lucene4.7 （1）全文检索之根据数据库内容创建索引

package org.apache.lucene.demo;

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Date;
import java.util.List;
import java.util.Map;

import org.apache.commons.dbutils.DbUtils;
import org.apache.lucene.analysis.cn.ChineseAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.IntField;
import org.apache.lucene.document.LongField;
import org.apache.lucene.document.StringField;
import org.apache.lucene.document.TextField;
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.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.util.Version;
import org.apache.poi.util.IntegerField;

import thtf.ebuilder.website.search.DBIndex;
import thtf.ebuilder.website.services.HTMLServices;

/** Index all text files under a directory.
 * <p>
 * This is a command-line application demonstrating simple Lucene indexing.
 * Run it with no command-line arguments for usage information.
 */
public class IndexFiles {
  
  private IndexFiles() {}

  /** Index all text files under a directory. */
  public static void main(String[] args) {
    String indexPath = DBIndex._$.getIndexFile().toString();
    boolean add = true;
    
    Date start = new Date();
    try {
      Directory dir = FSDirectory.open(new File(indexPath));
      IndexWriterConfig iwc = new IndexWriterConfig(Version.LUCENE_47, DBIndex._$.analyzer);
      if (add) {
        iwc.setOpenMode(OpenMode.CREATE);
      } else {
        iwc.setOpenMode(OpenMode.CREATE_OR_APPEND);
      }
      IndexWriter writer = new IndexWriter(dir, iwc);
      indexDocs(writer);

      // NOTE: if you want to maximize search performance,
      // you can optionally call forceMerge here.  This can be
      // a terribly costly operation, so generally it's only
      // worth it when your index is relatively static (ie
      // you're done adding documents to it):
      //
      // writer.forceMerge(1);

      writer.close();

      Date end = new Date();
      System.out.println(end.getTime() - start.getTime() + " total milliseconds");

    } catch (IOException e) {
      System.out.println(" caught a " + e.getClass() +
       "\n with message: " + e.getMessage());
    }
  }

  /**
   * Indexes the given file using the given writer, or if a directory is given,
   * recurses over files and directories found under the given directory.
   * 
   * NOTE: This method indexes one document per input file.  This is slow.  For good
   * throughput, put multiple documents into your input file(s).  An example of this is
   * in the benchmark module, which can create "line doc" files, one document per line,
   * using the
   * <a href="../../../../../contrib-benchmark/org/apache/lucene/benchmark/byTask/tasks/WriteLineDocTask.html"
   * >WriteLineDocTask</a>.
   *  
   * @param writer Writer to the index where the given file/dir info will be stored
   * @param file The file to index, or the directory to recurse into to find files to index
   * @throws IOException If there is a low-level I/O error
   */
  static void indexDocs(IndexWriter writer)
    throws IOException {
        try {
          // make a new, empty document
          
          List list=new DbUtils().queryToMapList("select info_id,info_title,info_content from up_info limit 500");
          for(int i=0;i<list.size();i++){
        	  Map map=(Map)list.get(i);
        	  Document doc = new Document();
        	  
        	  Field info_id = new IntField("info_id",Integer.valueOf(String.valueOf(map.get("info_id"))), Field.Store.YES);
              doc.add(info_id);
        	  
              Field info_title = new StringField("info_title", map.get("info_title")==null?"": map.get("info_title").toString(), Field.Store.YES);
              doc.add(info_title);
              
              Field info_content = new TextField("info_content", map.get("info_content")==null?"": HTMLServices.clearHTMLToString(map.get("info_content").toString()), Field.Store.YES);
              doc.add(info_content);
              
              if (writer.getConfig().getOpenMode() == OpenMode.CREATE) {
                writer.addDocument(doc);
              } else {
                writer.updateDocument(new Term("info_id",map.get("info_id")==null?"1": map.get("info_id").toString() ), doc);
              }
          }
          writer.commit();
//          // Add the path of the file as a field named "path".  Use a
//          // field that is indexed (i.e. searchable), but don't tokenize 
//          // the field into separate words and don't index term frequency
//          // or positional information:
//          Field pathField = new StringField("path", file.getPath(), Field.Store.YES);
//          doc.add(pathField);
//
//          // Add the last modified date of the file a field named "modified".
//          // Use a LongField that is indexed (i.e. efficiently filterable with
//          // NumericRangeFilter).  This indexes to milli-second resolution, which
//          // is often too fine.  You could instead create a number based on
//          // year/month/day/hour/minutes/seconds, down the resolution you require.
//          // For example the long value 2011021714 would mean
//          // February 17, 2011, 2-3 PM.
//          doc.add(new LongField("modified", file.lastModified(), Field.Store.NO));
//
//          // Add the contents of the file to a field named "contents".  Specify a Reader,
//          // so that the text of the file is tokenized and indexed, but not stored.
//          // Note that FileReader expects the file to be in UTF-8 encoding.
//          // If that's not the case searching for special characters will fail.
//          BufferedReader _content=new BufferedReader(new InputStreamReader(fis, "UTF-8"));
//          System.out.println(_content);
//          doc.add(new TextField("contents", _content));
//
//          if (writer.getConfig().getOpenMode() == OpenMode.CREATE) {
//            // New index, so we just add the document (no old document can be there):
//            System.out.println("adding " + file);
//            writer.addDocument(doc);
//          } else {
//            // Existing index (an old copy of this document may have been indexed) so 
//            // we use updateDocument instead to replace the old one matching the exact 
//            // path, if present:
//            System.out.println("updating " + file);
//            writer.updateDocument(new Term("path", file.getPath()), doc);
//          }
        }catch (Exception e) {
        	e.printStackTrace();
        }
  }
}