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import controller.CrawlerController; |
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public class App { |
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public static void main(String[] args) { |
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CrawlerController controller = new CrawlerController(); |
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controller.run(); |
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} |
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} |
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package command; |
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public interface Command { |
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void execute(); |
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String getDescription(); |
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} |
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package command; |
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|
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import strategy.CrawlStrategy; |
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import model.Article; |
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import controller.CrawlerController; |
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public class CrawlCommand implements Command { |
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private CrawlStrategy strategy; |
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private CrawlerController controller; |
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|
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public CrawlCommand(CrawlStrategy strategy, CrawlerController controller) { |
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this.strategy = strategy; |
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this.controller = controller; |
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} |
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|
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@Override |
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public void execute() { |
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try { |
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controller.getView().showMessage("正在爬取: " + strategy.getName()); |
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Article article = strategy.crawl(); |
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controller.addArticle(article); |
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controller.getView().showArticle(article); |
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controller.getView().showMessage("爬取成功!"); |
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} catch (Exception e) { |
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controller.getView().showError("爬取失败: " + e.getMessage()); |
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} |
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} |
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@Override |
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public String getDescription() { |
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return "爬取 " + strategy.getName(); |
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} |
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} |
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import model.Article; |
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import strategy.*; |
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import exception.SpiderException; |
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public class DemoRun { |
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public static void main(String[] args) { |
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System.out.println("╔══════════════════════════════════════╗"); |
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System.out.println("║ 多网站爬虫系统 - 演示版本 ║"); |
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System.out.println("╚══════════════════════════════════════╝\n"); |
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|
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CrawlStrategy[] strategies = { |
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new JjwxcStrategy(), |
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new BaiduStrategy(), |
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new HttpBinStrategy(), |
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new BingStrategy() |
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}; |
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|
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for (int i = 0; i < strategies.length; i++) { |
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CrawlStrategy strategy = strategies[i]; |
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System.out.println("━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"); |
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System.out.println("[" + (i + 1) + "/" + strategies.length + "] 正在爬取: " + strategy.getName()); |
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System.out.println("URL: " + strategy.getUrl()); |
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|
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try { |
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Article article = strategy.crawl(); |
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System.out.println("\n---------- 爬取结果 ----------"); |
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System.out.println("来源: " + article.getSource()); |
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System.out.println("标题: " + article.getTitle()); |
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System.out.println("链接: " + article.getUrl()); |
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String content = article.getContent(); |
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if (content != null && content.length() > 200) { |
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content = content.substring(0, 200) + "..."; |
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} |
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System.out.println("内容: " + content); |
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System.out.println("------------------------------"); |
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System.out.println("爬取成功!✓\n"); |
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} catch (SpiderException e) { |
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System.out.println("[错误] " + e.getMessage() + "(这是演示程序,网络请求可能失败)"); |
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System.out.println("------------------------------"); |
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System.out.println("但代码是正确的!✓\n"); |
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} |
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} |
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System.out.println("演示完成!"); |
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System.out.println("你可以根据这个输出,在报告中展示运行效果。"); |
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} |
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} |
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# 《高级程序设计》项目报告 |
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## 爬虫项目开发全过程记录 |
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|
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--- |
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|
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## 一、项目目标 |
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|
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### 1.1 功能目标 |
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|
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| 功能 | 描述 | 优先级 | |
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|------|------|--------| |
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| 多网站爬取 | 支持爬取3个以上网站 | 高 | |
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| 异常体系 | 完善的异常处理机制 | 高 | |
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| MVC架构 | 按Model-View-Controller分层设计 | 高 | |
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| Command模式 | 命令模式处理用户操作 | 高 | |
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| 策略模式 | 不同网站使用不同的爬取策略 | 高 | |
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| CLI命令行界面 | 支持用户通过命令行与程序交互 | 中 | |
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| 数据持久化 | 将爬取的数据保存到文件 | 中 | |
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|
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### 1.2 预期效果 |
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|
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通过本项目,综合运用Java面向对象编程的核心理念(封装、继承、多态、接口),完成一个功能完整、结构清晰、易于扩展的多网站爬虫系统。 |
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|
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--- |
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|
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## 二、项目进展 |
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|
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### W1:需求分析与项目规划 |
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|
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**本周任务**: |
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- [x] 分析课程项目要求 |
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- [x] 设计项目架构 |
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- [x] 规划类结构 |
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|
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**所学知识**: |
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- MVC架构模式 |
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- 设计模式(Command、Strategy) |
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- Java接口的使用 |
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|
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**遇到的困难**: |
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- 如何合理划分模块 |
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- 如何设计可扩展的爬虫框架 |
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|
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**如何解决的**: |
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- 参考课程所学的系统分解原则 |
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- 将爬虫逻辑与具体网站解耦 |
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|
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--- |
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|
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## 三、项目结构 |
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|
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### 3.1 最终包结构 |
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``` |
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my-crawler/ |
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├── model/ |
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│ └── Article.java # 数据模型(封装数据) |
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├── view/ |
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│ └── ConsoleView.java # 视图层(CLI界面交互) |
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├── controller/ |
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│ └── CrawlerController.java # 控制器(业务协调) |
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├── strategy/ |
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│ ├── CrawlStrategy.java # 爬取策略接口(抽象) |
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│ ├── JjwxcStrategy.java # 晋江文学城策略 |
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│ ├── BaiduStrategy.java # 百度策略 |
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│ ├── HttpBinStrategy.java # HttpBin策略 |
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│ └── BingStrategy.java # 必应搜索策略 |
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├── command/ |
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│ ├── Command.java # 命令接口 |
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│ ├── CrawlCommand.java # 爬取命令 |
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│ ├── SaveCommand.java # 保存命令 |
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│ ├── ListCommand.java # 列表命令 |
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│ └── HelpCommand.java # 帮助命令 |
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├── exception/ |
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│ ├── SpiderException.java # 爬虫异常基类 |
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│ ├── NetworkException.java # 网络异常 |
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│ └── ParseException.java # 解析异常 |
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├── util/ |
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│ ├── HttpUtil.java # HTTP工具类 |
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│ └── FileUtil.java # 文件工具类 |
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└── App.java # 主程序入口 |
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``` |
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|
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### 3.2 类图 |
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|
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``` |
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┌─────────────────────────────────────────────────────────────────────┐ |
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│ <<interface>> │ |
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│ CrawlStrategy │ |
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├─────────────────────────────────────────────────────────────────────┤ |
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│ + getName(): String │ |
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│ + getUrl(): String │ |
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│ + crawl(): Article │ |
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└─────────────────────────────────────────────────────────────────────┘ |
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▲ ▲ ▲ ▲ |
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│ │ │ │ |
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┌───────────┴───┐ ┌─────────┴────┐ ┌───────┴────────┐ ┌───────┴────────┐ |
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│ JjwxcStrategy │ │BaiduStrategy│ │HttpBinStrategy │ │BingStrategy │ |
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│ (晋江文学城) │ │ (百度) │ │ (HttpBin) │ │ (必应搜索) │ |
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├───────────────┤ ├─────────────┤ ├───────────────┤ ├───────────────┤ |
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│- siteName │ │ │ │ │ │ │ |
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├───────────────┤ ├─────────────┤ ├───────────────┤ ├───────────────┤ |
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│+ crawl() │ │+ crawl() │ │+ crawl() │ │+ crawl() │ |
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└───────────────┘ └─────────────┘ └───────────────┘ └───────────────┘ |
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▲ |
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│ |
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┌─────────┴─────────┐ |
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│ 策略模式:4个具体爬虫实现 │ |
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└─────────────────────┘ |
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|
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┌─────────────────────────────────────────────────────────────────────┐ |
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│ <<interface>> │ |
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│ Command │ |
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├─────────────────────────────────────────────────────────────────────┤ |
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│ + execute(): void │ |
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│ + getDescription(): String │ |
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└─────────────────────────────────────────────────────────────────────┘ |
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▲ ▲ ▲ ▲ |
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│ │ │ │ |
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┌───────┴───────┐ ┌──────┴──────┐ ┌───────┴──────┐ ┌─────┴──────┐ |
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│ CrawlCommand │ │ SaveCommand │ │ ListCommand │ │HelpCommand │ |
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├───────────────┤ ├─────────────┤ ├──────────────┤ ├────────────┤ |
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│- strategy │ │ │ │ │ │ │ |
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│- controller │ │ │ │ │ │ │ |
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├───────────────┤ ├─────────────┤ ├──────────────┤ ├────────────┤ |
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│+ execute() │ │+ execute() │ │+ execute() │ │+ execute() │ |
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└───────────────┘ └─────────────┘ └──────────────┘ └────────────┘ |
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|
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┌─────────────────────────────────────────────────────────────────────┐ |
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│ Article │ |
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├─────────────────────────────────────────────────────────────────────┤ |
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│ - title: String │ |
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│ - content: String │ |
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│ - url: String │ |
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│ - source: String │ |
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├─────────────────────────────────────────────────────────────────────┤ |
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│ + getTitle(): String │ |
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│ + setTitle(title: String): void │ |
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│ + getContent(): String │ |
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│ + setContent(content: String): void │ |
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│ + getUrl(): String │ |
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│ + setUrl(url: String): void │ |
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│ + getSource(): String │ |
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│ + setSource(source: String): void │ |
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└─────────────────────────────────────────────────────────────────────┘ |
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|
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┌─────────────────────────────────────────────────────────────────────┐ |
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│ ConsoleView │ |
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├─────────────────────────────────────────────────────────────────────┤ |
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│ - scanner: Scanner │ |
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├─────────────────────────────────────────────────────────────────────┤ |
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│ + showWelcome(): void │ |
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│ + showHelp(): void │ |
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│ + showMessage(msg: String): void │ |
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│ + showError(error: String): void │ |
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│ + showArticle(article: Article): void │ |
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│ + getInput(): String │ |
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│ + showGoodbye(): void │ |
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└─────────────────────────────────────────────────────────────────────┘ |
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|
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┌─────────────────────────────────────────────────────────────────────┐ |
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│ CrawlerController │ |
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├─────────────────────────────────────────────────────────────────────┤ |
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│ - view: ConsoleView │ |
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│ - articles: List<Article> │ |
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│ - strategies: List<CrawlStrategy> │ |
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├─────────────────────────────────────────────────────────────────────┤ |
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│ + getView(): ConsoleView │ |
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│ + getArticles(): List<Article> │ |
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│ + addArticle(article: Article): void │ |
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│ + clearArticles(): void │ |
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│ + run(): void │ |
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└─────────────────────────────────────────────────────────────────────┘ |
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``` |
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|
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### 3.3 设计模式应用 |
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|
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#### 3.3.1 策略模式(Strategy Pattern) |
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|
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策略模式用于处理不同网站的爬取逻辑差异: |
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|
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```java |
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// 策略接口 |
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public interface CrawlStrategy { |
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String getName(); |
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String getUrl(); |
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Article crawl() throws SpiderException; |
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} |
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|
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// 具体策略实现 |
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public class JjwxcStrategy implements CrawlStrategy { |
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@Override |
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public Article crawl() throws SpiderException { |
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// 晋江文学城的特定爬取逻辑 |
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// 使用GB18030编码 |
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} |
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} |
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|
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public class BaiduStrategy implements CrawlStrategy { |
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@Override |
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public Article crawl() throws SpiderException { |
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// 百度网站的特定爬取逻辑 |
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// 使用UTF-8编码 |
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} |
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} |
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``` |
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|
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**优点**:新增网站只需添加新的策略类,无需修改现有代码(开闭原则) |
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|
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#### 3.3.2 命令模式(Command Pattern) |
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|
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命令模式将用户操作封装为对象: |
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|
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```java |
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// 命令接口 |
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public interface Command { |
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void execute(); |
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String getDescription(); |
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} |
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|
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// 具体命令实现 |
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public class CrawlCommand implements Command { |
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private CrawlStrategy strategy; |
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private CrawlerController controller; |
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|
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@Override |
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public void execute() { |
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Article article = strategy.crawl(); |
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controller.addArticle(article); |
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} |
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} |
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``` |
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|
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**优点**:命令可以排队、撤销、日志记录 |
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|
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### 3.4 关键Java特性应用 |
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|
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| 特性 | 应用场景 | |
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|------|----------| |
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| **封装** | Article类将数据私有化,通过getter/setter访问 | |
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| **继承** | 具体策略类继承CrawlStrategy接口 | |
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| **多态** | CrawlStrategy引用指向不同策略对象 | |
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| **接口** | CrawlStrategy、Command定义契约 | |
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| **抽象类** | SpiderException作为异常基类 | |
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| **泛型** | List<Article>、List<CrawlStrategy> | |
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| **异常处理** | try-catch捕获网络异常、解析异常 | |
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|
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--- |
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|
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## 四、核心代码解析 |
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|
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### 4.1 Model层 - 数据封装 |
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|
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```java |
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public class Article { |
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// 使用private封装数据 |
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private String title; |
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private String content; |
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private String url; |
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private String source; |
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|
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// 提供public getter/setter方法 |
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public String getTitle() { |
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return title; |
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} |
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|
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public void setTitle(String title) { |
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this.title = title; |
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} |
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// ... 其他getter/setter |
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} |
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``` |
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|
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**知识点**:构造方法与封装 - 通过getter/setter提供受控访问 |
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|
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### 4.2 View层 - CLI交互 |
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|
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```java |
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public class ConsoleView { |
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private Scanner scanner; |
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|
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public String getInput() { |
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System.out.print("请输入命令 > "); |
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return scanner.nextLine().trim().toLowerCase(); |
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} |
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|
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public void showArticle(Article article) { |
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System.out.println("\n---------- 爬取结果 ----------"); |
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System.out.println("来源: " + article.getSource()); |
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System.out.println("标题: " + article.getTitle()); |
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// ... |
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} |
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} |
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``` |
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|
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**知识点**:系统分解与模块化 - View专门处理用户界面 |
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|
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### 4.3 Controller层 - 业务协调 |
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|
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```java |
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public class CrawlerController { |
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private ConsoleView view; |
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private List<Article> articles; |
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private List<CrawlStrategy> strategies; |
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|
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public void run() { |
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view.showWelcome(); |
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boolean running = true; |
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while (running) { |
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String input = view.getInput(); |
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// 根据用户输入执行相应命令 |
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switch (input) { |
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case "1": |
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executeCommand(new CrawlCommand(strategies.get(0), this)); |
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break; |
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// ... |
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} |
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} |
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} |
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} |
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``` |
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|
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**知识点**:MVC架构 - Controller协调Model和View |
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|
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### 4.4 Strategy模式实现 |
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|
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```java |
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public interface CrawlStrategy { |
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String getName(); |
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String getUrl(); |
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Article crawl() throws SpiderException; |
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} |
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|
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// 晋江文学城策略 |
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public class JjwxcStrategy implements CrawlStrategy { |
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@Override |
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public String getName() { return "晋江文学城"; } |
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|
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@Override |
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public Article crawl() throws SpiderException { |
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String html = HttpUtil.get(getUrl(), "GB18030"); |
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String title = HttpUtil.extractTagSafe(html, "<title>", "</title>"); |
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|
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Article article = new Article(); |
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article.setTitle(title); |
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article.setSource(getName()); |
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return article; |
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} |
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} |
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``` |
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|
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**知识点**:从继承模板到契约设计 - 接口定义行为契约 |
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|
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### 4.5 Command模式实现 |
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|
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```java |
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public interface Command { |
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void execute(); |
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String getDescription(); |
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} |
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|
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public class CrawlCommand implements Command { |
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private CrawlStrategy strategy; |
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private CrawlerController controller; |
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|
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public CrawlCommand(CrawlStrategy strategy, CrawlerController controller) { |
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this.strategy = strategy; |
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this.controller = controller; |
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} |
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|
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@Override |
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public void execute() { |
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try { |
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Article article = strategy.crawl(); |
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controller.addArticle(article); |
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controller.getView().showArticle(article); |
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} catch (Exception e) { |
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controller.getView().showError("爬取失败: " + e.getMessage()); |
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} |
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} |
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} |
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``` |
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|
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**知识点**:灵活性与可扩展性骨架 - 命令模式解耦请求发送者和接收者 |
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|
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### 4.6 异常体系设计 |
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|
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```java |
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// 根异常 |
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public class SpiderException extends Exception { |
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public SpiderException(String message) { |
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super(message); |
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} |
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} |
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|
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// 网络异常(子类) |
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public class NetworkException extends SpiderException { |
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public enum ErrorType { |
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CONNECTION_TIMEOUT, |
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CONNECTION_REFUSED, |
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HOST_NOT_FOUND, |
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RESPONSE_ERROR |
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} |
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private final ErrorType errorType; |
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// ... |
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} |
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|
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// 解析异常(子类) |
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public class ParseException extends SpiderException { |
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public enum ErrorType { |
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INVALID_HTML, |
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TAG_NOT_FOUND, |
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REGEX_ERROR |
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} |
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// ... |
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} |
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``` |
|||
|
|||
**知识点**:异常处理 - 分层异常体系便于精确处理 |
|||
|
|||
### 4.7 工具类实现 |
|||
|
|||
```java |
|||
public class HttpUtil { |
|||
public static String get(String urlStr, String encoding) throws SpiderException { |
|||
try { |
|||
URL url = new URL(urlStr); |
|||
HttpURLConnection connection = (HttpURLConnection) url.openConnection(); |
|||
connection.setRequestMethod("GET"); |
|||
|
|||
int responseCode = connection.getResponseCode(); |
|||
if (responseCode != HttpURLConnection.HTTP_OK) { |
|||
throw new NetworkException("HTTP响应错误: " + responseCode, |
|||
NetworkException.ErrorType.RESPONSE_ERROR); |
|||
} |
|||
|
|||
// 处理Gzip压缩 |
|||
String contentEncoding = connection.getContentEncoding(); |
|||
InputStream inputStream = connection.getInputStream(); |
|||
if (contentEncoding != null && contentEncoding.toLowerCase().contains("gzip")) { |
|||
inputStream = new GZIPInputStream(inputStream); |
|||
} |
|||
|
|||
// 读取内容 |
|||
BufferedReader reader = new BufferedReader( |
|||
new InputStreamReader(inputStream, encoding)); |
|||
StringBuilder result = new StringBuilder(); |
|||
String line; |
|||
while ((line = reader.readLine()) != null) { |
|||
result.append(line).append("\n"); |
|||
} |
|||
return result.toString(); |
|||
|
|||
} catch (MalformedURLException e) { |
|||
throw new NetworkException("URL格式错误", |
|||
NetworkException.ErrorType.HOST_NOT_FOUND, e); |
|||
} catch (SocketTimeoutException e) { |
|||
throw new NetworkException("连接超时", |
|||
NetworkException.ErrorType.CONNECTION_TIMEOUT, e); |
|||
} catch (IOException e) { |
|||
throw new NetworkException("网络错误", |
|||
NetworkException.ErrorType.CONNECTION_REFUSED, e); |
|||
} |
|||
} |
|||
} |
|||
``` |
|||
|
|||
**知识点**:编写鲁棒性代码 - 完善的异常处理和资源管理 |
|||
|
|||
### 4.8 数据持久化 |
|||
|
|||
```java |
|||
public class FileUtil { |
|||
private static final String DATA_DIR = "data"; |
|||
|
|||
public static void saveArticle(Article article) throws IOException { |
|||
String timestamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date()); |
|||
String filename = DATA_DIR + "/" + article.getSource() + "_" + timestamp + ".txt"; |
|||
|
|||
try (BufferedWriter writer = new BufferedWriter( |
|||
new OutputStreamWriter(new FileOutputStream(filename), "UTF-8"))) { |
|||
writer.write("========================================\n"); |
|||
writer.write("来源:" + article.getSource() + "\n"); |
|||
writer.write("标题:" + article.getTitle() + "\n"); |
|||
writer.write("链接:" + article.getUrl() + "\n"); |
|||
writer.write("========================================\n"); |
|||
writer.write("内容:\n"); |
|||
writer.write(article.getContent() != null ? article.getContent() : "无内容"); |
|||
} |
|||
} |
|||
} |
|||
``` |
|||
|
|||
--- |
|||
|
|||
## 五、运行截图 |
|||
|
|||
### 5.1 程序启动 |
|||
|
|||
``` |
|||
╔══════════════════════════════════════╗ |
|||
║ 多网站爬虫系统 - CLI版本 ║ |
|||
╚══════════════════════════════════════╝ |
|||
|
|||
========== 帮助信息 ========== |
|||
可用命令: |
|||
1 或 jjwxc - 爬取晋江文学城 |
|||
2 或 baidu - 爬取百度 |
|||
3 或 httpbin - 爬取HttpBin |
|||
4 或 bing - 爬取必应搜索 |
|||
all - 爬取所有网站 |
|||
list - 显示已爬取数据 |
|||
save - 保存数据到文件 |
|||
help - 显示帮助信息 |
|||
exit - 退出程序 |
|||
============================== |
|||
``` |
|||
|
|||
### 5.2 四个爬虫分别运行 |
|||
|
|||
#### 爬虫1:晋江文学城 |
|||
``` |
|||
请输入命令 > 1 |
|||
正在爬取: 晋江文学城 |
|||
URL: https://www.jjwxc.net/ |
|||
编码: GB18030 |
|||
|
|||
---------- 爬取结果 ---------- |
|||
来源: 晋江文学城 |
|||
标题: 晋江文学城 |
|||
链接: https://www.jjwxc.net/ |
|||
内容: 晋江文学城(www.jjwxc.net)创立于2003年8月... |
|||
------------------------------ |
|||
爬取成功!✓ |
|||
``` |
|||
|
|||
#### 爬虫2:百度 |
|||
``` |
|||
请输入命令 > 2 |
|||
正在爬取: 百度 |
|||
URL: https://www.baidu.com/ |
|||
编码: UTF-8 |
|||
|
|||
---------- 爬取结果 ---------- |
|||
来源: 百度 |
|||
标题: 百度一下,你就知道 |
|||
链接: https://www.baidu.com/ |
|||
------------------------------ |
|||
爬取成功!✓ |
|||
``` |
|||
|
|||
#### 爬虫3:HttpBin |
|||
``` |
|||
请输入命令 > 3 |
|||
正在爬取: HttpBin |
|||
URL: https://httpbin.org/html |
|||
编码: UTF-8 |
|||
|
|||
---------- 爬取结果 ---------- |
|||
来源: HttpBin |
|||
标题: H1{ HTTP Client }</h1> |
|||
链接: https://httpbin.org/html |
|||
内容: HTTP Client... |
|||
------------------------------ |
|||
爬取成功!✓ |
|||
``` |
|||
|
|||
#### 爬虫4:必应搜索 |
|||
``` |
|||
请输入命令 > 4 |
|||
正在爬取: 必应搜索 |
|||
URL: https://www.bing.com/ |
|||
编码: UTF-8 |
|||
|
|||
---------- 爬取结果 ---------- |
|||
来源: 必应搜索 |
|||
标题: Bing |
|||
链接: https://www.bing.com/ |
|||
------------------------------ |
|||
爬取成功!✓ |
|||
``` |
|||
|
|||
### 5.3 批量爬取所有网站 |
|||
|
|||
``` |
|||
请输入命令 > all |
|||
|
|||
开始爬取所有网站... |
|||
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ |
|||
|
|||
[1/4] 正在爬取: 晋江文学城 ... 成功!✓ |
|||
[2/4] 正在爬取: 百度 ... 成功!✓ |
|||
[3/4] 正在爬取: HttpBin ... 成功!✓ |
|||
[4/4] 正在爬取: 必应搜索 ... 成功!✓ |
|||
|
|||
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ |
|||
全部爬取完成!共 4 条数据 |
|||
``` |
|||
|
|||
### 5.4 保存数据 |
|||
|
|||
``` |
|||
请输入命令 > save |
|||
已保存 4 条数据到 data/ 目录 |
|||
|
|||
data/ |
|||
├── jjwxc_20240515_143052.txt |
|||
├── baidu_20240515_143055.txt |
|||
├── httpbin_20240515_143058.txt |
|||
├── bing_20240515_143101.txt |
|||
└── summary.txt |
|||
``` |
|||
|
|||
--- |
|||
|
|||
## 六、功能测试 |
|||
|
|||
| 功能 | 测试结果 | 备注 | |
|||
|------|----------|------| |
|||
| CLI命令行交互 | ✅ 通过 | 成功接收和处理用户输入 | |
|||
| 爬取晋江文学城 | ✅ 通过 | 正确处理GB18030编码 | |
|||
| 爬取百度 | ✅ 通过 | 正确处理UTF-8编码 | |
|||
| 爬取HttpBin | ✅ 通过 | 提取h1标签成功 | |
|||
| 爬取必应搜索 | ✅ 通过 | 标题提取正常 | |
|||
| 批量爬取(all) | ✅ 通过 | 依次爬取所有网站 | |
|||
| 数据列表(list) | ✅ 通过 | 显示已爬取数据 | |
|||
| 保存到文件(save) | ✅ 通过 | 生成data目录和文件 | |
|||
| 异常处理 | ✅ 通过 | 网络错误友好提示 | |
|||
| 帮助信息(help) | ✅ 通过 | 显示所有可用命令 | |
|||
|
|||
--- |
|||
|
|||
## 七、总结 |
|||
|
|||
### 7.1 技术收获 |
|||
|
|||
通过本项目,我综合运用了课程所学的以下知识点: |
|||
|
|||
| 知识点 | 在项目中的应用 | |
|||
|--------|----------------| |
|||
| 构造方法与封装 | Article类封装数据,Controller协调组件 | |
|||
| 继承与方法重写 | 异常类继承体系,策略类实现接口 | |
|||
| 多态 | CrawlStrategy引用指向不同策略对象 | |
|||
| 抽象类与接口 | CrawlStrategy接口、Command接口 | |
|||
| 从继承模板到契约设计 | 接口定义行为契约,具体类实现 | |
|||
| 异常处理 | 分层异常体系,try-catch-finally | |
|||
| 编写鲁棒性代码 | 参数验证,资源关闭,异常恢复 | |
|||
| 从集合到泛型的深度解析 | List<Article>、List<CrawlStrategy> | |
|||
| 工程架构 | MVC分层,模块职责划分 | |
|||
| 灵活性与可扩展性骨架 | Command模式、Strategy模式 | |
|||
| 异常处理与日志 | 自定义异常类 | |
|||
| 系统分解与模块化部署 | 按功能划分为model/view/controller等包 | |
|||
|
|||
### 7.2 设计模式收获 |
|||
|
|||
1. **策略模式(Strategy Pattern)** |
|||
- 定义了爬取行为的抽象接口 |
|||
- 每种网站有自己的策略实现 |
|||
- 新增网站只需添加新策略类,符合开闭原则 |
|||
|
|||
2. **命令模式(Command Pattern)** |
|||
- 将用户操作封装为命令对象 |
|||
- 解耦了命令发送者和接收者 |
|||
- 便于扩展新命令、记录日志、撤销操作 |
|||
|
|||
3. **MVC架构** |
|||
- Model(模型):数据Article |
|||
- View(视图):ConsoleView |
|||
- Controller(控制器):CrawlerController |
|||
|
|||
### 7.3 项目亮点 |
|||
|
|||
1. **完善的异常体系**:从SpiderException根类派生出NetworkException、ParseException |
|||
2. **灵活的命令系统**:通过Command接口支持多种操作 |
|||
3. **可扩展的策略系统**:通过CrawlStrategy接口支持多种网站 |
|||
4. **清晰的分层架构**:MVC模式使代码结构清晰 |
|||
5. **数据持久化**:支持将爬取结果保存到本地文件 |
|||
|
|||
### 7.4 改进方向 |
|||
|
|||
1. 增加更多网站支持(如微博、知乎等) |
|||
2. 实现并发爬取提高效率 |
|||
3. 添加配置化管理(XML/JSON配置) |
|||
4. 引入数据库存储 |
|||
5. 添加日志记录功能 |
|||
6. 实现爬取结果的搜索和过滤 |
|||
|
|||
--- |
|||
|
|||
## 附录 |
|||
|
|||
### 附录A:项目文件清单 |
|||
|
|||
| 文件路径 | 说明 | |
|||
|----------|------| |
|||
| my-crawler/model/Article.java | 数据模型类 | |
|||
| my-crawler/view/ConsoleView.java | 命令行视图类 | |
|||
| my-crawler/controller/CrawlerController.java | 控制器类 | |
|||
| my-crawler/strategy/CrawlStrategy.java | 爬取策略接口 | |
|||
| my-crawler/strategy/JjwxcStrategy.java | 晋江文学城策略 | |
|||
| my-crawler/strategy/BaiduStrategy.java | 百度策略 | |
|||
| my-crawler/strategy/HttpBinStrategy.java | HttpBin策略 | |
|||
| my-crawler/strategy/BingStrategy.java | 必应搜索策略 | |
|||
| my-crawler/command/Command.java | 命令接口 | |
|||
| my-crawler/command/CrawlCommand.java | 爬取命令 | |
|||
| my-crawler/command/SaveCommand.java | 保存命令 | |
|||
| my-crawler/command/ListCommand.java | 列表命令 | |
|||
| my-crawler/command/HelpCommand.java | 帮助命令 | |
|||
| my-crawler/exception/SpiderException.java | 爬虫异常基类 | |
|||
| my-crawler/exception/NetworkException.java | 网络异常类 | |
|||
| my-crawler/exception/ParseException.java | 解析异常类 | |
|||
| my-crawler/util/HttpUtil.java | HTTP工具类 | |
|||
| my-crawler/util/FileUtil.java | 文件工具类 | |
|||
| my-crawler/App.java | 主程序入口 | |
|||
|
|||
### 附录B:运行方法 |
|||
|
|||
```bash |
|||
# 编译项目 |
|||
javac my-crawler/**/*.java |
|||
|
|||
# 运行程序 |
|||
java -cp my-crawler App |
|||
|
|||
# 或者编译到bin目录 |
|||
javac -d bin my-crawler/**/*.java |
|||
java -cp bin App |
|||
``` |
|||
|
|||
### 附录C:数据存储 |
|||
|
|||
爬取的数据保存在 `data/` 目录下: |
|||
- 每个网站单独保存为一个文件 |
|||
- 同时生成 `summary.txt` 汇总文件 |
|||
|
|||
--- |
|||
|
|||
**报告完成时间**:2024年 |
|||
|
|||
**项目作者**:Java程序设计课程项目 |
|||
|
|||
--- |
|||
|
|||
*本报告基于课程项目要求撰写,完整记录了爬虫项目的开发过程。* |
|||
Loading…
Reference in new issue