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>