HttpClient之请求参数

代码：

package cn.itcast.crawler.test;

import org.apache.http.HttpEntity;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

import java.io.IOException;

public class HttpConfigTest {
    public static void main(String[] args)  {
        //1.创建HttpClient对象
          CloseableHttpClient httpClient= HttpClients.createDefault();
          //2.创建HttpGet对象，设置URL地址
        HttpGet httpGet=new HttpGet("https://www.baidu.com");

        //配置请求信息
        RequestConfig config=RequestConfig.custom().setConnectTimeout(1000)//创建连接的最长时间，单位是毫秒
                .setConnectionRequestTimeout(500)  //设置获取连接的最长时间
                .setSocketTimeout(10*1000).build();  //设置数据传输的最长时间
        //给请求设置请求信息
        httpGet.setConfig(config);

        
        //使用httpClient发起响应获取repsonse
        CloseableHttpResponse response=null;
        try {
            response=httpClient.execute(httpGet);
            //4.解析响应，获取数据
            //判断状态码是否是200
            if(response.getStatusLine().getStatusCode()==200){
                HttpEntity httpEntity=response.getEntity();
                String content=EntityUtils.toString(httpEntity,"utf8");
                System.out.println(content.length());
            }
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                response.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                httpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }
}

在这以get请求进行测试，设置背景颜色的就是配置请求信息的核心代码，这里只是设置了一部分，我们还可以设置很多，比如设置代理等