一、初步认识lucene
环境搭建：
1、lucene-core-3.5.0.jar
2、mmseg4j-all-1.8.5-with-dic.jar（中文分词器）
3、lucene-highlighter-3.5.0.jar、lucene-memory-3.5.0.jar（高亮显示）
在全文索引工具中，都是由这样的三部分组成
1、索引部分(I am a boy)
2、分词部分
3、搜索部分
/**
* 建立索引
*/
public void index() {
//1、创建Directory
//Directory directory = new RAMDirectory();//建立在内存中
Directory directory = null;
try {
directory = FSDirectory.open(new File("D:/test/index01"));
} catch (IOException e1) {
e1.printStackTrace();
}
//2、创建IndexWriter
IndexWriterConfig config = new IndexWriterConfig(Version.LUCENE_36, new StandardAnalyzer(
Version.LUCENE_36));
IndexWriter writer = null;
try {
writer = new IndexWriter(directory, config);
//3、创建Document对象
Document document = null;
//4、为Document添加Field
Collection<File> files = FileUtils.listFiles(new File("D:/test/lucene"),
FileFileFilter.FILE, null);
for (File file : files) {
document = new Document();
document.add(new Field("content", new FileReader(file)));
document.add(new Field("filename", file.getName(), Field.Store.YES,
Field.Index.NOT_ANALYZED));
document.add(new Field("path", file.getAbsolutePath(), Field.Store.YES,
Field.Index.NOT_ANALYZED));//是否存储路径，是否进行分词
writer.addDocument(document);
}
//5、通过IndexWriter添加对象到索引中
} catch (CorruptIndexException e) {
e.printStackTrace();
} catch (LockObtainFailedException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (writer != null) {
try {
writer.close();
} catch (CorruptIndexException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
/**
* 搜索
*/
public void searcher() {
try {
//1、创建Directory
Directory directory = FSDirectory.open(new File("D:/test/index01"));
//2、创建IndexReader
IndexReader reader = IndexReader.open(directory);
//3、根据IndexReader创建IndexSearcher
IndexSearcher searcher = new IndexSearcher(reader);
//4、创建搜索的Query
QueryParser parser = new QueryParser(Version.LUCENE_36, "content",
new StandardAnalyzer(Version.LUCENE_36));//content表示搜索的Field
Query query = parser.parse("File");//表示内容中含有“File”的
//5、根据searcher搜索并返回TopDocs
TopDocs topDocs = searcher.search(query, 10);//只搜索10条
//6、根据TopDocs对象获取ScoreDoc对象
ScoreDoc[] sds = topDocs.scoreDocs;
for (ScoreDoc scoreDoc : sds) {
//7、根据searcher和ScoreDoc对象获取具体的Document对象
Document document = searcher.doc(scoreDoc.doc);
//8、根据Document对象获取需要的值
System.out.println(document.get("filename"));
System.out.println(document.get("path"));
}
//9、关闭reader
reader.clone();
} catch (Exception e) {
e.printStackTrace();
}
}