Provide Best Programming Tutorials

Java – HttpURLConnection Demo

HttpURLConnection

package urlconnectiondemo;

import java.net.HttpURLConnection;
import java.net.URL;

public class UrlConnectionDemo {
    public static void main(String[] args) {
        try {
            URL url = new URL("http://www.baidu.com");
            HttpURLConnection huc = (HttpURLConnection) url.openConnection();
            for (int i = 1; i <= 10; i++) {
                System.out.println(huc.getHeaderFieldKey(i) + " = " + huc.getHeaderField(i));
            }
            huc.disconnect();
        } catch (Exception e) {
            System.out.println(e);
        }
    }
}

Output

Accept-Ranges = bytes
Cache-Control = private, no-cache, no-store, proxy-revalidate, no-transform
Connection = Keep-Alive
Content-Length = 2381
Content-Type = text/html
Date = Thu, 03 Oct 2019 02:27:40 GMT
Etag = "588604f8-94d"
Last-Modified = Mon, 23 Jan 2017 13:28:24 GMT
Pragma = no-cache
Server = bfe/1.0.8.18

Apache HttpClient

package urlconnectiondemo;

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.util.Scanner;


public class HttpGetExample {

    public static void main(String args[]) throws Exception {

        //Creating a HttpClient object
        CloseableHttpClient httpclient = HttpClients.createDefault();

        //Creating a HttpGet object
        HttpGet httpget = new HttpGet("https://www.baidu.com");

        //Printing the method used
        System.out.println("Request Type: " + httpget.getMethod());

        System.out.println(httpget.getURI());
        System.out.println(httpget.getConfig());
        System.out.println(httpget.getProtocolVersion());
        System.out.println(httpget.getClass());
        System.out.println(httpget.getRequestLine());

        //Executing the Get request
        HttpResponse httpresponse = httpclient.execute(httpget);

        Scanner sc = new Scanner(httpresponse.getEntity().getContent());

        //Printing the status line
        System.out.println(httpresponse.getStatusLine());
        while (sc.hasNext()) {
            System.out.println(sc.nextLine());
        }
    }
}

Output

Request Type: GET
https://www.baidu.com
null
HTTP/1.1
class org.apache.http.client.methods.HttpGet
GET https://www.baidu.com HTTP/1.1
HTTP/1.1 200 OK
<!DOCTYPE html>
<!--STATUS OK--><html> <head><meta http-equiv=content-type content=text/html;charset=utf-8><meta http-equiv=X-UA-Compatible content=IE=Edge><meta content=always name=referrer><link rel=stylesheet type=text/css href=https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/r/www/cache/bdorz/baidu.min.css><title>百度一下，你就知道</title></head> <body link=#0000cc> <div id=wrapper> <div id=head> <div class=head_wrapper> <div class=s_form> <div class=s_form_wrapper> <div id=lg> <img hidefocus=true src=//www.baidu.com/img/bd_logo1.png width=270 height=129> </div> <form id=form name=f action=//www.baidu.com/s class=fm> <input type=hidden name=bdorz_come value=1> <input type=hidden name=ie value=utf-8> <input type=hidden name=f value=8> <input type=hidden name=rsv_bp value=1> <input type=hidden name=rsv_idx value=1> <input type=hidden name=tn value=baidu><span class="bg s_ipt_wr"><input id=kw name=wd class=s_ipt value maxlength=255 autocomplete=off autofocus=autofocus></span><span class="bg s_btn_wr"><input type=submit id=su value=百度一下 class="bg s_btn" autofocus></span> </form> </div> </div> <div id=u1> <a href=http://news.baidu.com name=tj_trnews class=mnav>新闻</a> <a href=https://www.hao123.com name=tj_trhao123 class=mnav>hao123</a> <a href=http://map.baidu.com name=tj_trmap class=mnav>地图</a> <a href=http://v.baidu.com name=tj_trvideo class=mnav>视频</a> <a href=http://tieba.baidu.com name=tj_trtieba class=mnav>贴吧</a> <noscript> <a href=http://www.baidu.com/bdorz/login.gif?login&tpl=mn&u=http%3A%2F%2Fwww.baidu.com%2f%3fbdorz_come%3d1 name=tj_login class=lb>登录</a> </noscript> <script>document.write('<a href="http://www.baidu.com/bdorz/login.gif?login&tpl=mn&u='+ encodeURIComponent(window.location.href+ (window.location.search === "" ? "?" : "&")+ "bdorz_come=1")+ '" name="tj_login" class="lb">登录</a>');
                </script> <a href=//www.baidu.com/more/ name=tj_briicon class=bri style="display: block;">更多产品</a> </div> </div> </div> <div id=ftCon> <div id=ftConw> <p id=lh> <a href=http://home.baidu.com>关于百度</a> <a href=http://ir.baidu.com>About Baidu</a> </p> <p id=cp>©2017 Baidu <a href=http://www.baidu.com/duty/>使用百度前必读</a>  <a href=http://jianyi.baidu.com/ class=cp-feedback>意见反馈</a> 京ICP证030173号  <img src=//www.baidu.com/img/gs.gif> </p> </div> </div> </div> </body> </html>
Post Views: 1,789

Leave a Reply

Close Menu