lucene3.0 实例
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Lucene 是一个开源的全文检索库,由 Apache 软件基金会开发,它为 Java 开发人员提供了强大的文本搜索功能。在 Lucene 3.0 版本中,虽然已经相对较旧,但仍然包含了基本的搜索引擎功能,适用于简单或特定场景的搜索需求。在这个实例中,我们将探讨如何在 JDK 1.5 和 Lucene 3.0 的环境下构建和运行一个简单的搜索引擎。 Lucene 的核心概念包括文档(Document)、字段(Field)、索引(Index)和搜索(Search)。文档是存储信息的基本单位,可以类比为数据库中的记录,由多个字段组成。字段则定义了文档中的各个属性,比如标题、内容等,每个字段可以有不同的索引和存储策略。索引是 Lucene 的关键,它将文本数据转换为倒排索引,以便快速查找匹配查询的文档。搜索过程是基于查询对象进行的,用户输入查询字符串,Lucene 返回相关的文档列表。 在给定的实例中,有两个主要的类:一个是用于生成索引的类,另一个是用于执行搜索的类。生成索引的类通常会读取文件内容,创建 Lucene 文档,然后将这些文档添加到索引中。这个过程包括以下几个步骤: 1. 初始化索引目录:使用 `FSDirectory.open()` 创建指向索引存储位置的目录对象。 2. 创建索引writer:`IndexWriter` 类负责创建和更新索引,使用 `IndexWriterConfig` 进行配置。 3. 构建文档:为每个要索引的文件创建 `Document` 对象,然后添加字段,如 `Field("content", fileContent, TextField.TYPE_STORED)` 用于存储全文内容。 4. 添加文档到索引:使用 `IndexWriter.addDocument()` 方法将文档写入索引。 5. 关闭索引writer:确保所有更改都保存并释放资源。 搜索类则是从用户输入中创建查询对象,然后使用 `IndexSearcher` 执行查询,返回匹配的文档列表。主要步骤如下: 1. 打开索引目录:使用 `FSDirectory.open()` 创建目录对象,代表已构建的索引。 2. 创建 `IndexSearcher` 对象:`new IndexSearcher(Directory)`,用于执行搜索操作。 3. 构建查询:`QueryParser` 可以解析用户输入,生成 `Query` 对象,如 `Query query = new QueryParser("content", analyzer).parse(userInput);` 4. 执行搜索:`TopDocs topDocs = searcher.search(query, numResults);` 返回匹配的文档及其评分。 5. 获取结果:使用 `ScoreDoc` 和 `Document` 检索匹配文档的具体信息,并显示给用户。 6. 关闭 `IndexSearcher` 以释放资源。 在 JDK 1.5 中运行这个实例需要注意,因为较新的 Lucene 版本可能不再支持这个版本的 Java。此外,还需要确保你已经安装了 Lucene 3.0 库,并将其添加到项目的类路径中。 总结来说,Lucene 3.0 实例展示了如何在 Java 环境下构建一个简单的全文搜索引擎。通过生成索引和执行搜索,我们可以理解 Lucene 的核心工作原理,包括文档、字段、索引和搜索。尽管现代应用通常使用更新的 Lucene 版本,但这个实例仍然对了解搜索引擎的基本运作方式有很好的教学价值。
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- by19870714142012-08-17代码虽然没跑起来,但仍然对我来说仍然有很大参考价值,谢谢分享者
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