把其他格式转化为lucene需要的document．式
document．doc = new
document．); //每一个doc相当于数据库的一条记录
doc.add(new Field("uid", line.getUid().toString(),
Store.YES,Index.NO)); //每一个field，相当于数据库的字段
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．); //每一个doc相当于数据库的一条记录
doc.add(new Field("uid", line.getUid().toString(),
Store.YES,Index.NO)); //每一个field，相当于数据库的字段
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，可以插入多条doc
writer.adddocument．doc);
writer.adddocument．doc2);
writer.adddocument．doc3);
writer.adddocument．doc);
writer.adddocument．doc2);
writer.adddocument．doc3);
开始写入（close的时候为实际写入过程）
writer.close();
writer = null;
writer.close();
writer = null;
读取写入的索引数
writer.numDocs()
writer.maxDoc()
writer.numDocs()
writer.maxDoc()
在close之前可以进行优化（不建议在建立索引时候使用）
writer.optimize()
2、清空索引
Directory directory = new SimpleFSDirectory(new File(path),new
SimpleFSLockFactory());
IndexWriter.unlock(directory); //关键是这一步要进行目录解锁，这里解的是write.lock锁
IndexWriter writer = new IndexWriter(directory,new WhitespaceAnalyzer(),
false,IndexWriter.MaxFieldLength.LIMITED);
writer.deleteAll(); //标识删除全部
writer.optimize(); //这个步骤才是实际删除的过程
writer.close();
Directory directory = new SimpleFSDirectory(new File(path),new
SimpleFSLockFactory());
IndexWriter.unlock(directory); //关键是这一步要进行目录解锁，这里解的是write.lock锁
IndexWriter writer = new IndexWriter(directory,new WhitespaceAnalyzer(),
false,IndexWriter.MaxFieldLength.LIMITED);
writer.deleteAll(); //标识删除全部
writer.optimize(); //这个步骤才是实际删除的过程
writer.close();
3、删除指定索引（和清空差不多）
writer.deletedocument．(new Term("uri", uri)); //这里是删除term满足条件的一条或多条
writer.deletedocument．(query); //这里是删除一个查询出来的内容
writer.deletedocument．(new Term("uri", uri)); //这里是删除term满足条件的一条或多条
writer.deletedocument．(query); //这里是删除一个查询出来的内容
4、更新索引
就是先删除再添加的过程，没有直接update的办法
5、读取建立的索引分词
TermEnum terms = indexReader.terms(new Term(index, ""));
Term term = terms.term(); //获取一条索引
term().field(); //获取索引的field（字段名）
term().text(); //获取索引的值
TermEnum terms = indexReader.terms(new Term(index, ""));
Term term = terms.term(); //获取一条索引
term().field(); //获取索引的field（字段名）
term().text(); //获取索引的值
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);
创建查询条件（这里建一个最复杂的，根据多个限定条件查找，并
且有的限定条件放在多个field中查找，有精确限定和范围限定）
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是把关键字分别在title和content中匹配！
query2 = new TermQuery(new Term("startgui", params.get("startgui")));
bQuery.add(query2, Occur.MUST); //query2是精确匹配
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是按范围匹配
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是把关键字分别在title和content中匹配！
query2 = new TermQuery(new Term("startgui", params.get("startgui")));
bQuery.add(query2, Occur.MUST); //query2是精确匹配
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是按范围匹配
排序情况
SortField[] sortField = new
SortField[] { SortField.FIELD_SCORE,new SortField(null, SortField.DOC,
true) }; // 默认排序
SortField sortPriceField = new SortField("sortPrice",SortField.LONG,
sortPrice);
sortField = new SortField[] { sortPriceField,SortField.FIELD_SCORE,new
SortField(null, SortField.DOC, true) }; //按自定义价格排序
SortField[] sortField = new SortField[] { SortField.FIELD_SCORE,new
SortField(null, SortField.DOC, true) }; // 默认排序
SortField sortPriceField = new SortField("sortPrice",SortField.LONG,
sortPrice);
sortField = new SortField[] { sortPriceField,SortField.FIELD_SCORE,new
SortField(null, SortField.DOC, true) }; //按自定义价格排序
2.9最新查询方式，只是获取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;
加入分页
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);
}
循环解析docList中的document．取所需要的值
doc.get("title");
...
7、关于分词
注意建立索引和搜索时候的analyzer必须一致，而且建立索引和搜索时候目录也要保持一致
lucene自带的一些分词器
StandardAnalyzer()
会按空格和标点符号划分
WhitespaceAnalyzer() 会按空格划分
中文分词这里使用的是paoding的中文分词
是先按词库划分，当词库中不存在时按二分法进行划分