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技术控:自己动手写搜索引擎全流程PDF教程,打造一个属于自己的 Google

技术控:自己动手写搜索引擎全流程PDF教程,打造一个属于自己的 Google

Google 神话


1995 年,两个年轻的学生 Larry Page 和 Sergey Brin 在一点上达成了共识——从大量数
据检索信息是计算系统面临的最大的挑战之一。1996 年,他们创建了一个叫做 BackRub 的
搜索引擎。这个搜索引擎后来叫做 Google。1998 年,Page 和 Brin 在 Larry 的大学宿舍创立
Google 公司的第一个数据中心。2000 年,Google 开始成为全球最大的搜索引擎一直到现在。
2005 年,Google 股票市值超过 1000 亿美元。公司首次登陆华尔街时,“让世界更美好”便
是他们阐明的目标之一。


体验搜索引擎


你想起什么大脑没有记住的知识了吗?用搜索引擎吧。它往往不会让你失望。
事实上这正是 Google 的创始人设想的。“如果你想搜就能搜,几乎像拥有第二个大脑,
那就妙极了,”他说。就在 Brin (一直是两人中站在前台的那个)说在兴头上的时候,Page 在
不声不响地稍稍露面之后,便带着“共谋者般的微笑”溜出了房间。
但是不要感到 Google 已经完成所有的事情,没有什么事情留下来给我们做了。

下面是这本教程目录:

自己动手写搜索引擎........................................................................................1

第 1 章 了解搜索引擎.......................................................................................1

1.1Google神话.........................................................................1

1.2 体验搜索引擎........................................................................1

1.3 你也可以做搜索引擎.............................................................4

1.4 本章小结............................................................................4

第 2 章 遍历搜索引擎技术.................................................................................5

2.1   30 分钟实现的搜索引擎........................................................5

  • 2.1.1 准备工作环境(10 分钟)................................................5
  • 2.1.2 编写代码(15 分钟)......................................................6
  • 2.1.3 发布运行(5 分钟)......................................................9

2.2 搜索引擎基本技术.................................................................14

  • 2.2.1 网络蜘蛛........................................................................14
  • 2.2.2 全文索引结构..................................................................14
  • 2.2.3 Lucene 全文检索引擎.....................................................15
  • 2.2.4 Nutch 网络搜索软件.......................................................15
  • 2.2.5 用户界面....................................................................17

2.3 商业搜索引擎技术介绍..........................................................17

  • 2.3.1 通用搜索....................................................................17
  • 2.3.2 垂直搜索........................................................................18
  • 2.3.3 站内搜索........................................................................19
  • 2.3.4 桌面搜索........................................................................21

2.4 本章小结................................................................................21

第 3 章 获得海量数据.......................................................................................22

3.1 自己的网络蜘蛛......................................................................22

  • 3.1.1 BerkeleyDB 介绍............................................................27
  • 3.1.2 抓取网页............................................................................28
  • 3.1.3 MP3 抓取......................................................................29
  • 3.1.4 RSS 抓取.........................................................................30
  • 3.1.5 图片抓取...........................................................................33
  • 3.1.6 垂直行业抓取..................................................................34

3.2 抓取数据库中的内容...............................................................36

  • 3.2.1 建立数据视图...................................................................36
  • 3.2.2 JDBC 数据库连接.............................................................36
  • 3.2.3 增量抓取.........................................................................38

3.3 抓取本地硬盘上的文件............................................................38

  • 3.3.1 目录遍历...........................................................................38

3.4 本章小结............................................................................40

第 4 章 提取文档中的文本内容..........................................................................41

4.1 从 HTML 文件中提取文本 .....................................................41

  • 4.1.1 HtmlParser 介绍..............................................................49
  • 4.1.2 结构化信息提取..........................................................52
  • 4.1.3 网页去噪............................................................................58
  • 4.1.4 网页结构相似度计算.............................................................61
  • 4.1.5 正文提取的工具 FireBug......................................................62
  • 4.1.6 正文提取的工具 NekoHTML...............................................64
  • 4.1.7 正文提取............................................................................66

4.2 从非 HTML 文件中提取文本 ....................................................77

  • 4.2.1 TEXT 文件.........................................................................77
  • 4.2.2 PDF 文件 ............................................................................77
  • 4.2.3 Word 文件..........................................................................85
  • 4.2.4 Rtf 文件...........................................................................86
  • 4.2.5 Excel 文件....................................................................87
  • 4.2.6 PowerPoint 文件.............................................................88

4.3 流媒体内容提取......................................................................89

  • 4.3.1 音频流内容提取.................................................................89
  • 4.3.2 视频流内容提取..................................................................91

4.4 抓取限制应对方法....................................................................93

4.5 本章小结..................................................................................94

第 5 章 自然语言处理........................................................................................95

5.1 中文分词处理............................................................................95

  • 5.1.1 Lucene 中的中文分词.......................................................95
  • 5.1.2 Lietu 中文分词的使用 .......................................................96
  • 5.1.3 中文分词的原理...............................................................96
  • 5.1.4 查找词典算法...................................................................99
  • 5.1.5 最大概率分词方法........................................................102
  • 5.1.6 新词发现..........................................................................105
  • 5.1.7 隐马尔可夫模型..............................................................106

5.2 语法解析树............................................................................108

5.3 文档排重................................................................................108

5.4 中文关键词提取......................................................................110

  • 5.4.1 关键词提取的基本方法.................................................110
  • 5.4.2 关键词提取的设计........................................................ 111
  • 5.4.3 从网页提取关键词......................................................... 111

5.5 相关搜索............................................................................... 111

5.6 拼写检查........................................................................114

  • 5.6.1 英文拼写检查...................................................................114
  • 5.6.2 中文拼写检查...................................................................115

5.7 自动摘要.................................................................................120

  • 5.7.1 自动摘要技术...................................................................120
  • 5.7.2 自动摘要的设计................................................................120
  • 5.7.3 Lucene 中的动态摘要.................................................128

5.8 自动分类................................................................................128

  • 5.8.1 Classifier4J......................................................................129
  • 5.8.2 自动分类的接口定义..........................................................131
  • 5.8.3 自动分类的 SVM 方法实现.................................................132
  • 5.8.4 多级分类............................................................................132

5.9 自动聚类...........................................................................134

  • 5.9.1 聚类的定义....................................................................134
  • 5.9.2 K 均值聚类方法........................................................135
  • 5.9.3 K 均值实现......................................................................135

5.10 拼音转换................................................................................142

5.11 语义搜索................................................................................143

5.12 跨语言搜索............................................................................147

5.13 本章小结................................................................................148

第 6 章 创建索引库.......................................................................................149

6.1 设计索引库结构.....................................................................150

  • 6.1.1 理解 Lucene 的索引库结构.............................................150
  • 6.1.2 设计一个简单的索引库....................................................152

6.2 创建和维护索引库...................................................................153

  • 6.2.1 创建索引库.....................................................................153
  • 6.2.2 向索引库中添加索引文档.................................................153
  • 6.2.3 删除索引库中的索引文档................................................155
  • 6.2.4 更新索引库中的索引文档................................................155
  • 6.2.5 索引的合并......................................................................155
  • 6.2.6 索引的定时更新......................................................156
  • 6.2.7 索引的备份和恢复......................................................157
  • 6.2.8 修复索引............................................................158

6.3 读写并发控制...................................................................158

6.4 优化使用 Lucene...............................................................159

  • 6.4.1 索引优化.............................................................159
  • 6.4.2 查询优化....................................................................161
  • 6.4.3 实现时间加权排序.......................................................166
  • 6.4.4 实现字词混合索引....................................................167
  • 6.4.5 定制 Similarity........................................................173
  • 6.4.6 定制 Tokenizer........................................................174

6.5 查询大容量索引...................................................................176

6.6 本章小结.............................................................................177

第 7 章 用户界面设计与实现...........................................................................177

7.1 Lucene 搜索接口(search 代码)............................................178

7.2 搜索页面设计............................................................179

  • 7.2.1 用于显示搜索结果的 taglib........................................179
  • 7.2.2 用于搜索结果分页的 taglib..........................................181
  • 7.2.3 设计一个简单的搜索页面...............................................183

7.3 实现搜索接口.................................................................186

  • 7.3.1 布尔搜索...................................................................186
  • 7.3.2 指定范围搜索.......................................................186
  • 7.3.3 设置过滤条件.....................................错误!未定义书签
  • 7.3.4 搜索结果排序.........................................................191
  • 7.3.5 搜索页面的索引缓存与更新......................................192

7.4 实现关键词高亮显示...................................................194

7.5 实现多维视图........................................................196

7.6 实现相似文档搜索.............................................................202

7.7 实现 AJAX 自动完成 ..........................................................205

  • 7.7.1 总体结构..........................................................206
  • 7.7.2 服务器端处理.......................................................206
  • 7.7.3 浏览器端处理........................................................208
  • 7.7.4 服务器端改进........................................................209
  • 7.7.5 部署总结...................................................................219

7.8 jQuery 实现的自动完成....................................................219

7.9 集成其他功能................................................................225

  • 7.9.1 拼写检查.................................................................225
  • 7.9.2 分类统计...........................................................226
  • 7.9.3 相关搜索.................................................226
  • 7.9.4 再次查找................................................................229
  • 7.9.5 搜索日志.................................................................229

7.10 搜索日志分析...............................................................231

7.11 本章小结.........................................................................234

第 8 章 其他高级主题....................................................................................238

8.1 使用 Solr 实现分布式搜索..................................................235

  • 8.1.1 Solr 服务器端的配置与中文支持.............................235
  • 8.1.2 把数据放进 Solr.......................................................240
  • 8.1.3 删除数据..................................................................243
  • 8.1.4 客户端搜索界面........................................................244
  • 8.1.5 Solr 索引库的查找......................................................245
  • 8.1.6 索引分发................................................................249
  • 8.1.7 Solr 搜索优化..............................................................249
  • 8.1.8 Solr 中字词混合索引..................................................252
  • 8.1.9 相关检索...................................................................256
  • 8.1.10 搜索结果去重...........................................................258
  • 8.1.11 分布式搜索...............................................................263
  • 8.1.12 SolrJ 查询分析器........................................................267
  • 8.1.13 扩展 SolrJ ...................................................................279
  • 8.1.14 扩展 Solr..................................................................280
  • 8.1.15 Solr 的.net 客户端...................................................288
  • 8.1.16 Solr 的 php 客户端..............................................289

8.2 图片搜索.........................................................................294

  • 8.2.1 图像的 OCR 识别.......................................................295

8.3 竞价排名...........................................................................299

8.4 Web 图分析 .....................................................................300

8.5 使用并行程序分析数据...................................................305

8.6 RSS 搜索 .............................................................................306

8.7 本章小结.........................................................................307

参考资源.........................................................................308

  • 书籍....................................................................................308
  • 网址........................................................................................308

本书中的章节和代码对照表309

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  1. CONNECT:[ UseTime:0.003593s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.028825s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.133224s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.145039s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001041s ]
  6. SELECT * FROM `set` [ RunTime:0.000360s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000853s ]
  8. SELECT * FROM `article` WHERE `id` = 556255 LIMIT 1 [ RunTime:0.000681s ]
  9. UPDATE `article` SET `lasttime` = 1776838865 WHERE `id` = 556255 [ RunTime:0.033312s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.139647s ]
  11. SELECT * FROM `article` WHERE `id` < 556255 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.067955s ]
  12. SELECT * FROM `article` WHERE `id` > 556255 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.018068s ]
  13. SELECT * FROM `article` WHERE `id` < 556255 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001181s ]
  14. SELECT * FROM `article` WHERE `id` < 556255 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001155s ]
  15. SELECT * FROM `article` WHERE `id` < 556255 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001669s ]
0.931283s