article

w8/Pair.java

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+public class Pair<K, V> {
+    private K key;
+    private V value;
+
+    // 构造方法
+    public Pair(K key, V value) {
+        this.key = key;
+        this.value = value;
+    }
+
+    // Getter/Setter
+    public K getKey() {
+        return key;
+    }
+
+    public void setKey(K key) {
+        this.key = key;
+    }
+
+    public V getValue() {
+        return value;
+    }
+
+    public void setValue(V value) {
+        this.value = value;
+    }
+
+    // ✅ 修复后的静态 swap 方法
+    public static <K, V> Pair<V, K> swap(Pair<K, V> pair) {
+        return new Pair<>(pair.getValue(), pair.getKey());
+    }
+
+    // 重写 toString
+    @Override
+    public String toString() {
+        return "Pair{" + "key=" + key + ", value=" + value + '}';
+    }
+}

w8/TestPairSwap.java

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+public class TestPairSwap {
+    public static void main(String[] args) {
+        // 1. 原始 Pair：String + Integer（姓名-年龄）
+        Pair<String, Integer> person = new Pair<>("张三", 20);
+        System.out.println("交换前：" + person);
+
+        // 2. 调用静态 swap 方法，得到交换后的 Pair
+        Pair<Integer, String> swappedPerson = Pair.swap(person);
+        System.out.println("交换后：" + swappedPerson);
+
+        // 3. 相同类型的 Pair 也可以正常使用
+        Pair<Double, Double> point = new Pair<>(116.40, 39.90);
+        System.out.println("交换前坐标：" + point);
+        Pair<Double, Double> swappedPoint = Pair.swap(point);
+        System.out.println("交换后坐标：" + swappedPoint);
+    }
+}

w9/src/main/java/com/example/datacollect/Main.java

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+package src.main.java.com.example.datacollect;
+
+import src.main.java.com.example.datacollect.controller.CrawlerController;
+import src.main.java.com.example.datacollect.model.Article;
+import src.main.java.com.example.datacollect.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.printSuccess("Welcome to CLI Crawler (w9_1)! Type help for commands.");
+        while (true) {
+            controller.handle(view.readLine());
+        }
+    }
+}

w9/src/main/java/com/example/datacollect/command/Command.java

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+import src.main.java.com.example.datacollect.model.Article;
+import java.util.List;
+
+public interface Command {
+    String getName();
+    void execute(String[] args, List<Article> articles);
+}

w9/src/main/java/com/example/datacollect/command/CrawlCommand.java

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+import src.main.java.com.example.datacollect.model.Article;
+import src.main.java.com.example.datacollect.view.ConsoleView;
+import java.util.List;
+
+public class CrawlCommand implements Command {
+    private final ConsoleView view;
+
+    public CrawlCommand(ConsoleView view) {
+        this.view = view;
+    }
+
+    @Override
+    public String getName() {
+        return "crawl";
+    }
+
+    @Override
+    public void execute(String[] args, List<Article> articles) {
+        if (args.length < 2) {
+            view.printError("Usage: crawl <url>");
+            return;
+        }
+        view.printInfo("Stub: would crawl " + args[1]);
+    }
+}

w9/src/main/java/com/example/datacollect/command/ExitCommand.java

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+import src.main.java.com.example.datacollect.model.Article;
+import src.main.java.com.example.datacollect.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.printSuccess("Bye!");
+        System.exit(0);
+    }
+}

w9/src/main/java/com/example/datacollect/command/HelpCommand.java

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+import src.main.java.com.example.datacollect.model.Article;
+import src.main.java.com.example.datacollect.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("Commands: crawl <url>, list, help, exit");
+    }
+}

w9/src/main/java/com/example/datacollect/command/ListCommand.java

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+import src.main.java.com.example.datacollect.model.Article;
+import src.main.java.com.example.datacollect.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/src/main/java/com/example/datacollect/controller/CrawlerController.java

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+package src.main.java.com.example.datacollect.controller;
+
+import Command;
+import com.example.datacollect.command.CrawlCommand;
+import ExitCommand;
+import HelpCommand;
+import ListCommand;
+import src.main.java.com.example.datacollect.model.Article;
+import src.main.java.com.example.datacollect.view.ConsoleView;
+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 ConsoleView view;
+    private final List<Article> articles;
+
+    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));
+        register(new ExitCommand(view));
+    }
+
+    private void register(Command command) {
+        commands.put(command.getName(), command);
+    }
+
+    public void handle(String input) {
+        String text = input == null ? "" : input.trim();
+        if (text.isEmpty()) {
+            return;
+        }
+
+        String[] args = text.split("\\s+");
+        String cmdName = args[0].toLowerCase();
+        Command command = commands.get(cmdName);
+        if (command == null) {
+            view.printError("Unknown command: " + cmdName);
+            return;
+        }
+        command.execute(args, articles);
+    }
+}

w9/src/main/java/com/example/datacollect/model/Article.java

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+package src.main.java.com.example.datacollect.model;
+
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+
+public class Article {
+    private String title;
+    private String url;
+    private String content;
+
+    // ========== 新增字段 ==========
+    private String author;           // 作者
+    private LocalDateTime publishDate;  // 发布日期
+    // ============================
+
+    // ========== 原有构造器（保留兼容性）==========
+    public Article(String title, String url, String content) {
+        this.title = title;
+        this.url = url;
+        this.content = content;
+        this.author = "未知";  // 默认值
+        this.publishDate = LocalDateTime.now();  // 默认当前时间
+    }
+
+    // ========== 新增全参数构造器（推荐使用）==========
+    public Article(String title, String url, String content, String author, LocalDateTime publishDate) {
+        this.title = title;
+        this.url = url;
+        this.content = content;
+        this.author = author;
+        this.publishDate = publishDate;
+    }
+
+    // ========== Getter / Setter ==========
+    public String getTitle() { return title; }
+    public void setTitle(String title) { this.title = title; }
+
+    public String getUrl() { return url; }
+    public void setUrl(String url) { this.url = url; }
+
+    public String getContent() { return content; }
+    public void setContent(String content) { this.content = content; }
+
+    // ========== 新增字段的 Getter / Setter ==========
+    public String getAuthor() { return author; }
+    public void setAuthor(String author) { this.author = author; }
+
+    public LocalDateTime getPublishDate() { return publishDate; }
+    public void setPublishDate(LocalDateTime publishDate) { this.publishDate = publishDate; }
+
+    // ========== 日期格式化辅助方法 ==========
+    public String getFormattedPublishDate() {
+        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
+        return publishDate.format(formatter);
+    }
+
+    public String getFormattedPublishDate(String pattern) {
+        DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern);
+        return publishDate.format(formatter);
+    }
+
+    // ========== 修改 toString() 包含新字段 ==========
+    @Override
+    public String toString() {
+        return "Article{" +
+                "title='" + title + '\'' +
+                ", url='" + url + '\'' +
+                ", author='" + author + '\'' +
+                ", publishDate=" + getFormattedPublishDate() +
+                '}';
+    }
+}

w9/src/main/java/com/example/datacollect/view/ConsoleView.java

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+package src.main.java.com.example.datacollect.view;
+
+import src.main.java.com.example.datacollect.model.Article;
+import java.util.List;
+import java.util.Scanner;
+
+public class ConsoleView {
+    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());
+        }
+    }
+}

w9/target/maven-archiver/pom.properties

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+#Generated by Maven
+#Thu Apr 30 11:50:54 CST 2026
+artifactId=datacollect-cli
+groupId=com.example
+version=0.1.0