Lucene初學——1. 創建索引，添加目錄，文檔

1.maven依賴

<dependencies>
  	<!-- lucene-queryparser -->
	<dependency>
	    <groupId>org.apache.lucene</groupId>
	    <artifactId>lucene-queryparser</artifactId>
	    <version>${lucene-version}</version>
	</dependency>
	
	<!-- lucene-highlighter -->
	<dependency>
	    <groupId>org.apache.lucene</groupId>
	    <artifactId>lucene-highlighter</artifactId>
	    <version>${lucene-version}</version>
	</dependency>
	
  	<!-- lucene-analyzers-smartcn -->
	<dependency>
	    <groupId>org.apache.lucene</groupId>
	    <artifactId>lucene-analyzers-smartcn</artifactId>
	    <version>${lucene-version}</version>
	</dependency>
	  	
  </dependencies>

這些依賴中已經包含對核心包等必要jar的依賴

2.demo

public static void main(String[] args) {
		// Analyzer類負責分析一個文件，並從將被索引的文本獲取令牌/字。不加分析完成後，IndexWriter不能創建索引。
		Analyzer analyzer = new StandardAnalyzer();
		// 此類充當創造/在索引過程中更新指標的核心組成部分
		IndexWriterConfig config = new IndexWriterConfig(analyzer);
		// 模式：創建或追加
		config.setOpenMode(OpenMode.CREATE_OR_APPEND);
		// Directory類表示索引的存儲位置，並通常是文件的列表。這些文件被稱爲索引文件。索引文件通常創建一次，然後用於讀操作或可以被刪除。
		Directory directory = null;
		IndexWriter writer = null;
		try {
			// 創建
			directory = FSDirectory.open(Paths.get("E:\\document\\【進階之路】\\技術\\lucene\\index"));
			writer = new IndexWriter(directory, config);
		} catch (IOException e) {
			e.printStackTrace();
		}
		
		// 文檔表示一個虛擬文檔與字段，其中字段是可包含在物理文檔的內容，它的元數據等的對象。Analyzer只能理解文檔。 
		Document doc1 = new Document();
		/*
		 * YES:
		 * Store the original field value in the index. 
		 * This is useful for short texts like a document's title which should be displayed with the results. 
		 * The value is stored in its original form, i.e. no analyzer is used before it is stored
		 * NO:
		 * Do not store the field value in the index.
		 */
		doc1.add(new StringField("id", "a", Store.YES));
		doc1.add(new TextField("content", "lucene學習案例", Store.YES));
		// 數值類型的添加需要對應的Point類加上StoredField
		doc1.add(new IntPoint("num", 1));
		doc1.add(new StoredField("num", 1));
		
		try {
			writer.addDocument(doc1);
		} catch (IOException e) {
			e.printStackTrace();
		}
		
		Document doc2 = new Document();
		doc2.add(new StringField("id", "c", Store.YES));
		doc2.add(new TextField("content", "Lucene案例開發", Store.YES));
		doc2.add(new IntPoint("num", 2));
		doc2.add(new StoredField("num", 2));
		
		try {
			writer.addDocument(doc2);
		} catch (IOException e) {
			e.printStackTrace();
		}
		
		try {
			writer.commit();
			// 關閉資源
			writer.close();
			directory.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
		
	}

3.導包

import java.io.IOException;
import java.nio.file.Paths;

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.Store;
import org.apache.lucene.document.IntPoint;
import org.apache.lucene.document.StoredField;
import org.apache.lucene.document.StringField;
import org.apache.lucene.document.TextField;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.IndexWriterConfig.OpenMode;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;

4.查看，結果查詢，使用luke工具

附luke地址：

https://github.com/DmitryKey/luke/releases