如何在 JAVA 中使用 ftp 客户端获取 ftp 服务器中的十二个最新文件

How to get the twelve latest file in ftp server using ftp client in JAVA

我想使用 FTP 客户端读取 FTP 服务器中的 12 个 12 个最新的 XML 文件，但我只得到最新的和最后一个。

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39

public static void main(String[] args) throws IOException
{
FTPClient client = new FTPClient();
try
{
client.connect(host);
client.login(user, pwd);
FTPFile[] files = client.listFiles();
FTPFile lastFile = lastFileModified(files);
System.out.println(lastFile.getName());
client.disconnect();
}
catch (SocketException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}

}

public static FTPFile lastFileModified(FTPFile[] files)
{
Date lastMod = files[0].getTimestamp().getTime();
FTPFile choice = null;
for (FTPFile file : files)
{
if (file.getTimestamp().getTime().after(lastMod))
{
choice = file;
lastMod = file.getTimestamp().getTime();
}
}
return choice;
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744

Connection Success
/AGIN/20150616
201506152344.xml
/AGIN/20150616
201506152348.xml
/AGIN/20150616
201506152352.xml
/AGIN/20150616
201506152356.xml
/AGIN/20150616
201506160000.xml
/AGIN/20150616
201506160004.xml
/AGIN/20150616
201506160008.xml
/AGIN/20150616
201506160012.xml
/AGIN/20150616
201506160016.xml
/AGIN/20150616
201506160020.xml
/AGIN/20150616
201506160024.xml
/AGIN/20150616
201506160028.xml
/AGIN/20150616
201506160032.xml
/AGIN/20150616
201506160036.xml
/AGIN/20150616
201506160040.xml
/AGIN/20150616
201506160044.xml
/AGIN/20150616
201506160048.xml
/AGIN/20150616
201506160052.xml
/AGIN/20150616
201506160056.xml
/AGIN/20150616
201506160100.xml
/AGIN/20150616
201506160104.xml
/AGIN/20150616
201506160108.xml
/AGIN/20150616
201506160112.xml
/AGIN/20150616
201506160116.xml
/AGIN/20150616
201506160120.xml
/AGIN/20150616
201506160124.xml
/AGIN/20150616
201506160128.xml
/AGIN/20150616
201506160132.xml
/AGIN/20150616
201506160136.xml
/AGIN/20150616
201506160140.xml
/AGIN/20150616
201506160144.xml
/AGIN/20150616
201506160148.xml
/AGIN/20150616
201506160152.xml
/AGIN/20150616
201506160156.xml
/AGIN/20150616
201506160200.xml
/AGIN/20150616
201506160204.xml
/AGIN/20150616
201506160208.xml
/AGIN/20150616
201506160212.xml
/AGIN/20150616
201506160216.xml
/AGIN/20150616
201506160220.xml
/AGIN/20150616
201506160224.xml
/AGIN/20150616
201506160228.xml
/AGIN/20150616
201506160232.xml
/AGIN/20150616
201506160236.xml
/AGIN/20150616
201506160240.xml
/AGIN/20150616
201506160244.xml
/AGIN/20150616
201506160248.xml
/AGIN/20150616
201506160252.xml
/AGIN/20150616
201506160256.xml
/AGIN/20150616
201506160300.xml
/AGIN/20150616
201506160304.xml
/AGIN/20150616
201506160308.xml
/AGIN/20150616
201506160312.xml
/AGIN/20150616
201506160316.xml
/AGIN/20150616
201506160320.xml
/AGIN/20150616
201506160324.xml
/AGIN/20150616
201506160328.xml
/AGIN/20150616
201506160332.xml
/AGIN/20150616
201506160336.xml
/AGIN/20150616
201506160340.xml
/AGIN/20150616
201506160344.xml
/AGIN/20150616
201506160348.xml
/AGIN/20150616
201506160352.xml
/AGIN/20150616
201506160356.xml
/AGIN/20150616
201506160400.xml
/AGIN/20150616
201506160404.xml
/AGIN/20150616
201506160408.xml
/AGIN/20150616
201506160412.xml
/AGIN/20150616
201506160416.xml
/AGIN/20150616
201506160420.xml
/AGIN/20150616
201506160424.xml
/AGIN/20150616
201506160428.xml
/AGIN/20150616
201506160432.xml
/AGIN/20150616
201506160436.xml
/AGIN/20150616
201506160440.xml
/AGIN/20150616
201506160444.xml
/AGIN/20150616
201506160448.xml
/AGIN/20150616
201506160452.xml
/AGIN/20150616
201506160456.xml
/AGIN/20150616
201506160500.xml
/AGIN/20150616
201506160504.xml
/AGIN/20150616
201506160508.xml
/AGIN/20150616
201506160512.xml
/AGIN/20150616
201506160516.xml
/AGIN/20150616
201506160520.xml
/AGIN/20150616
201506160524.xml
/AGIN/20150616
201506160528.xml
/AGIN/20150616
201506160532.xml
/AGIN/20150616
201506160536.xml
/AGIN/20150616
201506160540.xml
/AGIN/20150616
201506160544.xml
/AGIN/20150616
201506160548.xml
/AGIN/20150616
201506160552.xml
/AGIN/20150616
201506160556.xml
/AGIN/20150616
201506160600.xml
/AGIN/20150616
201506160604.xml
/AGIN/20150616
201506160608.xml
/AGIN/20150616
201506160612.xml
/AGIN/20150616
201506160616.xml
/AGIN/20150616
201506160620.xml
/AGIN/20150616
201506160624.xml
/AGIN/20150616
201506160628.xml
/AGIN/20150616
201506160632.xml
/AGIN/20150616
201506160636.xml
/AGIN/20150616
201506160640.xml
/AGIN/20150616
201506160644.xml
/AGIN/20150616
201506160648.xml
/AGIN/20150616
201506160652.xml
/AGIN/20150616
201506160656.xml
/AGIN/20150616
201506160700.xml
/AGIN/20150616
201506160704.xml
/AGIN/20150616
201506160708.xml
/AGIN/20150616
201506160712.xml
/AGIN/20150616
201506160716.xml
/AGIN/20150616
201506160720.xml
/AGIN/20150616
201506160724.xml
/AGIN/20150616
201506160728.xml
/AGIN/20150616
201506160732.xml
/AGIN/20150616
201506160736.xml
/AGIN/20150616
201506160740.xml
/AGIN/20150616
201506160744.xml
/AGIN/20150616
201506160748.xml
/AGIN/20150616
201506160752.xml
/AGIN/20150616
201506160756.xml
/AGIN/20150616
201506160800.xml
/AGIN/20150616
201506160804.xml
/AGIN/20150616
201506160808.xml
/AGIN/20150616
201506160812.xml
/AGIN/20150616
201506160816.xml
/AGIN/20150616
201506160820.xml
/AGIN/20150616
201506160824.xml
/AGIN/20150616
201506160828.xml
/AGIN/20150616
201506160832.xml
/AGIN/20150616
201506160836.xml
/AGIN/20150616
201506160840.xml
/AGIN/20150616
201506160844.xml
/AGIN/20150616
201506160848.xml
/AGIN/20150616
201506160852.xml
/AGIN/20150616
201506160856.xml
/AGIN/20150616
201506160900.xml
/AGIN/20150616
201506160904.xml
/AGIN/20150616
201506160908.xml
/AGIN/20150616
201506160912.xml
/AGIN/20150616
201506160916.xml
/AGIN/20150616
201506160920.xml
/AGIN/20150616
201506160924.xml
/AGIN/20150616
201506160928.xml
/AGIN/20150616
201506160932.xml
/AGIN/20150616
201506160936.xml
/AGIN/20150616
201506160940.xml
/AGIN/20150616
201506160944.xml
/AGIN/20150616
201506160948.xml
/AGIN/20150616
201506160952.xml
/AGIN/20150616
201506160956.xml
/AGIN/20150616
201506161000.xml
/AGIN/20150616
201506161004.xml
/AGIN/20150616
201506161008.xml
/AGIN/20150616
201506161012.xml
/AGIN/20150616
201506161016.xml
/AGIN/20150616
201506161020.xml
/AGIN/20150616
201506161024.xml
/AGIN/20150616
201506161028.xml
/AGIN/20150616
201506161032.xml
/AGIN/20150616
201506161036.xml
/AGIN/20150616
201506161040.xml
/AGIN/20150616
201506161044.xml
/AGIN/20150616
201506161048.xml
/AGIN/20150616
201506161052.xml
/AGIN/20150616
201506161056.xml
/AGIN/20150616
201506161100.xml
/AGIN/20150616
201506161104.xml
/AGIN/20150616
201506161108.xml
/AGIN/20150616
201506161112.xml
/AGIN/20150616
201506161116.xml
/AGIN/20150616
201506161120.xml
/AGIN/20150616
201506161124.xml
/AGIN/20150616
201506161128.xml
/AGIN/20150616
201506161132.xml
/AGIN/20150616
201506161136.xml
/AGIN/20150616
201506161140.xml
/AGIN/20150616
201506161144.xml
/AGIN/20150616
201506161148.xml
/AGIN/20150616
201506161152.xml
/AGIN/20150616
201506161156.xml
/AGIN/20150616
201506161200.xml
/AGIN/20150616
201506161204.xml
/AGIN/20150616
201506161208.xml
/AGIN/20150616
201506161212.xml
/AGIN/20150616
201506161216.xml
/AGIN/20150616
201506161220.xml
/AGIN/20150616
201506161224.xml
/AGIN/20150616
201506161228.xml
/AGIN/20150616
201506161232.xml
/AGIN/20150616
201506161236.xml
/AGIN/20150616
201506161240.xml
/AGIN/20150616
201506161244.xml
/AGIN/20150616
201506161248.xml
/AGIN/20150616
201506161252.xml
/AGIN/20150616
201506161256.xml
/AGIN/20150616
201506161300.xml
/AGIN/20150616
201506161304.xml
/AGIN/20150616
201506161308.xml
/AGIN/20150616
201506161312.xml
/AGIN/20150616
201506161316.xml
/AGIN/20150616
201506161320.xml
/AGIN/20150616
201506161324.xml
/AGIN/20150616
201506161328.xml
/AGIN/20150616
201506161332.xml
/AGIN/20150616
201506161336.xml
/AGIN/20150616
201506161340.xml
/AGIN/20150616
201506161344.xml
/AGIN/20150616
201506161348.xml
/AGIN/20150616
201506161352.xml
/AGIN/20150616
201506161356.xml
/AGIN/20150616
201506161400.xml
/AGIN/20150616
201506161404.xml
/AGIN/20150616
201506161408.xml
/AGIN/20150616
201506161412.xml
/AGIN/20150616
201506161416.xml
/AGIN/20150616
201506161420.xml
/AGIN/20150616
201506161424.xml
/AGIN/20150616
201506161428.xml
/AGIN/20150616
201506161432.xml
/AGIN/20150616
201506161436.xml
/AGIN/20150616
201506161440.xml
/AGIN/20150616
201506161444.xml
/AGIN/20150616
201506161448.xml
/AGIN/20150616
201506161452.xml
/AGIN/20150616
201506161456.xml
/AGIN/20150616
201506161500.xml
/AGIN/20150616
201506161504.xml
/AGIN/20150616
201506161508.xml
/AGIN/20150616
201506161512.xml
/AGIN/20150616
201506161516.xml
/AGIN/20150616
201506161520.xml
/AGIN/20150616
201506161524.xml
/AGIN/20150616
201506161528.xml
/AGIN/20150616
201506161532.xml
/AGIN/20150616
201506161536.xml
/AGIN/20150616
201506161540.xml
/AGIN/20150616
201506161544.xml
/AGIN/20150616
201506161548.xml
/AGIN/20150616
201506161552.xml
/AGIN/20150616
201506161556.xml
/AGIN/20150616
201506161600.xml
/AGIN/20150616
201506161604.xml
/AGIN/20150616
201506161608.xml
/AGIN/20150616
201506161612.xml
/AGIN/20150616
201506161616.xml
/AGIN/20150616
201506161620.xml
/AGIN/20150616
201506161624.xml
/AGIN/20150616
201506161628.xml
/AGIN/20150616
201506161632.xml
/AGIN/20150616
201506161636.xml
/AGIN/20150616
201506161640.xml
/AGIN/20150616
201506161644.xml
/AGIN/20150616
201506161648.xml
/AGIN/20150616
201506161652.xml
/AGIN/20150616
201506161656.xml
/AGIN/20150616
201506161700.xml
/AGIN/20150616
201506161704.xml
/AGIN/20150616
201506161708.xml
/AGIN/20150616
201506161712.xml
/AGIN/20150616
201506161716.xml
/AGIN/20150616
201506161720.xml
/AGIN/20150616
201506161724.xml
/AGIN/20150616
201506161728.xml
/AGIN/20150616
201506161732.xml
/AGIN/20150616
201506161736.xml
/AGIN/20150616
201506161740.xml
/AGIN/20150616
201506161744.xml
/AGIN/20150616
201506161748.xml
/AGIN/20150616
201506161752.xml
/AGIN/20150616
201506161756.xml
/AGIN/20150616
201506161800.xml
/AGIN/20150616
201506161804.xml
/AGIN/20150616
201506161808.xml
/AGIN/20150616
201506161812.xml
/AGIN/20150616
201506161816.xml
/AGIN/20150616
201506161820.xml
/AGIN/20150616
201506161824.xml
/AGIN/20150616
201506161828.xml
/AGIN/20150616
201506161832.xml
/AGIN/20150616
201506161836.xml
/AGIN/20150616
201506161840.xml
/AGIN/20150616
201506161844.xml
/AGIN/20150616
201506161848.xml
/AGIN/20150616
201506161852.xml
/AGIN/20150616
201506161856.xml
/AGIN/20150616
201506161900.xml
/AGIN/20150616
201506161904.xml
/AGIN/20150616
201506161908.xml
/AGIN/20150616
201506161912.xml
/AGIN/20150616
201506161916.xml
/AGIN/20150616
201506161920.xml
/AGIN/20150616
201506161924.xml
/AGIN/20150616
201506161928.xml
/AGIN/20150616
201506161932.xml
/AGIN/20150616
201506161936.xml
/AGIN/20150616
201506161940.xml
/AGIN/20150616
201506161944.xml
/AGIN/20150616
201506161948.xml
/AGIN/20150616
201506161952.xml
/AGIN/20150616
201506161956.xml
/AGIN/20150616
201506162000.xml
/AGIN/20150616
201506162004.xml
/AGIN/20150616
201506162008.xml
/AGIN/20150616
201506162012.xml
/AGIN/20150616
201506162016.xml
/AGIN/20150616
201506162020.xml
/AGIN/20150616
201506162024.xml
/AGIN/20150616
201506162028.xml
/AGIN/20150616
201506162032.xml
/AGIN/20150616
201506162036.xml
/AGIN/20150616
201506162040.xml
/AGIN/20150616
201506162044.xml
/AGIN/20150616
201506162048.xml
/AGIN/20150616
201506162052.xml
/AGIN/20150616
201506162056.xml
/AGIN/20150616
201506162100.xml
/AGIN/20150616
201506162104.xml
/AGIN/20150616
201506162108.xml
/AGIN/20150616
201506162112.xml
/AGIN/20150616
201506162116.xml
/AGIN/20150616
201506162120.xml
/AGIN/20150616
201506162124.xml
/AGIN/20150616
201506162128.xml
/AGIN/20150616
201506162132.xml
/AGIN/20150616
201506162136.xml
/AGIN/20150616
201506162140.xml
/AGIN/20150616
201506162144.xml
/AGIN/20150616
201506162148.xml
/AGIN/20150616
201506162152.xml
/AGIN/20150616
201506162156.xml
/AGIN/20150616
201506162200.xml
/AGIN/20150616
201506162204.xml
/AGIN/20150616
201506162208.xml
/AGIN/20150616
201506162212.xml
/AGIN/20150616
201506162216.xml
/AGIN/20150616
201506162220.xml
/AGIN/20150616
201506162224.xml
/AGIN/20150616
201506162228.xml
/AGIN/20150616
201506162232.xml
/AGIN/20150616
201506162236.xml
/AGIN/20150616
201506162240.xml
/AGIN/20150616
201506162244.xml
/AGIN/20150616
201506162248.xml
/AGIN/20150616
201506162252.xml
/AGIN/20150616
201506162256.xml
/AGIN/20150616
201506162300.xml
/AGIN/20150616
201506162304.xml
/AGIN/20150616
201506162308.xml
/AGIN/20150616
201506162312.xml
/AGIN/20150616
201506162316.xml
/AGIN/20150616
201506162320.xml
/AGIN/20150616
201506162324.xml
/AGIN/20150616
201506162328.xml
/AGIN/20150616
201506162332.xml
/AGIN/20150616
201506162336.xml
/AGIN/20150616
201506162340.xml
/AGIN/20150616
201506162344.xml
/AGIN/20150616
201506162348.xml
/AGIN/20150616
201506162352.xml
/AGIN/20150616
201506162356.xml
/AGIN/20150616
201506170000.xml
**/AGIN/20150616
201506170004.xml
/AGIN/20150616 LATEST　XML FILE
201506170004.xml**
/AGIN/lostAndfound/20150616
201506160536.xml
/AGIN/lostAndfound/20150616
201506160552.xml
/AGIN/lostAndfound/20150616
201506160608.xml
/AGIN/lostAndfound/20150616
201506160624.xml
Connection close

为自己创建一个类似

的比较器

1
2
3
4
5
6

public class ModifiedComparator implements Comparator<FTPFile> {

public int compare(FTPFile leftFile, FTPFile rightFile) {
return leftFile.getTimestamp().compareTo(rightFile.getTimeStamp());
}
}

从这里你有一个有序列表

您可以从列表中获取最后/前十二个项目。根据您提供的订单

1 2	List<FTPFile> list = Arrays.asList(files); Collections.sort(list, new ModifiedComparator());

编辑

1
2
3
4
5
6
7
8
9

public class LastModifiedComparator implements Comparator<FTPFile> {

public int compare(FTPFile leftFile, FTPFile rightFile) {
return -leftFile.getTimestamp().compareTo(rightFile.getTimeStamp());
}
}

List<FTPFile> list = Arrays.asList(files);
Collections.sort(list, new LastModifiedComparator());

你可以使用这个方法getLastNoOfFiles(list,12)返回你想要的文件数量。

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16

private List<FTPFile> getLastNoOfFiles(List<FTPFile> files, int noOfFilesToGet)
{
List<FTPFile> latestFiles = new ArrayList<FTPFile>();

int index = 1;
for (FTPFile file : files)
{
if (noOfFilesToGet < index)
{
break;
}
latestFiles.add(file);
index ++;
}
return latestFiles;
}