1 package cn.itcast.g_sort;  2   3 import java.util.ArrayList;  4 import java.util.List;  5   6 import org.apache.lucene.document.Document;  7 import org.apache.lucene.document.Field;  8 import org.apache.lucene.document.Field.Index;  9 import org.apache.lucene.document.Field.Store; 10 import org.apache.lucene.index.IndexWriter; 11 import org.apache.lucene.index.IndexWriter.MaxFieldLength; 12 import org.apache.lucene.queryParser.MultiFieldQueryParser; 13 import org.apache.lucene.queryParser.QueryParser; 14 import org.apache.lucene.search.IndexSearcher; 15 import org.apache.lucene.search.Query; 16 import org.apache.lucene.search.Sort; 17 import org.apache.lucene.search.SortField; 18 import org.apache.lucene.search.TopDocs; 19 import org.apache.lucene.search.highlight.Formatter; 20 import org.apache.lucene.search.highlight.Highlighter; 21 import org.apache.lucene.search.highlight.QueryScorer; 22 import org.apache.lucene.search.highlight.Scorer; 23 import org.apache.lucene.search.highlight.SimpleFragmenter; 24 import org.apache.lucene.search.highlight.SimpleHTMLFormatter; 25 import org.apache.lucene.util.Version; 26 import org.junit.Test; 27  28 import cn.itcast._domain.Article; 29 import cn.itcast._util.ArticleDocumentUtils; 30 import cn.itcast._util.LuceneUtils; 31  32 public class TestApp { 33  34     // 建立索引 35     @Test 36     public void testCreateIndex() throws Exception { 37         // 准备数据 38         Article article = new Article(); 39         article.setId(30); 40         article.setTitle("准备Lucene的开发环境"); 41         article.setContent("如果信息检索系统在用户发出了检索请求后再去互联网上找答案，根本无法在有限的时间内返回结果。"); 42  43         // 放到索引库中 44         // 1, 把Article转为Document 45         Document doc = ArticleDocumentUtils.articleToDocument(article); 46  47         doc.setBoost(0.5F); // 1F表示正常得分，大于1表示高分，小于1表示低分 48  49         // 2, 把Document放到索引库中 50         LuceneUtils.getIndexWriter().addDocument(doc); 51         LuceneUtils.getIndexWriter().commit(); 52     } 53  54     // 搜索 55     @Test 56     public void testSearch() throws Exception { 57         // 准备查询条件 58         String queryString = "lucene"; 59  60         // 执行搜索 61         List<Article> list = new ArrayList<Article>(); 62  63         // 1，把查询字符串转为Query对象（从title和content中查询） 64         QueryParser queryParser = new MultiFieldQueryParser(Version.LUCENE_30, new String[] { "title", "content" }, LuceneUtils.getAnalyzer()); 65         Query query = queryParser.parse(queryString); 66  67         // 2，执行查询，得到中间结果 68         IndexSearcher indexSearcher = new IndexSearcher(LuceneUtils.getDirectory()); // 指定所用的索引库 69         // TopDocs topDocs = indexSearcher.search(query, 100); // 最多返回前n条结果 70  71         // ========================================================================================== 【创建高亮器】 72         // indexSearcher.search(query, n); 73         // indexSearcher.search(query, filter, n); 74         // indexSearcher.search(query, filter, n, sort); 75  76         // Sort sort = new Sort( new SortField("id", SortField.INT) ); // 按id升序排列 77         Sort sort = new Sort(new SortField("id", SortField.INT, true)); // 按id降序排列（true表示降序，false表示升序） 78  79         TopDocs topDocs = indexSearcher.search(query, null, 100, sort); 80  81         // ========================================================================================== 82  83         // 3，处理结果 84         for (int i = 0; i < topDocs.scoreDocs.length; i++) { 85             float score = topDocs.scoreDocs[i].score; 86             System.out.println("---> score : " + score); 87  88             // 根据编号拿到Document数据 89             int docId = topDocs.scoreDocs[i].doc; // Document的内部编号 90             Document doc = indexSearcher.doc(docId); 91             // 把Document转为Article 92             Article article = ArticleDocumentUtils.documentToArticle(doc); 93             list.add(article); 94         } 95         indexSearcher.close(); 96  97         // 显示结果 98         System.out.println("总结果数：" + list.size()); 99         for (Article a : list) {100             System.out.println("------------------------------");101             System.out.println("id = " + a.getId());102             System.out.println("title = " + a.getTitle());103             System.out.println("content = " + a.getContent());104         }105     }106 }