Google拥有一个Web搜索API，但是很早以前就已经弃用了它，现在没有标准的方法可以实现此目的。

基本上，谷歌搜索是一个HTTP GET请求，其中查询参数是URL的一部分，并且我们之前已经看到有许多不同的选项(例如Java HttpUrlConnection或者Apache HttpClient)来执行此搜索。
但是问题更多与解析HTML响应并从中获取有用信息有关。
因此，我选择使用jsoup，它是一个开放源代码HTML解析器，并且能够从给定的URL提取HTML。

因此，以下是一个简单的程序，可在Java程序中获取Google搜索结果，然后对其进行解析以找出搜索结果。

package com.theitroad.jsoup;

import java.io.IOException;
import java.util.Scanner;

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

public class GoogleSearchJava {

	public static final String GOOGLE_SEARCH_URL = "https://www.google.com/search";
	public static void main(String[] args) throws IOException {
		//Taking search term input from console
		Scanner scanner = new Scanner(System.in);
		System.out.println("Please enter the search term.");
		String searchTerm = scanner.nextLine();
		System.out.println("Please enter the number of results. Example: 5 10 20");
		int num = scanner.nextInt();
		scanner.close();
		
		String searchURL = GOOGLE_SEARCH_URL + "?q="+searchTerm+"&num="+num;
		//without proper User-Agent, we will get 403 error
		Document doc = Jsoup.connect(searchURL).userAgent("Mozilla/5.0").get();
		
		//below will print HTML data, save it to a file and open in browser to compare
		//System.out.println(doc.html());
		
		//If google search results HTML change the <h3 class="r" to <h3 class="r1"
		//we need to change below accordingly
		Elements results = doc.select("h3.r > a");

		for (Element result : results) {
			String linkHref = result.attr("href");
			String linkText = result.text();
			System.out.println("Text::" + linkText + ", URL::" + linkHref.substring(6, linkHref.indexOf("&")));
		}
	}

}

以下是上述程序的输出示例，我将HTML数据保存到文件中，并在浏览器中打开以确认输出，这就是我们想要的。
将输出与下图进行比较。

Please enter the search term.
theitroad
Please enter the number of results. Example: 5 10 20
20
Text::theitroad, URL::=https://www.theitroad.local/
Text::Java Interview Questions, URL::=https://www.theitroad.local/java-interview-questions
Text::Java design patterns, URL::=https://www.theitroad.local/tag/java-design-patterns
Text::Tutorials, URL::=https://www.theitroad.local/tutorials
Text::Java servlet, URL::=https://www.theitroad.local/tag/java-servlet
Text::Spring Framework Tutorial ..., URL::=https://www.theitroad.local/2888/spring-tutorial-spring-core-tutorial
Text::Java Design Patterns PDF ..., URL::=https://www.theitroad.local/6308/java-design-patterns-pdf-ebook-free-download-130-pages
Text::hyman Kumar (@theitroad) | Twitter, URL::=https://twitter.com/theitroad
Text::theitroad | Facebook, URL::=https://www.facebook.com/theitroad
Text::theitroad - Chrome Web Store - Google, URL::=https://chrome.google.com/webstore/detail/theitroad/ckdhakodkbphniaehlpackbmhbgfmekf
Text::Debian -- Details of package libsystemd-journal-dev in wheezy, URL::=https://packages.debian.org/wheezy/libsystemd-journal-dev
Text::Debian -- Details of package libsystemd-journal-dev in wheezy ..., URL::=https://packages.debian.org/wheezy-backports/libsystemd-journal-dev
Text::Debian -- Details of package libsystemd-journal-dev in sid, URL::=https://packages.debian.org/sid/libsystemd-journal-dev
Text::Debian -- Details of package libsystemd-journal-dev in jessie, URL::=https://packages.debian.org/jessie/libsystemd-journal-dev
Text::Ubuntu – Details of package libsystemd-journal-dev in trusty, URL::=https://packages.ubuntu.com/trusty/libsystemd-journal-dev
Text::libsystemd-journal-dev : Utopic (14.10) : Ubuntu - Launchpad, URL::=https://launchpad.net/ubuntu/utopic/%2Bpackage/libsystemd-journal-dev
Text::Debian -- Details of package libghc-libsystemd-journal-dev in jessie, URL::=https://packages.debian.org/jessie/libghc-libsystemd-journal-dev
Text::Advertise on theitroad | BuySellAds, URL::=https://buysellads.com/buy/detail/231824
Text::theitroad | LinkedIn, URL::=https://www.linkedin.com/groups/theitroad-6748558
Text::How to install libsystemd-journal-dev package in Ubuntu Trusty, URL::=https://www.howtoinstall.co/en/ubuntu/trusty/main/libsystemd-journal-dev/
Text::[global] auth supported = cephx ms bind ipv6 = true [mon] mon data ..., URL::=https://zooi.widodh.nl/ceph/ceph.conf
Text::UbuntuUpdates - Package "libsystemd-journal-dev" (trusty 14.04), URL::=https://www.ubuntuupdates.org/libsystemd-journal-dev
Text::[Journal]Dev'err - Cursus Honorum - Enjin, URL::=https://cursushonorum.enjin.com/holonet/m/23958869/viewthread/13220130-theitroaderr/post/last