Chuanzhi podcast-itcastbbs (6)

(20:40:15)

Reprinted

Tags: It

Lucene:

1. Example: Eclipse help;

2. Create an index: only text data can be indexed.
 
 HTML (remove tags), PDF, etc. can be converted to text using corresponding tools;
 
3. Principle: Dictionary
 Key ---> recordnum
 AB ---> 5, 7, 10
 Document;
  5
  7
  10

4. Use:

 4.1 create a Java project;
 4.2 Add *. jar; [No configuration file] the current version is 2.4;
  Core; Word divider; Highlight;
 4.3 write code test;
  Firsttest
   Stringindexpath = "C:/javasedemoindex /";
   Analyzeranalyzer = new standardanalyer ();
  
   @ Test
   Testcreateindex (){
    Stringtitle = "XXX ";
    Stringcontent = "Yyy ";
    
    // 1. Create an index   
    Maxfieldlengthmaxfieldlength = maxfieldlength. Limited;
    
    // If the index library does not exist, it is created;
    Indexwriterindexwriter = new indexwriter (indexpath, analyzer, maxfieldlength );
    
    
    // Document, Field
    Documentdoc = new document ();
    Doc. Add (Newfield ("title", title, store. Yes, index. Analyzed ));
    Doc. Add (Newfield ("content", content, store. Yes, index. Analyzed ));
    
    Indexwriter. adddocument (DOC );
    
    
    // Close after use
    Indexwriter. Close (); 
   }
   
   
   Voidtestsearch (){
   
    Stringquerystring = "document ";   
    Indexsearcherindexsearcher = new indexsearcher (indexpath );
    
    Stringdefafielfieldname = "content ";
    Queryparserqueryparser = new queryparser (defaultfieldname, analyzer );
    
    QueryQuery= Queryparser. parse (querystring );  // Query Conditions
    FilterFilter= NULL;  // Filter Condition
    IntNdocs= 100;  // Returns the number of matched results.
    
    // Return results
    Topdocstopdocs = indexsearcher. Search (query, filter, ndocs );
    System. Out. println ("total [" + topdocs. totalhits + "matching records ");
    
    List <document> docs = newarraylist <document> ();
    For (scoredoc: topdocs. scoredocs ){
     Intdocnum = scoredoc.doc; // Document ID in the index Library
    
     Documentdoc = indexsearcher.doc (docnum); // retrieve the corresponding document by serial number
     
     Doc. Add (DOC );
    }   
    Indexsearcher. Close ();