HttpClient之請求參數

代碼：

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.創建HttpClient對象
          CloseableHttpClient httpClient= HttpClients.createDefault();
          //2.創建HttpGet對象，設置URL地址
        HttpGet httpGet=new HttpGet("https://www.baidu.com");

        //配置請求信息
        RequestConfig config=RequestConfig.custom().setConnectTimeout(1000)//創建連接的最長時間，單位是毫秒
                .setConnectionRequestTimeout(500)  //設置獲取連接的最長時間
                .setSocketTimeout(10*1000).build();  //設置數據傳輸的最長時間
        //給請求設置請求信息
        httpGet.setConfig(config);

        
        //使用httpClient發起響應獲取repsonse
        CloseableHttpResponse response=null;
        try {
            response=httpClient.execute(httpGet);
            //4.解析響應，獲取數據
            //判斷狀態碼是否是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();
            }
        }

    }
}

在這以get請求進行測試，設置背景顏色的就是配置請求信息的核心代碼，這里只是設置了一部分，我們還可以設置很多，比如設置代理等