第9周作业

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

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+package com.example.datacollect;
+
+import com.example.datacollect.controller.CrawlerController;
+import com.example.datacollect.model.Article;
+import 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/java-cli/src/main/java/com/example/datacollect/command/Command.java

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

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

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+package com.example.datacollect.command;
+
+import com.example.datacollect.model.Article;
+import com.example.datacollect.view.ConsoleView;
+import java.util.List;
+import java.util.regex.Pattern;
+
+public class CrawlCommand implements Command {
+    private final ConsoleView view;
+    private static final Pattern URL_PATTERN = Pattern.compile(
+            "^(https?://)?([\\w-]+\\.)+[\\w-]+(/[\\w-./?%&=]*)?$"
+    );
+
+    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;
+        }
+        
+        String url = args[1];
+        if (!isValidUrl(url)) {
+            view.printError("Invalid URL format: " + url);
+            view.printInfo("URL should start with http:// or https://");
+            return;
+        }
+        
+        view.printInfo("Stub: would crawl " + url);
+    }
+
+    private boolean isValidUrl(String url) {
+        if (url == null || url.isEmpty()) {
+            return false;
+        }
+        if (!url.startsWith("http://") && !url.startsWith("https://")) {
+            return false;
+        }
+        return URL_PATTERN.matcher(url).matches();
+    }
+}

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

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+package com.example.datacollect.command;
+
+import com.example.datacollect.model.Article;
+import 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/java-cli/src/main/java/com/example/datacollect/command/HelpCommand.java

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+package com.example.datacollect.command;
+
+import com.example.datacollect.model.Article;
+import 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("Available commands:");
+        view.printInfo("  crawl <url>  - 爬取指定URL的文章 (别名: c)");
+        view.printInfo("  list         - 列出所有已爬取的文章 (别名: l)");
+        view.printInfo("  history      - 显示命令历史记录 (别名: hi)");
+        view.printInfo("  help         - 显示帮助信息 (别名: h)");
+        view.printInfo("  exit         - 退出程序");
+        view.printInfo("\nURL格式要求: 必须以 http:// 或 https:// 开头");
+    }
+}

w9/java-cli/src/main/java/com/example/datacollect/command/HistoryCommand.java

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+package com.example.datacollect.command;
+
+import com.example.datacollect.model.Article;
+import com.example.datacollect.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("暂无命令历史记录。");
+            return;
+        }
+        view.printInfo("命令历史记录:");
+        for (int i = 0; i < history.size(); i++) {
+            System.out.println((i + 1) + ". " + history.get(i));
+        }
+    }
+
+    public void addToHistory(String command) {
+        history.add(command);
+    }
+}

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

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+package com.example.datacollect.command;
+
+import com.example.datacollect.model.Article;
+import 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/java-cli/src/main/java/com/example/datacollect/controller/CrawlerController.java

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+package com.example.datacollect.controller;
+
+import com.example.datacollect.command.Command;
+import com.example.datacollect.command.CrawlCommand;
+import com.example.datacollect.command.ExitCommand;
+import com.example.datacollect.command.HelpCommand;
+import com.example.datacollect.command.HistoryCommand;
+import com.example.datacollect.command.ListCommand;
+import com.example.datacollect.model.Article;
+import com.example.datacollect.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> commandHistory = new ArrayList<>();
+    private HistoryCommand historyCommand;
+
+    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));
+        
+        historyCommand = new HistoryCommand(view, commandHistory);
+        register(historyCommand);
+        
+        registerAlias("c", "crawl");
+        registerAlias("h", "help");
+        registerAlias("l", "list");
+        registerAlias("hi", "history");
+    }
+
+    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;
+        }
+
+        commandHistory.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/java-cli/src/main/java/com/example/datacollect/model/Article.java

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+package com.example.datacollect.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;
+    }
+
+    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;
+    }
+
+    public String getAuthor() {
+        return author;
+    }
+
+    public void setAuthor(String author) {
+        this.author = author;
+    }
+
+    public String getPublishDate() {
+        return publishDate;
+    }
+
+    public void setPublishDate(String publishDate) {
+        this.publishDate = publishDate;
+    }
+
+    @Override
+    public String toString() {
+        return "Article{"
+                + "title='" + title + '\''
+                + ", url='" + url + '\''
+                + ", author='" + author + '\''
+                + ", publishDate='" + publishDate + '\''
+                + '}';
+    }
+}

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

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+package com.example.datacollect.view;
+
+import 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[38;5;48m";
+    private static final String ANSI_RED = "\u001B[38;5;196m";
+    private static final String ANSI_BLUE = "\u001B[38;5;39m";
+    private static final String ANSI_DARK_BG = "\u001B[48;5;234m";
+    private static final String ANSI_WHITE = "\u001B[38;5;255m";
+
+    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());
+        }
+    }
+}