HttpClient4.X发送带参数的Get请求

绝地灬酷狼 2022-06-06 04:37 189阅读 0赞

HttpClient 是apache 组织下面的一个用于处理HTTP 请求和响应的开源工具。所用jar包为httpclient-4.3.6.jar、httpcore-4.3.3.jar、httpmime-4.3.6.jar、commons-codec-1.6.jar。

发送Get请求代码如下：

**\[java\]**  view plain  copy

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1.  package com.zkn.newlearn.httpclient;  
2.    
3.  import java.io.BufferedReader;  
4.  import java.io.IOException;  
5.  import java.io.InputStream;  
6.  import java.io.InputStreamReader;  
7.  import java.util.List;  
8.    
9.  import org.apache.http.Consts;  
10. import org.apache.http.HttpEntity;  
11. import org.apache.http.NameValuePair;  
12. import org.apache.http.ParseException;  
13. import org.apache.http.client.entity.UrlEncodedFormEntity;  
14. import org.apache.http.client.methods.CloseableHttpResponse;  
15. import org.apache.http.client.methods.HttpGet;  
16. import org.apache.http.impl.client.CloseableHttpClient;  
17. import org.apache.http.impl.client.HttpClients;  
18. import org.apache.http.message.BasicNameValuePair;  
19. import org.apache.http.util.EntityUtils;  
20.   
21. import com.google.common.collect.Lists;  
22.   
23. public class HttpClientTest02 \{  
24.   
25.     public static void main(String\[\] args) \{  
26.         CloseableHttpClient httpClient = HttpClients.createDefault();  
27.         CloseableHttpResponse response = null;  
28.         InputStream is = null;  
29.         String url = "http://localhost:8080/MyWebxTest/getCityByProvinceEname.do";  
30.         //封装请求参数  
31.         List<NameValuePair> params = Lists.newArrayList();  
32.         params.add(new BasicNameValuePair("cityEname", "henan"));  
33.         String str = "";  
34.         try \{  
35.             //转换为键值对  
36.             str = EntityUtils.toString(new UrlEncodedFormEntity(params, Consts.UTF\_8));  
37.             System.out.println(str);  
38.             //创建Get请求  
39.             HttpGet httpGet = new HttpGet(url+"?"\+str);  
40.             //执行Get请求，  
41.             response = httpClient.execute(httpGet);  
42.             //得到响应体  
43.             HttpEntity entity = response.getEntity();  
44.             if(entity != null)\{  
45.                 is = entity.getContent();  
46.                 //转换为字节输入流  
47.                 BufferedReader br = new BufferedReader(new InputStreamReader(is, Consts.UTF\_8));  
48.                 String body = null;  
49.                 while((body=br.readLine()) != null)\{  
50.                     System.out.println(body);  
51.                 \}  
52.             \}  
53.         \} catch (ParseException e) \{  
54.             e.printStackTrace();  
55.         \} catch (IOException e) \{  
56.             e.printStackTrace();  
57.         \} finally\{  
58.             //关闭输入流，释放资源  
59.             if(is != null)\{  
60.                 try \{  
61.                     is.close();  
62.                 \} catch (IOException e) \{  
63.                     e.printStackTrace();  
64.                 \}  
65.             \}  
66.             //消耗实体内容  
67.             if(response != null)\{  
68.                 try \{  
69.                     response.close();  
70.                 \} catch (IOException e) \{  
71.                     e.printStackTrace();  
72.                 \}  
73.             \}  
74.             //关闭相应 丢弃http连接  
75.             if(httpClient != null)\{  
76.                 try \{  
77.                     httpClient.close();  
78.                 \} catch (IOException e) \{  
79.                     e.printStackTrace();  
80.                 \}  
81.             \}  
82.         \}  
83.           
84.     \}  
85. \}

package com.zkn.newlearn.httpclient;
    
    import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.InputStreamReader;
    import java.util.List;
    
    import org.apache.http.Consts;
    import org.apache.http.HttpEntity;
    import org.apache.http.NameValuePair;
    import org.apache.http.ParseException;
    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.impl.client.CloseableHttpClient;
    import org.apache.http.impl.client.HttpClients;
    import org.apache.http.message.BasicNameValuePair;
    import org.apache.http.util.EntityUtils;
    
    import com.google.common.collect.Lists;
    
    public class HttpClientTest02 {
    
    	public static void main(String[] args) {
    		CloseableHttpClient httpClient = HttpClients.createDefault();
    		CloseableHttpResponse response = null;
    		InputStream is = null;
    		String url = "http://localhost:8080/MyWebxTest/getCityByProvinceEname.do";
    		//封装请求参数
    		List<NameValuePair> params = Lists.newArrayList();
    		params.add(new BasicNameValuePair("cityEname", "henan"));
    		String str = "";
    		try {
    			//转换为键值对
    			str = EntityUtils.toString(new UrlEncodedFormEntity(params, Consts.UTF_8));
    			System.out.println(str);
    			//创建Get请求
    			HttpGet httpGet = new HttpGet(url+"?"+str);
    			//执行Get请求，
    			response = httpClient.execute(httpGet);
    			//得到响应体
    			HttpEntity entity = response.getEntity();
    			if(entity != null){
    				is = entity.getContent();
    				//转换为字节输入流
    				BufferedReader br = new BufferedReader(new InputStreamReader(is, Consts.UTF_8));
    				String body = null;
    				while((body=br.readLine()) != null){
    					System.out.println(body);
    				}
    			}
    		} catch (ParseException e) {
    			e.printStackTrace();
    		} catch (IOException e) {
    			e.printStackTrace();
    		} finally{
    			//关闭输入流，释放资源
    			if(is != null){
    				try {
    					is.close();
    				} catch (IOException e) {
    					e.printStackTrace();
    				}
    			}
    			//消耗实体内容
    			if(response != null){
    				try {
    					response.close();
    				} catch (IOException e) {
    					e.printStackTrace();
    				}
    			}
    			//关闭相应 丢弃http连接
    			if(httpClient != null){
    				try {
    					httpClient.close();
    				} catch (IOException e) {
    					e.printStackTrace();
    				}
    			}
    		}
    		
    	}
    }