花了整整一天时间，将Lucene5中有关索引的常见操作进行了简单封装，废话不多说，上代码：
package com.yida.framework.lucene5.util;
import java.io.IOException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
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.search.IndexSearcher;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.LockObtainFailedException;
/**
* Lucene索引读写器/查询器单例获取工具类
* @author Lanxiaowei
*
*/
public class LuceneManager {
private volatile static LuceneManager singleton;
private volatile static IndexWriter writer;
private volatile static IndexReader reader;
private volatile static IndexSearcher searcher;
private final Lock writerLock = new ReentrantLock();
//private final Lock readerLock = new ReentrantLock();
//private final Lock searcherLock = new ReentrantLock();
private LuceneManager() {}
public static LuceneManager getInstance() {
if (null == singleton) {
synchronized (LuceneManager.class) {
if (null == singleton) {
singleton = new LuceneManager();
}
}
}
return singleton;
}
/**
* 获取IndexWriter单例对象
* @param dir
* @param config
* @return
*/
public IndexWriter getIndexWriter(Directory dir, IndexWriterConfig config) {
if(null == dir) {
throw new IllegalArgumentException("Directory can not be null.");
}
if(null == config) {
throw new IllegalArgumentException("IndexWriterConfig can not be null.");
}
try {
writerLock.lock();
if(null == writer){
//如果索引目录被锁，则直接抛异常
if(IndexWriter.isLocked(dir)) {
throw new LockObtainFailedException("Directory of index had been locked.");
}
writer = new IndexWriter(dir, config);
}
} catch (LockObtainFailedException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
writerLock.unlock();
}
return writer;
}
/**
* 获取IndexReader对象
* @param dir
* @param enableNRTReader 是否开启NRTReader
* @return
*/
public IndexReader getIndexReader(Directory dir,boolean enableNRTReader) {
if(null == dir) {
throw new IllegalArgumentException("Directory can not be null.");
}
try {
if(null == reader){
reader = DirectoryReader.open(dir);
} else {
if(enableNRTReader && reader instanceof DirectoryReader) {
//开启近实时Reader,能立即看到动态添加/删除的索引变化
reader = DirectoryReader.openIfChanged((DirectoryReader)reader);
}
}
} catch (IOException e) {
e.printStackTrace();
}
return reader;
}
/**
* 获取IndexReader对象(默认不启用NETReader)
* @param dir
* @return
*/
public IndexReader getIndexReader(Directory dir) {
return getIndexReader(dir, false);
}
/**
* 获取IndexSearcher对象
* @param reader IndexReader对象实例
* @param executor 如果你需要开启多线程查询，请提供ExecutorService对象参数
* @return
*/
public IndexSearcher getIndexSearcher(IndexReader reader,ExecutorService executor) {
if(null == reader) {
throw new IllegalArgumentException("The indexReader can not be null.");
}
if(null == searcher){
searcher = new IndexSearcher(reader);
}
return searcher;
}
/**
* 获取IndexSearcher对象(不支持多线程查询)
* @param reader IndexReader对象实例
* @return
*/
public IndexSearcher getIndexSearcher(IndexReader reader) {
return getIndexSearcher(reader, null);
}
}
package com.yida.framework.lucene5.util;
import java.io.IOException;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import java.util.concurrent.ExecutorService;
import org.ansj.lucene5.AnsjAnalyzer;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.TextField;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.IndexableField;
import org.apache.lucene.index.Term;
import org.apache.lucene.queryparser.classic.QueryParser;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.search.highlight.Formatter;
import org.apache.lucene.search.highlight.Fragmenter;
import org.apache.lucene.search.highlight.Highlighter;
import org.apache.lucene.search.highlight.InvalidTokenOffsetsException;
import org.apache.lucene.search.highlight.QueryScorer;
import org.apache.lucene.search.highlight.Scorer;
import org.apache.lucene.search.highlight.SimpleFragmenter;
import org.apache.lucene.search.highlight.SimpleHTMLFormatter;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
/**
* Lucene工具类(基于Lucene5.0封装)
* @author Lanxiaowei
*
*/
public class LuceneUtils {
private static final LuceneManager luceneManager = LuceneManager.getInstance();
private static Analyzer analyzer = new AnsjAnalyzer();
/**
* 打开索引目录
*
* @param luceneDir
* @return
* @throws IOException
*/
public static FSDirectory openFSDirectory(String luceneDir) {
FSDirectory directory = null;
try {
directory = FSDirectory.open(Paths.get(luceneDir));
/**
* 注意：isLocked方法内部会试图去获取Lock,如果获取到Lock，会关闭它，否则return false表示索引目录没有被锁，
* 这也就是为什么unlock方法被从IndexWriter类中移除的原因
*/
IndexWriter.isLocked(directory);
} catch (IOException e) {
e.printStackTrace();
}
return directory;
}
/**
* 关闭索引目录并销毁
* @param directory
* @throws IOException
*/
public static void closeDirectory(Directory directory) throws IOException {
if (null != directory) {
directory.close();
directory = null;
}
}
/**
* 获取IndexWriter
* @param dir
* @param config
* @return
*/
public static IndexWriter getIndexWrtier(Directory dir, IndexWriterConfig config) {
return luceneManager.getIndexWriter(dir, config);
}
/**
* 获取IndexWriter
* @param dir
* @param config
* @return
*/
public static IndexWriter getIndexWrtier(String directoryPath, IndexWriterConfig config) {
FSDirectory directory = openFSDirectory(directoryPath);
return luceneManager.getIndexWriter(directory, config);
}
/**
* 获取IndexReader
* @param dir
* @param enableNRTReader 是否开启NRTReader
* @return
*/
public static IndexReader getIndexReader(Directory dir,boolean enableNRTReader) {
return luceneManager.getIndexReader(dir, enableNRTReader);
}
/**
* 获取IndexReader(默认不启用NRTReader)
* @param dir
* @return
*/
public static IndexReader getIndexReader(Directory dir) {
return luceneManager.getIndexReader(dir);
}
/**
* 获取IndexSearcher
* @param reader IndexReader对象
* @param executor 如果你需要开启多线程查询，请提供ExecutorService对象参数
* @return
*/
public static IndexSearcher getIndexSearcher(IndexReader reader,ExecutorService executor) {
return luceneManager.getIndexSearcher(reader, executor);
}
/**
* 获取IndexSearcher(不支持多线程查询)
* @param reader IndexReader对象
* @return
*/
public static IndexSearcher getIndexSearcher(IndexReader reader) {
return luceneManager.getIndexSearcher(reader);
}
/**
* 创建QueryParser对象
* @param field
* @param analyzer
* @return
*/
public static QueryParser createQueryParser(String field, Analyzer analyzer) {
return new QueryParser(field, analyzer);
}
/**
* 关闭IndexReader
* @param reader
*/
public static void closeIndexReader(IndexReader reader) {
if (null != reader) {
try {
reader.close();
reader = null;
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 关闭IndexWriter
* @param writer
*/
public static void closeIndexWriter(IndexWriter writer) {
if(null != writer) {
try {
writer.close();
writer = null;
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 关闭IndexReader和IndexWriter
* @param reader
* @param writer
*/
public static void closeAll(IndexReader reader, IndexWriter writer) {
closeIndexReader(reader);
closeIndexWriter(writer);
}
/**
* 删除索引[注意：请自己关闭IndexWriter对象]
* @param writer
* @param field
* @param value
*/
public static void deleteIndex(IndexWriter writer, String field, String value) {
try {
writer.deleteDocuments(new Term[] {new Term(field,value)});
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 删除索引[注意：请自己关闭IndexWriter对象]
* @param writer
* @param query
*/
public static void deleteIndex(IndexWriter writer, Query query) {
try {
writer.deleteDocuments(query);
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 批量删除索引[注意：请自己关闭IndexWriter对象]
* @param writer
* @param terms
*/
public static void deleteIndexs(IndexWriter writer,Term[] terms) {
try {
writer.deleteDocuments(terms);
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 批量删除索引[注意：请自己关闭IndexWriter对象]
* @param writer
* @param querys
*/
public static void deleteIndexs(IndexWriter writer,Query[] querys) {
try {
writer.deleteDocuments(querys);
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 删除所有索引文档
* @param writer
*/
public static void deleteAllIndex(IndexWriter writer) {
try {
writer.deleteAll();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 更新索引文档
* @param writer
* @param term
* @param document
*/
public static void updateIndex(IndexWriter writer,Term term,Document document) {
try {
writer.updateDocument(term, document);
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 更新索引文档
* @param writer
* @param term
* @param document
*/
public static void updateIndex(IndexWriter writer,String field,String value,Document document) {
updateIndex(writer, new Term(field, value), document);
}
/**
* 添加索引文档
* @param writer
* @param doc
*/
public static void addIndex(IndexWriter writer, Document document) {
updateIndex(writer, null, document);
}
/**
* 索引文档查询
* @param searcher
* @param query
* @return
*/
public static List<Document> query(IndexSearcher searcher,Query query) {
TopDocs topDocs = null;
try {
topDocs = searcher.search(query, Integer.MAX_VALUE);
} catch (IOException e) {
e.printStackTrace();
}
ScoreDoc[] scores = topDocs.scoreDocs;
int length = scores.length;
if (length <= 0) {
return Collections.emptyList();
}
List<Document> docList = new ArrayList<Document>();
try {
for (int i = 0; i < length; i++) {
Document doc = searcher.doc(scores[i].doc);
docList.add(doc);
}
} catch (IOException e) {
e.printStackTrace();
}
return docList;
}
/**
* 返回索引文档的总数[注意：请自己手动关闭IndexReader]
* @param reader
* @return
*/
public static int getIndexTotalCount(IndexReader reader) {
return reader.numDocs();
}
/**
* 返回索引文档中最大文档ID[注意：请自己手动关闭IndexReader]
* @param reader
* @return
*/
public static int getMaxDocId(IndexReader reader) {
return reader.maxDoc();
}
/**
* 返回已经删除尚未提交的文档总数[注意：请自己手动关闭IndexReader]
* @param reader
* @return
*/
public static int getDeletedDocNum(IndexReader reader) {
return getMaxDocId(reader) - getIndexTotalCount(reader);
}
/**
* 根据docId查询索引文档
* @param reader IndexReader对象
* @param docID documentId
* @param fieldsToLoad 需要返回的field
* @return
*/
public static Document findDocumentByDocId(IndexReader reader,int docID, Set<String> fieldsToLoad) {
try {
return reader.document(docID, fieldsToLoad);
} catch (IOException e) {
return null;
}
}
/**
* 根据docId查询索引文档
* @param reader IndexReader对象
* @param docID documentId
* @return
*/
public static Document findDocumentByDocId(IndexReader reader,int docID) {
return findDocumentByDocId(reader, docID, null);
}
/**
* @Title: createHighlighter
* @Description: 创建高亮器
* @param query 索引查询对象
* @param prefix 高亮前缀字符串
* @param stuffix 高亮后缀字符串
* @param fragmenterLength 摘要最大长度
* @return
*/
public static Highlighter createHighlighter(Query query, String prefix, String stuffix, int fragmenterLength) {
Formatter formatter = new SimpleHTMLFormatter((prefix == null || prefix.trim().length() == 0) ?
"<font color=\"red\">" : prefix, (stuffix == null || stuffix.trim().length() == 0)?"</font>" : stuffix);
Scorer fragmentScorer = new QueryScorer(query);
Highlighter highlighter = new Highlighter(formatter, fragmentScorer);
Fragmenter fragmenter = new SimpleFragmenter(fragmenterLength <= 0 ? 50 : fragmenterLength);
highlighter.setTextFragmenter(fragmenter);
return highlighter;
}
/**
* @Title: highlight
* @Description: 生成高亮文本
* @param document 索引文档对象
* @param highlighter 高亮器
* @param analyzer 索引分词器
* @param field 高亮字段
* @return
* @throws IOException
* @throws InvalidTokenOffsetsException
*/
public static String highlight(Document document,Highlighter highlighter,Analyzer analyzer,String field) throws IOException {
List<IndexableField> list = document.getFields();
for (IndexableField fieldable : list) {
String fieldValue = fieldable.stringValue();
if(fieldable.name().equals(field)) {
try {
fieldValue = highlighter.getBestFragment(analyzer, field, fieldValue);
} catch (InvalidTokenOffsetsException e) {
fieldValue = fieldable.stringValue();
}
return (fieldValue == null || fieldValue.trim().length() == 0)? fieldable.stringValue() : fieldValue;
}
}
return null;
}
/**
* @Title: searchTotalRecord
* @Description: 获取符合条件的总记录数
* @param query
* @return
* @throws IOException
*/
public static int searchTotalRecord(IndexSearcher search,Query query) {
ScoreDoc[] docs = null;
try {
TopDocs topDocs = search.search(query, Integer.MAX_VALUE);
if(topDocs == null || topDocs.scoreDocs == null || topDocs.scoreDocs.length == 0) {
return 0;
}
docs = topDocs.scoreDocs;
} catch (IOException e) {
e.printStackTrace();
}
return docs.length;
}
/**
* @Title: pageQuery
* @Description: Lucene分页查询
* @param searcher
* @param query
* @param page
* @throws IOException
*/
public static void pageQuery(IndexSearcher searcher,Directory directory,Query query,Page<Document> page) {
int totalRecord = searchTotalRecord(searcher,query);
//设置总记录数
page.setTotalRecord(totalRecord);
TopDocs topDocs = null;
try {
topDocs = searcher.searchAfter(page.getAfterDoc(),query, page.getPageSize());
} catch (IOException e) {
e.printStackTrace();
}
List<Document> docList = new ArrayList<Document>();
ScoreDoc[] docs = topDocs.scoreDocs;
int index = 0;
for (ScoreDoc scoreDoc : docs) {
int docID = scoreDoc.doc;
Document document = null;
try {
document = searcher.doc(docID);
} catch (IOException e) {
e.printStackTrace();
}
if(index == docs.length - 1) {
page.setAfterDoc(scoreDoc);
page.setAfterDocId(docID);
}
docList.add(document);
index++;
}
page.setItems(docList);
closeIndexReader(searcher.getIndexReader());
}
/**
* @Title: pageQuery
* @Description: 分页查询[如果设置了高亮,则会更新索引文档]
* @param searcher
* @param directory
* @param query
* @param page
* @param highlighterParam
* @param writerConfig
* @throws IOException
*/
public static void pageQuery(IndexSearcher searcher,Directory directory,Query query,Page<Document> page,HighlighterParam highlighterParam,IndexWriterConfig writerConfig) throws IOException {
IndexWriter writer = null;
//若未设置高亮
if(null == highlighterParam || !highlighterParam.isHighlight()) {
pageQuery(searcher,directory,query, page);
} else {
int totalRecord = searchTotalRecord(searcher,query);
System.out.println("totalRecord:" + totalRecord);
//设置总记录数
page.setTotalRecord(totalRecord);
TopDocs topDocs = searcher.searchAfter(page.getAfterDoc(),query, page.getPageSize());
List<Document> docList = new ArrayList<Document>();
ScoreDoc[] docs = topDocs.scoreDocs;
int index = 0;
writer = getIndexWrtier(directory, writerConfig);
for (ScoreDoc scoreDoc : docs) {
int docID = scoreDoc.doc;
Document document = searcher.doc(docID);
String content = document.get(highlighterParam.getFieldName());
if(null != content && content.trim().length() > 0) {
//创建高亮器
Highlighter highlighter = LuceneUtils.createHighlighter(query,
highlighterParam.getPrefix(), highlighterParam.getStuffix(),
highlighterParam.getFragmenterLength());
String text = highlight(document, highlighter, analyzer, highlighterParam.getFieldName());
//若高亮后跟原始文本不相同，表示高亮成功
if(!text.equals(content)) {
Document tempdocument = new Document();
List<IndexableField> indexableFieldList = document.getFields();
if(null != indexableFieldList && indexableFieldList.size() > 0) {
for(IndexableField field : indexableFieldList) {
if(field.name().equals(highlighterParam.getFieldName())) {
tempdocument.add(new TextField(field.name(), text, Field.Store.YES));
} else {
tempdocument.add(field);
}
}
}
updateIndex(writer, new Term(highlighterParam.getFieldName(),content), tempdocument);
document = tempdocument;
}
}
if(index == docs.length - 1) {
page.setAfterDoc(scoreDoc);
page.setAfterDocId(docID);
}
docList.add(document);
index++;
}
page.setItems(docList);
}
closeIndexReader(searcher.getIndexReader());
closeIndexWriter(writer);
}
}
package com.yida.framework.lucene5.util;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import org.apache.lucene.document.Document;
import org.apache.lucene.search.ScoreDoc;
public class Page<T> {
/**当前第几页(从1开始计算)*/
private int currentPage;
/**每页显示几条*/
private int pageSize;
/**总记录数*/
private int totalRecord;
/**总页数*/
private int totalPage;
/**分页数据集合[用泛型T来限定集合元素类型]*/
private Collection<T> items;
/**当前显示起始索引(从零开始计算)*/
private int startIndex;
/**当前显示结束索引(从零开始计算)*/
private int endIndex;
/**一组最多显示几个页码[比如Google一组最多显示10个页码]*/
private int groupSize;
/**左边偏移量*/
private int leftOffset = 5;
/**右边偏移量*/
private int rightOffset = 4;
/**当前页码范围*/
private String[] pageRange;
/**分页数据*/
private List<Document> docList;
/**上一页最后一个ScoreDoc对象*/
private ScoreDoc afterDoc;
/**上一页最后一个ScoreDoc对象的Document对象ID*/
private int afterDocId;
public void setRangeIndex() {
int groupSize = getGroupSize();
int totalPage = getTotalPage();
if(totalPage < 2) {
startIndex = 0;
endIndex = totalPage - startIndex;
} else {
int currentPage = getCurrentPage();
if(groupSize >= totalPage) {
startIndex = 0;
endIndex = totalPage - startIndex - 1;
} else {
int leftOffset = getLeftOffset();
int middleOffset = getMiddleOffset();
if(-1 == middleOffset) {
startIndex = 0;
endIndex = groupSize - 1;
} else if(currentPage <= leftOffset) {
startIndex = 0;
endIndex = groupSize - 1;
} else {
startIndex = currentPage - leftOffset - 1;
if(currentPage + rightOffset > totalPage) {
endIndex = totalPage - 1;
} else {
endIndex = currentPage + rightOffset - 1;
}
}
}
}
}
public int getCurrentPage() {
if(currentPage <= 0) {
currentPage = 1;
} else {
int totalPage = getTotalPage();
if(totalPage > 0 && currentPage > getTotalPage()) {
currentPage = totalPage;
}
}
return currentPage;
}
public void setCurrentPage(int currentPage) {
this.currentPage = currentPage;
}
public int getPageSize() {
if(pageSize <= 0) {
pageSize = 10;
}
return pageSize;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
public int getTotalRecord() {
return totalRecord;
}
public void setTotalRecord(int totalRecord) {
this.totalRecord = totalRecord;
}
public int getTotalPage() {
int totalRecord = getTotalRecord();
if(totalRecord == 0) {
totalPage = 0;
} else {
int pageSize = getPageSize();
totalPage = totalRecord % pageSize == 0 ? totalRecord / pageSize : (totalRecord / pageSize) + 1;
}
return totalPage;
}
public void setTotalPage(int totalPage) {
this.totalPage = totalPage;
}
public int getStartIndex() {
return startIndex;
}
public void setStartIndex(int startIndex) {
this.startIndex = startIndex;
}
public int getEndIndex() {
return endIndex;
}
public void setEndIndex(int endIndex) {
this.endIndex = endIndex;
}
public int getGroupSize() {
if(groupSize <= 0) {
groupSize = 10;
}
return groupSize;
}
public void setGroupSize(int groupSize) {
this.groupSize = groupSize;
}
public int getLeftOffset() {
leftOffset = getGroupSize() / 2;
return leftOffset;
}
public void setLeftOffset(int leftOffset) {
this.leftOffset = leftOffset;
}
public int getRightOffset() {
int groupSize = getGroupSize();
if(groupSize % 2 == 0) {
rightOffset = (groupSize / 2) - 1;
} else {
rightOffset = groupSize / 2;
}
return rightOffset;
}
public void setRightOffset(int rightOffset) {
this.rightOffset = rightOffset;
}
/**中心位置索引[从1开始计算]*/
public int getMiddleOffset() {
int groupSize = getGroupSize();
int totalPage = getTotalPage();
if(groupSize >= totalPage) {
return -1;
}
return getLeftOffset() + 1;
}
public String[] getPageRange() {
setRangeIndex();
int size = endIndex - startIndex + 1;
if(size <= 0) {
return new String[0];
}
if(totalPage == 1) {
return new String[] {"1"};
}
pageRange = new String[size];
for(int i=0; i < size; i++) {
pageRange[i] = (startIndex + i + 1) + "";
}
return pageRange;
}
public void setPageRange(String[] pageRange) {
this.pageRange = pageRange;
}
public Collection<T> getItems() {
return items;
}
public void setItems(Collection<T> items) {
this.items = items;
}
public List<Document> getDocList() {
return docList;
}
public void setDocList(List<Document> docList) {
this.docList = docList;
}
public ScoreDoc getAfterDoc() {
setAfterDocId(afterDocId);
return afterDoc;
}
public void setAfterDoc(ScoreDoc afterDoc) {
this.afterDoc = afterDoc;
}
public int getAfterDocId() {
return afterDocId;
}
public void setAfterDocId(int afterDocId) {
this.afterDocId = afterDocId;
if(null == afterDoc) {
this.afterDoc = new ScoreDoc(afterDocId, 1.0f);
}
}
public Page() {}
public Page(int currentPage, int pageSize) {
this.currentPage = currentPage;
this.pageSize = pageSize;
}
public Page(int currentPage, int pageSize, Collection<T> items) {
this.currentPage = currentPage;
this.pageSize = pageSize;
this.items = items;
}
public Page(int currentPage, int pageSize, Collection<T> items, int groupSize) {
this.currentPage = currentPage;
this.pageSize = pageSize;
this.items = items;
this.groupSize = groupSize;
}
public Page(int currentPage, int pageSize, int groupSize, int afterDocId) {
this.currentPage = currentPage;
this.pageSize = pageSize;
this.groupSize = groupSize;
this.afterDocId = afterDocId;
}
public static void main(String[] args) {
Collection<Integer> items = new ArrayList<Integer>();
int totalRecord = 201;
for(int i=0; i < totalRecord; i++) {
items.add(new Integer(i));
}
Page<Integer> page = new Page<Integer>(1,10,items,10);
page.setTotalRecord(totalRecord);
int totalPage = page.getTotalPage();
for(int i=0; i < totalPage; i++) {
page.setCurrentPage(i+1);
String[] pageRange = page.getPageRange();
System.out.println("当前第" + page.currentPage + "页");
for(int j=0; j < pageRange.length; j++) {
System.out.print(pageRange[j] + " ");
}
System.out.println("\n");
}
}
}
package com.yida.framework.lucene5.util;
/**
* @ClassName: HighlighterParam
* @Description: 高亮器参数对象
* @author Lanxiaowei
* @date 2014-3-30 下午12:22:08
*/
public class HighlighterParam {
/**是否需要设置高亮*/
private boolean highlight;
/**需要设置高亮的属性名*/
private String fieldName;
/**高亮前缀*/
private String prefix;
/**高亮后缀*/
private String stuffix;
/**显示摘要最大长度*/
private int fragmenterLength;
public boolean isHighlight() {
return highlight;
}
public void setHighlight(boolean highlight) {
this.highlight = highlight;
}
public String getFieldName() {
return fieldName;
}
public void setFieldName(String fieldName) {
this.fieldName = fieldName;
}
public String getPrefix() {
return prefix;
}
public void setPrefix(String prefix) {
this.prefix = prefix;
}
public String getStuffix() {
return stuffix;
}
public void setStuffix(String stuffix) {
this.stuffix = stuffix;
}
public int getFragmenterLength() {
return fragmenterLength;
}
public void setFragmenterLength(int fragmenterLength) {
this.fragmenterLength = fragmenterLength;
}
public HighlighterParam(boolean highlight, String fieldName, String prefix, String stuffix, int fragmenterLength) {
this.highlight = highlight;
this.fieldName = fieldName;
this.prefix = prefix;
this.stuffix = stuffix;
this.fragmenterLength = fragmenterLength;
}
public HighlighterParam(boolean highlight, String fieldName, int fragmenterLength) {
this.highlight = highlight;
this.fieldName = fieldName;
this.fragmenterLength = fragmenterLength;
}
public HighlighterParam(boolean highlight, String fieldName, String prefix, String stuffix) {
this.highlight = highlight;
this.fieldName = fieldName;
this.prefix = prefix;
this.stuffix = stuffix;
}
public HighlighterParam() {
}
}
工具类对IndexWriter,IndexReader,IndexSearcher,Analyzer,QueryParser等Lucene这些常用操作对象的获取进行了封装，其中IndexWriter采用了单例模式，确保始终只有一个对象实例，因为Lucene限制了索引写操作是阻塞的，即同一时刻只能有一个IndexWriter在执行写操作，直到indexWriter释放lock，而索引读的操作是可以并发进行的。
