PetStore 之 Lucene 2.4

之前的几天发现上不了javaeye,当时很多东西想写一下的，现在不怎么想写了，

看了看lucene ,然后参照网上的一些例子做了稍微的改动：

参考：http://lin23871.iteye.com/blog/347092

 

package com.chen.lucene.test;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.Hits;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;

public class LuceneDB {

 /**
  * @param args
  */
 private Connection conn = null;

 // 在构造函数中添加
 public LuceneDB() {
  try {
   Class.forName("com.mysql.jdbc.Driver").newInstance();
   conn = DriverManager.getConnection(
     "jdbc:mysql://localhost:3306/lucene", "root", "chen"); //
  } catch (Exception e) {
   // TODO: handle exception
   System.out.println("没有连接上数据库");
  }
 }

 // 连接数据库
 public Connection getConnection() {
  return conn;
 }

 // 关闭连接
 public void close() {
  try {
   this.conn.close();

  } catch (Exception e) {
   // TODO: handle exception
   e.printStackTrace();
  }
 }

 public static void main(String[] args) throws Exception {
  // TODO 自动生成方法存根
  // 调用对象
  LuceneDB lucene = new LuceneDB();
  // 写入索引
  IndexWriter writer = null;
  Connection conn = lucene.getConnection();
  String sql = "select * from students";
  Analyzer analyzer = new StandardAnalyzer();
  // writer=new
  // IndexWriter("D:\\index3",analyzer,true,IndexWriter.MaxFieldLength.LIMITED);
  writer = new IndexWriter("D:\\index3", analyzer, true,
    IndexWriter.MaxFieldLength.LIMITED);
  PreparedStatement ps = conn.prepareStatement(sql);
  // Statement stmt=conn.createStatement();

  ResultSet rs = ps.executeQuery(sql);
  while (rs.next()) {
   Document doc = new Document();
   doc.add(new Field("age", rs.getString("SAGE"), Field.Store.YES,
     Field.Index.TOKENIZED));
   writer.addDocument(doc);
   // System.out.println("rs查询有结果");
  }
  rs.close();
  conn.close();
  writer.optimize();
  writer.close();

  // 寻找索引
  Directory dir = FSDirectory.getDirectory("D:\\index3");
  IndexSearcher searcher = new IndexSearcher(dir);

  QueryParser parser = new QueryParser("age", new StandardAnalyzer());
  Query query = parser.parse("19"); // 有待查询的字符串进行Query对象的转换

  if (searcher != null) {
   Hits hi = searcher.search(query);
   if (hi.length() >= 0) {
    System.out.println("找到：" + hi.length() + "个关键字");
   }
  }

  TopDocs topDocs = searcher.search(query, 1);
  ScoreDoc[] hits = topDocs.scoreDocs;
  for (int i = 0; i < hits.length; i++) {
   System.out.println("-----Lucene 检索结果为：------");
   int DocId = hits[i].doc;
   Document doc = searcher.doc(DocId);
   System.out.println(doc.get("age"));
  }

 }

}

 

数据库：

 

昨天，一开始我也像参考的例子中查询“张”，但是就是不行，今天我重新打开Eclipse

，之前我用.txt来搜索中文是没有问题的，然后改成了 检索一个数字 Yeah！

 

结果：

 

找到：2个关键字
-----Lucene 检索结果为：------
19