java使用httpcomponents发送get请求

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。