(a) Simple search

1 Interface 1.1 screenshot:

Principles: simplification, visualization, explaining problems, useful

1.2 Description:

1 Creating an index on a specified folder

2 input keywords, display query results

2 Implementation 2.1 Creation

Button1_Click method:

//indexing a set up folder        Private voidButton1_Click (Objectsender, EventArgs E1) {System.IO.FileInfo Docdir=NewSystem.IO.FileInfo (TextBox1.Text); System.DateTime start=System.DateTime.Now; Try            {                //Index builder IndexWriter, standard analyzer StandardAnalyzerIndexWriter writer =NewIndexWriter (Fsdirectory.open (index_dir),NewStandardAnalyzer (Version.lucene_current),true, IndexWriter.MaxFieldLength.LIMITED);                Indexdocs (writer, docdir); Writer.                Optimize (); Writer.                Close (); System.DateTime End=System.DateTime.Now; intTotalMilliseconds = End.millisecond-Start.millisecond; MessageBox.Show ("Index Complete! Total"+ TotalMilliseconds +"milliseconds"); }            Catch(System.IO.IOException e) {MessageBox.Show ("caught a"+ e.gettype () +"\ n with message:"+e.message); }                      }

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Indexdocs Method:

//Traverse the directory to index each documentInternalStaticvoidIndexdocs (indexwriter writer, System.IO.FileInfo file) {//Do not try to index files, cannot be read//if (File.canread ())//{{Aroush}} what's CanRead () in C #?{if (System.IO.Directory.Exists (file. FullName))//Directory recursion{system.string[] files =System.IO.Directory.GetFileSystemEntries (file. FullName);//An IO error could occurif (Files! =Null) {for (int i =0; I < files. Length; i++) {Indexdocs (writer,NewSystem.IO.FileInfo (Files[i])); } } }Else// index the file  "adding  "+ file); try {writer. Adddocument (filedocument.document (file)); // //// checking if the file can be read doesn ' t help catch 

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2.2 Queries

Button2_Click method

 //Enquiry        Private voidButton2_Click (Objectsender, EventArgs e)            {dataGridView1.Rows.Clear (); System.String KeyWord=TextBox2.Text; System.String Index="Index"; System.String Field="Contents"; System.String Normsfield=NULL; //1 Initializing reader, searcherIndexreader reader = Indexreader.open (Fsdirectory.open (NewSystem.IO.FileInfo (index)),true);//Only searching, so read-only=true            if(Normsfield! =NULL)//Normative StandardsReader =NewOnenormsreader (reader, Normsfield); Searcher Searcher=NewIndexsearcher (reader);//Search DeviceAnalyzer Analyzer =NewStandardAnalyzer (version.lucene_current); Queryparser Parser=NewQueryparser (field, analyzer);//keyword parser: Specify Type field, Word breaker analyzer//2 parsing keywords            if(KeyWord = =NULL|| Keyword.length = =-1)                return; KeyWord=Keyword.trim (); if(Keyword.length = =0)                return; Query Query=parser.            Parse (KeyWord); System.Console.Out.WriteLine ("Searching for:"+query.            ToString (field)); //3 Get query results hitsHits Hits = searcher. Search (query);//Hits             for(inti =0; I < hits. Length (); i++) {Document doc=hits.                   Doc (i); stringFullName = doc. Get ("Path");//# # #key                stringName = Fullname.substring (Fullname.lastindexof ("\\") +1, Fullname.length-1-Fullname.lastindexof ("\\")); DataGridViewRow Dr=NewDataGridViewRow (); intIndex1 =DataGridView1.Rows.Add (DR); DATAGRIDVIEW1.ROWS[INDEX1]. cells[0]. Value =name; DATAGRIDVIEW1.ROWS[INDEX1]. cells[1]. Value =FullName; } searcher.            Close (); Reader.        Close (); }

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3 Summary 3.1 methods:

1 Progressive: Logic--Level 1--Level 2

2 Seizing the core://### #key

3 Source code Comment segmentation, expected guessing

3.2 Points of Knowledge:

1 Build Index: indexwriter.adddocument (filedocument.document (file));

2 Parse Keyword: query query = parser. Parse (KeyWord);

3 Get query results: Hits Hits = searcher. Search (query);

3.3 Mentality:

Natural flow, not the pursuit of perfection.

Cycle exercises, gradually approaching, form a template.

VS Remove items does not cause deletion

4 Next

Document Summary

Chinese support

(a) Simple search