lucene2.0学习文档三

先看一下它的构造函数:
IndexWriter (Directory d, Analyzer a, boolean create)
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：
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();
}