孔浩Lucene创建和域选项

一、域索引选项：
 

   //Field.Index(索引域选项)  
    //Index.ANALYZED:进行分词和索引，适用于标题、内容等  
    //Index.NOT_ANALYZED:进行索引，但是不进行分词，如果身份证号，姓名，ID等，适用于精确搜索  
    //Index.ANALYZED_NOT_NORMS:进行分词但是不存储norms信息，这个norms中包括了创建索引的时间和权值等信息  
    //Index.NOT_ANALYZED_NOT_NORMS:即不进行分词也不存储norms信息  
    //Index.NO:不进行索引  

二、域存储选项：
 

    //Field.Store.YES或者NO(存储域选项)  
    //设置为YES表示或把这个域中的内容完全存储到文件中，方便进行文本的还原  
    //设置为NO表示把这个域的内容不存储到文件中，但是可以被索引，此时内容无法完全还原(doc.get)  

三、最佳实践：

                                        

package org.it.index;

import java.io.File;
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.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.util.Version;

@SuppressWarnings("all")
public class IndexUtil {
	private String[] ids={"1","2","3","4","5","6"};
	private String[] emails={"[email protected]","[email protected]","[email protected]","[email protected]","[email protected]","[email protected]","[email protected]"};
	private String[] contents={
			"welcome to visited the space","hello boy","my name is cc","I like movie and swim","jijoij","wwwww","jjjjjjjjjjjj"
	};
	
	private int[] attachs ={2,3,4,3,5,6};
	private String[] names={"shanghai","zhangsan","john","mike","jake","jakedd"};
  
	//1.创建Directory
	private Directory directory=null;
	public IndexUtil(){
			try {
				directory=FSDirectory.open(new File("d:/lucene/index02"));
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
	}
    
	public void query(){
		try {
			IndexReader reader = IndexReader.open(directory);
			//存储的文档数
			<span style="color:#FF0000;">//小知识点：maxDoc 和 numDocs()方法的区别：maxDoc（）
			//返回索引中删除和未被删除的文档总数，后者返回索引中未被删除的文档总数</span>
			System.out.println("numDocs      "+reader.numDocs());
			//存储的文档总数
			System.out.println("maxDocs      "+reader.maxDoc());
			
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}
	public void index(){
		//创建IndexWriter
		IndexWriter writer=null;
		try {
			writer=new IndexWriter(directory, new IndexWriterConfig(Version.LUCENE_4_9,
					new StandardAnalyzer(Version.LUCENE_4_9)));
			// 3.创建Document对象
			Document doc=null;
			for(int i=0;i<ids.length;i++){
				doc=new Document();
				// 4.为Document添加Field
				doc.add(new Field("id",ids[i],Field.Store.YES,Field.Index.NOT_ANALYZED_NO_NORMS));
			    doc.add(new Field("emails",emails[i],Field.Store.YES,Field.Index.NOT_ANALYZED_NO_NORMS));
			    doc.add(new Field("contents",contents[i],Field.Store.NO,Field.Index.NOT_ANALYZED));
			    doc.add(new Field("names",names[i],Field.Store.YES,Field.Index.NOT_ANALYZED_NO_NORMS));
				// 4通过IndexWriter 添加文档到索引中
			    writer.addDocument(doc);
			}
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally {

			if (writer != null) {
        
				try {
					// 关闭流
					writer.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}

	}
    
}

以上内容主要是回顾创建索引---》怎么设置域--》查询索引

还有域存储   域索引的概念

查询的时候用IndexReader：

IndexReader reader = IndexReader.open(directory);

举一反三：在上一节中的HelloLucene中， 

  doc.add(new Field("content", new FileReader(file)));

对于这行代码，内容默认的是没有域存储选项，那么我怎么实现将内容存储到域存储中去呢？

传统方法Reader----->BufferReader,现在我们这样用：

加载jar包： commons-io-2.4.jar

利用工具类，先转换为字符串就OK，其它步骤和id，path一样存储实现的。

String content=FileUtils.readFileToString(file);
System.out.println(content);