Lucene 时间排序



Lucene 时间排序
在Lucene4.6中,想要实现搜索结果按照时间倒序的效果:如果两个文档得分相同,那么就按照发布时间倒序排列;否则就按照分数排列。这种效果在Lucene4.6中实现起来极其简单,直接利用search接口的Sort参数即可达成,完全不需要像某些人说的重写Similarity那么麻烦。三两行代码的事情,体现了Make it simple, stupid的精髓。
            Sort sort = new Sort(new SortField("text", SortField.Type.SCORE), new SortField("date", SortField.Type.INT, true));
            TopDocs topDocs = isearcher.search(query, 5, sort);
            System.out.println("命中:" + topDocs.totalHits);
            //输出结果
            ScoreDoc[] scoreDocs = topDocs.scoreDocs;
            for (int i = 0; i < Math.min(5, scoreDocs.length); i++)
            {
                Document targetDoc = isearcher.doc(scoreDocs[i].doc);
                System.out.print(targetDoc.getField(fieldName).stringValue());
                System.out.print(" , " + targetDoc.getField("date").numericValue());
                System.out.println(" , " + scoreDocs[i].score);
            }
我们看到“2006年光棍节攻略”因为时间比较新,并且相关性高,就排在了第一。“2005年光棍节攻略”相关度相同,因为时间旧就排在后面一点,而干扰文档“游戏攻略”即使时间最新,因为不相关的原因排在最后面。这种效果正好是我想要的,极大提升了用户体验。
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