上传文件至 'w9'

w9/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;
+
+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/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/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("Commands: crawl <url>, list, help, history, exit");
+    }
+}

w9/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("No command has been executed yet.");
+        } else {
+            view.printInfo("History commands:");
+            for (int i=0; i<history.size(); i++){
+                String s = history.get(i);
+                view.printInfo((i+1) + "." + s);
+            }
+        }
+    }
+}

w9/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);
+    }
+}