Lucene add、updateDocument添加、更新与search查询(转)

package com.lucene;

 

import java.io.IOException;

 

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.index.Term;

import org.apache.lucene.queryParser.QueryParser;

import org.apache.lucene.search.Hits;

import org.apache.lucene.search.IndexSearcher;

import org.apache.lucene.search.Query;

 

public class UpdateDocument {

     

    private static String path = "d:/index";

     

     

    public static void main(String[] args){

//        addIndex();

        updateIndex();

        search("李四");

        search("王五");

    }

     

    public static void addIndex(){

        try {

            IndexWriter write = new IndexWriter(path,new StandardAnalyzer(),true);

             

            Document doc = new Document();

            doc.add(new Field("id","123456",Field.Store.YES,Field.Index.UN_TOKENIZED));

            doc.add(new Field("userName","张三",Field.Store.YES,Field.Index.TOKENIZED));

            doc.add(new Field("comefrom","北京",Field.Store.YES,Field.Index.TOKENIZED));

             

            write.addDocument(doc);

             

            write.close();

             

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

     

     

    public static void updateIndex(){

        try {

             

            IndexWriter write = new IndexWriter(path,new StandardAnalyzer(),false);

            Document docNew = new Document();

            docNew.add(new Field("id","123456",Field.Store.YES,Field.Index.UN_TOKENIZED));

            docNew.add(new Field("userName","王五",Field.Store.YES,Field.Index.TOKENIZED));

            Term term = new Term("id","123456");

            /**

              调用updateDocument的方法，传给它一个新的doc来更新数据，

              Term term = new Term("id","1234567");

              先去索引文件里查找id为1234567的Doc,如果有就更新它(如果有多条，最后更新后只有一条)。如果没有就新增.

             

              数据库更新的时候，我们可以只针对某个列来更新，而lucene只能针对一行数据更新。

             */

            write.updateDocument(term, docNew);

             

            write.close();

             

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

 

    public static Query queryParser(String str){

        QueryParser queryParser = new QueryParser("userName", new StandardAnalyzer());

        try {

            Query query =  queryParser.parse(str);

            return query;

        } catch (Exception e) {

            e.printStackTrace();

        }

        return null;

    }

     

    public static void search(String str){

        try {

            IndexSearcher search = new IndexSearcher(path);

             

            Query query = queryParser(str);

             

            Hits hits = search.search(query);

            if(hits==null){

                return;

            }

            if(hits.length() == 0){

                System.out.println(" 没有搜索到'" + str+"'");

                return;

            }

            for (int i = 0; i < hits.length(); i++) {

                Document doc = hits.doc(i);

                System.out.println("id = "+hits.id(i));

                System.out.println("own id = " + doc.get("id"));

                System.out.println("userName = "+doc.get("userName"));

                System.out.println("come from  = "+doc.get("comefrom"));

                System.out.println("");

            }

             

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

 

}