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java使用httpcomponents发送get请求

2024-07-16 12:16:30   214人阅读

一、适用场景

　　在ESTful webservice中，get方法一般都是用来获取数据。我们可以使用httpcomponents组件来完成调用。

　　如我们需要发起get请求，携带的参数都是附加到请求的url后面。

　　url："http://www.xxxxx.com/message?id=000010"

二、代码示例

 

 1 package com.demo.test; 2  3 import java.io.IOException; 4  5 import org.apache.http.HttpEntity; 6 import org.apache.http.HttpStatus; 7 import org.apache.http.client.ClientProtocolException; 8 import org.apache.http.client.methods.CloseableHttpResponse; 9 import org.apache.http.client.methods.HttpGet;10 import org.apache.http.impl.client.CloseableHttpClient;11 import org.apache.http.impl.client.HttpClients;12 import org.apache.http.util.EntityUtils;13 14 public class Test2 {15 16     public static String sendInfo(String url, String param) {17         String geturl = String.format("%s?id=%s", url, param);18         CloseableHttpClient client = HttpClients.createDefault();19         HttpGet get = new HttpGet(geturl);20         String responseContent = null; // 响应内容21         CloseableHttpResponse response = null;22         try {23             response = client.execute(get);24             HttpEntity entity = response.getEntity();// 响应体25             if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {// 正确返回26                 responseContent = EntityUtils.toString(entity, "UTF-8");27             }28         } catch (ClientProtocolException e) {29             e.printStackTrace();30         } catch (IOException e) {31             e.printStackTrace();32         } finally {33             try {34                 if (response != null)35                     response.close();36                 if (client != null)37                     client.close();38             } catch (IOException e) {39                 e.printStackTrace();40             }41         }42         return responseContent;43     }44 45     public static void main(String[] args) {46         String param = "000010";47         String result = sendInfo("http://www.xxxxx.com/message", param);48         System.out.println(result);49     }50 }

　　请求成功后，后天会打印返回的信息。


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