POM

  1. <!-- Apache Http Begin -->
  2. <dependency>
  3.     <groupId>org.apache.httpcomponents</groupId>
  4.     <artifactId>httpclient</artifactId>
  5.     <version>4.5.5</version>
  6. </dependency>
  7. <dependency>
  8.     <groupId>org.apache.httpcomponents</groupId>
  9.     <artifactId>fluent-hc</artifactId>
  10.     <version>4.5.5</version>
  11. </dependency>
  12. <dependency>
  13.     <groupId>org.apache.httpcomponents</groupId>
  14.     <artifactId>httpmime</artifactId>
  15.     <version>4.5.5</version>
  16. </dependency>
  17. <!-- Apache Http End -->

工具类

  1. package cn.hzlim.hello.httpclient;
  3. import org.apache.http.HttpEntity;
  4. import org.apache.http.client.entity.UrlEncodedFormEntity;
  5. import org.apache.http.client.methods.CloseableHttpResponse;
  6. import org.apache.http.client.methods.HttpGet;
  7. import org.apache.http.client.methods.HttpPost;
  8. import org.apache.http.impl.client.CloseableHttpClient;
  9. import org.apache.http.impl.client.HttpClients;
  10. import org.apache.http.message.BasicNameValuePair;
  11. import org.apache.http.util.EntityUtils;
  13. import java.io.IOException;
  14. import java.util.Arrays;
  16. /**
  17.  * 
  18.  * HttpClient工具类
  19.  * @title: HttpClientUtils
  20.  * @description: 
  21.  * 
  22.  * @author: xianyu_tf
  23.  * @date: 2019-07-12 22:53
  24.  * @version 1.0.0
  25.  *
  26.  */
  27. public class HttpClientUtils {
  29.     public static final String GET="get";
  30.     public static final String POST="post";
  32.     public static final String REQUEST_HEADER_CONNECTION="keep-alive";
  33.     public static final String REQUEST_HEADER_USER_AGENT="Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36";
  35.     /**
  36.      * get请求
  37.      * @param url 请求地址
  38.      * @return
  39.      */
  40.     public static String doGet(String url){
  41.         return createRequest(url,GET,null);
  42.     }
  44.     /**
  45.      * get请求
  46.      * @param url 请求地址
  47.      * @param cookie cookie
  48.      * @return
  49.      */
  50.     public static String doGet(String url,String cookie){
  51.         return createRequest(url,GET,cookie);
  52.     }
  54.     /**
  55.      * post请求
  56.      * @param url 请求地址
  57.      * @param params 请求参数
  58.      * @return
  59.      */
  60.     public static String doPost(String url,BasicNameValuePair... params){
  61.         return createRequest(url,POST,null,params);
  62.     }
  64.     /**
  65.      * post请求
  66.      * @param url 请求地址
  67.      * @param cookie cookie
  68.      * @param params 请求参数
  69.      * @return
  70.      */
  71.     public static String doPost(String url,String cookie,BasicNameValuePair... params){
  72.         return createRequest(url,POST,cookie,params);
  73.     }
  76.     /**
  77.      *  创建请求
  78.      * @param url 请求地址
  79.      * @param requestMethod 请求方式get/post
  80.      * @param cookie cookie
  81.      * @param params 请求参数 仅限于post
  82.      * @return
  83.      */
  84.     private static String createRequest(String url,String requestMethod,String cookie,BasicNameValuePair... params){
  85.         CloseableHttpClient httpClient = HttpClients.createDefault();
  87.         String result = null;
  89.         //请求方式
  90.         HttpPost httpPost = null;
  91.         HttpGet httpGet = null;
  93.         //响应
  94.         CloseableHttpResponse httpResponse = null;
  96.         try {
  97.             if (GET.equals(requestMethod)){
  98.                 httpGet = new HttpGet(url);
  99.                 httpGet.setHeader("Connection", REQUEST_HEADER_CONNECTION);
  100.                 httpGet.setHeader("Cookie", cookie);
  101.                 httpGet.setHeader("User-Agent",  REQUEST_HEADER_USER_AGENT);
  103.                 httpResponse = httpClient.execute(httpGet);
  105.             }else if(POST.equals(requestMethod)){
  106.                 httpPost = new HttpPost(url);
  107.                 httpPost.setHeader("Connection", REQUEST_HEADER_CONNECTION);
  108.                 httpPost.setHeader("Cookie", cookie);
  109.                 httpPost.setHeader("User-Agent",  REQUEST_HEADER_USER_AGENT);
  111.                 //判断是否有参数
  112.                 if(params != null && params.length > 0){
  113.                     httpPost.setEntity(new UrlEncodedFormEntity(Arrays.asList(params), "UTF-8"));
  114.                 }
  116.                 httpResponse = httpClient.execute(httpPost);
  118.             }
  120.             HttpEntity httpEntity = httpResponse.getEntity();
  121.             result = EntityUtils.toString(httpEntity);
  123.         }catch (IOException e){
  124.             e.printStackTrace();
  125.         }finally {
  126.             //关闭连接
  127.             if (httpResponse != null) {
  128.                 try {
  129.                     httpResponse.close();
  130.                 } catch (IOException e) {
  131.                     e.printStackTrace();
  132.                 }
  133.             }
  135.             if (httpClient != null) {
  136.                 try {
  137.                     httpClient.close();
  138.                 } catch (IOException e) {
  139.                     e.printStackTrace();
  140.                 }
  141.             }
  142.         }
  143.         return result;
  144.     }
  145. }