lucene_基于lucene的搜索引擎_lucene是搜索引擎么(2)

3、Lucene创建索引库及查询

public class IndexWriterDemo {
	/**
	 * 将即将检索的资源写入索引库
	 * @param writer
	 * @throws Exception
	 */
	public void buildDocs(IndexWriter writer)throws Exception {
		writer.deleteAll();//清空索引库里已存在的文档（document）
		List<User> list = DataUtil.getUsers();//得到数据资源
		System.out.println("buildDocs()->总人数为 :"+list.size());
		for(User user :list){
			Document doc = new Document();//创建索引库的文档
			doc.add(new Field("id",String.valueOf(user.getId()),Store.YES,Index.NO));
			doc.add(new Field("name",user.getName(),Store.YES,Index.ANALYZED));
			doc.add(new Field("age",String.valueOf(user.getAge()),Store.YES,Index.ANALYZED));
			doc.add(new Field("",user.getSex(),Store.YES,Index.ANALYZED));
			doc.add(new Field("birthday",String.valueOf(user.getBirthday()),Store.YES,Index.ANALYZED));
			writer.addDocument(doc);//将文档写入索引库
		}
		int count =writer.numDocs();
		writer.forceMerge(100);//合并索引库文件
		writer.close();
		System.out.println("buildDocs()->存入索引库的数量："+count);
	}

	/**
	 * 从索引库中搜索你要查询的数据
	 * @param searcher
	 * @throws IOException
	 */
	public void searcherDocs(IndexSearcher searcher) throws IOException{
		Term term =new Term("", "man");//查询条件，意思是我要查找性别为“man”的人
		TermQuery query =new TermQuery(term);
		TopDocs docs =searcher.search(query, 100);//查找
		System.out.println("searcherDoc()->男生人数："+docs.totalHits);
		for(ScoreDoc doc:docs.scoreDocs){//获取查找的文档的属性数据
			int docID=doc.doc;
			Document document =searcher.doc(docID);
			String str="ID:"+document.get("id")+",姓名："+document.get("name")+"，性别："+document.get("");
			System.out.println("人员信息:"+str);
		}
	}
  }

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