java调用外部接口，并得到list集合

HttpClientUtil工具类

package com.haiqi.jmles.util;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;
import tk.mybatis.mapper.util.StringUtil;
import java.io.IOException;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;


public class HttpClientUtil {

    /**
     * 带参数get请求
     * @param url
     * @param param
     * @return
     */
    public static String doGet(String url, Map<String, String> param) {
        // 创建Httpclient对象
        CloseableHttpClient httpclient = HttpClients.createDefault();

        String resultString = "";
        CloseableHttpResponse response = null;
        try {
            // 创建uri
            URIBuilder builder = new URIBuilder(url);
            if (param != null) {
                for (String key : param.keySet()) {
                    builder.addParameter(key, param.get(key));
                }
            }
            URI uri = builder.build();
            // 创建http GET请求
            HttpGet httpGet = new HttpGet(uri);

            // 执行请求
            response = httpclient.execute(httpGet);
            // 判断返回状态是否为200
            if (response.getStatusLine().getStatusCode() == 200) {
                resultString = EntityUtils.toString(response.getEntity(), "UTF-8");
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (response != null) {
                    response.close();
                }
                httpclient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return resultString;
    }

    /**
     * 不带参数的get请求
     * @param url
     * @return String
     */
    public static String doGet(String url) {
        return doGet(url, null);
    }
    
    /**
     * 带参数的post请求
     * @param url
     * @param param
     * @return String
     */
    public static String doPost(String url, Map<String, String> param) {
        // 创建Httpclient对象
        CloseableHttpClient httpClient = HttpClients.createDefault();
        CloseableHttpResponse response = null;
        String resultString = "";
        try {
            // 创建Http Post请求
            HttpPost httpPost = new HttpPost(url);

            // 创建参数列表
            if (param != null) {
                List<NameValuePair> paramList = new ArrayList<>();
                for (String key : param.keySet()) {
                    paramList.add(new BasicNameValuePair(key, param.get(key)));
                }
                // 模拟表单 将参数设置为utf-8的形式
                UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList, HTTP.UTF_8);
                httpPost.setEntity(entity);
            }
            // 执行http请求
            response = httpClient.execute(httpPost);

            resultString = EntityUtils.toString(response.getEntity(), "utf-8");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                response.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return resultString;
    }

    /**
     * 不带参数的post请求
     * @param url
     * @return String
     */
    public static String doPost(String url) {
        return doPost(url, null);
    }
}

接口返回的json数据

 

调用外部接口，返回list集合

    public List<WFTraffic> test3() {
        Map<String, String> parms = new HashMap<>();
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");
        DateFormat df= new SimpleDateFormat("yyyy-MM-dd");
        //（1）获取当前时间
        LocalDateTime date = LocalDateTime.now();
        String nowtime=dateTimeFormatter.format(date);
        System.out.println("系统当前时间      ："+nowtime);
        //（2）获取当前时间的前12小时时间
        LocalDateTime localDateTime = date.minusHours(12);
        String nowtime12=dateTimeFormatter.format(localDateTime);
        System.out.println("获取当前时间的前12小时时间      ："+nowtime12);
        parms.put("starttime",nowtime12);
        parms.put("endtime",nowtime);
        //外部接口地址
        String url="http://36.154.210.106:8090/zxpybm/sts/openShareData/getWfTraffic2?starttime="+nowtime12+"&endtime="+nowtime;
        //调用HttpClientUtil.doGet工具类
        String result = HttpClientUtil.doGet(url);
        JSONObject person = JSON.parseObject(result);
        JSONArray at = person.getJSONArray("result");

        List<WFTraffic> wFTrafficList = new ArrayList<>();
        for (int i = 0; i < at.size(); i++) {
            JSONObject iEach = at.getJSONObject(i);
            WFTraffic wFTraffic= new WFTraffic();
            //获取json里的参数，set到wFTraffic里面
            wFTraffic.setShipNameCN((String) iEach.get("SHIP_NAME_CN"));
            wFTraffic.setAdPort((String) iEach.get("AD_PORT"));
            wFTraffic.setShipNameCN((String) iEach.get("SHIP_NAME_EN"));
            wFTraffic.setAdTime((String) iEach.get("AD_TIME"));
            wFTraffic.setDeclare_time((String) iEach.get("DECLARE_TIME"));
            wFTraffic.setNextPort((String) iEach.get("NEXT_PORT"));
            wFTraffic.setWorkTimeBegin((String) iEach.get("WORK_TIME_BEGIN"));
            wFTraffic.setAdBerth((String) iEach.get("AD_BERTH"));
            wFTraffic.setGoodsClass((String) iEach.get("GOODS_CLASS"));
            wFTraffic.setTotalWeight((String) iEach.get("TOTAL_WEIGHT"));
            wFTraffic.setVoyageNo((String) iEach.get("VOYAGE_NO"));
            wFTraffic.setGoodsNameEN((String) iEach.get("GOODS_NAME_EN"));
            wFTraffic.setGoodsNameCN((String) iEach.get("GOODS_NAME_CN"));
            wFTraffic.setPortFlag((String) iEach.get("PORT_FLAG"));
            wFTraffic.setWorkTimeEnd((String) iEach.get("WORK_TIME_END"));
            wFTraffic.setPrenPort((String) iEach.get("PREV_PORT"));
            wFTraffic.setGoodsDirection((String) iEach.get("GOODS_DIRECTION"));
            wFTrafficList.add(wFTraffic);
        }
        return wFTrafficList;
    }