質問編集履歴
4
追記情報
test
CHANGED
File without changes
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test
CHANGED
@@ -755,3 +755,21 @@
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755
755
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756
756
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757
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```
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758
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+
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759
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+
追記4
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760
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+
|
761
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+
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762
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+
|
763
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+
Main.javaとTest.javaではDAOのfindAll()内の処理が異なるようです。
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764
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+
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765
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+
1 : Main.java、Test.javaはともにClass.forName( DRIVER_NAME );までは読み込む
|
766
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+
|
767
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+
2 : Main.javaはその後finally{}へ飛ぶ
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768
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+
|
769
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+
3 : Test.javaは順調にcon = DriverManager.getConnection( JDBC_URL, DB_USER, DB_PASS );を読み込む
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770
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+
|
771
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+
4 : 仮にClass.forName()でエラーを出していた場合、ClassNotFoundExceptionでエラーを捕捉していない
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772
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+
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773
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+
|
774
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+
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775
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+
もはやソースコード上の問題なのか不明です。
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3
追記
test
CHANGED
File without changes
|
test
CHANGED
@@ -549,3 +549,209 @@
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|
549
549
|
|
550
550
|
|
551
551
|
こう見ると、そもそもサーブレットクラスのMain.javaで取得ができていないようですね、、。
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552
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+
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553
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+
|
554
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+
|
555
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+
---
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556
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+
|
557
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+
追記3
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558
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+
|
559
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+
|
560
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+
|
561
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+
DAOクラスのfindAll()までデバッグを行いました。
|
562
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+
|
563
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+
|
564
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+
|
565
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+
結果、Test.javaではfindAll()でDBからの情報を取得し、しっかりと返り値を返しています。しかし、Main.javaではfindAll()ではtry{}が全てスキップしており、finally{}のみ実行されていました。(コードは最後に書きます)
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566
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+
|
567
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+
|
568
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+
|
569
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+
関係しているファイルは最初に記載した通りで、今回の流れではDBにSELECT文しか送っておらず、かなり簡単なもののはずですが、どこがおかしいのか、、、。
|
570
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+
|
571
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+
|
572
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+
|
573
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+
```java
|
574
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+
|
575
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+
package dao;
|
576
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+
|
577
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+
|
578
|
+
|
579
|
+
import java.sql.Connection;
|
580
|
+
|
581
|
+
import java.sql.DriverManager;
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582
|
+
|
583
|
+
import java.sql.PreparedStatement;
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584
|
+
|
585
|
+
import java.sql.ResultSet;
|
586
|
+
|
587
|
+
import java.sql.SQLException;
|
588
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+
|
589
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+
import java.util.ArrayList;
|
590
|
+
|
591
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+
import java.util.List;
|
592
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+
|
593
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+
|
594
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+
|
595
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+
import model.Mutter;
|
596
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+
|
597
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+
|
598
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+
|
599
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+
public class MutterDAO{
|
600
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+
|
601
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+
private final String DRIVER_NAME = "com.mysql.jdbc.Driver";
|
602
|
+
|
603
|
+
private final String JDBC_URL = "jdbc:mysql://localhost:8889/docoTsubu";
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604
|
+
|
605
|
+
private final String DB_USER = "○○○○○○○";
|
606
|
+
|
607
|
+
private final String DB_PASS = "○○○○○○○";
|
608
|
+
|
609
|
+
|
610
|
+
|
611
|
+
public List< Mutter > findAll(){
|
612
|
+
|
613
|
+
Connection con = null;
|
614
|
+
|
615
|
+
List< Mutter > mutterList = new ArrayList<>();
|
616
|
+
|
617
|
+
|
618
|
+
|
619
|
+
try {
|
620
|
+
|
621
|
+
Class.forName( DRIVER_NAME );
|
622
|
+
|
623
|
+
con = DriverManager.getConnection( JDBC_URL, DB_USER, DB_PASS );
|
624
|
+
|
625
|
+
|
626
|
+
|
627
|
+
// SQLの準備
|
628
|
+
|
629
|
+
String sql = "SELECT id, name, text FROM mutter ORDER BY id DESC";
|
630
|
+
|
631
|
+
PreparedStatement pstmt = con.prepareStatement( sql );
|
632
|
+
|
633
|
+
ResultSet rs = pstmt.executeQuery();
|
634
|
+
|
635
|
+
|
636
|
+
|
637
|
+
while( rs.next() ) {
|
638
|
+
|
639
|
+
int id = rs.getInt( "id" );
|
640
|
+
|
641
|
+
String userName = rs.getString( "name" );
|
642
|
+
|
643
|
+
String text = rs.getString( "text" );
|
644
|
+
|
645
|
+
Mutter mutter = new Mutter( id, userName, text );
|
646
|
+
|
647
|
+
mutterList.add( mutter );
|
648
|
+
|
649
|
+
}
|
650
|
+
|
651
|
+
|
652
|
+
|
653
|
+
} catch ( ClassNotFoundException e ) {
|
654
|
+
|
655
|
+
e.printStackTrace();
|
656
|
+
|
657
|
+
} catch ( SQLException e ) {
|
658
|
+
|
659
|
+
e.printStackTrace();
|
660
|
+
|
661
|
+
} finally {
|
662
|
+
|
663
|
+
if( con != null ) {
|
664
|
+
|
665
|
+
try {
|
666
|
+
|
667
|
+
con.close();
|
668
|
+
|
669
|
+
|
670
|
+
|
671
|
+
} catch ( SQLException e ) {
|
672
|
+
|
673
|
+
e.printStackTrace();
|
674
|
+
|
675
|
+
}
|
676
|
+
|
677
|
+
}
|
678
|
+
|
679
|
+
}
|
680
|
+
|
681
|
+
|
682
|
+
|
683
|
+
return mutterList;
|
684
|
+
|
685
|
+
}
|
686
|
+
|
687
|
+
|
688
|
+
|
689
|
+
public boolean create( Mutter mutter ){
|
690
|
+
|
691
|
+
Connection con = null;
|
692
|
+
|
693
|
+
try {
|
694
|
+
|
695
|
+
con = DriverManager.getConnection( JDBC_URL, DB_USER, DB_PASS );
|
696
|
+
|
697
|
+
|
698
|
+
|
699
|
+
String sql = "INSERT INTO mutter( name, text ) VALUES( ?, ? )";
|
700
|
+
|
701
|
+
PreparedStatement pstmt = con.prepareStatement( sql );
|
702
|
+
|
703
|
+
pstmt.setString( 1, mutter.getUserName() );
|
704
|
+
|
705
|
+
pstmt.setString( 2, mutter.getText() );
|
706
|
+
|
707
|
+
|
708
|
+
|
709
|
+
int result = pstmt.executeUpdate();
|
710
|
+
|
711
|
+
|
712
|
+
|
713
|
+
if( result != 1 ) {
|
714
|
+
|
715
|
+
return false;
|
716
|
+
|
717
|
+
}
|
718
|
+
|
719
|
+
|
720
|
+
|
721
|
+
} catch ( SQLException e ) {
|
722
|
+
|
723
|
+
e.printStackTrace();
|
724
|
+
|
725
|
+
} finally {
|
726
|
+
|
727
|
+
if( con != null ) {
|
728
|
+
|
729
|
+
try {
|
730
|
+
|
731
|
+
con.close();
|
732
|
+
|
733
|
+
|
734
|
+
|
735
|
+
} catch ( SQLException e ) {
|
736
|
+
|
737
|
+
e.printStackTrace();
|
738
|
+
|
739
|
+
}
|
740
|
+
|
741
|
+
}
|
742
|
+
|
743
|
+
}
|
744
|
+
|
745
|
+
|
746
|
+
|
747
|
+
return true;
|
748
|
+
|
749
|
+
}
|
750
|
+
|
751
|
+
|
752
|
+
|
753
|
+
}
|
754
|
+
|
755
|
+
|
756
|
+
|
757
|
+
```
|
2
デバッグ結果追記
test
CHANGED
File without changes
|
test
CHANGED
@@ -427,3 +427,125 @@
|
|
427
427
|
コード
|
428
428
|
|
429
429
|
```
|
430
|
+
|
431
|
+
|
432
|
+
|
433
|
+
---
|
434
|
+
|
435
|
+
追記2
|
436
|
+
|
437
|
+
|
438
|
+
|
439
|
+
下記にデバッグ結果を書きます
|
440
|
+
|
441
|
+
|
442
|
+
|
443
|
+
```java
|
444
|
+
|
445
|
+
protected void doGet( HttpServletRequest request, HttpServletResponse response )
|
446
|
+
|
447
|
+
throws ServletException, IOException{
|
448
|
+
|
449
|
+
|
450
|
+
|
451
|
+
GetMutterListLogic gm = new GetMutterListLogic();
|
452
|
+
|
453
|
+
List< Mutter > mutterList = gm.execute();
|
454
|
+
|
455
|
+
request.setAttribute( "mutterList", mutterList );
|
456
|
+
|
457
|
+
// ↑ブレークポイント
|
458
|
+
|
459
|
+
}
|
460
|
+
|
461
|
+
/*
|
462
|
+
|
463
|
+
* mutterList : ArrayList<E>
|
464
|
+
|
465
|
+
* elementData : Object[0]
|
466
|
+
|
467
|
+
* modCount : 0
|
468
|
+
|
469
|
+
* size : 0
|
470
|
+
|
471
|
+
*
|
472
|
+
|
473
|
+
*/
|
474
|
+
|
475
|
+
|
476
|
+
|
477
|
+
```
|
478
|
+
|
479
|
+
|
480
|
+
|
481
|
+
```java
|
482
|
+
|
483
|
+
package test;
|
484
|
+
|
485
|
+
|
486
|
+
|
487
|
+
import java.util.List;
|
488
|
+
|
489
|
+
|
490
|
+
|
491
|
+
import model.GetMutterListLogic;
|
492
|
+
|
493
|
+
import model.Mutter;
|
494
|
+
|
495
|
+
|
496
|
+
|
497
|
+
public class Test{
|
498
|
+
|
499
|
+
|
500
|
+
|
501
|
+
public static void main( String[] args ){
|
502
|
+
|
503
|
+
GetMutterListLogic gm = new GetMutterListLogic();
|
504
|
+
|
505
|
+
List< Mutter > mutterLista = gm.execute();
|
506
|
+
|
507
|
+
|
508
|
+
|
509
|
+
for( Mutter mutter : mutterLista ) {
|
510
|
+
|
511
|
+
// ↑ブレークポイント
|
512
|
+
|
513
|
+
System.out.print( mutter.getUserName() + ":" );
|
514
|
+
|
515
|
+
System.out.println( mutter.getText() );
|
516
|
+
|
517
|
+
}
|
518
|
+
|
519
|
+
|
520
|
+
|
521
|
+
}
|
522
|
+
|
523
|
+
|
524
|
+
|
525
|
+
}
|
526
|
+
|
527
|
+
|
528
|
+
|
529
|
+
/*
|
530
|
+
|
531
|
+
*
|
532
|
+
|
533
|
+
* mutterList
|
534
|
+
|
535
|
+
* elementData : Object[10]
|
536
|
+
|
537
|
+
* modCount : 2
|
538
|
+
|
539
|
+
* size : 2
|
540
|
+
|
541
|
+
*
|
542
|
+
|
543
|
+
*/
|
544
|
+
|
545
|
+
```
|
546
|
+
|
547
|
+
|
548
|
+
|
549
|
+
|
550
|
+
|
551
|
+
こう見ると、そもそもサーブレットクラスのMain.javaで取得ができていないようですね、、。
|
1
追加情報
test
CHANGED
File without changes
|
test
CHANGED
@@ -273,3 +273,157 @@
|
|
273
273
|
|
274
274
|
|
275
275
|
```
|
276
|
+
|
277
|
+
|
278
|
+
|
279
|
+
---
|
280
|
+
|
281
|
+
追記情報です。
|
282
|
+
|
283
|
+
```java
|
284
|
+
|
285
|
+
package servlet;
|
286
|
+
|
287
|
+
|
288
|
+
|
289
|
+
import java.io.IOException;
|
290
|
+
|
291
|
+
import java.util.List;
|
292
|
+
|
293
|
+
|
294
|
+
|
295
|
+
import javax.servlet.RequestDispatcher;
|
296
|
+
|
297
|
+
import javax.servlet.ServletException;
|
298
|
+
|
299
|
+
import javax.servlet.annotation.WebServlet;
|
300
|
+
|
301
|
+
import javax.servlet.http.HttpServlet;
|
302
|
+
|
303
|
+
import javax.servlet.http.HttpServletRequest;
|
304
|
+
|
305
|
+
import javax.servlet.http.HttpServletResponse;
|
306
|
+
|
307
|
+
import javax.servlet.http.HttpSession;
|
308
|
+
|
309
|
+
|
310
|
+
|
311
|
+
import model.GetMutterListLogic;
|
312
|
+
|
313
|
+
import model.Mutter;
|
314
|
+
|
315
|
+
import model.PostMutterLogic;
|
316
|
+
|
317
|
+
import model.User;
|
318
|
+
|
319
|
+
|
320
|
+
|
321
|
+
@WebServlet( "/Main" )
|
322
|
+
|
323
|
+
public class Main extends HttpServlet{
|
324
|
+
|
325
|
+
private static final long serialVersionUID = 1L;
|
326
|
+
|
327
|
+
|
328
|
+
|
329
|
+
protected void doGet( HttpServletRequest request, HttpServletResponse response )
|
330
|
+
|
331
|
+
throws ServletException, IOException{
|
332
|
+
|
333
|
+
|
334
|
+
|
335
|
+
// DBからつぶやきリストを取得→リクエストスコープに保存
|
336
|
+
|
337
|
+
GetMutterListLogic gm = new GetMutterListLogic();
|
338
|
+
|
339
|
+
List< Mutter > mutterList = gm.execute();
|
340
|
+
|
341
|
+
request.setAttribute( "mutterList", mutterList );
|
342
|
+
|
343
|
+
|
344
|
+
|
345
|
+
// ここでセッションIDをキーにインスタンスを取得
|
346
|
+
|
347
|
+
HttpSession session = request.getSession();
|
348
|
+
|
349
|
+
User loginUser = ( User ) session.getAttribute( "loginUser" );
|
350
|
+
|
351
|
+
|
352
|
+
|
353
|
+
if( loginUser == null ) {
|
354
|
+
|
355
|
+
response.sendRedirect( "/docoTsubu/" );
|
356
|
+
|
357
|
+
} else {
|
358
|
+
|
359
|
+
RequestDispatcher dispatcher = request.getRequestDispatcher( "/WEB-INF/jsp/main.jsp" );
|
360
|
+
|
361
|
+
dispatcher.forward( request, response );
|
362
|
+
|
363
|
+
}
|
364
|
+
|
365
|
+
|
366
|
+
|
367
|
+
}
|
368
|
+
|
369
|
+
|
370
|
+
|
371
|
+
protected void doPost( HttpServletRequest request, HttpServletResponse response )
|
372
|
+
|
373
|
+
throws ServletException, IOException{
|
374
|
+
|
375
|
+
|
376
|
+
|
377
|
+
String text = request.getParameter( "text" );
|
378
|
+
|
379
|
+
|
380
|
+
|
381
|
+
if( text != null && text.length() != 0 ) {
|
382
|
+
|
383
|
+
HttpSession session = request.getSession();
|
384
|
+
|
385
|
+
User loginUser = ( User ) request.getAttribute( "loginUser" );
|
386
|
+
|
387
|
+
|
388
|
+
|
389
|
+
Mutter mutter = new Mutter( loginUser.getName(), text );
|
390
|
+
|
391
|
+
PostMutterLogic pm = new PostMutterLogic();
|
392
|
+
|
393
|
+
pm.execute( mutter );
|
394
|
+
|
395
|
+
|
396
|
+
|
397
|
+
} else {
|
398
|
+
|
399
|
+
request.setAttribute( "errorMsg", "つぶやきが入力されていません" );
|
400
|
+
|
401
|
+
}
|
402
|
+
|
403
|
+
|
404
|
+
|
405
|
+
GetMutterListLogic gm = new GetMutterListLogic();
|
406
|
+
|
407
|
+
List< Mutter > mutterList = gm.execute();
|
408
|
+
|
409
|
+
request.setAttribute( "mutterList", mutterList );
|
410
|
+
|
411
|
+
|
412
|
+
|
413
|
+
RequestDispatcher dispatcher = request.getRequestDispatcher( "/WEB-INF/jsp/main.jsp" );
|
414
|
+
|
415
|
+
dispatcher.forward( request, response );
|
416
|
+
|
417
|
+
|
418
|
+
|
419
|
+
}
|
420
|
+
|
421
|
+
|
422
|
+
|
423
|
+
}
|
424
|
+
|
425
|
+
|
426
|
+
|
427
|
+
コード
|
428
|
+
|
429
|
+
```
|