HttpUtils

package com.hj.jd.basic.utils.web;import org.apache.http.HttpStatus;import org.apache.http.NameValuePair;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.HttpClient;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.util.EntityUtils;import java.io.IOException;import java.io.UnsupportedEncodingException;import java.net.URI;import java.net.URISyntaxException;import java.util.ArrayList;import java.util.List;import java.util.Map;public class HttpClientUtils {   public static String doGet(String url) {      return doGet(url, null, null);   }   public static String doGet(String url, Map<String, String> params) {      return doGet(url, params, null);   }   public static String doGet(String url, Map<String, String> params, Map<String, String> headers) {      //1.建立http客戶端對象      CloseableHttpClient httpClient = HttpClients.createDefault();      CloseableHttpResponse response = null;      String result = "";      try {         //2.構建一個URI對象,根據url及參數         URIBuilder uriBuilder = new URIBuilder(url);         //2.1請求參數         if (params != null && params.size() > 0) {            for (String key : params.keySet()) {               uriBuilder.addParameter(key, params.get(key));            }         }         URI uri = uriBuilder.build();         //3.建立一個get請求         HttpGet httpGet = new HttpGet(uri);         //3.1請求頭         if (headers != null && headers.size() > 0) {            for (String key : headers.keySet()) {               httpGet.addHeader(key, headers.get(key));            }         }         //4.執行get請求,獲得響應         response = httpClient.execute(httpGet);         if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {            //5.從響應對象中獲取響應數據            result = EntityUtils.toString(response.getEntity(), "UTF-8");         }      } catch (URISyntaxException e) {         e.printStackTrace();      } catch (ClientProtocolException e) {         e.printStackTrace();      } catch (IOException e) {         e.printStackTrace();      } finally {         org.apache.http.client.utils.HttpClientUtils.closeQuietly(response);         org.apache.http.client.utils.HttpClientUtils.closeQuietly(httpClient);      }      return result;   }   public static String doPost(String url) {      return doPost(url, null);   }   public static String doPost(String url, Map<String, String> params) {      String result = "";      CloseableHttpClient httpClient = HttpClients.createDefault();      HttpPost httpPost = new HttpPost(url);      //封裝post請求參數      int size = params.size();      if (params != null && size > 0) {         List<NameValuePair> pairList = new ArrayList<>(size);         for (String key : params.keySet()) {            pairList.add(new BasicNameValuePair(key, params.get(key)));         }         try {            UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(pairList);            httpPost.setEntity(formEntity);            //執行post請求            CloseableHttpResponse response = null;            try {               response = httpClient.execute(httpPost);               result = EntityUtils.toString(response.getEntity(), "UTF-8");            } catch (IOException e) {               e.printStackTrace();            } finally {               org.apache.http.client.utils.HttpClientUtils.closeQuietly(response);            }         } catch (UnsupportedEncodingException e) {            e.printStackTrace();         }      }      org.apache.http.client.utils.HttpClientUtils.closeQuietly(httpClient);      return result;   }   public static String doPostWithJson(String url, String jsonParams) {      String result = "";      CloseableHttpClient httpClient = HttpClients.createDefault();      HttpPost httpPost = new HttpPost(url);      StringEntity entity = new StringEntity(jsonParams, ContentType.APPLICATION_JSON);      httpPost.setEntity(entity);      CloseableHttpResponse response = null;      try {         response = httpClient.execute(httpPost);         result = EntityUtils.toString(response.getEntity(), "UTF-8");      } catch (IOException e) {         e.printStackTrace();      } finally {         org.apache.http.client.utils.HttpClientUtils.closeQuietly(response);      }      org.apache.http.client.utils.HttpClientUtils.closeQuietly(httpClient);      return result;   }   public static void main(String[] args) {      String result = doGet("https://www.baidu.com", null, null);      System.err.println(result);   }}