From 1781aded8053b540c5354b45730aba06930f2f95 Mon Sep 17 00:00:00 2001
From: HuangZhikai <386754646@qq.com>
Date: Sun, 31 May 2026 14:46:50 +0800
Subject: [PATCH] =?UTF-8?q?=E4=B8=8A=E4=BC=A0=E6=96=87=E4=BB=B6=E8=87=B3?=
 =?UTF-8?q?=20'project/command'?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 project/command/ExitCommand.java | 19 ++++++++++++++++++
 project/command/HelpCommand.java | 30 ++++++++++++++++++++++++++++
 project/command/ListCommand.java | 34 ++++++++++++++++++++++++++++++++
 3 files changed, 83 insertions(+)
 create mode 100644 project/command/ExitCommand.java
 create mode 100644 project/command/HelpCommand.java
 create mode 100644 project/command/ListCommand.java

diff --git a/project/command/ExitCommand.java b/project/command/ExitCommand.java
new file mode 100644
index 0000000..3347845
--- /dev/null
+++ b/project/command/ExitCommand.java
@@ -0,0 +1,19 @@
+package com.crawler.command;
+
+public class ExitCommand extends BaseCommand {
+    @Override
+    public String getName() {
+        return "exit";
+    }
+
+    @Override
+    public String getDescription() {
+        return "退出程序";
+    }
+
+    @Override
+    public void execute() {
+        System.out.println("退出程序...");
+        System.exit(0);
+    }
+}
\ No newline at end of file
diff --git a/project/command/HelpCommand.java b/project/command/HelpCommand.java
new file mode 100644
index 0000000..9ee4826
--- /dev/null
+++ b/project/command/HelpCommand.java
@@ -0,0 +1,30 @@
+package com.crawler.command;
+
+import java.util.List;
+
+public class HelpCommand extends BaseCommand {
+    private List<Command> commands;
+
+    public HelpCommand(List<Command> commands) {
+        this.commands = commands;
+    }
+
+    @Override
+    public String getName() {
+        return "help";
+    }
+
+    @Override
+    public String getDescription() {
+        return "显示所有可用指令";
+    }
+
+    @Override
+    public void execute() {
+        System.out.println("可用指令:");
+        System.out.println("---------");
+        for (Command cmd : commands) {
+            System.out.printf("%-8s : %s%n", cmd.getName(), cmd.getDescription());
+        }
+    }
+}
\ No newline at end of file
diff --git a/project/command/ListCommand.java b/project/command/ListCommand.java
new file mode 100644
index 0000000..0ce2331
--- /dev/null
+++ b/project/command/ListCommand.java
@@ -0,0 +1,34 @@
+package com.crawler.command;
+
+import java.util.List;
+
+public class ListCommand extends BaseCommand {
+    @Override
+    public String getName() {
+        return "list";
+    }
+
+    @Override
+    public String getDescription() {
+        return "查看使用过的指令历史";
+    }
+
+    @Override
+    public void execute() {
+        List<String> historyList = history.getHistory();
+        
+        System.out.println("========================================");
+        System.out.println("指令历史记录:");
+        System.out.println("========================================");
+        
+        if (historyList.isEmpty()) {
+            System.out.println("暂无指令记录");
+        } else {
+            for (int i = 0; i < historyList.size(); i++) {
+                System.out.printf("[%d] %s%n", i + 1, historyList.get(i));
+            }
+        }
+        
+        System.out.println("========================================");
+    }
+}
\ No newline at end of file