Java学习之HttpClient的GET与POST请求

Posted 2020-10-25 乌鸦也能展翅高飞

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

<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.3</version>
</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<String,String> 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<NameValuePair> postData = new ArrayList<NameValuePair>();
47                 for (Map.Entry<String,String> 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 }