Lucene6入門教程(七)多目錄多執行緒索引/檢索
在使用lucene6 的時候,會遇到多目錄多執行緒的索引構建和檢索(查詢)情況。
把不同型別的資料放到同一個索引檔案中,這是不現實的,而且,除了記憶體索引,建立多目錄索引也能提高索引速度,這是因為,一個索引目錄只能有一把鎖,那如果有多個索引目錄,每個索引目錄發一把鎖,N個索引目錄同時進行索引寫操作就有意義了。
而檢索的時候,也需要多執行緒併發來提高搜尋速度。
下邊是程式碼,首先是LuceneUtils工具類,封裝各個物件,是為防止Index和Search過程時候的讀衝突或寫衝突等做準備的。
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.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
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.MultiFieldQueryParser;
import org.apache.lucene.queryparser.classic.QueryParser;
import org.apache.lucene.search.*;
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工具類(基於Lucene6封裝)
* @author Lanxiaowei
*
*/
public class LuceneUtils {
private static final LuceneManager luceneManager = LuceneManager.getInstance();
//public static Analyzer analyzer = new AnsjAnalyzer(true);
public static Analyzer analyzer = new StandardAnalyzer();
/**
* 開啟索引目錄
*
* @param luceneDir
* @return
* @throws IOException
*/
public static FSDirectory openFSDirectory(String luceneDir) {
FSDirectory directory = null;
try {
directory = FSDirectory.open(Paths.get(luceneDir));
/**
* 注意:isLocked方法內部會試圖去獲取Lock,如果獲取到Lock,會關閉它,否則return false表示索引目錄沒有被鎖,
* 這也就是為什麼unlock方法被從IndexWriter類中移除的原因
*/
IndexWriter.isLocked(directory);
} catch (IOException e) {
e.printStackTrace();
}
return directory;
}
/**
* 關閉索引目錄並銷燬
* @param directory
* @throws IOException
*/
public static void closeDirectory(Directory directory) throws IOException {
if (null != directory) {
directory.close();
directory = null;
}
}
/**
* 獲取IndexWriter
* @param dir
* @param config
* @return
*/
public static IndexWriter getIndexWriter(Directory dir, IndexWriterConfig config) {
return luceneManager.getIndexWriter(dir, config);
}
/**
* 獲取IndexWriter
// * @param dir
* @param config
* @return
*/
public static IndexWriter getIndexWrtier(String directoryPath, IndexWriterConfig config) {
FSDirectory directory = openFSDirectory(directoryPath);
return luceneManager.getIndexWriter(directory, config);
}
/**
* 獲取IndexReader
* @param dir
* @param enableNRTReader 是否開啟NRTReader
* @return
*/
public static IndexReader getIndexReader(Directory dir,boolean enableNRTReader) {
return luceneManager.getIndexReader(dir, enableNRTReader);
}
/**
* 獲取IndexReader(預設不啟用NRTReader)
* @param dir
* @return
*/
public static IndexReader getIndexReader(Directory dir) {
return luceneManager.getIndexReader(dir);
}
/**
* 獲取IndexSearcher
* @param reader IndexReader物件
* @param executor 如果你需要開啟多執行緒查詢,請提供ExecutorService物件引數
* @return
*/
public static IndexSearcher getIndexSearcher(IndexReader reader,ExecutorService executor) {
return luceneManager.getIndexSearcher(reader, executor);
}
/**
* 獲取IndexSearcher(不支援多執行緒查詢)
* @param reader IndexReader物件
* @return
*/
public static IndexSearcher getIndexSearcher(IndexReader reader) {
return luceneManager.getIndexSearcher(reader);
}
/**
* 建立QueryParser物件
* @param field
* @param analyzer
* @return
*/
public static QueryParser createQueryParser(String field, Analyzer analyzer) {
return new QueryParser(field, analyzer);
}
/**
* 關閉IndexReader
* @param reader
*/
public static void closeIndexReader(IndexReader reader) {
if (null != reader) {
try {
reader.close();
reader = null;
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 關閉IndexWriter
* @param writer
*/
public static void closeIndexWriter(IndexWriter writer) {
luceneManager.closeIndexWriter(writer);
}
/**
* 關閉IndexReader和IndexWriter
* @param reader
* @param writer
*/
public static void closeAll(IndexReader reader, IndexWriter writer) {
closeIndexReader(reader);
closeIndexWriter(writer);
}
/**
* 刪除索引[注意:請自己關閉IndexWriter物件]
* @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();
}
}
/**
* 刪除索引[注意:請自己關閉IndexWriter物件]
* @param writer
* @param query
*/
public static void deleteIndex(IndexWriter writer, Query query) {
try {
writer.deleteDocuments(query);
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 批量刪除索引[注意:請自己關閉IndexWriter物件]
* @param writer
* @param terms
*/
public static void deleteIndexs(IndexWriter writer,Term[] terms) {
try {
writer.deleteDocuments(terms);
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 批量刪除索引[注意:請自己關閉IndexWriter物件]
* @param writer
* @param querys
*/
public static void deleteIndexs(IndexWriter writer,Query[] querys) {
try {
writer.deleteDocuments(querys);
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 刪除所有索引文件
* @param writer
*/
public static void deleteAllIndex(IndexWriter writer) {
try {
writer.deleteAll();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 更新索引文件
* @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();
}
}
/**
* 更新索引文件
* @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);
}
/**
* 新增索引文件
* @param writer
//* @param doc
*/
public static void addIndex(IndexWriter writer, Document document) {
updateIndex(writer, null, document);
}
/**
* 索引文件查詢
* @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;
}
public static List<Document> queryp(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;
}
/**
* 返回索引文件的總數[注意:請自己手動關閉IndexReader]
* @param reader
* @return
*/
public static int getIndexTotalCount(IndexReader reader) {
return reader.numDocs();
}
/**
* 返回索引文件中最大文件ID[注意:請自己手動關閉IndexReader]
* @param reader
* @return
*/
public static int getMaxDocId(IndexReader reader) {
return reader.maxDoc();
}
/**
* 返回已經刪除尚未提交的文件總數[注意:請自己手動關閉IndexReader]
* @param reader
* @return
*/
public static int getDeletedDocNum(IndexReader reader) {
return getMaxDocId(reader) - getIndexTotalCount(reader);
}
/**
* 根據docId查詢索引文件
* @param reader IndexReader物件
* @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;
}
}
/**
* 根據docId查詢索引文件
* @param reader IndexReader物件
* @param docID documentId
* @return
*/
public static Document findDocumentByDocId(IndexReader reader,int docID) {
return findDocumentByDocId(reader, docID, null);
}
/**
* @Title: createHighlighter
* @Description: 建立高亮器
* @param query 索引查詢物件
* @param prefix 高亮字首字串
* @param stuffix 高亮字尾字串
* @param fragmenterLength 摘要最大長度
* @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: 生成高亮文字
* @param document 索引文件物件
* @param highlighter 高亮器
* @param analyzer 索引分詞器
* @param field 高亮欄位
* @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: 獲取符合條件的總記錄數
* @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分頁查詢
* @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);
//設定總記錄數
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: 分頁查詢[如果設定了高亮,則會更新索引文件]
* @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;
//若未設定高亮
if(null == highlighterParam || !highlighterParam.isHighlight()) {
pageQuery(searcher,directory,query, page);
} else {
int totalRecord = searchTotalRecord(searcher,query);
System.out.println("totalRecord:" + totalRecord);
//設定總記錄數
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 = getIndexWriter(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) {
//建立高亮器
Highlighter highlighter = LuceneUtils.createHighlighter(query,
highlighterParam.getPrefix(), highlighterParam.getStuffix(),
highlighterParam.getFragmenterLength());
String text = highlight(document, highlighter, analyzer, highlighterParam.getFieldName());
//若高亮後跟原始文字不相同,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);
}
}
然後是一個LuceneManager類
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索引讀寫器/查詢器單例獲取工具類
* @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 static ThreadLocal<IndexWriter> writerLocal = new ThreadLocal<IndexWriter>();
private LuceneManager() {}
public static LuceneManager getInstance() {
if (null == singleton) {
synchronized (LuceneManager.class) {
if (null == singleton) {
singleton = new LuceneManager();
}
}
}
return singleton;
}
/**
* 獲取IndexWriter單例物件
* @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();
writer = writerLocal.get();
if(null != writer) {
return writer;
}
if(null == writer){ //如果索引目錄被鎖,則直接拋異常
if(IndexWriter.isLocked(dir)) {
throw new LockObtainFailedException("Directory of index had been locked.");
}
writer = new IndexWriter(dir, config);
writerLocal.set(writer);
}
} catch (LockObtainFailedException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
writerLock.unlock();
}
return writer;
}
/**
* 獲取IndexWriter[可能為Null]
* @return
*/
public IndexWriter getIndexWriter() {
return writer;
}
/**
* 獲取IndexReader物件
* @param dir
* @param enableNRTReader 是否開啟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) {
//開啟近實時Reader,能立即看到動態新增/刪除的索引變化
reader = DirectoryReader.openIfChanged((DirectoryReader)reader);
}
}
} catch (IOException e) {
e.printStackTrace();
}
return reader;
}
/**
* 獲取IndexReader物件(預設不啟用NETReader)
* @param dir
* @return
*/
public IndexReader getIndexReader(Directory dir) {
return getIndexReader(dir, false);
}
/**
* 獲取IndexSearcher物件
* @param reader IndexReader物件例項
* @param executor 如果你需要開啟多執行緒查詢,請提供ExecutorService物件引數
* @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;
}
/**
* 獲取IndexSearcher物件(不支援多執行緒查詢)
* @param reader IndexReader物件例項
* @return
*/
public IndexSearcher getIndexSearcher(IndexReader reader) {
return getIndexSearcher(reader, null);
}
/**
* 關閉IndexWriter
* @param writer
*/
public void closeIndexWriter(IndexWriter writer) {
if(null != writer) {
try {
writer.close();
writer = null;
writerLocal.remove();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
多執行緒索引的類IndexCreator,防止寫衝突等
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.LinkOption;
import java.nio.file.OpenOption;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.concurrent.CountDownLatch;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.document.*;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.Term;
import org.apache.lucene.index.IndexWriterConfig.OpenMode;
import org.apache.lucene.store.FSDirectory;
/**
* 索引建立執行緒
* @author Lanxiaowei
*
*/
public class IndexCreator implements Runnable {
/**需要讀取的檔案存放目錄*/
private String docPath;
/**索引檔案存放目錄*/
private String luceneDir;
private int threadCount;
private final CountDownLatch countDownLatch1;
private final CountDownLatch countDownLatch2;
public IndexCreator(String docPath, String luceneDir,int threadCount,CountDownLatch countDownLatch1,CountDownLatch countDownLatch2) {
super();
this.docPath = docPath;
this.luceneDir = luceneDir;
this.threadCount = threadCount;
this.countDownLatch1 = countDownLatch1;
this.countDownLatch2 = countDownLatch2;
}
public void run() {
IndexWriter writer = null;
try {
countDownLatch1.await();
Analyzer analyzer = LuceneUtils.analyzer;
FSDirectory directory = LuceneUtils.openFSDirectory(luceneDir);
IndexWriterConfig config = new IndexWriterConfig(analyzer);
config.setOpenMode(OpenMode.CREATE_OR_APPEND);
writer = LuceneUtils.getIndexWriter(directory, config);
try {
indexDocs(writer, Paths.get(docPath));
} catch (IOException e) {
e.printStackTrace();
}
} catch (InterruptedException e1) {
e1.printStackTrace();
} finally {
LuceneUtils.closeIndexWriter(writer);
countDownLatch2.countDown();
}
}
/**
*
* @param writer
* 索引寫入器
* @param path
* 檔案路徑
* @throws IOException
*/
public static void indexDocs(final IndexWriter writer, Path path)
throws IOException {
// 如果是目錄,查詢目錄下的檔案
if (Files.isDirectory(path, new LinkOption[0])) {
System.out.println("directory");
Files.walkFileTree(path, new SimpleFileVisitor() {
@Override
public FileVisitResult visitFile(Object file,
BasicFileAttributes attrs) throws IOException {
Path path = (Path)file;
System.out.println(path.getFileName());
indexDoc(writer, path, attrs.lastModifiedTime().toMillis());
return FileVisitResult.CONTINUE;
}
});
} else {
indexDoc(writer, path,
Files.getLastModifiedTime(path, new LinkOption[0])
.toMillis());
}
}
/**
* 讀取檔案建立索引
*
* @param writer
* 索引寫入器
* @param file
* 檔案路徑
* @param lastModified
* 檔案最後一次修改時間
* @throws IOException
*/
public static void indexDoc(IndexWriter writer, Path file, long lastModified)
throws IOException {
InputStream stream = Files.newInputStream(file, new OpenOption[0]);
Document doc = new Document();
Field pathField = new StringField("path", file.toString(),
Field.Store.YES);
doc.add(pathField);
doc.add(new NumericDocValuesField("modified", lastModified));
doc.add(new LongPoint("modified", lastModified));
doc.add(new StoredField("modified", lastModified));
doc.add(new TextField("contents",intputStream2String(stream),Field.Store.YES));
//doc.add(new TextField("contents", new BufferedReader(new InputStreamReader(stream, StandardCharsets.UTF_8))));
if (writer.getConfig().getOpenMode() == IndexWriterConfig.OpenMode.CREATE) {
System.out.println("adding " + file);
writer.addDocument(doc);
} else {
System.out.println("updating " + file);
writer.updateDocument(new Term("path", file.toString()), doc);
}
writer.commit();
}
/**
* InputStream轉換成String
* @param is 輸入流物件
* @return
*/
private static String intputStream2String(InputStream is) {
BufferedReader bufferReader = null;
StringBuilder stringBuilder = new StringBuilder();
String line;
try {
bufferReader = new BufferedReader(new InputStreamReader(is, StandardCharsets.UTF_8));
while ((line = bufferReader.readLine()) != null) {
stringBuilder.append(line + "\r\n");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (bufferReader != null) {
try {
bufferReader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return stringBuilder.toString();
}
}
接著便是分頁的類
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> {
/**當前第幾頁(從1開始計算)*/
private int currentPage;
/**每頁顯示幾條*/
private int pageSize;
/**總記錄數*/
private int totalRecord;
/**總頁數*/
private int totalPage;
/**分頁資料集合[用泛型T來限定集合元素型別]*/
private Collection<T> items;
/**當前顯示起始索引(從零開始計算)*/
private int startIndex;
/**當前顯示結束索引(從零開始計算)*/
private int endIndex;
/**一組最多顯示幾個頁碼[比如Google一組最多顯示10個頁碼]*/
private int groupSize;
/**左邊偏移量*/
private int leftOffset = 5;
/**右邊偏移量*/
private int rightOffset = 4;
/**當前頁碼範圍*/
private String[] pageRange;
/**分頁資料*/
private List<Document> docList;
/**上一頁最後一個ScoreDoc物件*/
private ScoreDoc afterDoc;
/**上一頁最後一個ScoreDoc物件的Document物件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[從1開始計算]*/
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 = pageSi