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import java.util.ArrayList;

import java.util.List;

import org.apache.lucene.analysis.Analyzer;

import org.apache.lucene.analysis.standard.StandardAnalyzer;

import org.apache.lucene.index.IndexWriter;

import org.apache.lucene.index.Term;

import org.apache.lucene.index.IndexWriter.MaxFieldLength;

import org.apache.lucene.queryParser.MultiFieldQueryParser;

import org.apache.lucene.queryParser.QueryParser;

import org.apache.lucene.search.IndexSearcher;

import org.apache.lucene.search.Query;

import org.apache.lucene.search.TopDocs;

import cn.itcast.cc.lucene.helloword.Article;

import cn.itcast.cc.lucene.helloword.utils.ArticleDocUtils;

public class IndexDao {

    // 索引目錄

    private String indexPath = "./index";

    // 分詞器

    private Analyzer analyzer = new StandardAnalyzer();

    /**

     * 保存記錄

     *

     * @param art

     */

    public void save(Article art) {

        // lucene的寫出索引類

        IndexWriter indexWriter = null;

        try {

            indexWriter = new IndexWriter(this.indexPath, this.analyzer,

                    MaxFieldLength.LIMITED);

            // 添加到索引庫

            indexWriter.addDocument(ArticleDocUtils.Article2Doc(art));

        } catch (Exception e) {

            e.printStackTrace();

        }

        // 釋放indexWriter

        if (indexWriter != null) {

            try {

                // 使用后一定要關閉

                indexWriter.close();

            } catch (Exception e) {

                e.printStackTrace();

            }

        }

    }

    /**

     * 更新記錄

     *

     * @param art

     */

    public void update(Article art) {

        IndexWriter indexWriter = null;

        try {

            indexWriter = new IndexWriter(this.indexPath, this.analyzer,

                    MaxFieldLength.LIMITED);

            Term term = new Term("id", art.getId() + "");

            // 更新

            indexWriter.updateDocument(term, ArticleDocUtils.Article2Doc(art));

        } catch (Exception e) {

            e.printStackTrace();

        }

        // 釋放indexWriter

        if (indexWriter != null) {

            try {

                indexWriter.close();

            } catch (Exception e) {

                e.printStackTrace();

            }

        }

    }

    /**

     * 刪除記錄

     *

     * @param id

     */

    public void delete(int id) {

        IndexWriter indexWriter = null;

        try {

            indexWriter = new IndexWriter(this.indexPath, this.analyzer,

                    MaxFieldLength.LIMITED);

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

            // 刪除

            indexWriter.deleteDocuments(term);

        } catch (Exception e1) {

            e1.printStackTrace();

        }

        // 釋放indexWriter

        if (indexWriter != null) {

            try {

                indexWriter.close();

            } catch (Exception e) {

                e.printStackTrace();

            }

        }

    }

    /**

     * 查詢記錄（具有分頁功能）

     *

     * @param queryString

     * @param startIndex

     * @param recordCount

     * @return

     */

    public List search(String queryString, int startIndex, int recordCount) {

        List result = new ArrayList();

        IndexSearcher indexSearcher = null;

        try {

            indexSearcher = new IndexSearcher(this.indexPath);

            String[] fields = new String[] {"title","content"};

            // 分析查詢條件

            QueryParser queryParser = new MultiFieldQueryParser(fields,

                    this.analyzer);

            // 生成查詢對象

            Query query = queryParser.parse(queryString);

            int findTotalRecord = startIndex + recordCount;

            // 查詢

            TopDocs topDocs = indexSearcher.search(query, null, findTotalRecord);

            //獲取分頁數據

            int endIndex = Math.min(startIndex+recordCount,topDocs.totalHits);

            for(int i=startIndex; i<endIndex;i++){

                result.add(indexSearcher.doc(topDocs.scoreDocs[i].doc));

            }

        } catch (Exception e1) {

            e1.printStackTrace();

        }

        // 釋放indexWriter

        if (indexSearcher != null) {

            try {

                indexSearcher.close();

            } catch (Exception e) {

                e.printStackTrace();

            }

        }

        return result;

    }

}

import org.apache.lucene.document.Document;

import org.apache.lucene.document.Field;

import org.apache.lucene.document.Field.Index;

import org.apache.lucene.document.Field.Store;

import cn.itcast.cc.lucene.helloword.Article;

public class ArticleDocUtils {

    public static Document Article2Doc(Article art){

        // lucene索引庫中的document對象

        Document doc = new Document();

        // 添加到document中的都是field對象，注冊其中的key，檢索時會用到。

        // Store是否存儲，決定對象是臨時性還是持久性的

        // Index在庫中建立什么樣的索引

        doc.add(new Field("id", art.getId()+"", Store.YES, Index.NOT_ANALYZED));

        doc.add(new Field("title", art.getTitle(), Store.YES, Index.ANALYZED));

        doc.add(new Field("content", art.getContent(), Store.YES, Index.ANALYZED));

        return doc;

    }

    public static Article Doc2Article(Document doc){

        Article art = new Article();

        art.setId(Integer.parseInt(doc.getField("id").stringValue()));

        art.setTitle(doc.getField("title").stringValue());

        art.setContent(doc.getField("content").stringValue());

        return art;

    }