使用httppost实现post方法

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import org.apache.http.*;
import org.apache.http.client.HttpClient;
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;

import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.*;

public class DoPost {
 public static JSONObject dopost(Map<String, Object> params, String urlHz){
        // 发起请求
        String resp = null;
        try {
            resp = doPost(urlHz, JSON.toJSONString(params));
           // log.info("拉取信息：{}" + resp);
        } catch (Exception e) {
           // log.error("调用绿米接口失败", e);
        }
        return JSON.parseObject(resp);
    }
    private static String doPost(String url, String params) throws Exception {

        CloseableHttpClient httpclient = HttpClients.createDefault();
        HttpPost httpPost = new HttpPost(url);// 创建httpPost
        httpPost.setHeader("Accept", "application/json");
        httpPost.setHeader("Content-Type", "application/json");
        String charSet = "UTF-8";
        StringEntity entity = new StringEntity(params, charSet);
        httpPost.setEntity(entity);
        CloseableHttpResponse response = null;

        try {

            response = httpclient.execute(httpPost);
            StatusLine status = response.getStatusLine();
            int state = status.getStatusCode();
            System.out.println(state);
            if (state == HttpStatus.SC_OK) {
                HttpEntity responseEntity = response.getEntity();
                String jsonString = EntityUtils.toString(responseEntity);
                return jsonString;
            } else {
                //log.error("请求返回:" + state + "(" + url + ")");
                System.out.println("请求返回:" + state + "(" + url + ")");
            }
        } finally {
            if (response != null) {
                try {
                    response.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            try {
                httpclient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }
}

工具类如上所示;

例子:

String dingdanurl = "https://*?access_token="+"*";
        Map<String,Object> tempmap = new HashMap<String,Object>();
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        Calendar c = Calendar.getInstance();
        c.setTime(new Date());
        Date end = c.getTime();
        String dqrq= format.format(end)+" 00:00:00";//当前日期
        c.add(Calendar.DATE, -1);
        Date start = c.getTime();
        String qyt= format.format(start)+" 00:00:00";//前一天
        //  String qyt = "2020-08-08 00:00:00";
      //  tempmap.put("start_created",qyt);//前一天时间
      //  tempmap.put("end_created",dqrq);//当天时间
        tempmap.put("status","TRADE_SUCCESS");//订单状态 已签收
        JSONObject s = dopost(tempmap,dingdanurl);
        System.out.println(s.getJSONObject("data"));