Java クローラー スキル: さまざまな Web ページからのデータ クローリングに対処する

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;

public class StaticWebPageSpider {
    public static void main(String[] args) {
        try {
            URL url = new URL("http://www.example.com");
            URLConnection conn = url.openConnection();
            BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = reader.readLine()) != null) {
                // 处理网页内容
                System.out.println(line);
            }
            reader.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.chrome.ChromeOptions;

public class DynamicWebPageSpider {
    public static void main(String[] args) {
        // 设置Chrome浏览器路径
        System.setProperty("webdriver.chrome.driver", "/path/to/chromedriver");
        ChromeOptions options = new ChromeOptions();
        // 设置不显示浏览器窗口
        options.addArguments("--headless");
        // 创建Chrome浏览器实例
        WebDriver driver = new ChromeDriver(options);
        // 打开网页
        driver.get("http://www.example.com");
        // 获取网页内容
        String content = driver.getPageSource();
        // 处理网页内容
        System.out.println(content);
        // 关闭浏览器
        driver.quit();
    }
}

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 org.apache.http.util.EntityUtils;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;

public class AjaxDataSpider {
    public static void main(String[] args) {
        try {
            CloseableHttpClient httpClient = HttpClients.createDefault();
            // 设置请求URL
            HttpGet httpGet = new HttpGet("http://www.example.com/ajax_data");
            // 发送请求并获取响应
            HttpResponse response = httpClient.execute(httpGet);
            // 获取响应内容
            String content = EntityUtils.toString(response.getEntity());
            // 处理响应内容
            Document document = Jsoup.parse(content);
            String data = document.select("#data").text();
            System.out.println(data);
            // 关闭HttpClient
            httpClient.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}