java+httpclient—— 一个稍微复杂的get请求

package jkcs;

import java.io.IOException;

import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.client.ClientProtocolException;
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;

public class jiekoumoni 
{

    public static void main(String[] args) throws ClientProtocolException, IOException 
    {
    
        
        CloseableHttpClient client = HttpClients.createDefault();    //创建一个http客户端
        
        
        
        HttpGet httpGet = new HttpGet("http://www.baidu.com"); // 通过httpget方式来实现我们的get请求
        
        
        
        
        CloseableHttpResponse Response = client.execute(httpGet);  // 通过client调用execute方法，得到我们的执行结果就是一个response，所有的数据都封装在response里面了
        
        
        //-----------------------------------------------------------------------

        
        System.out.println(Response.getStatusLine());  //HTTP/1.1 200 OK
        
        System.out.println(Response.getProtocolVersion());  //HTTP/1.1
        
        System.out.println(Response.getStatusLine().getStatusCode());  //200
        
        
        //-----------------------------------------------------------------------
        
        
        
        HttpEntity httpEntity = Response.getEntity();         //获取某个固定的响应头
        
        System.out.println(httpEntity.getContentType()); //Content-Type: text/html
        
        

        
        
        //-----------------------------------------------------------------------
        
        
        System.out.println(Response.getFirstHeader("Content-Type"));//Content-Type: text/html
        System.out.println(Response.getFirstHeader("Date"));   //Date: Sun, 03 May 2020 06:58:16 GMT
        
        //-----------------------------------------------------------------------
        
        Header[] headers = Response.getAllHeaders();    //获取所有响应头
        for (Header header : headers) 
        {
           System.out.println("Key : " + header.getName()+",         ," +" Value : " + header.getValue());
        }
        
        
        
        //-----------------------------------------------------------------------
        
        
        Response.close();  // 关闭
        
        
        

    }

}

执行结果：

HTTP/1.1 200 OK
HTTP/1.1
200

Content-Type: text/html
Content-Type: text/html
Date: Sun, 03 May 2020 06:58:16 GMT

Key : Content-Type, , Value : text/html
Key : Server, , Value : bfe
Key : Date, , Value : Sun, 03 May 2020 06:58:16 GMT

===========================================================

package jkcs;

import java.io.IOException;

import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.client.ClientProtocolException;
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;

public class jiekoumoni 
{

    public static void main(String[] args) throws ClientProtocolException, IOException, Exception 
    {
    
        
        CloseableHttpClient client = HttpClients.createDefault();    //创建一个http客户端
        
        HttpGet httpGet = new HttpGet("http://httpbin.org/get");// 通过httpPost方式来实现我们的get请求
        
        httpGet.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36");//伪装成浏览器请求
        
        CloseableHttpResponse Response = client.execute(httpGet);  // 通过client调用execute方法，得到我们的执行结果就是一个response，所有的数据都封装在response里面了
        
        
        //-----------------------------------------------------------------------

        
        System.out.println(Response.getStatusLine());  //HTTP/1.1 200 OK
        
        System.out.println(Response.getProtocolVersion());  //HTTP/1.1
        
        System.out.println(Response.getStatusLine().getStatusCode());  //200
        
        
        //-----------------------------------------------------------------------
        
        
        System.out.println(httpGet.getMethod());   //get
        
        System.out.println(httpGet.getURI());    //http://httpbin.org/get
        
        //-----------------------------------------------------------------------
        
        HttpEntity httpEntity = Response.getEntity();         //获取某个固定的响应头
        
        System.out.println(httpEntity.getContentType()); //Content-Type: text/html
        
        

        
        
        //-----------------------------------------------------------------------
        
        
        System.out.println(Response.getFirstHeader("Content-Type"));//Content-Type: text/html
        System.out.println(Response.getFirstHeader("Date"));   //Date: Sun, 03 May 2020 06:58:16 GMT
        
        //-----------------------------------------------------------------------
        
        Header[] headers = Response.getAllHeaders();    //获取所有响应头
        for (Header header : headers) 
        {
           System.out.println(header.getName()+":    "+ header.getValue());
        }
        
        
        
        //-----------------------------------------------------------------------
        

        
        Response.close();  // 关闭
        
        
        

    }

}

执行结果：

HTTP/1.1 200 OK
HTTP/1.1
200

GET
http://httpbin.org/get

Content-Type: application/json
Content-Type: application/json
Date: Sun, 03 May 2020 09:04:40 GMT

Date: Sun, 03 May 2020 09:04:40 GMT
Content-Type: application/json
Content-Length: 375
Connection: keep-alive
Server: gunicorn/19.9.0
Access-Control-Allow-Origin: *
Access-Control-Allow-Credentials: true