把其他格式轉(zhuǎn)化為lucene需要的document．式

document．doc = new document．);  //每一個doc相當于數(shù)據(jù)庫的一條記錄   
doc.add(new Field("uid", line.getUid().toString(), Store.YES,Index.NO));  //每一個field，相當于數(shù)據(jù)庫的字段   
  
doc.add(new Field("title", line.getTitle(), Store.NO,Index.ANALYZED));    
doc.add(new Field("content", line.getContent(),Store.NO, Index.ANALYZED));   
document．doc = new document．);  //每一個doc相當于數(shù)據(jù)庫的一條記錄
doc.add(new Field("uid", line.getUid().toString(), Store.YES,Index.NO));  //每一個field，相當于數(shù)據(jù)庫的字段

doc.add(new Field("title", line.getTitle(), Store.NO,Index.ANALYZED)); 
doc.add(new Field("content", line.getContent(),Store.NO, Index.ANALYZED)); 

向IndexWriter添加doc，可以插入多條doc

writer.adddocument．doc);   
writer.adddocument．doc2);   
writer.adddocument．doc3);  
writer.adddocument．doc);
writer.adddocument．doc2);
writer.adddocument．doc3);

開始寫入（close的時候為實際寫入過程）

writer.close();   
writer = null;  
writer.close();
writer = null;

讀取寫入的索引數(shù)

writer.numDocs()   
writer.maxDoc()  
writer.numDocs()
writer.maxDoc()

在close之前可以進行優(yōu)化（不建議在建立索引時候使用）

writer.optimize()

2、清空索引
Directory directory = new SimpleFSDirectory(new File(path),new SimpleFSLockFactory());   
IndexWriter.unlock(directory);  //關(guān)鍵是這一步要進行目錄解鎖，這里解的是write.lock鎖   
IndexWriter writer = new IndexWriter(directory,new WhitespaceAnalyzer(), false,IndexWriter.MaxFieldLength.LIMITED);   
writer.deleteAll();  //標識刪除全部   
writer.optimize();  //這個步驟才是實際刪除的過程   
writer.close();   
Directory directory = new SimpleFSDirectory(new File(path),new SimpleFSLockFactory());
IndexWriter.unlock(directory);  //關(guān)鍵是這一步要進行目錄解鎖，這里解的是write.lock鎖
IndexWriter writer = new IndexWriter(directory,new WhitespaceAnalyzer(), false,IndexWriter.MaxFieldLength.LIMITED);
writer.deleteAll();  //標識刪除全部
writer.optimize();  //這個步驟才是實際刪除的過程
writer.close(); 

3、刪除指定索引（和清空差不多）
writer.deletedocument．(new Term("uri", uri));  //這里是刪除term滿足條件的一條或多條   
writer.deletedocument．(query); //這里是刪除一個查詢出來的內(nèi)容  
writer.deletedocument．(new Term("uri", uri));  //這里是刪除term滿足條件的一條或多條
writer.deletedocument．(query); //這里是刪除一個查詢出來的內(nèi)容

4、更新索引
就是先刪除再添加的過程，沒有直接update的辦法

5、讀取建立的索引分詞
TermEnum terms = indexReader.terms(new Term(index, ""));   
Term term = terms.term();  //獲取一條索引   
term().field(); //獲取索引的field（字段名）   
term().text(); //獲取索引的值  
TermEnum terms = indexReader.terms(new Term(index, ""));
Term term = terms.term();  //獲取一條索引
term().field(); //獲取索引的field（字段名）
term().text(); //獲取索引的值

6、搜索
最新2.9的IndexSearcher 建立方式：

Directory directory = new SimpleFSDirectory(new File(path),new SimpleFSLockFactory());   
IndexSearcher indexSearcher = new IndexSearcher(directory, true);  
Directory directory = new SimpleFSDirectory(new File(path),new SimpleFSLockFactory());
IndexSearcher indexSearcher = new IndexSearcher(directory, true);

創(chuàng)建查詢條件（這里建一個最復(fù)雜的，根據(jù)多個限定條件查找，并 且有的限定條件放在多個field中查找，有精確限定和范圍限定）

BooleanQuery bQuery = new BooleanQuery();   
Query query1 = null, query2 = null, query3 = null;   
BooleanClause.Occur[] flags = new BooleanClause.Occur[] {BooleanClause.Occur.SHOULD, BooleanClause.Occur.SHOULD };   
query1 = MultiFieldQueryParser.parse(params.get("keywords"),new String[] { "title", "content" }, flags, new WhitespaceAnalyzer());   
bQuery.add(query1, Occur.MUST); //query1是把關(guān)鍵字分別在title和content中匹配！   
query2 = new TermQuery(new Term("startgui", params.get("startgui")));   
bQuery.add(query2, Occur.MUST); //query2是精確匹配   
Long minPriceLong = Long.parseLong(params.get("minPrice"));   
Long maxPriceLong = Long.parseLong(params.get("maxPrice"));   
query5 = NumericRangeQuery.newLongRange("price", minPriceLong,   
maxPriceLong, true, true);   
bQuery.add(query5, Occur.MUST);  //query3是按范圍匹配  
BooleanQuery bQuery = new BooleanQuery();
Query query1 = null, query2 = null, query3 = null;
BooleanClause.Occur[] flags = new BooleanClause.Occur[] {BooleanClause.Occur.SHOULD, BooleanClause.Occur.SHOULD };
query1 = MultiFieldQueryParser.parse(params.get("keywords"),new String[] { "title", "content" }, flags, new WhitespaceAnalyzer());
bQuery.add(query1, Occur.MUST); //query1是把關(guān)鍵字分別在title和content中匹配！
query2 = new TermQuery(new Term("startgui", params.get("startgui")));
bQuery.add(query2, Occur.MUST); //query2是精確匹配
Long minPriceLong = Long.parseLong(params.get("minPrice"));
Long maxPriceLong = Long.parseLong(params.get("maxPrice"));
query5 = NumericRangeQuery.newLongRange("price", minPriceLong,
maxPriceLong, true, true);
bQuery.add(query5, Occur.MUST);  //query3是按范圍匹配
 

排序情況

SortField[] sortField = new SortField[] { SortField.FIELD_SCORE,new SortField(null, SortField.DOC, true) }; // 默認排序   
SortField sortPriceField = new SortField("sortPrice",SortField.LONG, sortPrice);   
sortField = new SortField[] { sortPriceField,SortField.FIELD_SCORE,new SortField(null, SortField.DOC, true) };  //按自定義價格排序  
SortField[] sortField = new SortField[] { SortField.FIELD_SCORE,new SortField(null, SortField.DOC, true) }; // 默認排序
SortField sortPriceField = new SortField("sortPrice",SortField.LONG, sortPrice);
sortField = new SortField[] { sortPriceField,SortField.FIELD_SCORE,new SortField(null, SortField.DOC, true) };  //按自定義價格排序
 

2.9最新查詢方式，只是獲取id

TopFieldDocs docs = indexSearcher.search(query, null, indexSearcher.maxDoc(), new Sort(sortField));   
ScoreDoc[] scoreDocs = docs.scoreDocs;   
docCount = scoreDocs.length;   
TopFieldDocs docs = indexSearcher.search(query, null, indexSearcher.maxDoc(), new Sort(sortField));
ScoreDoc[] scoreDocs = docs.scoreDocs;
docCount = scoreDocs.length; 

加入分頁

List<document．gt; docList = new ArrayList<document．gt;();   
int max = ((startIndex + pageSize) >= docCount) ? docCount : (startIndex + pageSize); // max防止arrayindexoutofbounds   
for (int i = startIndex; i < max; i++) {    
    ScoreDoc scoredoc = scoreDocs[i];   
    document．doc = indexSearcher.doc(scoredoc.doc); // 新的使用方法   
    docList.add(doc);   
}  
List<document．gt; docList = new ArrayList<document．gt;();
int max = ((startIndex + pageSize) >= docCount) ? docCount : (startIndex + pageSize); // max防止arrayindexoutofbounds
for (int i = startIndex; i < max; i++) { 
 ScoreDoc scoredoc = scoreDocs[i];
 document．doc = indexSearcher.doc(scoredoc.doc); // 新的使用方法
 docList.add(doc);
}
 

循環(huán)解析docList中的document．取所需要的值

doc.get("title");

...

7、關(guān)于分詞
注意建立索引和搜索時候的analyzer必須一致，而且建立索引和搜索時候目錄也要保持一致

lucene自帶的一些分詞器

StandardAnalyzer() 會按空格和標點符號劃分

WhitespaceAnalyzer() 會按空格劃分

中文分詞這里使用的是paoding的中文分詞

是先按詞庫劃分，當詞庫中不存在時按二分法進行劃分