Java之使用HttpClient发送GET请求

时间：2023-03-08 22:40:39
Java之使用HttpClient发送GET请求 
 package LoadRunner;

 import org.apache.http.HttpEntity;

 import org.apache.http.HttpResponse;

 import org.apache.http.client.methods.HttpGet;

 import org.apache.http.impl.client.CloseableHttpClient;

 import org.apache.http.impl.client.HttpClients;

 import java.io.BufferedReader;

 import java.io.InputStreamReader;

 /*

 * 使用Apache的HttpClient发送GET和POST请求的步骤如下:

 *   1. 使用帮助类HttpClients创建CloseableHttpClient对象.

 *   2. 基于要发送的HTTP请求类型创建HttpGet或者HttpPost实例.

 *   3. 使用addHeader方法添加请求头部,诸如User-Agent, Accept-Encoding等参数.

 *   4. 对于POST请求,创建NameValuePair列表,并添加所有的表单参数.然后把它填充进HttpPost实体.

 *   5. 通过执行此HttpGet或者HttpPost请求获取CloseableHttpResponse实例

 *   6. 从此CloseableHttpResponse实例中获取状态码,错误信息,以及响应页面等等.

 *   7. 最后关闭HttpClient资源.

 * */

 /**

  * 使用HttpClient调用接口

  * 为性能测试写接口脚本

  */

 public class GetChannelLine {

     public static void main(String args[]) throws Exception {

         String channelId = "sdd";

         String clientId = "123";

         // 目标地址

         String url = "http://XXX.XXX.com.cn/arowana/channel/getChannelLine?channelId=" + channelId + "&clientId=" + clientId;

         HttpGet httpGet = new HttpGet(url);

         // 设置类型 "application/x-www-form-urlencoded" "application/json"

         httpGet.setHeader("Content-Type", "application/x-www-form-urlencoded");

         System.out.println("调用URL: " + httpGet.getURI());

 //        httpClient实例化

         CloseableHttpClient httpClient = HttpClients.createDefault();

         // 执行请求并获取返回

         HttpResponse response = httpClient.execute(httpGet);

 //        System.out.println("Response toString()" + response.toString());

         HttpEntity entity = response.getEntity();

         System.out.println("返回状态码：" + response.getStatusLine());

         //得到返回数据的长度；没有该参数返回-1

 //        if (entity != null) {

 //            System.out.println("返回消息内容长度: " + entity.getContentLength());

 //        }

         // 显示结果

         BufferedReader reader = new BufferedReader(new InputStreamReader(entity.getContent(), "UTF-8"));

         String line = null;

         StringBuffer responseSB = new StringBuffer();

         while ((line = reader.readLine()) != null) {

             responseSB.append(line);

         }

         System.out.println("返回消息：" + responseSB);

         reader.close();

         httpClient.close();

     }

 }

依赖包：

         <dependency>

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

             <artifactId>httpclient</artifactId>

             <version>4.5.5</version>

         </dependency>

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