Obtain the last modification time of the file on FTP

1. /**
2. *
3. */
4. Package com. zjpii. hxj. util;
6. Import java. Io. ioexception;
7. Import java.net. socketexception;
8. Import java. Text. simpledateformat;
9. Import java. util. date;
10. Import java. util. hashmap;
11. Import java. util. Map;
13. Import org.apache.commons.net. FTP. ftpclient;
14. Import org.apache.commons.net. FTP. ftpfile;
16. /**
17. * Operations on files on FTP
18. * Use Apache's commons-net-1.4.1.jar package
19. * @ Author hxj
20. * @ Date 2008-11-1
21. *
22. */
23. Public class ftputil {
25. /**
26. * Obtain the last modification time of the FTP file.
27. * @ Param host FTP host address e.g. "127.0.0.1"
28. * @ Param username e.g. "username"
29. * @ Param Password e.g. "passowrd"
30. * @ Param path file path e.g. "ftputil/test.txt"
31. * @ Return date: If the connection is successful, return the java. util. Date time. If the connection fails, return null.
32. * @ Throws ioexception
33. * @ Throws socketexception
34. */
35. Public date getfilelastmodifiedtime (string host, string username, string password, string path) throws socketexception, ioexception {
36. Date lastmodifieddate = NULL;
37. Ftpclient = new ftpclient ();
38. Ftpclient. Connect (host );
39. Boolean islogin = ftpclient. login (username, password );
40. // Return NULL if FTP connection fails
41. If (! Islogin ){
42. Ftpclient. Disconnect ();
43. Ftpclient = NULL;
44. Return NULL;
45. }
46. // Obtain the file in the path on the FTP
47. Ftpfile [] filelist = ftpclient. listfiles (PATH );
48. For (INT I = 0; I <filelist. length; I ++ ){
49. Lastmodifieddate = filelist [I]. gettimestamp (). gettime ();
50. }
51. Return lastmodifieddate;
52. }
54. /**
55. * Obtain the modification time of all files in the FTP path.
56. * @ Param host FTP host address e.g. "127.0.0.1"
57. * @ Param username e.g. "username"
58. * @ Param Password e.g. "passowrd"
59. * @ Param path file path e.g. "ftputil"
60. * @ Return java. util. Map returns a map whose key is the file name and whose value is the last modification time (Java. util. Date). If the connection fails, null is returned.
61. * @ Throws socketexception
62. * @ Throws ioexception
63. */
64. Public map getallfilelastmodifiedtime (string host, string username, string password, string path) throws socketexception, ioexception {
65. Date lastmodifieddate = NULL;
66. Ftpclient = new ftpclient ();
67. Ftpclient. Connect (host );
68. Boolean islogin = ftpclient. login (username, password );
69. // Return NULL if FTP connection fails
70. If (! Islogin ){
71. Ftpclient. Disconnect ();
72. Ftpclient = NULL;
73. Return NULL;
74. }
75. // Obtain the file in the path on the FTP
76. Ftpfile [] filelist = ftpclient. listfiles (PATH );
77. // Hashmap capacity: filelist. Length
78. Map map = new hashmap (filelist. Length );
79. For (INT I = 0; I <filelist. length; I ++ ){
80. Lastmodifieddate = filelist [I]. gettimestamp (). gettime ();
81. // Key file name; value modification time (Java. util. Date)
82. Map. Put (filelist [I]. getname (), lastmodifieddate );
83. }
84. Return map;
85. }
87. /**
88. * @ Param ARGs
89. */
90. Public static void main (string [] ARGs ){
92. Ftputil = new ftputil ();
93. Try {
94. String host = "134.98.8.214 ";
95. String username = "HZ ";
96. String Password = "HZ ";
97. Simpledateformat dateformat = new simpledateformat ("yyyy-mm-dd hh: mm: dd ");
98. Date = ftputil. getfilelastmodifiedtime (host, username, password, "qxtmp/wangjun-test.txt ");
99. System. Out. println ("Method1:" + dateformat. Format (date ));
101. Map map = ftputil. getallfilelastmodifiedtime (host, username, password, "qxtmp ");
102. System. Out. println (Map. Size ());
103. System. Out. println ("method2:" + dateformat. Format (Map. Get ("ipashd.txt ")));
105. } Catch (socketexception e ){
106. E. printstacktrace ();
107. } Catch (ioexception e ){
108. E. printstacktrace ();
109. }
110. }
112. }