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90 lines
3.4 KiB
90 lines
3.4 KiB
package com.example.datacollect.command;
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import com.example.datacollect.model.Article;
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import com.example.datacollect.repository.ArticleRepository;
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import com.example.datacollect.strategy.CrawlStrategy;
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import com.example.datacollect.strategy.StrategyFactory;
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import org.jsoup.Jsoup;
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import org.jsoup.nodes.Document;
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import java.io.IOException;
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import java.util.List;
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public class AnalyzeCommand implements Command {
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private final StrategyFactory strategyFactory;
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public AnalyzeCommand(StrategyFactory strategyFactory) {
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this.strategyFactory = strategyFactory;
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}
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// 1. 实现 Command 接口的 getName() 方法
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@Override
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public String getName() {
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return "analyze";
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}
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// 2. 实现 Command 接口的 execute() 方法（必须和接口签名一致，带 ArticleRepository 参数）
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@Override
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public void execute(String[] args, ArticleRepository repository) {
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// 参数校验：用户必须传入要分析的URL
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if (args.length < 2) {
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System.out.println("[错误] 请输入要分析的URL，格式：analyze <url>");
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return;
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}
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String url = args[1];
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// 用工厂匹配对应的解析策略
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CrawlStrategy strategy = strategyFactory.getStrategy(url);
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if (strategy == null) {
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System.out.println("[错误] 不支持解析该URL：" + url);
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return;
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}
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// 爬取网页源码
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Document doc;
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try {
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doc = Jsoup.connect(url)
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.timeout(5000)
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.get();
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} catch (IOException e) {
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System.out.println("[错误] 网页爬取失败：" + e.getMessage());
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return;
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}
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// ====================== 作业核心逻辑 ======================
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// 复用策略解析网页，但不存入仓库（不调用 repository.add 或 addAll）
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List<Article> articles = strategy.parse(url, doc);
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// 输出统计信息
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printAnalysisResult(articles, url);
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// ==========================================================
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}
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/**
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* 打印分析结果：统计文章数量、标题平均长度等信息
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*/
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private void printAnalysisResult(List<Article> articles, String url) {
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System.out.println("\n===== 网页分析结果（不存储数据） =====");
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System.out.println("分析URL：" + url);
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System.out.println("解析到文章数量：" + articles.size());
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if (!articles.isEmpty()) {
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// 统计标题平均长度
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int totalTitleLength = 0;
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for (Article article : articles) {
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totalTitleLength += article.getTitle().length();
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}
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double avgTitleLength = (double) totalTitleLength / articles.size();
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System.out.printf("文章标题平均长度：%.2f 字符\n", avgTitleLength);
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// 打印前3篇文章标题预览
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System.out.println("\n前3篇文章标题预览：");
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for (int i = 0; i < Math.min(3, articles.size()); i++) {
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System.out.println((i + 1) + ". " + articles.get(i).getTitle());
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}
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} else {
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System.out.println("未解析到任何文章内容");
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}
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System.out.println("=====================================\n");
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}
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}
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