lucene 过滤结果

 

 

package cn.itcast.h_filter;

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

import org.apache.lucene.document.Document;
import org.apache.lucene.queryParser.MultiFieldQueryParser;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.Filter;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.NumericRangeFilter;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.Sort;
import org.apache.lucene.search.SortField;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.util.Version;
import org.junit.Test;

import cn.itcast._domain.Article;
import cn.itcast._util.ArticleDocumentUtils;
import cn.itcast._util.LuceneUtils;

public class TestApp {

    // 搜索
    @Test
    public void testSearch() throws Exception {
        // 准备查询条件
        String queryString = "lucene";

        // 执行搜索
        List<Article> list = new ArrayList<Article>();

        // 1，把查询字符串转为Query对象（从title和content中查询）
        QueryParser queryParser = new MultiFieldQueryParser(Version.LUCENE_30, new String[] { "title", "content" }, LuceneUtils.getAnalyzer());
        Query query = queryParser.parse(queryString);

        // 2，执行查询，得到中间结果
        IndexSearcher indexSearcher = new IndexSearcher(LuceneUtils.getDirectory()); // 指定所用的索引库
        // TopDocs topDocs = indexSearcher.search(query, 100); // 最多返回前n条结果

        // ========================================================================================== 【创建高亮器】
        // indexSearcher.search(query, n);
        // indexSearcher.search(query, filter, n);
        // indexSearcher.search(query, filter, n, sort);

        Filter filter = NumericRangeFilter.newIntRange("id", 5, 15, false, true); // null表示没有过滤条件   选择 (5,15] 之间的过滤的数据，后面的boolean判断 括号开闭用处的
        TopDocs topDocs = indexSearcher.search(query, filter, 100);

        // ==========================================================================================

        // 3，处理结果
        for (int i = 0; i < topDocs.scoreDocs.length; i++) {
            // 根据编号拿到Document数据
            int docId = topDocs.scoreDocs[i].doc; // Document的内部编号
            Document doc = indexSearcher.doc(docId);
            // 把Document转为Article
            Article article = ArticleDocumentUtils.documentToArticle(doc);
            list.add(article);
        }
        indexSearcher.close();

        // 显示结果
        System.out.println("总结果数：" + list.size());
        for (Article a : list) {
            System.out.println("------------------------------");
            System.out.println("id = " + a.getId());
            System.out.println("title = " + a.getTitle());
            System.out.println("content = " + a.getContent());
        }
    }
}