lucene 3.0 sort 类适用--个人看的没做注释

最新推荐文章于 2025-08-10 14:29:07 发布

最新推荐文章于 2025-08-10 14:29:07 发布 · 138 阅读

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本文通过一个具体的例子展示了如何使用Apache Lucene进行全文检索。包括建立索引、搜索过程及结果排序等内容。创建了2000条示例数据，并使用标准分析器进行处理。

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package org.apache.lucene.demo;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Random;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.NumericField;
import org.apache.lucene.index.CorruptIndexException;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.queryParser.ParseException;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.Searcher;
import org.apache.lucene.search.Sort;
import org.apache.lucene.search.SortField;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.LockObtainFailedException;
import org.apache.lucene.store.RAMDirectory;
import org.apache.lucene.util.Version;

public class Test {

	public static void main(String[] args) throws CorruptIndexException,
			LockObtainFailedException, IOException, ParseException {
		List<PoJo> all = getList();
		Directory directory = new RAMDirectory();
		Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_CURRENT);
		IndexWriter indexWriter = new IndexWriter(directory, analyzer, true,
				IndexWriter.MaxFieldLength.LIMITED);
		Document document = null;
		Iterator<PoJo> it = all.iterator();
		PoJo pojo = null;
		while (it.hasNext()) {
			pojo = it.next();
			document = new Document();
			document.add(new NumericField("id", Field.Store.YES, true)
					.setIntValue(pojo.getId()));
			document.add(new Field("name", pojo.getName(), Field.Store.YES,
					Field.Index.ANALYZED));
			document.add((new NumericField("order", Field.Store.YES, true)
					.setIntValue(pojo.getOrder())));
			indexWriter.addDocument(document);
		}
		indexWriter.optimize();
		indexWriter.close();

		IndexReader reader = IndexReader.open(directory, true);
		Searcher searcher = new IndexSearcher(reader);
		Sort sort = new Sort() ;
		sort.setSort(new SortField("order", SortField.INT ,true)) ;
		QueryParser parser = new QueryParser(Version.LUCENE_CURRENT, "name",
				analyzer);
		Query query = parser.parse("ZB");
		TopDocs results  = searcher.search(query, null, 2000, sort);

		for (int i = 0; i < results.scoreDocs.length; i++) {
			Document doc = searcher.doc(results.scoreDocs[i].doc);
			System.out.println(doc.get("id") + "   " + doc.get("name")
					+ "   " + doc.get("order"));
		}
	}

	public static List<PoJo> getList() {
		List<PoJo> all = new ArrayList<PoJo>();
		for (int i = 1; i < 2000; i++) {
			String name = getName(i);
			all.add(new PoJo(i, name + " " + new Random().nextInt(1000),
					new Random().nextInt(1000)));
		}
		return all;
	}

	public static String getName(int i) {
		String name = null;
		switch (i % 5) {
		case 0:
			name = "HB";
			break;
		case 1:
			name = "XJ";
			break;
		case 2:
			name = "XZ";
			break;
		case 3:
			name = "BJ";
			break;
		case 4:
			name = "ZB";
			break;

		default:
			name = "LJ";
		}
		return name;
	}
}

class PoJo {
	private int id;
	private String name;
	private int order;

	public PoJo(int id, String name, int order) {
		this.id = id;
		this.name = name;
		this.order = order;
	}

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getOrder() {
		return order;
	}

	public void setOrder(int order) {
		this.order = order;
	}
}