作业

.idea/workspace.xml

@@ -2,7 +2,7 @@
 <project version="4">
   <component name="ChangeListManager">
     <list default="true" id="8e3e51eb-8beb-4b33-b423-c0d05e3bc0cd" name="Changes" comment="">
-      <change afterPath="$PROJECT_DIR$/w5/VehicleTest.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -52,6 +52,7 @@
       <workItem from="1775042617092" duration="882000" />
       <workItem from="1775104128296" duration="4129000" />
       <workItem from="1775653218714" duration="2004000" />
+      <workItem from="1779354682588" duration="1252000" />
     </task>
     <servers />
   </component>

w10/AnalyzeCommand.java

@@ -0,0 +1,76 @@
+package com.example.datacollect.command;
+
+import com.example.datacollect.factory.StrategyFactory;
+import com.example.datacollect.model.Article;
+import com.example.datacollect.view.ConsoleView;
+import java.util.List;
+import java.util.regex.Pattern;
+
+public class AnalyzeCommand implements Command {
+    // URL 格式校验正则（和 CrawlCommand 保持一致）
+    private static final Pattern URL_PATTERN =
+            Pattern.compile("^(https?://)?([\\w-]+\\.)+[\\w-]+(/[\\w-./?%&=]*)*$");
+
+    private final ConsoleView view;
+    private final StrategyFactory strategyFactory;
+
+    // 构造方法：只依赖 View 和 StrategyFactory，不依赖 Repository
+    public AnalyzeCommand(ConsoleView view, StrategyFactory strategyFactory) {
+        this.view = view;
+        this.strategyFactory = strategyFactory;
+    }
+
+    @Override
+    public String getName() {
+        // 命令名：analyze
+        return "analyze";
+    }
+
+    @Override
+    public void execute(String[] args, List<Article> unused) {
+        // 1. 校验参数
+        if (args.length < 2) {
+            view.printError("用法:analyze <url>");
+            return;
+        }
+
+        String url = args[1];
+
+        // 2. 校验 URL 格式
+        if (!isValidUrl(url)) {
+            view.printError("无效的 URL 格式：" + url);
+            return;
+        }
+
+        try {
+            // 3. 复用 StrategyFactory 获取策略，解析 URL
+            List<Article> parsedArticles = strategyFactory.getStrategy(url).crawl(url);
+
+            // 4. 关键：只输出统计信息，不存入 ArticleRepository
+            printAnalysisResult(url, parsedArticles);
+
+        } catch (Exception e) {
+            view.printError("解析失败：" + e.getMessage());
+        }
+    }
+
+    /**
+     * 只输出解析结果，不修改任何数据存储
+     */
+    private void printAnalysisResult(String url, List<Article> articles) {
+        view.printInfo("===== 解析统计结果 =====");
+        view.printInfo("目标 URL:" + url);
+        view.printInfo("解析到文章数量：" + articles.size());
+
+        if (!articles.isEmpty()) {
+            Article first = articles.get(0);
+            view.printInfo("首篇文章标题：" + first.getTitle());
+            view.printInfo("首篇文章作者：" + first.getAuthor());
+            view.printInfo("首篇发布日期：" + first.getPublishDate());
+        }
+    }
+
+    private boolean isValidUrl(String url) {
+        return url != null && URL_PATTERN.matcher(url).matches();
+    }
+}

w10/ArticleRepository.java

@@ -0,0 +1,43 @@
+package com.example.datacollect.repository;
+
+import com.example.datacollect.model.Article;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+public class ArticleRepository {
+    private final List<Article> articles = new ArrayList<>();
+
+    public void add(Article article) {
+        if (article == null) {
+            throw new IllegalArgumentException("Article cannot be null");
+        }
+        articles.add(article);
+    }
+
+    public void addAll(List<Article> newArticles) {
+        // 防御 null：传入的集合不能为 null
+        if (newArticles == null) {
+            return;
+        }
+        // 遍历添加，同时防御集合中的 null 元素
+        for (Article article : newArticles) {
+            if (article != null) {
+                articles.add(article);
+            }
+        }
+    }
+
+    public List<Article> getAll() {
+        // 返回不可修改集合（作业要求：防止外部篡改）
+        return Collections.unmodifiableList(articles);
+    }
+
+    public int size() {
+        return articles.size();
+    }
+
+    public void clear() {
+        articles.clear();
+    }
+}

w11/RetryUtils.java

@@ -0,0 +1,40 @@
+package com.example.datacollect.utils;
+
+/**
+ * 指数退避重试工具类
+ * wait = 500 * 2^attempt
+ */
+public class RetryUtils {
+
+    // 基础延迟 500ms
+    private static final long BASE_DELAY_MS = 500;
+
+    @FunctionalInterface
+    public interface RetryTask<T> {
+        T run() throws Exception;
+    }
+
+    /**
+     * 执行带指数退避的重试
+     * @param maxRetries 最大重试次数（不含第一次）
+     * @param task 要执行的任务
+     * @return 执行结果
+     * @throws Exception 最后一次失败抛出
+     */
+    public static <T> T retry(int maxRetries, RetryTask<T> task) throws Exception {
+        int attempt = 0;
+        while (true) {
+            try {
+                return task.run();
+            } catch (Exception e) {
+                if (attempt >= maxRetries) {
+                    throw e; // 重试次数用完，抛出
+                }
+                // 指数退避：500 * 2^attempt
+                long delay = BASE_DELAY_MS * (1L << attempt);
+                Thread.sleep(delay);
+                attempt++;
+            }
+        }
+    }
+}

w11/UrlFormatException.java

@@ -0,0 +1,15 @@
+package com.example.datacollect.exception;
+
+/**
+ * URL 格式错误异常
+ */
+public class UrlFormatException extends RuntimeException {
+
+    public UrlFormatException(String message) {
+        super(message);
+    }
+
+    public UrlFormatException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}

w9/Main.java

@@ -0,0 +1,23 @@
+package com.example.datacollect.w9;
+
+import com.example.datacollect.w9.controller.CrawlerController;
+import com.example.datacollect.w9.model.Article;
+import com.example.datacollect.w9.view.ConsoleView;
+import java.util.ArrayList;
+import java.util.List;
+
+public class Main {
+    public static void main(String[] args) {
+        ConsoleView view = new ConsoleView();
+        List<Article> articles = new ArrayList<>();
+        CrawlerController controller = new CrawlerController(view, articles);
+
+        view.printInfo("=== 文章爬虫系统已启动 ===");
+        view.printInfo("输入 help 查看命令");
+
+        while (true) {
+            String input = view.readLine();
+            controller.handle(input);
+        }
+    }
+}

w9/command/Command.java

@@ -0,0 +1,9 @@
+package com.example.datacollect.w9.command;
+
+import com.example.datacollect.w9.model.Article;
+import java.util.List;
+
+public interface Command {
+    String getName();
+    void execute(String[] args, List<Article> articles);
+}

w9/command/CrawlCommand.java

@@ -0,0 +1,51 @@
+package com.example.datacollect.w9.command;
+
+import com.example.datacollect.w9.model.Article;
+import com.example.datacollect.w9.view.ConsoleView;
+import java.util.List;
+import java.util.regex.Pattern;
+
+public class CrawlCommand implements Command {
+    private static final Pattern URL_PATTERN =
+            Pattern.compile("^(https?://)?([\\w-]+\\.)+[\\w-]+(/[\\w-./?%&=]*)*$");
+
+    private final ConsoleView view;
+    private final List<Article> articles;
+
+    public CrawlCommand(ConsoleView view, List<Article> articles) {
+        this.view = view;
+        this.articles = articles;
+    }
+
+    @Override
+    public String getName() {
+        return "crawl";
+    }
+
+    @Override
+    public void execute(String[] args, List<Article> articles) {
+        if (args.length < 2) {
+            view.printError("用法：crawl <url>");
+            return;
+        }
+        String url = args[1];
+        if (!isValidUrl(url)) {
+            view.printError("URL 格式不正确");
+            return;
+        }
+        // 模拟爬取
+        Article art = new Article(
+                "模拟标题-" + (articles.size() + 1),
+                url,
+                "模拟正文内容",
+                "模拟作者",
+                "2026-05-31"
+        );
+        articles.add(art);
+        view.printSuccess("爬取成功：" + art.getTitle());
+    }
+
+    private boolean isValidUrl(String url) {
+        return url != null && URL_PATTERN.matcher(url).matches();
+    }
+}

w9/command/ExitCommand.java

@@ -0,0 +1,24 @@
+package com.example.datacollect.w9.command;
+
+import com.example.datacollect.w9.model.Article;
+import com.example.datacollect.w9.view.ConsoleView;
+import java.util.List;
+
+public class ExitCommand implements Command {
+    private final ConsoleView view;
+
+    public ExitCommand(ConsoleView view) {
+        this.view = view;
+    }
+
+    @Override
+    public String getName() {
+        return "exit";
+    }
+
+    @Override
+    public void execute(String[] args, List<Article> articles) {
+        view.printInfo("程序退出");
+        System.exit(0);
+    }
+}

w9/command/HelpCommand.java

@@ -0,0 +1,28 @@
+package com.example.datacollect.w9.command;
+
+import com.example.datacollect.w9.model.Article;
+import com.example.datacollect.w9.view.ConsoleView;
+import java.util.List;
+
+public class HelpCommand implements Command {
+    private final ConsoleView view;
+
+    public HelpCommand(ConsoleView view) {
+        this.view = view;
+    }
+
+    @Override
+    public String getName() {
+        return "help";
+    }
+
+    @Override
+    public void execute(String[] args, List<Article> articles) {
+        view.printInfo("=== 可用命令 ===");
+        System.out.println("help          显示帮助");
+        System.out.println("list          列出所有文章");
+        System.out.println("crawl <url>  爬取文章（或简写 c <url>）");
+        System.out.println("history       查看命令历史");
+        System.out.println("exit          退出程序");
+    }
+}

w9/command/HistoryCommand.java

@@ -0,0 +1,32 @@
+package com.example.datacollect.w9.command;
+
+import com.example.datacollect.w9.model.Article;
+import com.example.datacollect.w9.view.ConsoleView;
+import java.util.List;
+
+public class HistoryCommand implements Command {
+    private final ConsoleView view;
+    private final List<String> history;
+
+    public HistoryCommand(ConsoleView view, List<String> history) {
+        this.view = view;
+        this.history = history;
+    }
+
+    @Override
+    public String getName() {
+        return "history";
+    }
+
+    @Override
+    public void execute(String[] args, List<Article> articles) {
+        if (history.isEmpty()) {
+            view.printInfo("暂无历史记录");
+            return;
+        }
+        view.printInfo("=== 命令历史 ===");
+        for (int i = 0; i < history.size(); i++) {
+            System.out.println((i + 1) + ". " + history.get(i));
+        }
+    }
+}

w9/command/ListCommand.java

@@ -0,0 +1,23 @@
+package com.example.datacollect.w9.command;
+
+import com.example.datacollect.w9.model.Article;
+import com.example.datacollect.w9.view.ConsoleView;
+import java.util.List;
+
+public class ListCommand implements Command {
+    private final ConsoleView view;
+
+    public ListCommand(ConsoleView view) {
+        this.view = view;
+    }
+
+    @Override
+    public String getName() {
+        return "list";
+    }
+
+    @Override
+    public void execute(String[] args, List<Article> articles) {
+        view.display(articles);
+    }
+}

w9/controller/CrawlerController.java

@@ -0,0 +1,57 @@
+package com.example.datacollect.w9.controller;
+
+import com.example.datacollect.w9.command.*;
+import com.example.datacollect.w9.model.Article;
+import com.example.datacollect.w9.view.ConsoleView;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class CrawlerController {
+    private final Map<String, Command> commands = new HashMap<>();
+    private final Map<String, String> aliases = new HashMap<>();
+    private final ConsoleView view;
+    private final List<Article> articles;
+    private final List<String> history = new ArrayList<>();
+
+    public CrawlerController(ConsoleView view, List<Article> articles) {
+        this.view = view;
+        this.articles = articles;
+        register(new HelpCommand(view));
+        register(new ListCommand(view));
+        register(new CrawlCommand(view, articles));
+        register(new ExitCommand(view));
+        register(new HistoryCommand(view, history));
+        registerAlias("c", "crawl"); // 别名 c = crawl
+    }
+
+    private void register(Command command) {
+        commands.put(command.getName(), command);
+    }
+
+    private void registerAlias(String alias, String commandName) {
+        aliases.put(alias, commandName);
+    }
+
+    public void handle(String input) {
+        String text = input == null ? "" : input.trim();
+        if (text.isEmpty()) return;
+
+        history.add(text);
+
+        String[] args = text.split("\\s+");
+        String cmdName = args[0].toLowerCase();
+
+        if (aliases.containsKey(cmdName)) {
+            cmdName = aliases.get(cmdName);
+        }
+
+        Command command = commands.get(cmdName);
+        if (command == null) {
+            view.printError("Unknown command: " + cmdName);
+            return;
+        }
+        command.execute(args, articles);
+    }
+}

w9/model/Article.java

@@ -0,0 +1,46 @@
+package com.example.datacollect.w9.model;
+
+public class Article {
+    private String title;
+    private String url;
+    private String content;
+    private String author;
+    private String publishDate;
+
+    public Article(String title, String url, String content) {
+        this.title = title;
+        this.url = url;
+        this.content = content;
+    }
+
+    public Article(String title, String url, String content, String author, String publishDate) {
+        this.title = title;
+        this.url = url;
+        this.content = content;
+        this.author = author;
+        this.publishDate = publishDate;
+    }
+
+    // getter / setter
+    public String getTitle() { return title; }
+    public String getUrl() { return url; }
+    public String getContent() { return content; }
+    public String getAuthor() { return author; }
+    public String getPublishDate() { return publishDate; }
+
+    public void setTitle(String title) { this.title = title; }
+    public void setUrl(String url) { this.url = url; }
+    public void setContent(String content) { this.content = content; }
+    public void setAuthor(String author) { this.author = author; }
+    public void setPublishDate(String publishDate) { this.publishDate = publishDate; }
+
+    @Override
+    public String toString() {
+        return "Article{" +
+                "title='" + title + '\'' +
+                ", url='" + url + '\'' +
+                ", author='" + author + '\'' +
+                ", publishDate='" + publishDate + '\'' +
+                '}';
+    }
+}

w9/view/ConsoleView.java

@@ -0,0 +1,43 @@
+package com.example.datacollect.w9.view;
+
+import com.example.datacollect.w9.model.Article;
+import java.util.List;
+import java.util.Scanner;
+
+public class ConsoleView {
+    // 颜色
+    private static final String ANSI_RESET = "\u001B[0m";
+    private static final String ANSI_GREEN = "\u001B[32m";
+    private static final String ANSI_RED = "\u001B[31m";
+    private static final String ANSI_BLUE = "\u001B[34m";
+
+    private final Scanner scanner = new Scanner(System.in);
+
+    public String readLine() {
+        System.out.print("> ");
+        return scanner.nextLine();
+    }
+
+    public void printSuccess(String msg) {
+        System.out.println(ANSI_GREEN + msg + ANSI_RESET);
+    }
+
+    public void printError(String msg) {
+        System.out.println(ANSI_RED + msg + ANSI_RESET);
+    }
+
+    public void printInfo(String msg) {
+        System.out.println(ANSI_BLUE + msg + ANSI_RESET);
+    }
+
+    public void display(List<Article> articles) {
+        if (articles.isEmpty()) {
+            printInfo("暂无文章，请先执行 crawl。");
+            return;
+        }
+        for (int i = 0; i < articles.size(); i++) {
+            Article a = articles.get(i);
+            System.out.println((i + 1) + ". " + a.getTitle() + " | " + a.getUrl());
+        }
+    }
+}