软件工程：结构化设计方法

📌目录

• ⚖️ 结构化设计方法：面向数据流的设计技术
• • 🎯 一、结构化设计方法概述
  • • （一）结构化设计方法的定义
    • （二）结构化设计方法的特点
    • （三）结构化设计方法的地位
  • 📦 二、结构化设计方法的基本概念
  • • （一）数据流类型
    • （二）变换型数据流
    • （三）事务型数据流
  • 🌐 三、结构化设计方法的步骤
  • • （一）设计步骤
    • （二）数据流分析
  • 📊 四、变换分析
  • • （一）变换分析的定义
    • （二）变换分析步骤
    • （三）变换分析实例
    • （四）变换分析详解
  • 💡 五、事务分析
  • • （一）事务分析的定义
    • （二）事务分析步骤
    • （三）事务分析实例
    • （四）事务分析详解
  • 📋 六、结构化设计方法的优化
  • • （一）优化目标
    • （二）优化原则
    • （三）优化策略
    • （四）结构优化示例
  • 📝 七、结构化设计方法实例
  • • （一）实例背景
    • （二）数据流图
    • （三）变换分析
    • （四）详细设计
  • 📝 总结

⚖️ 结构化设计方法：面向数据流的设计技术

结构化设计方法（Structured Design, SD）是由Yourdon和Constantine提出的一种面向数据流的软件设计方法。它将数据流图映射为软件结构，是概要设计阶段的重要设计方法。本文将详细介绍结构化设计方法的基本概念、设计步骤、变换分析和事务分析。

🎯 一、结构化设计方法概述

（一）结构化设计方法的定义

结构化设计方法（Structured Design, SD）是一种面向数据流的软件设计方法，它将数据流图映射为软件结构。

结构化设计概念：

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结构化设计方法

数据流图

映射

软件结构

需求分析产出

模块结构图

（二）结构化设计方法的特点

方法特点：

（三）结构化设计方法的地位

在设计方法中的地位：

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设计方法

结构化设计

面向对象设计

Jackson方法

面向数据流

面向对象

面向数据结构

📦 二、结构化设计方法的基本概念

（一）数据流类型

数据流类型：

结构化设计方法将数据流分为两种类型：

（二）变换型数据流

变换型数据流：

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输入

输入处理

变换中心

输出处理

输出

组成要素：

（三）事务型数据流

事务型数据流：

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类型1

类型2

类型3

输入

事务中心

事务类型

处理1

处理2

处理3

组成要素：

🌐 三、结构化设计方法的步骤

（一）设计步骤

设计步骤：

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变换型

事务型

结构化设计步骤

分析数据流

确定数据流类型

数据流类型

变换分析

事务分析

设计初始结构

优化结构

编写文档

步骤详解：

（二）数据流分析

数据流分析：

分析数据流图，识别数据流的类型。

分析要点：

📊 四、变换分析

（一）变换分析的定义

变换分析是将变换型数据流图映射为软件结构的方法。

变换分析概念：

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变换分析

识别变换中心

设计顶层结构

设计输入分支

设计输出分支

设计变换分支

（二）变换分析步骤

变换分析步骤：

（三）变换分析实例

数据流图：

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原始数据

输入处理

数据变换

输出处理

结果数据

变换分析过程：

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主控模块

输入模块

变换模块

输出模块

读入数据

验证数据

计算处理

格式化输出

写入文件

（四）变换分析详解

步骤1：确定变换中心

在数据流图中，找到核心变换部分。

步骤2：设计顶层结构

设计主控模块，调用输入、变换、输出模块。

步骤3：设计输入分支

设计输入处理模块，完成数据读入和验证。

步骤4：设计输出分支

设计输出处理模块，完成数据格式化和输出。

步骤5：设计变换分支

设计变换处理模块，完成核心数据处理。

💡 五、事务分析

（一）事务分析的定义

事务分析是将事务型数据流图映射为软件结构的方法。

事务分析概念：

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事务分析

识别事务中心

识别事务类型

设计接收分支

设计发送分支

设计处理分支

（二）事务分析步骤

事务分析步骤：

（三）事务分析实例

数据流图：

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类型1

类型2

类型3

事务输入

事务分析

事务类型

处理1

处理2

处理3

事务分析过程：

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类型1

类型2

类型3

主控模块

接收模块

事务中心

发送模块

读入事务

分析事务

事务类型

处理模块1

处理模块2

处理模块3

（四）事务分析详解

步骤1：确定事务中心

在数据流图中，找到事务分发部分。

步骤2：识别事务类型

识别不同的事务类型。

步骤3：设计接收分支

设计事务接收模块，完成事务读入和分析。

步骤4：设计发送分支

设计事务分发模块，根据事务类型分发。

步骤5：设计处理分支

设计事务处理模块，完成各类事务处理。

📋 六、结构化设计方法的优化

（一）优化目标

优化目标：

（二）优化原则

优化原则：

（三）优化策略

优化策略：

（四）结构优化示例

优化前结构：

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主控模块

模块1

模块2

模块3

模块4

模块5

模块6

模块7

模块8

优化后结构：

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主控模块

子系统1

子系统2

子系统3

模块1

模块2

模块3

模块4

模块5

模块6

模块7

模块8

📝 七、结构化设计方法实例

（一）实例背景

项目：订单处理系统

系统功能：

• 接收订单
• 验证订单
• 处理订单
• 输出结果

（二）数据流图

数据流图：

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订单数据

读入订单

验证订单

处理订单

输出结果

处理结果

（三）变换分析

变换分析：

识别变换中心为"处理订单"。

结构图：

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主控模块

输入模块

变换模块

输出模块

读入订单

验证订单

处理订单

输出结果

写入文件

（四）详细设计

模块说明：

📝 总结

结构化设计方法是面向数据流的重要设计方法。

🎯 方法定义：将数据流图映射为软件结构，是概要设计阶段的重要设计方法。

📦 基本概念：

• 变换型数据流：线性流动，经过变换
• 事务型数据流：根据事务类型分发

🌐 设计步骤：分析数据流→确定数据流类型→变换分析/事务分析→设计初始结构→优化结构→编写文档。

💡 变换分析：

• 适用于变换型数据流
• 步骤：确定变换中心→设计顶层结构→设计输入分支→设计输出分支→设计变换分支

📋 事务分析：

• 适用于事务型数据流
• 步骤：确定事务中心→识别事务类型→设计接收分支→设计发送分支→设计处理分支

📊 设计优化：高内聚低耦合、模块规模适中、控制深度宽度、扇入扇出合理。

核心启示：结构化设计方法是软件设计的重要方法，"面向数据流"是其核心思想。在实际工作中，我们需要注意：第一，正确识别数据流类型，选择合适的设计方法；第二，严格遵循设计步骤，确保设计质量；第三，重视结构优化，提高模块独立性；第四，编写完整的设计文档，为后续开发提供依据。结构化设计方法虽然历史悠久，但其思想仍然具有重要价值，理解这种方法有助于我们更好地理解软件设计的本质。