Small solution for Lucene instances.

1. Create a folder named S on drive C in windows, and create three TXT files in the folder, named "1.txt ", "2.txt" and" 3.txt"
The content of 1.txt is as follows:

Java code

1. People's Republic of China
2. People all over China
3. 2006

The content of "2.txt" and" 3.txt" can also be written in a few minutes. If you are writing it in a lazy way, just copy the content of a 1.txt file.

 

2. Download The Lucene package and put it in the classpath path.
Index creation:

Java code

1. Package lighter.javaeye.com;
3. Import java. Io. bufferedreader;
4. Import java. Io. file;
5. Import java. Io. fileinputstream;
6. Import java. Io. ioexception;
7. Import java. Io. inputstreamreader;
8. Import java. util. date;
10. Import org. Apache. Lucene. analysis. analyzer;
11. Import org. Apache. Lucene. analysis. Standard. standardanalyzer;
12. Import org.apache.e.doc ument. Document;
13. Import org.apache.e.doc ument. field;
14. Import org. Apache. Lucene. Index. indexwriter;
16. /**
17. * Author lighter date 2006-8-7
18. */
19. Public class textfileindexer {
20. Public static void main (string [] ARGs) throws exception {
21. /* Specify the location of the folder to be indexed. Here is the S folder of drive C */
22. File filedir = new file ("C: // s ");
24. /* Place the index file here */
25. File indexdir = new file ("C: // Index ");
26. Analyzer luceneanalyzer = new standardanalyzer ();
27. Indexwriter = new indexwriter (indexdir, luceneanalyzer,
28. True );
29. File [] textfiles = filedir. listfiles ();
30. Long starttime = new date (). gettime ();
32. // Add document to index
33. For (INT I = 0; I <textfiles. length; I ++ ){
34. If (textfiles [I]. isfile ()
35. & Textfiles [I]. getname (). endswith (". txt ")){
36. System. Out. println ("file" + textfiles [I]. GetCanonicalPath ()
37. + "Being indexed ....");
38. String temp = filereaderall (textfiles [I]. GetCanonicalPath (),
39. "GBK ");
40. System. Out. println (temp );
41. Document document = new document ();
42. Field fieldpath = new field ("path", textfiles [I]. getpath (),
43. Field. Store. Yes, field. Index. No );
44. Field fieldbody = new field ("body", temp, field. Store. Yes,
45. Field. Index. tokenized,
46. Field. termvector. with_positions_offsets );
47. Document. Add (fieldpath );
48. Document. Add (fieldbody );
49. Indexwriter. adddocument (document );
50. }
51. }
52. // The optimize () method is used to optimize the index.
53. Indexwriter. Optimize ();
54. Indexwriter. Close ();
56. // Test the index time
57. Long endtime = new date (). gettime ();
58. System. Out
59. . Println ("This cost"
60. + (Endtime-starttime)
61. + "Add the document to the index in milliseconds! "
62. + Filedir. getpath ());
63. }
65. Public static string filereaderall (string filename, string charset)
66. Throws ioexception {
67. Bufferedreader reader = new bufferedreader (New inputstreamreader (
68. New fileinputstream (filename), charset ));
69. String line = new string ();
70. String temp = new string ();
72. While (line = reader. Readline ())! = NULL ){
73. Temp + = line;
74. }
75. Reader. Close ();
76. Return temp;
77. }
78. }

Index result: Java code

1. File C:/S/1.txt being indexed ....
2. People of the People's Republic of China, 2006
3. File C:/S/2.txt being indexed ....
4. People of the People's Republic of China, 2006
5. File C:/S/3.txt being indexed ....
6. People of the People's Republic of China, 2006
7. This takes 297 milliseconds to add the document to the index! C:/s

3. After the index is created, query... java code

1. Package lighter.javaeye.com;
3. Import java. Io. ioexception;
5. Import org. Apache. Lucene. analysis. analyzer;
6. Import org. Apache. Lucene. analysis. Standard. standardanalyzer;
7. Import org. Apache. Lucene. queryparser. parseexception;
8. Import org. Apache. Lucene. queryparser. queryparser;
9. Import org. Apache. Lucene. Search. Hits;
10. Import org. Apache. Lucene. Search. indexsearcher;
11. Import org. Apache. Lucene. Search. query;
13. Public class testquery {
14. Public static void main (string [] ARGs) throws ioexception, parseexception {
15. Hits hits = NULL;
16. String querystring = "China ";
17. Query query = NULL;
18. Indexsearcher searcher = new indexsearcher ("C: // Index ");
20. Analyzer analyzer = new standardanalyzer ();
21. Try {
22. Queryparser QP = new queryparser ("body", analyzer );
23. Query = QP. parse (querystring );
24. } Catch (parseexception e ){
25. }
26. If (searcher! = NULL ){
27. Hits = searcher. Search (query );
28. If (hits. Length ()> 0 ){
29. System. Out. println ("found:" + hits. Length () + "results! ");
30. }
31. }
32. }
34. }

Its running result: found by reference: 3 results!