Lucene小记

Lucene.java：
建索引:

public class Lucene {  
    private Lucene() {}

    public static final String INDEX_DIR = "E:\\index";

    public static void index(ArrayList list, boolean create) {

        final File indexDir = new File(INDEX_DIR);
        Date start = new Date();
        try {
            IndexWriter writer = new IndexWriter(indexDir, new MMAnalyzer(), create);
            writer.setMergeFactor(100);
            for (int i=0; i<list.size(); i++){
                System.out.println("---i="+i);
                writer.addDocument(Doc.Document((BasicElement)list.get(i)));
            }
            writer.optimize();
            writer.close();

            Date end = new Date();
            System.out.println(end.getTime() - start.getTime() + " total milliseconds");
        } catch (IOException e) {
            System.out.println(e);
        }
    }


    public static ArrayList search(String strContent, String strDistrict,String StrBegin,String strEnd){


        ArrayList list = new ArrayList();
        try {
            BooleanQuery query = new BooleanQuery();
            StringTokenizer st=null;
            if(strContent!=null&& !"".equals(strContent)){
	              st = parseString("content", strContent);
	              while (st.hasMoreTokens()) {
	                  String str = "*"+st.nextToken()+"*";
	                  Query queryContent = new WildcardQuery(new Term("content",str));
	                  query.add(queryContent,BooleanClause.Occur.MUST);
	              }
            }
            if(strDistrict!=null&& !"".equals(strDistrict)){
                st = parseString("district", strDistrict);
                while (st.hasMoreTokens()) {
                    String str = "*"+st.nextToken()+"*";
                    Query queryDistrict = new WildcardQuery(new Term("district",str));
                    query.add(queryDistrict,BooleanClause.Occur.MUST);
                }
            }
            if(StrBegin!=null&& !"".equals(StrBegin) && strEnd!=null&& !"".equals(strEnd)){
	              RangeQuery queryTime = new RangeQuery(new Term("time",StrBegin), new Term("time",strEnd), true);
	              query.add(queryTime,BooleanClause.Occur.MUST);
            }
            System.out.println("query=" + query);
            Searcher searcher = new IndexSearcher(INDEX_DIR);

            Hits hits = searcher.search(query);
            System.out.println("hits.length()=" + hits.length());

            for (int i = 0; i < hits.length(); i++) {
                Document doc = hits.doc(i);
                HashMap map = new HashMap();
                map.put("table",doc.get("table"));
                map.put("pid",doc.get("pid"));
                //map.put("district",doc.get("district"));
                //map.put("time",doc.get("time"));
                System.out.println("doc.get table="+doc.get("table"));
                list.add(map);
            }
        } catch (Exception e) {
            System.out.println(e);
        }
        return list;
    }  

    public static StringTokenizer parseString(String strField, String strQuery){
        StringTokenizer st = null;
        try {
            MMAnalyzer analyzer = new MMAnalyzer();  
            QueryParser parser = new QueryParser(strField, analyzer);
            Query query = parser.parse(strQuery);
            st = new StringTokenizer(query.toString(strField).replace('\"', ' '));
        }catch (Exception e) {
            System.out.println(e);
        }
        return st;
    }  

    /*当添加一条新记录时触发该方法，同步增加索引记录*/
    public static void insertIndex(BasicElement entity) {
        try {
            IndexWriter writer = new IndexWriter(INDEX_DIR, new MMAnalyzer(), false);
            writer.addDocument(entity);
            writer.optimize();/*如果速度很慢，删除此行代码*/
            writer.close();
            System.out.println("insert Index OK!");
        } catch (IOException e) {
            System.out.println(e);
        }
    }    
    /*当删除一条记录时触发该方法，同步更新索引*/
    public static void deleteIndex(BasicElement entity) {
        try{
            Analyzer analyzer = new StandardAnalyzer();
            BooleanQuery query = new BooleanQuery();

            QueryParser parserPid = new QueryParser("pid", analyzer);
            Query queryPid = parserPid.parse(entity.getPid());
            query.add(queryPid,BooleanClause.Occur.MUST);

            QueryParser parserTable = new QueryParser("table", analyzer);
            Query queryTable = parserTable.parse(entity.getType());
            query.add(queryTable,BooleanClause.Occur.MUST);

            Searcher searcher = new IndexSearcher(INDEX_DIR);
            Hits hits = searcher.search(query);

            if (hit.length()>0){
                IndexReader reader = IndexReader.open(INDEX_DIR);
                reader.deleteDocument(hits.id(0));
                reader.close();
            }
        } catch (IOException e) {
            System.out.println(e);
        }
    }    
    /*当修改一条记录时触发该方法，同步更新索引*/
    public static void modifyIndex(BasicElement entity) {
        deleteIndex(entity);
        insertIndex(entity);
    }


    /*定时调用该方法，根据记录的修改时间，更新和增加索引记录
    ArrayList list是在上次更新索引到现在这段时间内所有修改过的记录*/    
    public static void updateIndex(ArrayList list) {
        try{
            for(int i=0; i<list.size(); i++){
                BasicElement entity = (BasicElement)list.get(i);
                deleteIndex(entity);
            }
            IndexWriter writer = new IndexWriter(INDEX_DIR, new MMAnalyzer(), false);
            writer.setMergeFactor(100);
            for (int i=0; i<list.size(); i++){
                writer.addDocument(Doc.Document((BasicElement)list.get(i)));
            }
            writer.optimize();
            writer.close();
        } catch (IOException e) {
            System.out.println(e);
        }
    }    

    public static void main(String[] args) {

    }  

} 

Doc.java

public class Doc {
  private Doc() {}

  public static Document Document(BasicElement entity){
	String strTable = "";
	String strPid = "";
	String strDistrict = "";
	String strTime = "";
	String strContent = "";
	if (strTable.equals("type")){
		strDistrict = "";
	}
    Document doc = new Document();

    doc.add(new Field("table",strTable, Field.Store.YES, Field.Index.TOKENIZED));
    doc.add(new Field("pid", strPid, Field.Store.YES, Field.Index.TOKENIZED));
    doc.add(new Field("district", strDistrict, Field.Store.NO, Field.Index.TOKENIZED));
    doc.add(new Field("time", strTime, Field.Store.NO, Field.Index.TOKENIZED));
    doc.add(new Field("content",strContent, Field.Store.NO, Field.Index.TOKENIZED));

	//System.out.println("Document.table:"+doc.get("table"));

    return doc;
  }