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设计模式精讲(十八):模板方法模式 - 定义算法骨架

设计模式精讲(十八):模板方法模式 - 定义算法骨架

设计模式精讲(十八):模板方法模式 - 定义算法骨架

今天聊聊模板方法模式。这是最简单但最常用的设计模式之一,核心思想是:在父类定义算法骨架,子类实现具体步骤。

什么是模板方法模式?

模板方法模式定义一个操作中的算法骨架,将一些步骤延迟到子类中。模板方法使得子类可以在不改变算法结构的情况下,重新定义算法的某些步骤。

生活中的例子:考试答题。题目(模板)固定,每个学生(子类)的答案不同。但答题流程是一样的:读题→思考→作答→检查。

实际场景:数据导出

// 抽象类:定义算法骨架
public abstract class DataExporter
{
    // 模板方法:定义算法骨架(final,不允许子类覆盖)
    public void Export(string fileName)
    {
        Console.WriteLine($"\n=== 开始导出数据 ===");
        
        // 1. 打开文件
        var stream = OpenFile(fileName);
        
        // 2. 写入头部
        WriteHeader(stream);
        
        // 3. 获取数据
        var data = GetData();
        
        // 4. 写入数据(可选步骤,子类可以不实现)
        if (ShouldWriteData())
        {
            WriteData(stream, data);
        }
        
        // 5. 写入尾部
        WriteFooter(stream);
        
        // 6. 关闭文件
        CloseFile(stream);
        
        Console.WriteLine($"=== 导出完成 ===\n");
    }
    
    // 基本方法:子类必须实现
    protected abstract Stream OpenFile(string fileName);
    protected abstract void WriteHeader(Stream stream);
    protected abstract void WriteData(Stream stream, List<string[]> data);
    protected abstract void WriteFooter(Stream stream);
    protected abstract void CloseFile(Stream stream);
    
    // 钩子方法:子类可以选择实现
    protected virtual bool ShouldWriteData() => true;
    
    // 具体方法:所有子类共享
    protected virtual List<string[]> GetData()
    {
        Console.WriteLine("  📊 获取数据...");
        return new List<string[]>
        {
            new[] { "张三""28""北京" },
            new[] { "李四""32""上海" },
            new[] { "王五""25""广州" }
        };
    }
}

// 具体实现:CSV导出
public class CsvExporter : DataExporter
{
    private StreamWriter _writer;
    
    protected override Stream OpenFile(string fileName)
    {
        Console.WriteLine($"  📄 打开CSV文件: {fileName}");
        var stream = new FileStream(fileName, FileMode.Create);
        _writer = new StreamWriter(stream);
        return stream;
    }
    
    protected override void WriteHeader(Stream stream)
    {
        Console.WriteLine("  📝 写入CSV表头");
        _writer.WriteLine("姓名,年龄,城市");
    }
    
    protected override void WriteData(Stream stream, List<string[]> data)
    {
        Console.WriteLine($"  📝 写入{data.Count}行数据");
        foreach (var row in data)
        {
            _writer.WriteLine(string.Join(",", row));
        }
    }
    
    protected override void WriteFooter(Stream stream)
    {
        Console.WriteLine("  📝 CSV无需尾部");
    }
    
    protected override void CloseFile(Stream stream)
    {
        Console.WriteLine("  ✅ 关闭CSV文件");
        _writer?.Flush();
        stream?.Close();
    }
}

// 具体实现:JSON导出
public class JsonExporter : DataExporter
{
    private StreamWriter _writer;
    
    protected override Stream OpenFile(string fileName)
    {
        Console.WriteLine($"  📄 打开JSON文件: {fileName}");
        var stream = new FileStream(fileName, FileMode.Create);
        _writer = new StreamWriter(stream);
        return stream;
    }
    
    protected override void WriteHeader(Stream stream)
    {
        Console.WriteLine("  📝 写入JSON起始");
        _writer.WriteLine("[");
    }
    
    protected override void WriteData(Stream stream, List<string[]> data)
    {
        Console.WriteLine($"  📝 写入JSON数据");
        for (int i = 0; i < data.Count; i++)
        {
            var row = data[i];
            var comma = i < data.Count - 1 ? "," : "";
            _writer.WriteLine($"  {{\"name\": \"{row[0]}\", \"age\": {row[1]}, \"city\": \"{row[2]}\"}}{comma}");
        }
    }
    
    protected override void WriteFooter(Stream stream)
    {
        Console.WriteLine("  📝 写入JSON结束");
        _writer.WriteLine("]");
    }
    
    protected override void CloseFile(Stream stream)
    {
        Console.WriteLine("  ✅ 关闭JSON文件");
        _writer?.Flush();
        stream?.Close();
    }
}

// 具体实现:XML导出
public class XmlExporter : DataExporter
{
    private StreamWriter _writer;
    
    protected override Stream OpenFile(string fileName)
    {
        Console.WriteLine($"  📄 打开XML文件: {fileName}");
        var stream = new FileStream(fileName, FileMode.Create);
        _writer = new StreamWriter(stream);
        return stream;
    }
    
    protected override void WriteHeader(Stream stream)
    {
        Console.WriteLine("  📝 写入XML头部");
        _writer.WriteLine("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
        _writer.WriteLine("<users>");
    }
    
    protected override void WriteData(Stream stream, List<string[]> data)
    {
        Console.WriteLine($"  📝 写入XML数据");
        foreach (var row in data)
        {
            _writer.WriteLine("  <user>");
            _writer.WriteLine($"    <name>{row[0]}</name>");
            _writer.WriteLine($"    <age>{row[1]}</age>");
            _writer.WriteLine($"    <city>{row[2]}</city>");
            _writer.WriteLine("  </user>");
        }
    }
    
    protected override void WriteFooter(Stream stream)
    {
        Console.WriteLine("  📝 写入XML尾部");
        _writer.WriteLine("</users>");
    }
    
    protected override void CloseFile(Stream stream)
    {
        Console.WriteLine("  ✅ 关闭XML文件");
        _writer?.Flush();
        stream?.Close();
    }
}

// 使用示例
public class Program
{
    public static void Main()
    {
        // CSV导出
        var csvExporter = new CsvExporter();
        csvExporter.Export("data.csv");
        
        // JSON导出
        var jsonExporter = new JsonExporter();
        jsonExporter.Export("data.json");
        
        // XML导出
        var xmlExporter = new XmlExporter();
        xmlExporter.Export("data.xml");
    }
}

更实际的例子:银行账户操作

// 抽象类:银行账户
public abstract class BankAccount
{
    public string AccountNumber { get; }
    public decimal Balance { getprotected set; }
    
    protected BankAccount(string accountNumber, decimal initialBalance)
    {
        AccountNumber = accountNumber;
        Balance = initialBalance;
    }
    
    // 模板方法:存款流程
    public void Deposit(decimal amount)
    {
        Console.WriteLine($"\n=== 存款操作 ===");
        Console.WriteLine($"账户: {AccountNumber}");
        Console.WriteLine($"存入金额: ¥{amount:F2}");
        
        // 1. 验证金额
        ValidateAmount(amount);
        
        // 2. 计算利息(可选,储蓄账户有)
        var interest = CalculateDepositInterest(amount);
        
        // 3. 更新余额
        Balance += amount + interest;
        Console.WriteLine($"当前余额: ¥{Balance:F2}");
        
        // 4. 记录交易
        RecordTransaction("存款", amount);
        
        // 5. 发送通知(可选)
        SendNotification("存款", amount);
    }
    
    // 模板方法:取款流程
    public bool Withdraw(decimal amount)
    {
        Console.WriteLine($"\n=== 取款操作 ===");
        Console.WriteLine($"账户: {AccountNumber}");
        Console.WriteLine($"取款金额: ¥{amount:F2}");
        
        // 1. 验证金额
        ValidateAmount(amount);
        
        // 2. 检查余额
        if (!CheckBalance(amount))
        {
            Console.WriteLine("❌ 余额不足");
            return false;
        }
        
        // 3. 计算手续费(不同账户不同)
        var fee = CalculateWithdrawalFee(amount);
        Console.WriteLine($"手续费: ¥{fee:F2}");
        
        // 4. 更新余额
        Balance -= (amount + fee);
        Console.WriteLine($"当前余额: ¥{Balance:F2}");
        
        // 5. 记录交易
        RecordTransaction("取款", amount);
        
        // 6. 发送通知
        SendNotification("取款", amount);
        
        return true;
    }
    
    // 基本方法:所有账户相同
    protected virtual void ValidateAmount(decimal amount)
    {
        if (amount <= 0)
            throw new ArgumentException("金额必须大于0");
        Console.WriteLine("✅ 金额验证通过");
    }
    
    // 基本方法:所有账户相同
    protected virtual bool CheckBalance(decimal amount)
    {
        return Balance >= amount;
    }
    
    // 抽象方法:子类必须实现
    protected abstract decimal CalculateWithdrawalFee(decimal amount);
    protected abstract decimal CalculateDepositInterest(decimal amount);
    
    // 钩子方法:子类可选实现
    protected virtual void RecordTransaction(string type, decimal amount)
    {
        Console.WriteLine($"  📝 记录交易: {type} ¥{amount:F2}");
    }
    
    protected virtual void SendNotification(string type, decimal amount)
    {
        // 默认不发送通知
    }
}

// 具体实现:储蓄账户
public class SavingsAccount : BankAccount
{
    private readonly decimal _interestRate;
    
    public SavingsAccount(string accountNumber, decimal initialBalance, decimal interestRate = 0.03m)
        : base(accountNumber, initialBalance)

    {
        _interestRate = interestRate;
    }
    
    protected override decimal CalculateWithdrawalFee(decimal amount)
    {
        return 0;  // 储蓄账户无手续费
    }
    
    protected override decimal CalculateDepositInterest(decimal amount)
    {
        return amount * _interestRate;  // 有存款利息
    }
    
    protected override void SendNotification(string type, decimal amount)
    {
        Console.WriteLine($"  📱 发送短信通知: {type} ¥{amount:F2}");
    }
}

// 具体实现:信用卡账户
public class CreditCardAccount : BankAccount
{
    private readonly decimal _withdrawalFeeRate;
    
    public CreditCardAccount(string accountNumber, decimal creditLimit, decimal withdrawalFeeRate = 0.01m)
        : base(accountNumber, creditLimit)

    {
        _withdrawalFeeRate = withdrawalFeeRate;
    }
    
    protected override decimal CalculateWithdrawalFee(decimal amount)
    {
        return amount * _withdrawalFeeRate;  // 取现有手续费
    }
    
    protected override decimal CalculateDepositInterest(decimal amount)
    {
        return 0;  // 信用卡无存款利息
    }
    
    protected override bool CheckBalance(decimal amount)
    {
        return true;  // 信用卡可以透支
    }
}

// 使用示例
public class Program
{
    public static void Main()
    {
        // 储蓄账户
        var savings = new SavingsAccount("SA001"10000);
        savings.Deposit(1000);
        savings.Withdraw(500);
        
        // 信用卡账户
        var creditCard = new CreditCardAccount("CC001"50000);
        creditCard.Deposit(5000);
        creditCard.Withdraw(10000);  // 可以透支
    }
}

模板方法中的方法分类

1. 抽象方法

// 子类必须实现
protected abstract void DoSomething();

2. 具体方法

// 子类直接继承使用
protected void DoSomethingCommon() { ... }

3. 钩子方法

// 子类可以选择覆盖
protected virtual bool ShouldDoSomething() => true;

4. 模板方法

// 定义算法骨架,不允许子类覆盖
public void TemplateMethod()
{
    Step1();
    if (HookMethod())
    {
        Step2();
    }
    Step3();
}

优点

1. 代码复用

// 公共逻辑在父类,避免重复
// 子类只需实现差异部分

2. 控制扩展点

// 父类控制算法结构
// 子类只能在指定点扩展

3. 符合开闭原则

// 新增导出格式只需新增子类
// 不影响现有代码

缺点

1. 类数量增加

// 每种实现需要一个子类

2. 继承的限制

// Java/C#不支持多继承
// 一个类只能有一个父类

3. 子类影响父类

// 如果父类修改模板方法
// 所有子类都可能受影响

适用场景

✅ 推荐使用

  1. 算法骨架固定,步骤可变

    • 数据导出
    • 报表生成
    • 业务流程
  2. 代码复用

    • 多个类有相同逻辑
    • 只有部分步骤不同

❌ 不推荐使用

  1. 算法步骤差异大

    • 不同实现差异太多
  2. 需要灵活组合

    • 策略模式更合适

实际项目中的应用

1. ASP.NET Core 中间件

public abstract class Middleware
{
    protected readonly RequestDelegate _next;
    
    protected Middleware(RequestDelegate next)
    {
        _next = next;
    }
    
    // 模板方法
    public async Task InvokeAsync(HttpContext context)
    {
        // 前置处理
        await BeforeInvoke(context);
        
        // 调用下一个中间件
        await _next(context);
        
        // 后置处理
        await AfterInvoke(context);
    }
    
    protected virtual Task BeforeInvoke(HttpContext context) => Task.CompletedTask;
    protected virtual Task AfterInvoke(HttpContext context) => Task.CompletedTask;
}

2. 单元测试基类

public abstract class TestBase
{
    // 模板方法
    [TestInitialize]
    public void Setup()
    {
        SetupTestData();
        SetupMocks();
        SetupService();
    }
    
    protected abstract void SetupTestData();
    protected abstract void SetupMocks();
    protected virtual void SetupService() { }
}

最佳实践

1. 模板方法设为final/sealed

// C#中没有sealed方法,但可以通过不标记virtual实现
public void Export()  // 没有virtual,子类无法覆盖
{
    // ...
}

2. 合理使用钩子方法

// 提供默认实现,子类可选覆盖
protected virtual bool ShouldLog() => true;
protected virtual void OnCompleted() { }

3. 使用protected暴露扩展点

// public给客户端用
// protected给子类扩展
public void Process() { ... }
protected abstract void DoProcess();

总结

模板方法模式是"骨架+填充"的艺术,核心思想是:父类定义算法骨架,子类实现具体步骤

记住这个公式

  • 模板方法 = 算法骨架(不可变)
  • 抽象方法 = 必须实现的步骤
  • 钩子方法 = 可选实现的步骤

选型建议

  • 算法骨架固定?用模板方法
  • 多个子类有相同逻辑?用模板方法
  • 需要控制扩展点?用模板方法

下一期,我们聊聊迭代器模式——如何遍历集合而不暴露其内部结构。敬请期待!


💡 思考题:模板方法模式和策略模式都可以实现算法的变化,它们有什么区别?什么时候用模板方法,什么时候用策略?

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  1. CONNECT:[ UseTime:0.000595s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000721s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000309s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000282s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000494s ]
  6. SELECT * FROM `set` [ RunTime:0.000204s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000595s ]
  8. SELECT * FROM `article` WHERE `id` = 512751 LIMIT 1 [ RunTime:0.000461s ]
  9. UPDATE `article` SET `lasttime` = 1776035856 WHERE `id` = 512751 [ RunTime:0.004098s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000241s ]
  11. SELECT * FROM `article` WHERE `id` < 512751 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000441s ]
  12. SELECT * FROM `article` WHERE `id` > 512751 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000445s ]
  13. SELECT * FROM `article` WHERE `id` < 512751 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000876s ]
  14. SELECT * FROM `article` WHERE `id` < 512751 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000801s ]
  15. SELECT * FROM `article` WHERE `id` < 512751 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000775s ]
0.105135s