Java学习之HttpClient的GET与POST请求-白红宇

Java学习之HttpClient的GET与POST请求

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发布时间：2019-06-22

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这篇随笔记录了HttpClient的GET和POST请求

使用maven构建依赖包，我使用的版本是4.5.3

<groupId>org.apache.httpcomponents</groupId>

<artifactId>httpclient</artifactId>

</dependency>　

代码如下：

1 import org.apache.http.HttpEntity; 2 import org.apache.http.HttpResponse; 3 import org.apache.http.NameValuePair; 4 import org.apache.http.client.entity.UrlEncodedFormEntity; 5 import org.apache.http.client.methods.HttpGet; 6 import org.apache.http.client.methods.HttpPost; 7 import org.apache.http.impl.client.CloseableHttpClient; 8 import org.apache.http.impl.client.HttpClients; 9 import org.apache.http.message.BasicNameValuePair;10 import org.apache.http.protocol.HTTP;11 import org.apache.http.util.EntityUtils;12 13 import java.util.ArrayList;14 import java.util.List;15 import java.util.Map;16 17 public class HttpRequest {18     private static final String USER_AGENT = "Mozilla/5.0";19     private static final String TOKEN = "Bearer adad2342dfbcdcb44232bf6a";20     private static final String CONTENT_TYPE = "application/x-www-form-urlencoded";        //发送GET请求21     public static String sendGet(String url){22         String result = "";23         CloseableHttpClient httpClient = HttpClients.createDefault();24         HttpGet httpGet = new HttpGet(url);25         httpGet.addHeader("User-Agent", USER_AGENT);26         httpGet.addHeader("Authorization", TOKEN);27         try{28             HttpResponse response = httpClient.execute(httpGet);29             HttpEntity entity = response.getEntity();30             result = EntityUtils.toString(entity);31         }catch (Exception e){32             e.printStackTrace();33         }34         return result;35     }36     //发送POST请求37     public static String sendPost(String url,Map
     
       mapParam){38         String result = "";39         CloseableHttpClient httpClient = HttpClients.createDefault();40         HttpPost httpPost = new HttpPost(url);41         httpPost.setHeader("Content-Type",CONTENT_TYPE);42         httpPost.addHeader("User-Agent" ,USER_AGENT);43         httpPost.addHeader("Authorization", TOKEN);44         try{45             if (mapParam != null){46                 List
      
        postData = new ArrayList
       
        ();47                 for (Map.Entry
        
          entry : mapParam.entrySet()){48                     postData.add(new BasicNameValuePair(entry.getKey(),entry.getValue()));49                 }50                 httpPost.setEntity(new UrlEncodedFormEntity(postData, HTTP.UTF_8));51             }52             HttpResponse response = httpClient.execute(httpPost);53             HttpEntity entity = response.getEntity();54             result = EntityUtils.toString(entity);55         }catch (Exception e){56             e.printStackTrace();57         }58         return result;59     }60 }