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>