代码片段，lucene基本操作(基于lucene4.10.2)

1.最基本的创建索引：

@Test
public void testIndex(){
try {
Directory directory = FSDirectory.open(new File(LUCENE_DIRECTORY));
IndexWriter indexWriter = new IndexWriter(directory,new IndexWriterConfig(Version.LATEST,new StandardAnalyzer()));
Document document = new Document();
TextField titleFiled = new TextField("name","jiaoyiping", Field.Store.YES);
document.add(titleFiled);
indexWriter.addDocument(document);
indexWriter.commit();
indexWriter.close();
} catch (Exception e) {
e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
}
}

2.使用FieldType创建索引

//使用FieldType创建Field(4.X之后才有)
@Test
public  void testCreateIndexUseFieldType(){
try {
Directory directory = FSDirectory.open(new File(LUCENE_DIRECTORY));
IndexWriter indexWriter = new IndexWriter(directory,new IndexWriterConfig(Version.LATEST,new StandardAnalyzer()));
Document document = new Document();
FieldType titleType = new FieldType();
titleType.setIndexed(true);//索引选项
titleType.setStored(true); //存储选项
Field field = new Field("title","下班",titleType);
TextField titleFiled = new TextField("name","jiaoyiping", Field.Store.YES);
document.add(titleFiled);
document.add(field);
indexWriter.addDocument(document);
indexWriter.commit();
indexWriter.close();
} catch (Exception e) {
e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
}
}

搜索示例：

/**
* 搜索示例
*/
@Test
public void  testQuery(){
try {
IndexReader indexReader = DirectoryReader.open(FSDirectory.open(new File(LUCENE_DIRECTORY)));
IndexSearcher searcher = new IndexSearcher(indexReader);
QueryParser queryParser = new QueryParser("title",new StandardAnalyzer());
Query query = queryParser.parse("下班");
ScoreDoc[] docs = searcher.search(query,20).scoreDocs; //命中的数组
for(ScoreDoc sd:docs){
int docNumber = sd.doc;
System.out.println("文档号: "+docNumber);
Document doc = searcher.doc(docNumber);//根据文档号来查询文档
System.out.println(doc.get("name"));
}

} catch (Exception e) {
e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
}
}

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