lucene 入门

public void index() {
//1.创建Directory
Directory directory = null;
Analyzer analyzer = null;
IndexWriterConfig iwc = null;
IndexWriter writer = null ;
try {
//Directory directory = new RAMDirectory();//建立在内存中
directory = FSDirectory.open(Paths.get("L:/java/study/lucenc1/src/main/resources/example/index01"));//建立在硬盘上
//2. 创建IndexWriter
analyzer = new StandardAnalyzer();
iwc = new IndexWriterConfig(analyzer);
writer = new IndexWriter(directory, iwc);
//3.创建Document对象
Document d = null;
//4. 位Document 添加Field
File f= new File("L:/java/study/lucenc1/src/main/resources/example/lucene");
for(File file : f.listFiles()){
d = new Document();
d.add(new TextField("content",new BufferedReader(new InputStreamReader(new FileInputStream(file), StandardCharsets.UTF_8))));
d.add(new StringField("filename", file.getName(),Field.Store.YES));
d.add(new StringField("path", file.toString(), Field.Store.YES) );
writer.addDocument(d);
}
} catch (IOException e) {
e.printStackTrace();
} finally{
if(writer != null){
try {
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}

public void searcher(){
Directory directory = null;
IndexReader reader = null;
IndexSearcher searcher = null;
Analyzer analyzer = null;
QueryParser parser = null;
try {
//1.创建Directory
directory = FSDirectory.open(Paths.get("L:/java/study/lucenc1/src/main/resources/example/index01"));
//2.创建IndexReader
reader = DirectoryReader.open(directory);
//3.根据IndexReader创建IndexSearcher
searcher = new IndexSearcher(reader);
//4.创建搜索的Query
//创建parser来确定要搜索文件的内容，第二个参数表示搜索的域
analyzer = new StandardAnalyzer();
parser = new QueryParser("content", analyzer);
//创建query，表示搜索域为content中包含java的文档
Query query = parser.parse("linux");
//5.根据searcher搜索并且返回TopDoces
TopDocs tds = searcher.search(query, 10);//10  搜索的条数
//6.根据topDocs获取scoreDoc对象
ScoreDoc[] sds = tds.scoreDocs;
for(ScoreDoc sd : sds){
//7.根据searcher和scoreDoc对象获取具体的Document对象
Document d = searcher.doc(sd.doc);
//8.根据Document对象获取需要的值
System.out.println(d.get("filename")+"["+d.get("path")+"]");
}
//9.关闭reader
} catch (IOException e) {
e.printStackTrace();
} catch (ParseException e) {
e.printStackTrace();
} finally{
if(reader != null) {
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}