对于IndexReader而言，反复使用Index.open打开会有很大的开销，所以一般在整个程序的生命周期中只会打开一个IndexReader,通过这个IndexReader来创建不同的IndexSearcher,如果使用单例模式，可能出现的问题有：

1、当使用Writer修改了索引之后不会更新信息，所以需要使用IndexReader.openIfChange方法操作

如果IndexWriter在创建完成之后，没有关闭，需要进行commit操作之后才能提交

public IndexSearcher getSearcher() {try {if(reader==null) {reader = IndexReader.open(directory);} else {IndexReader tr = IndexReader.openIfChanged(reader);if(tr!=null) {reader.close();reader = tr;}}return new IndexSearcher(reader);} catch (CorruptIndexException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return null;}

2、TermQuery查询

public void searchByTerm(String field,String name,int num) {try {IndexSearcher searcher = getSearcher();Query query = new TermQuery(new Term(field,name));TopDocs tds = searcher.search(query, num);System.out.println("一共查询了:"+tds.totalHits);for(ScoreDoc sd:tds.scoreDocs) {Document doc = searcher.doc(sd.doc);System.out.println(doc.get("id")+"---->"+doc.get("name")+"["+doc.get("email")+"]-->"+doc.get("id")+","+doc.get("attach")+","+doc.get("date"));}searcher.close();} catch (CorruptIndexException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}//测试方法@Testpublic void searchByTerm() {su.searchByTerm("content","i",3);}

3、TermRangeQuery查询

public void searchByTermRange(String field,String start,String end,int num) {try {IndexSearcher searcher = getSearcher();Query query = new TermRangeQuery(field,start,end,true, true);TopDocs tds = searcher.search(query, num);System.out.println("一共查询了:"+tds.totalHits);for(ScoreDoc sd:tds.scoreDocs) {Document doc = searcher.doc(sd.doc);System.out.println(doc.get("id")+"---->"+doc.get("name")+"["+doc.get("email")+"]-->"+doc.get("id")+","+doc.get("attach")+","+doc.get("date"));}searcher.close();} catch (CorruptIndexException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}//测试方法@Testpublic void searchByTermRange() {//查询name以a开头和s结尾的su.searchByTermRange("name","a","s",10);//由于attachs是数字类型，使用TermRange无法查询//su.searchByTermRange("attach","2","10", 5);}

4、NumericRangeQuery查询

public void searchByNumricRange(String field,int start,int end,int num) {try {IndexSearcher searcher = getSearcher();Query query = NumericRangeQuery.newIntRange(field,start, end,true,true);TopDocs tds = searcher.search(query, num);System.out.println("一共查询了:"+tds.totalHits);for(ScoreDoc sd:tds.scoreDocs) {Document doc = searcher.doc(sd.doc);System.out.println(doc.get("id")+"---->"+doc.get("name")+"["+doc.get("email")+"]-->"+doc.get("id")+","+doc.get("attach")+","+doc.get("date"));}searcher.close();} catch (CorruptIndexException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}  //测试方法@Testpublic void searchByNumRange() {su.searchByNumricRange("attach",2,10, 5);}

5、PrefixQuery查询

public void searchByPrefix(String field,String value,int num) {try {IndexSearcher searcher = getSearcher();Query query = new PrefixQuery(new Term(field,value));TopDocs tds = searcher.search(query, num);System.out.println("一共查询了:"+tds.totalHits);for(ScoreDoc sd:tds.scoreDocs) {Document doc = searcher.doc(sd.doc);System.out.println(doc.get("id")+"---->"+doc.get("name")+"["+doc.get("email")+"]-->"+doc.get("id")+","+doc.get("attach")+","+doc.get("date"));}searcher.close();} catch (CorruptIndexException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}//测试方法@Testpublic void searchByPrefix() {su.searchByPrefix("content", "s", 10);}

注：我们在添加索引的时候的content是Field.Store.NO的

doc.add(new Field("content",contents[i],Field.Store.NO,Field.Index.ANALYZED));

6、WildcardQuery查询

public void searchByWildcard(String field,String value,int num) {try {IndexSearcher searcher = getSearcher();//在传入的value中可以使用通配符:?和*,?表示匹配一个字符，*表示匹配任意多个字符Query query = new WildcardQuery(new Term(field,value));TopDocs tds = searcher.search(query, num);System.out.println("一共查询了:"+tds.totalHits);for(ScoreDoc sd:tds.scoreDocs) {Document doc = searcher.doc(sd.doc);System.out.println(doc.get("id")+"---->"+doc.get("name")+"["+doc.get("email")+"]-->"+doc.get("id")+","+doc.get("attach")+","+doc.get("date"));}searcher.close();} catch (CorruptIndexException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}    //测试方法@Testpublic void searchByWildcard() {//匹配@itat.org结尾的所有字符su.searchByWildcard("email", "*@itat.org", 10);System.out.println("=======================================");//匹配j开头的有三个字符的namesu.searchByWildcard("name", "j???", 10);}

7、BooleanQuery查询

public void searchByBoolean(int num) {try {IndexSearcher searcher = getSearcher();BooleanQuery query = new BooleanQuery();/** BooleanQuery可以连接多个子查询* Occur.MUST表示必须出现* Occur.SHOULD表示可以出现* Occur.MUSE_NOT表示不能出现*/query.add(new TermQuery(new Term("name","zhangsan")), Occur.MUST_NOT);query.add(new TermQuery(new Term("content","game")),Occur.SHOULD);TopDocs tds = searcher.search(query, num);System.out.println("一共查询了:"+tds.totalHits);for(ScoreDoc sd:tds.scoreDocs) {Document doc = searcher.doc(sd.doc);System.out.println(doc.get("id")+"---->"+doc.get("name")+"["+doc.get("email")+"]-->"+doc.get("id")+","+doc.get("attach")+","+doc.get("date"));}searcher.close();} catch (CorruptIndexException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}//测试方法@Testpublic void searchByBoolean() {su.searchByBoolean(10);}

将query.add(new TermQuery(new Term("name","zhangsan")), Occur.MUST_NOT);设置为query.add(new TermQuery(new Term("name","zhangsan")), Occur.SHOULD);

8、PhraseQuery查询

private String[] contents = {"welcome to visited the space,I like book","hello boy, I like pingpeng ball","my name is cc I like game","I like football","I like football and I like basketball too","I like movie and swim"};

public void searchByPhrase(int num) {try {IndexSearcher searcher = getSearcher();PhraseQuery query = new PhraseQuery();query.setSlop(3);query.add(new Term("content","pingpeng"));//第一个Termquery.add(new Term("content","i"));//产生距离之后的第二个TermTopDocs tds = searcher.search(query, num);System.out.println("一共查询了:"+tds.totalHits);for(ScoreDoc sd:tds.scoreDocs) {Document doc = searcher.doc(sd.doc);System.out.println(doc.get("id")+"---->"+doc.get("name")+"["+doc.get("email")+"]-->"+doc.get("id")+","+doc.get("attach")+","+doc.get("date"));}searcher.close();} catch (CorruptIndexException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}//测试方法@Testpublic void searchByPhrase() {su.searchByPhrase(10);}

9、FuzzyQuery查询

public void searchByFuzzy(int num) {try {IndexSearcher searcher = getSearcher();FuzzyQuery query = new FuzzyQuery(new Term("name","mase"),0.4f,0);System.out.println(query.getPrefixLength());System.out.println(query.getMinSimilarity());TopDocs tds = searcher.search(query, num);System.out.println("一共查询了:"+tds.totalHits);for(ScoreDoc sd:tds.scoreDocs) {Document doc = searcher.doc(sd.doc);System.out.println(doc.get("id")+"---->"+doc.get("name")+"["+doc.get("email")+"]-->"+doc.get("id")+","+doc.get("attach")+","+doc.get("date"));}searcher.close();} catch (CorruptIndexException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}//测试方法@Testpublic void searchByFuzzy() {su.searchByFuzzy(10);}

10、QueryParse查询

public void searchByQueryParse(Query query,int num) {try {IndexSearcher searcher = getSearcher();TopDocs tds = searcher.search(query, num);System.out.println("一共查询了:"+tds.totalHits);for(ScoreDoc sd:tds.scoreDocs) {Document doc = searcher.doc(sd.doc);System.out.println(doc.get("id")+"---->"+doc.get("name")+"["+doc.get("email")+"]-->"+doc.get("id")+","+doc.get("attach")+","+doc.get("date")+"=="+sd.score);}searcher.close();} catch (CorruptIndexException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}//测试方法 @Testpublic void searchByQueryParse() throws ParseException {//1、创建QueryParser对象,默认搜索域为contentQueryParser parser = new QueryParser(Version.LUCENE_35, "content", new StandardAnalyzer(Version.LUCENE_35));//改变空格的默认操作符，以下可以改成AND//parser.setDefaultOperator(Operator.AND);//开启第一个字符的通配符匹配，默认关闭因为效率不高parser.setAllowLeadingWildcard(true);//搜索content中包含有like的Query query = parser.parse("like");//有basketball或者football的，空格默认就是ORquery = parser.parse("basketball football");//改变搜索域为name为mike//query = parser.parse("content:like");//同样可以使用*和?来进行通配符匹配
//      query = parser.parse("name:j*");//通配符默认不能放在首位
//      query = parser.parse("email:*@itat.org");//匹配name中没有mike但是content中必须有football的，+和-要放置到域说明前面query = parser.parse("- name:mike + like");//匹配一个区间，注意:TO必须是大写//query = parser.parse("id:[1 TO 6]");//闭区间匹配只会匹配到2//query = parser.parse("id:{1 TO 3}");//完全匹配I Like Football的//query = parser.parse("\"I like football\"");//匹配I 和football之间有一个单词距离的//query = parser.parse("\"I football\"~1");//模糊查询//query = parser.parse("name:make~");//没有办法匹配数字范围（自己扩展Parser）//query = parser.parse("attach:[2 TO 10]");su.searchByQueryParse(query, 10);}

11、分页查询

/*** 根据页码和分页大小获取上一次的最后一个ScoreDoc*/private ScoreDoc getLastScoreDoc(int pageIndex,int pageSize,Query query,IndexSearcher searcher) throws IOException {if(pageIndex==1)return null;//如果是第一页就返回空int num = pageSize*(pageIndex-1);//获取上一页的数量TopDocs tds = searcher.search(query, num);return tds.scoreDocs[num-1];}

public void searchPageByAfter(String query,int pageIndex,int pageSize) {try {Directory dir = FileIndexUtils.getDirectory();IndexSearcher searcher = getSearcher(dir);QueryParser parser = new QueryParser(Version.LUCENE_35,"content",new StandardAnalyzer(Version.LUCENE_35));Query q = parser.parse(query);//先获取上一页的最后一个元素ScoreDoc lastSd = getLastScoreDoc(pageIndex, pageSize, q, searcher);//通过最后一个元素搜索下页的pageSize个元素TopDocs tds = searcher.searchAfter(lastSd,q, pageSize);for(ScoreDoc sd:tds.scoreDocs) {Document doc = searcher.doc(sd.doc);System.out.println(sd.doc+":"+doc.get("path")+"-->"+doc.get("filename"));}searcher.close();} catch (org.apache.lucene.queryParser.ParseException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}

@Testpublic void testSearchPage02() {for(int i=1;i<7;i++){su.searchPageByAfter("java", i,10);System.out.println("==========================================");}}