Lucene-2.0学习文档（２）

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接http://www.javaeye.com/post/190334 IndexWriter(File path, Analyzer a, boolean create) IndexWriter(String path, Analyzer a, boolean create) 可见构造它需要一个索引文件目录，一个分析器(一般用标准的这个)，最后一个参数是标识是否清空索引目录它有一些设置参数的功能如：设置Field的最大长度看个例子： [code] public void IndexMaxField() throws IOException { IndexWriter indexWriter= new IndexWriter("c://index",new StandardAnalyzer(),true); Document doc1 = new Document(); doc1.add(new Field("name1","程序员之家",Field.Store.YES,Field.Index.TOKENIZED)); Document doc2 = new Document(); doc2.add(new Field("name2","Welcome to the Home of programers",Field.Store.YES,Field.Index.TOKENIZED)); indexWriter.setMaxFieldLength(5); indexWriter.addDocument(doc1); indexWriter.setMaxFieldLength(3); indexWriter.addDocument(doc1); indexWriter.setMaxFieldLength(0); indexWriter.addDocument(doc2); indexWriter.setMaxFieldLength(3); indexWriter.addDocument(doc2); indexWriter.close(); } public void SearcherMaxField() throws ParseException, IOException { Query query = null; Hits hits = null; IndexSearcher indexSearcher= null; QueryParser queryParser= null; queryParser = new QueryParser("name1",new StandardAnalyzer()); query = queryParser.parse("程序员"); indexSearcher= new IndexSearcher("c://index"); hits = indexSearcher.search(query); System.out.println("您搜的是：程序员"); System.out.println("找到了"+hits.length()+"个结果"); System.out.println("它们分别是："); for (int i = 0; i < hits.length(); i++) { Document doc = hits.doc(i); System.out.println(doc.get("name1")); } query = queryParser.parse("程序员之家"); indexSearcher= new IndexSearcher("c://index"); hits = indexSearcher.search(query); System.out.println("您搜的是：程序员之家"); System.out.println("找到了"+hits.length()+"个结果"); System.out.println("它们分别是："); for (int i = 0; i < hits.length(); i++) { Document doc = hits.doc(i); System.out.println(doc.get("name1")); } queryParser = new QueryParser("name2",new StandardAnalyzer()); query = queryParser.parse("Welcome"); indexSearcher= new IndexSearcher("c://index"); hits = indexSearcher.search(query); System.out.println("您搜的是：Welcome"); System.out.println("找到了"+hits.length()+"个结果"); System.out.println("它们分别是："); for (int i = 0; i < hits.length(); i++) { Document doc = hits.doc(i); System.out.println(doc.get("name2")); } query = queryParser.parse("the"); indexSearcher= new IndexSearcher("c://index"); hits = indexSearcher.search(query); System.out.println("您搜的是：the"); System.out.println("找到了"+hits.length()+"个结果"); System.out.println("它们分别是："); for (int i = 0; i < hits.length(); i++) { Document doc = hits.doc(i); System.out.println(doc.get("name2")); } query = queryParser.parse("home"); indexSearcher= new IndexSearcher("c://index"); hits = indexSearcher.search(query); System.out.println("您搜的是：home"); System.out.println("找到了"+hits.length()+"个结果"); System.out.println("它们分别是："); for (int i = 0; i < hits.length(); i++) { Document doc = hits.doc(i); System.out.println(doc.get("name2")); } } [/code] 它的运行结果为: 总结一下： 1.设置Field的长度限制只是限制了搜索。如果用了Field.Store.YES的话还是会全部被保存进索引目录里的。 2.为什么搜the没有搜出来呢是因为lucene分析英文的时候不会搜索the to of 等无用的词(搜这些词是无意义的)。 3.New StandardAnlayzer()对于英文的分词是按空格和一些无用的词，而中文呢是全部的单个的字。 4.设置Field的最大长度是以0开头和数组一样。程序员之家----------3--------程序员之 0 1 2 3 Welcome to the home of programmers------3------Welcome to the home of programmers 0 1 2 大家还可以试一下别的，以便加深一下印象 (未完)

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