java/w11/Main.java

import com.example.datacollect.*;

public class Main {
    public static void main(String[] args) {
        CrawlStrategy strategyA = new ASiteCrawlStrategyImpl();
        CrawlStrategy strategyB = new BSiteCrawlStrategyImpl();
        CrawlStrategy strategyC = new CSiteCrawlStrategyImpl();
        CrawlStrategy strategyD = new DSiteCrawlStrategyImpl();
        
        strategyA.crawl("http://www.example-a.com");
        strategyB.crawl("http://www.example-b.com");
        strategyC.crawl("http://www.example-c.com");
        strategyD.crawl("http://www.example-d.com");
        
        try {
            throw new NetworkException("连接超时");
        } catch (CrawlException e) {
            System.out.println("捕获异常: " + e.getMessage());
        }
        
        try {
            throw new ParseException("HTML格式错误");
        } catch (CrawlException e) {
            System.out.println("捕获异常: " + e.getMessage());
        }
        
        try {
            throw new UnsupportedSiteException("UNKNOWN");
        } catch (CrawlException e) {
            System.out.println("捕获异常: " + e.getMessage());
        }
    }
}