package loaderman.search;

import java.util.ArrayList;
import java.util.List;

import loaderman.entity.Article;
import loaderman.util.LuceneUtil;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.IndexWriter;
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.ScoreDoc;
import org.apache.lucene.search.TopDocs;
import org.junit.Test;


/**
 * 演示Lucene中，根據多個欄位搜尋*/
public class ArticleDao {
    
 
/**
     * 增加document物件索引庫中
     */
    @Test
    public void add() throws Exception{
        Article article = new Article(1,"學習","額外額外為",10);
        //Article article = new Article(2,"學習","額外it為",20);
        //Article article = new Article(3,"學習","額it額",20);
        //Article article = new Article(4,"學習","嗯嗯it嗯嗯",30);
 

        Document document = LuceneUtil.javabean2document(article);
        IndexWriter indexWriter = new IndexWriter(LuceneUtil.getDirectory()    ,LuceneUtil.getAnalyzer(),LuceneUtil.getMaxFieldLength());
        indexWriter.addDocument(document);
        indexWriter.close();
    }




    @Test
    public void findAll() throws Exception{
        String keywords = "機構";
        List<Article> articleList = new ArrayList<Article>();

        //單欄位搜尋
        //QueryParser queryParser = new QueryParser(LuceneUtil.getVersion(),"title",LuceneUtil.getAnalyzer());

        //多欄位搜尋，好處：搜尋的範圍大，最大限度匹配搜尋結果
        QueryParser queryParser =
                new MultiFieldQueryParser(
                        LuceneUtil.getVersion(),
                        new String[]{"content","title"},
                        LuceneUtil.getAnalyzer());


        Query query = queryParser.parse(keywords);
        IndexSearcher indexSearcher = new IndexSearcher(LuceneUtil.getDirectory());

        TopDocs topDocs = indexSearcher.search(query,100);

        for(int i=0;i<topDocs.scoreDocs.length;i++){
            ScoreDoc scoreDoc = topDocs.scoreDocs[i];
            int no = scoreDoc.doc;
            Document document = indexSearcher.doc(no);
            Article article = (Article) LuceneUtil.document2javabean(document,Article.class);
            articleList.add(article);
        }
        for(Article a : articleList){
            System.out.println(a);
        }
    }
}

package loaderman.entity;

/**
 * 文章
 */
public class Article {
    private Integer id;//編號
    private String title;//標題
    private String content;//內容
    private Integer count;//字數
    public Article(){}
    public Article(Integer id, String title, String content, Integer count) {
        this.id = id;
        this.title = title;
        this.content = content;
        this.count = count;
    }
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    public String getContent() {
        return content;
    }
    public void setContent(String content) {
        this.content = content;
    }
    public Integer getCount() {
        return count;
    }
    public void setCount(Integer count) {
        this.count = count;
    }
    @Override
    public String toString() {
        return "編號:" + id + "標題:" + title + "內容:" + content + "字數: " + count;
    }
}