HttpClient httpClient = new HttpClient();
        // 设置httpClient连接主机服务器超时时间：15000毫秒
        httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(15000);
        // 创建post请求方法实例对象
        PostMethod postMethod = new PostMethod(urlParam);
        // 设置post请求超时时间
        postMethod.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, 60000);
        postMethod.addRequestHeader("Content-Type", "application/json");

        httpClient.executeMethod(postMethod);

        String result = postMethod.getResponseBodyAsString();
        postMethod.releaseConnection();
        return result;
    }

    public static JSONArray sendGet(String urlParam) throws IOException {
        // 创建httpClient实例对象
        HttpClient httpClient = new HttpClient();
        // 设置httpClient连接主机服务器超时时间：15000毫秒
        httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(15000);
        // 创建GET请求方法实例对象
        GetMethod getMethod = new GetMethod(urlParam);
        // 设置post请求超时时间
        getMethod.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, 60000);
        getMethod.addRequestHeader("Content-Type", "application/json");
        httpClient.executeMethod(getMethod);
        String result = getMethod.getResponseBodyAsString();
        getMethod.releaseConnection();
        JSONObject resultJson = JSONObject.parseObject(result);//转换成JSON格式
        Integer status = (Integer) resultJson.get("code");//获取返回数据状态，get获取的字段需要根据提供的返回值去获取（根据实际情况修改）
        if (status == 200) {//返回的状态
            JSONArray data = JSONObject.parseArray(resultJson.get("data").toString());//"records"是根据返回值设定
            return data; //返回的数据就是我需要去解析的（根据实际情况修改）
        }
        return null;
    }
}