import lombok.extern.slf4j.Slf4j;
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.ResponseHandler;
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.entity.StringEntity;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import java.io.IOException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

@Slf4j
public class HttpUtils {

    private static final String ENCODING = "UTF-8";


    public static String post(String url, Map<String, String> paramsMap) {
        CloseableHttpClient client = HttpClients.createDefault();
        String responseText = "";
        CloseableHttpResponse response = null;
        try {
            HttpPost method = new HttpPost(url);
            if (paramsMap != null) {
                List<NameValuePair> paramList = new ArrayList<NameValuePair>();
                for (Map.Entry<String, String> param : paramsMap.entrySet()) {
                    NameValuePair pair = new BasicNameValuePair(param.getKey(), param.getValue());
                    paramList.add(pair);
                }
                method.setEntity(new UrlEncodedFormEntity(paramList, ENCODING));
            }
            response = client.execute(method);
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                responseText = EntityUtils.toString(entity);
            }
        } catch (Exception e) {
            log.error("http request failed",e);
        } finally {
            try {
                response.close();
            } catch (Exception e) {
                log.error("",e);
            }
        }
        return responseText;
    }

    public static String get(String url, Map<String, String> paramsMap) {
        CloseableHttpClient client = HttpClients.createDefault();
        String responseText = "";
        CloseableHttpResponse response = null;
        try {
            String getUrl = url+"?";
            if (paramsMap != null) {
                for (Map.Entry<String, String> param : paramsMap.entrySet()) {
                    getUrl += param.getKey() + "=" + URLEncoder.encode(param.getValue(), ENCODING)+"&";
                }
            }
            HttpGet method = new HttpGet(getUrl);
            response = client.execute(method);
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                responseText = EntityUtils.toString(entity);
            }
        } catch (Exception e) {
            log.error("http request failed",e);
        } finally {
            try {
                response.close();
            } catch (Exception e) {
                log.error("",e);
            }
        }
        return responseText;
    }
        //post請求引數為json格式
    public static String HttpPostWithJson(String url, String json) {
        String returnValue = "這是預設返回值，介面呼叫失敗";
        CloseableHttpClient httpClient = HttpClients.createDefault();
        ResponseHandler<String> responseHandler = new BasicResponseHandler();
        try{
            //第一步：建立HttpClient物件
            httpClient = HttpClients.createDefault();

            //第二步：建立httpPost物件
            HttpPost httpPost = new HttpPost(url);

            //第三步：給httpPost設定JSON格式的引數
            StringEntity requestEntity = new StringEntity(json,"utf-8");
            requestEntity.setContentEncoding("UTF-8");
            httpPost.setHeader("Content-type", "application/json");
            httpPost.setEntity(requestEntity);

            //第四步：傳送HttpPost請求，獲取返回值
            returnValue = httpClient.execute(httpPost,responseHandler); //調介面獲取返回值時，必須用此方法

        }
        catch(Exception e)
        {
            e.printStackTrace();
        }

        finally {
            try {
                httpClient.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        //第五步：處理返回值
        return returnValue;
    }


}
 

呼叫方式都很簡單前面兩個是url+map

map的key是引數，value是值。無參的話傳null就好了

post傳入json引數的話注意傳入的json要轉義。可以在postman上轉為json格式進行復制就好了

獲取到了json資料，如何json轉list並傳到資料庫的話可以看看我上一篇