你可以帮我写一段java代码实现一个简单的搜索引擎吗

好的，以下是一个简单的Java代码示例，用于实现一个基于Lucene的全文搜索引擎：

import java.io.IOException;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
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.IndexableField;
import org.apache.lucene.queryparser.classic.ParseException;
import org.apache.lucene.queryparser.classic.QueryParser;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.RAMDirectory;

public class SimpleSearchEngine {
    public static void main(String[] args) throws IOException, ParseException {
        
        // 创建一个内存索引库
        Directory indexDirectory = new RAMDirectory();
        
        // 创建一个索引写入器
        IndexWriterConfig config = new IndexWriterConfig(new StandardAnalyzer());
        IndexWriter writer = new IndexWriter(indexDirectory, config);
        
        // 添加一些文档到索引库中
        addDocument(writer, "1", "Lucene is a full-text search engine library in Java.");
        addDocument(writer, "2", "It is very fast and highly scalable.");
        addDocument(writer, "3", "Lucene provides advanced features like fuzzy search and proximity search.");
        
        // 关闭索引写入器
        writer.close();
        
        // 创建一个查询器
        IndexSearcher searcher = new IndexSearcher(indexDirectory);
        QueryParser parser = new QueryParser("content", new StandardAnalyzer());
        
        // 搜索文档
        Query query = parser.parse("full-text search");
        TopDocs results = searcher.search(query, 10);
        
        // 输出搜索结果
        System.out.println("Total hits: " + results.totalHits);
        for (ScoreDoc hit : results.scoreDocs) {
            Document document = searcher.doc(hit.doc);
            System.out.println(document.get("id") + " " + document.get("content"));
        }
        
        // 关闭查询器和索引库
        searcher.getIndexReader().close();
        indexDirectory.close();
    }
    
    // 添加文档到索引库中
    private static void addDocument(IndexWriter writer, String id, String content) throws IOException {
        Document document = new Document();
        IndexableField idField = new StringField("id", id, Field.Store.YES);
        IndexableField contentField = new StringField("content", content, Field.Store.YES);
        document.add(idField);
        document.add(contentField);
        writer.addDocument(document);
    }
}

这个示例创建一个内存索引库，并添加三个文档到索引库中，然后搜索包含“full-text search”关键词的文档，并输出搜索结果。