我的Lucene搜索没有返回结果
我正在学习Lucene，这是我的第一堂考试。 我正在尝试实现内存搜索并从示例中借用一些代码。 但搜索不能返回任何命中。 你可以帮帮我吗？ 谢谢。
package my.test; import java.io.IOException; import org.apache.lucene.analysis.standard.StandardAnalyzer; import org.apache.lucene.analysis.util.CharArraySet; import org.apache.lucene.document.Document; import org.apache.lucene.document.Field; import org.apache.lucene.document.StringField; import org.apache.lucene.index.IndexWriter; import org.apache.lucene.index.IndexWriterConfig; import org.apache.lucene.index.IndexWriterConfig.OpenMode; import org.apache.lucene.index.Term; import org.apache.lucene.search.BooleanClause; import org.apache.lucene.search.BooleanQuery; import org.apache.lucene.search.IndexSearcher; import org.apache.lucene.search.PrefixQuery; import org.apache.lucene.search.ScoreDoc; import org.apache.lucene.search.SearcherManager; import org.apache.lucene.store.RAMDirectory; import org.apache.lucene.util.Version; public class TestInMemorySearch { public static void main(String[] args) { // Construct a RAMDirectory to hold the in-memory representation of the index. RAMDirectory idx = new RAMDirectory(); try { // Make an writer to create the index IndexWriterConfig iwc = new IndexWriterConfig(Version.LUCENE_42, new StandardAnalyzer(Version.LUCENE_42, CharArraySet.EMPTY_SET)); iwc.setOpenMode(OpenMode.CREATE_OR_APPEND); IndexWriter writer = new IndexWriter(idx, iwc); // Add some Document objects containing quotes writer.addDocument(createDocument("Theodore Roosevelt man", "It behooves every man to remember that the work of the " + "critic, is of altogether secondary importance, and that, " + "in the end, progress is accomplished by the man who does " + "things.")); writer.addDocument(createDocument("Friedrich Hayek", "The case for individual freedom rests largely on the " + "recognition of the inevitable and universal ignorance " + "of all of us concerning a great many of the factors on " + "which the achievements of our ends and welfare depend.")); writer.addDocument(createDocument("Ayn Rand", "There is nothing to take a man's freedom away from " + "him, save other men. To be free, a man must be free " + "of his brothers.")); writer.addDocument(createDocument("Mohandas Gandhi", "Freedom is not worth having if it does not connote " + "freedom to err.")); // Optimize and close the writer to finish building the index writer.close(); // Build an IndexSearcher using the in-memory index SearcherManager mgr = new SearcherManager(idx, null); try { Document[] hits = search(mgr, "man", 100); for (Document doc : hits) { String title = doc.get("title"); String content = doc.get("content"); System.out.println("Found match:[Title]" + title + ", [Content]" + content); } } catch (IOException e) { e.printStackTrace(); } } catch (IOException ioe) { // In this example we aren't really doing an I/O, so this // exception should never actually be thrown. ioe.printStackTrace(); } } /** * Make a Document object with an un-indexed title field and an indexed * content field. */ private static Document createDocument(String title, String content) { Document doc = new Document(); doc.add(new StringField("title", title, Field.Store.YES)); doc.add(new StringField("content", content, Field.Store.YES)); return doc; } private static Document[] search(SearcherManager searchManager, String searchString, int maxResults) throws IOException { IndexSearcher searcher = null; try { // Build the query. String[] tokens = searchString.split("\\s+"); BooleanQuery query = new BooleanQuery(); for (String token : tokens) { query.add(new PrefixQuery(new Term("title", token)), BooleanClause.Occur.MUST); query.add(new PrefixQuery(new Term("content", token)), BooleanClause.Occur.MUST); } searcher = searchManager.acquire(); ScoreDoc[] scoreDocs = searcher.search(query, maxResults).scoreDocs; Document[] documents = new Document[scoreDocs.length]; for (int i = 0; i < scoreDocs.length; i++) { documents[i] = searcher.doc(scoreDocs[i].doc); } return documents; } finally { if (searcher != null) { searchManager.release(searcher); } } } } StringField似乎是一个明显的选择，但它不是你想在这里使用的。 你想要TextField 。 StringField将字段表示为单个标记，实质上是关键字或标识符。 TextField分析并标记字段以进行全文搜索。
修复它就像在search方法中更改一样简单：
doc.add(new StringField("title", title, Field.Store.YES)); doc.add(new StringField("content", content, Field.Store.YES));
至
doc.add(new TextField("title", title, Field.Store.YES)); doc.add(new TextField("content", content, Field.Store.YES));