Lucene 3.6.2入門(6) 進階搜尋之排序

package com.jadyer.lucene;        import java.io.File;  import java.io.IOException;  import java.text.SimpleDateFormat;  import java.util.Date;        import org.apache.lucene.analysis.standard.StandardAnalyzer;  import org.apache.lucene.document.Document;  import org.apache.lucene.document.Field;  import org.apache.lucene.document.NumericField;  import org.apache.lucene.index.IndexReader;  import org.apache.lucene.index.IndexWriter;  import org.apache.lucene.index.IndexWriterConfig;  import org.apache.lucene.queryParser.QueryParser;  import org.apache.lucene.search.IndexSearcher;  import org.apache.lucene.search.ScoreDoc;  import org.apache.lucene.search.Sort;  import org.apache.lucene.search.SortField;  import org.apache.lucene.search.TopDocs;  import org.apache.lucene.store.Directory;  import org.apache.lucene.store.FSDirectory;  import org.apache.lucene.util.Version;        /**  * 【Lucene3.6.2入門系列】第06節_進階搜尋之排序  * @create Aug 19, 2013 10:38:19 AM  * @author 玄玉<http://blog.csdn.net/jadyer>  */public class AdvancedSearchBySort {      private Directory directory;      private IndexReader reader;                public AdvancedSearchBySort(){          /**檔案大小*/        int[] sizes = {90, 10, 20, 10, 60, 50};          /**檔案名稱*/        String[] names = {"Michael.java", "Scofield.ini", "Tbag.txt", "Jack", "Jade", "Jadyer"};          /**檔案內容*/        String[] contents = {"my java blog is http://blog.csdn.net/jadyer",                               "my Java Website is http://www.jadyer.cn",                               "my name is jadyer",                               "I am a Java Developer",                               "I am from Haerbin",                               "I like java of Lucene"};          /**檔案日期*/        Date[] dates = new Date[sizes.length];          SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd HH:mm:ss");          IndexWriter writer = null;          Document doc = null;          try {              dates[0] = sdf.parse("20130407 15:25:30");              dates[1] = sdf.parse("20130407 16:30:45");              dates[2] = sdf.parse("20130213 11:15:25");              dates[3] = sdf.parse("20130808 09:30:55");              dates[4] = sdf.parse("20130526 13:54:22");              dates[5] = sdf.parse("20130701 17:35:34");              directory = FSDirectory.open(new File("myExample/01_index/"));              writer = new IndexWriter(directory, new IndexWriterConfig(Version.LUCENE_36, new StandardAnalyzer(Version.LUCENE_36)));              writer.deleteAll();              for(int i=0; i<sizes.length; i++){                  doc = new Document();                  doc.add(new NumericField("size",Field.Store.YES, true).setIntValue(sizes[i]));                  doc.add(new Field("name", names[i], Field.Store.YES, Field.Index.ANALYZED_NO_NORMS));                  doc.add(new Field("content", contents[i], Field.Store.NO, Field.Index.ANALYZED));                  doc.add(new NumericField("date", Field.Store.YES, true).setLongValue(dates[i].getTime()));                  writer.addDocument(doc);              }          } catch (Exception e) {              e.printStackTrace();          } finally {              if(null != writer){                  try {                      writer.close();                  } catch (IOException ce) {                      ce.printStackTrace();                  }              }          }      }                /**      * 擷取IndexReader執行個體      */    private IndexReader getIndexReader(){          try {              if(reader == null){                  reader = IndexReader.open(directory);              }else{                  //if the index was changed since the provided reader was opened, open and return a new reader; else,return null                  //如果當前reader在開啟期間index發生改變,則開啟並返回一個新的IndexReader,否則返回null                // http://www.bianceng.cn                IndexReader ir = IndexReader.openIfChanged(reader);                  if(ir != null){                      reader.close(); //關閉原reader                      reader = ir;    //賦予新reader                  }              }              return reader;          }catch(Exception e) {              e.printStackTrace();          }          return null; //發生異常則返回null      }                          /**      * 搜尋排序      * @see 關於Sort參數的可輸入規則,如下所示      * @see 1)Sort.INDEXORDER--使用文檔編號從小到大的順序進行排序      * @see 2)Sort.RELEVANCE---使用文檔評分從大到小的順序進行排序,也是預設的定序,等價於search(query, 10)      * @see 3)new Sort(new SortField("size", SortField.INT))-----------使用檔案大小從小到大的順序排序      * @see 4)new Sort(new SortField("date", SortField.LONG))----------使用檔案日期從以前到現在的順序排序      * @see 5)new Sort(new SortField("name", SortField.STRING))--------使用檔案名稱從A到Z的順序排序      * @see 6)new Sort(new SortField("name", SortField.STRING, true))--使用檔案名稱從Z到A的順序排序      * @see 7)new Sort(new SortField("size", SortField.INT), SortField.FIELD_SCORE)--先按照檔案大小排序,再按照文檔評分排序(可以指定多個定序)      * @see 注意:以上7個Sort再列印文檔評分時都是NaN,只有search(query, 10)才會正確列印文檔評分      * @param expr 搜尋運算式      * @param sort 定序      */    public void searchBySort(String expr, Sort sort){          IndexSearcher searcher = new IndexSearcher(this.getIndexReader());          QueryParser parser = new QueryParser(Version.LUCENE_36, "content", new StandardAnalyzer(Version.LUCENE_36));          TopDocs tds = null;          try {              if(null == sort){                  tds = searcher.search(parser.parse(expr), 10);              }else{                  tds = searcher.search(parser.parse(expr), 10, sort);              }              for(ScoreDoc sd : tds.scoreDocs){                  Document doc = searcher.doc(sd.doc);                  System.out.print("文檔編號=" + sd.doc + "  文檔權值=" + doc.getBoost() + "  文檔評分=" + sd.score + "    ");                  System.out.println("size=" + doc.get("size") + "  date=" + new SimpleDateFormat("yyyyMMdd HH:mm:ss").format(new Date(Long.parseLong(doc.get("date")))) + "  name=" + doc.get("name"));              }          } catch (Exception e) {              e.printStackTrace();          } finally {              if(searcher != null){                  try {                      searcher.close();                  } catch (IOException e) {                      e.printStackTrace();                  }              }          }      }                          /**      * 測試一下排序效果      */    public static void main(String[] args) {          AdvancedSearchBySort advancedSearch = new AdvancedSearchBySort();  //      //使用文檔評分從大到小的順序進行排序,也是預設的定序  //      advancedSearch.searchBySort("Java", null);  //      advancedSearch.searchBySort("Java", Sort.RELEVANCE);  //      //使用文檔編號從小到大的順序進行排序  //      advancedSearch.searchBySort("Java", Sort.INDEXORDER);  //      //使用檔案大小從小到大的順序排序  //      advancedSearch.searchBySort("Java", new Sort(new SortField("size", SortField.INT)));  //      //使用檔案日期從以前到現在的順序排序  //      advancedSearch.searchBySort("Java", new Sort(new SortField("date", SortField.LONG)));  //      //使用檔案名稱從A到Z的順序排序  //      advancedSearch.searchBySort("Java", new Sort(new SortField("name", SortField.STRING)));  //      //使用檔案名稱從Z到A的順序排序  //      advancedSearch.searchBySort("Java", new Sort(new SortField("name", SortField.STRING, true)));          //先按照檔案大小排序,再按照文檔評分排序(可以指定多個定序)          advancedSearch.searchBySort("Java", new Sort(new SortField("size", SortField.INT), SortField.FIELD_SCORE));      }  }